Biofilm Engineers - Blog - Let's explore wastewater by vasanth

Paneer Makes the Profit. But What Happens to the Whey? The Untold Story Behind Dairy Wastewater Treatment

Thu, 21 May 2026 10:53:52 +0000

A family of five gathers around the dinner table after a long day. The aroma of fresh paneer fills the room.

“Paneer butter masala today?” the youngest asks excitedly.

Alongside it sits paneer tikka, kadai paneer, shahi paneer, and soft paneer stuffed parathas. The family laughs, eats, and enjoys every bite.

“This is the softest paneer I’ve ever had,” says the grandfather with a smile.

The dinner ends happily. Plates are cleared. Lights go off.

But pause for a moment.

Have you ever wondered what happens inside a paneer factory after those neatly packed paneer blocks leave for supermarkets, restaurants, and homes?

For every kilogram of paneer produced, a large quantity of paneer whey is generated as residue. And while paneer brings revenue to dairy businesses, paneer whey often becomes one of the most difficult wastewater streams to manage.

This is where the real story of dairy wastewater treatment begins.

The Daily Challenge Most People Never See

Paneer whey may look harmless at first. But inside dairy factories, it can quickly become a serious operational challenge if not handled properly.

Paneer whey is highly biodegradable and contains a heavy organic load. According to treatment observations, paneer whey effluent can have:

·Inlet COD levels reaching up to 80,000 ppm

·Acidic pH around 4–5

·High protein content leading to sludge formation

At the same time, its high biodegradability also creates an opportunity for effective biological treatment when the right process is used.

For dairy factory owners and MSMEs, the problem is rarely just “wastewater.” It slowly starts affecting operations, labour, hygiene, and even brand reputation.

The Operational Pressure Behind Paneer Production

Many dairy businesses silently struggle with issues like:

Bad Odour and Fast Fermentation

Paneer whey spoils quickly when stored improperly.

·Fermentation can create strong unpleasant odours

·Nearby complaints may increase over time

·Working conditions inside the plant become uncomfortable

Drain Choking and Disposal Difficulties

The high organic nature of whey makes disposal challenging.

·Overflow and choking issues may occur

·Daily disposal becomes labour-intensive

·Transportation and handling costs keep increasing

Pollution and Compliance Concerns

Untreated or poorly treated wastewater can create environmental stress.

·Groundwater and nearby water sources may get affected

·Pollution control standards become difficult to maintain

·Frequent monitoring and corrective action may be required

Reputation and Business Impact

Today, word of mouth travels fast.

·Unhygienic surroundings can affect public perception

·Local complaints may damage trust slowly

·Operational stress starts affecting overall business focus

Paneer brings profit.

But unmanaged whey brings pressure.

And most factory owners do not want unnecessary operational burdens standing between them and business growth.

Why Traditional ETPs Sometimes Still Struggle

Many dairy factories already have some form of dairy effluent treatment plant installed.

Yet in several cases, owners continue facing recurring issues.

Not because they ignored treatment.

But because paneer whey is a highly challenging wastewater stream.

Conventional systems such as Activated Sludge Process (ASP) and MBBR systems often require:

·Continuous aeration through blowers

·Significant chemical usage

·Skilled operators for regular monitoring

·Secondary settling and sludge handling

·Higher recurring operational expenses

In many cases, factories also experience:

·Persistent odour even after treatment

·Difficulty in handling high organic loads consistently

·Rising electricity consumption

·High sludge generation

·Unsatisfactory long-term operational experience

For MSMEs especially, the challenge is not just installation.

It is sustainability.

A dairy ETP plant should not become another operational burden.

So What Exactly Is an ETP?

An Effluent Treatment Plant (ETP) is a system designed to treat industrial wastewater before discharge or reuse.

In paneer factories, ETPs help manage whey wastewater treatment by reducing pollutants, improving water quality, and supporting cleaner operations.

A good paneer factory ETP should ideally help:

·Reduce organic load effectively

·Minimize odour issues

·Lower operational complexity

·Reduce recurring costs

·Improve treatment consistency

·Support pollution control compliance

·Enable treated water reuse wherever possible

But not every ETP works the same way.

The process design matters.

A Different Approach to Paneer Whey Treatment

At Biofilm Engineers, the approach focuses on making dairy wastewater treatment simpler, cleaner, and operationally practical.

The treatment flow includes:

·Pre-treatment

·Quorum Bio-reactor

·UV/Ozone polishing

·Treated water for reuse

The system is designed to operate with:

·More than 90% operational expenditure reduction

·No chemical dependency during treatment

·Autonomous process control

·No secondary solids production

One of the biggest differences lies in the reactor design itself.

Unlike conventional submerged systems that rely heavily on artificial aeration, the Quorum Bio-reactor uses a non-submerged fixed film process with natural draft-based aeration.

This helps reduce energy dependency significantly.

Real-World Operational Observation

In a 20 KLD paneer whey ETP installation at United Valley Foods India, Sullurupet, Andhra Pradesh, the following single-pass biofilter results were observed:

Parameter	Inlet	Outlet	Removal
pH	4.31	6.71	—
BOD (mg/L)	769	138	82.1%
COD (mg/L)	3637	560	84.6%
TSS (mg/L)	156	42	73.1%

The operational cost observed was less than INR 100/day.

With a properly designed double-pass treatment approach, Pollution Control Board discharge norms can also be achieved more effectively for challenging paneer whey wastewater streams.

These results indicate how biological process optimization can reduce treatment burden while maintaining practical operational efficiency.

Why Biofilm-Based Systems Are Gaining Attention

Modern dairy wastewater treatment is gradually moving towards advanced biofilm technologies because of their higher microbial surface area and treatment efficiency.

Compared to conventional systems:

·Conventional media may provide 500–5000 m²/m³ surface area

·Advanced biofilm carriers can provide extremely high microbial growth area

·Lower diffusion resistance improves treatment efficiency

·Natural oxygen transfer reduces blower dependency

The result?

Lower energy usage. Lower sludge generation. Lower chemical dependency. Simpler operations.

For dairy MSMEs, these are not just technical advantages.

They directly affect profitability, labour management, and long-term peace of mind.

Cleaner Operations Are Becoming a Business Necessity

Today, dairy businesses are evolving quickly.

Customers expect hygiene. Authorities expect compliance. Factories expect sustainability.

And owners want systems that work quietly in the background without creating new operational headaches.

The future of paneer whey treatment is not about fear.

It is about responsible growth.

Because a successful dairy business should focus more on producing quality products — not constantly worrying about wastewater disposal every single day.

A Quiet Step Towards Better Dairy Operations

At Biofilm Engineers, the goal is simple.

To help dairy factories move towards cleaner, calmer, and more manageable wastewater treatment systems through carefully designed biological treatment solutions.

No exaggerated promises. No unnecessary complexity.

Just practical engineering focused on operational comfort, lower recurring burden, and long-term treatment stability.

Every dairy factory has its own challenges. Every wastewater stream behaves differently.

But with the right treatment approach, paneer whey does not have to remain a daily operational pressure.

Sometimes, the best industrial systems are the ones that quietly solve problems before they grow louder.

And for many dairy businesses, that quiet change can make all the difference.

Your STP Should Save Water – Not Drain Your Money: Conventional STP vs Quorum Bio-reactor Explained Simply

Wed, 20 May 2026 14:27:28 +0000

For many apartment associations, hospitals, resorts, educational institutions, and MSMEs, installing a Sewage Treatment Plant (STP) often begins with good intentions.

The goal is simple.

·Treat wastewater responsibly.

·Reuse water safely.

·Stay compliant.

·Protect the environment.

But somewhere after installation, reality starts looking very different.

·Electricity bills begin rising.

·Maintenance calls become frequent.

·Operators struggle to manage the system.

·The STP starts smelling.

·Compliance becomes uncertain.

And slowly, a system that was meant to solve a problem starts becoming one.

This is not rare.

In fact, many small and decentralised STPs below 50 KLD face these exact issues.

According to the reference data shared in the Biofilm Engineers presentation, a significant percentage of decentralised STPs do not comply with CPCB norms. Many systems are operated intermittently solely to save energy, while several facilities lack trained operators to manage them. These failures directly affect public health and urban water ecosystems.

So, the real question is not whether an STP is necessary.

The real question is:

Why do so many conventional STPs struggle to work efficiently in real-world conditions?

And more importantly, is there a simpler and more sustainable alternative?

Let’s understand this in simple terms.

WHAT IS A CONVENTIONAL STP?

A conventional STP is a sewage treatment system designed to clean wastewater using mechanical and biological treatment methods.

Common technologies include:

·SBR (Sequencing Batch Reactor)

·MBBR (Moving Bed Biofilm Reactor)

·MBR (Membrane Bio-reactor)

These systems are widely used across apartments, hospitals, resorts, industries, and commercial buildings.

On paper, they are effective.

But in smaller capacities especially below 50 KLD they often become difficult to maintain consistently.

Why?

Because most conventional STPs rely heavily on:

·Continuous aeration

·Mechanical components

·Skilled operators

·Frequent monitoring

·High energy usage

·Multiple treatment stages

When any one of these factors is neglected, performance begins to drop.

This is exactly where many facility managers and association heads start facing challenges.

WHY MOST SMALL STPS FAIL OVER TIME

Many decentralised STPs are installed with the expectation that they will “run automatically.”

But in reality, conventional systems often require constant supervision.

For example:

·If aeration is not maintained properly, treatment efficiency reduces.

·If operators are not trained, sludge handling becomes difficult.

·If systems are switched off to reduce EB bills, biological performance becomes unstable.

·If maintenance is delayed, odour and compliance issues begin appearing.

For apartments and MSMEs, hiring dedicated skilled operators full-time may not even be practical.

This creates a gap between what the STP was designed to do and what actually happens on site.

Over time, this gap becomes expensive.

THE HIDDEN COST MOST OWNERS DON’T CALCULATE

Many people compare STPs only based on installation cost.

But the actual long-term burden usually comes from:

·Electricity consumption

·Labour dependency

·AMC and maintenance

·Sludge handling

·Spare parts

·Downtime

·Compliance risks

A system that looks affordable initially can become costly every single month.

This is why operational expenditure matters more than just initial investment.

A DIFFERENT APPROACH: THE QUORUM BIO-REACTOR

To address these real-world operational challenges, Biofilm Engineers developed the Quorum Bio-reactor a non-submerged attached growth biofilm system designed especially for decentralised STPs and ETPs.

Unlike conventional systems that depend heavily on mechanical operations, the Quorum Bio-reactor works using a nature-inspired biofilm process.

In simple words, beneficial microorganisms form a mature biofilm layer on specialised filter media. This biofilm naturally treats wastewater by creating aerobic, anoxic, and anaerobic treatment zones within a single reactor structure.

This allows wastewater treatment to happen more efficiently with lower energy usage and reduced operational complexity.

The system is also designed with:

·IoT-enabled monitoring

·Plug-and-play installation

·Minimum civil work

·No chemical dependency

·Fully automatic operation

·Minimal operator intervention

Most importantly, it aims to simplify wastewater treatment for facilities that may not have dedicated skilled manpower available daily.

CONVENTIONAL STP VS QUORUM BIO-REACTOR: A SIMPLE COMPARISON

Let’s simplify the comparison for a typical 50 KLD application.

1. Energy Consumption

Conventional technologies like MBBR and MBR can consume significantly higher electricity due to continuous aeration and mechanical operation.

The reference comparison shows:

·SBR: 35 kWhr/day

·MBBR: 100 kWhr/day

·MBR: 200 kWhr/day

·Quorum Bio-reactor: 10 kWhr/day

For apartment associations and MSMEs, this difference can directly affect monthly EB bills.

2. Operational Cost

Operational cost is where many organizations experience the biggest relief.

Monthly operating cost comparison for 50 KLD:

·SBR: Approximately ₹57,000/month

·MBBR: Approximately ₹22,000/month

·MBR: Approximately ₹83,000/month

·Quorum Bio-reactor: Approximately ₹3,000/month

For organisations running year after year, this difference becomes substantial.

3. Labour Requirement

Conventional systems often depend on trained operators.

The Quorum Bio-reactor is designed for autonomous process control and lower manual intervention, reducing labour dependency significantly.

This becomes highly valuable for:

·Residential apartments

·Resorts

·Schools

·Community toilets

·Small industries

·Rural or semi-urban projects

4. Sludge and Secondary Treatment

Many conventional STPs generate secondary sludge and may require additional settling or filtration steps.

The Quorum system minimizes these requirements, reducing complexity and maintenance burden.

5. Land Footprint

Space is becoming increasingly valuable.

Compared to several conventional systems, the Quorum Bio-reactor operates with a relatively compact footprint while maintaining efficient treatment performance.

Real-World Performance Matters

Technology discussions are meaningful only when supported by real-world operation.

In the reference projects:

A 20 KLD STP at a community toilet facility in Chikkaballapur, Karnataka reportedly achieved:

·91.6% BOD removal

·75.6% COD removal

·88.7% TSS removal

with an operational cost of approximately ₹50/day.

Similarly, a 10 KLD STP under the AMRUT project for Madurai Corporation operated at approximately ₹10/day while achieving strong nutrient removal performance.

These examples highlight an important point.

Wastewater treatment does not always have to be energy-heavy, manpower-heavy, and stressful.

With the right process design, it can become simpler, quieter, and more sustainable.

WHY THIS MATTERS MORE THAN EVER

Today, water reuse and wastewater compliance are no longer optional topics.

Apartment associations are under increasing pressure to manage water responsibly.

Hospitals require reliable treatment systems for hygiene and compliance.

Resorts need silent and odour-free operations to protect guest experience.

MSMEs want operational efficiency without adding another complicated system to manage.

At the same time, nobody wants:

·Constant complaints

·Rising maintenance costs

·Unexpected shutdowns

·Expensive operators

·Non-compliance risks

This is why the future of decentralized wastewater treatment is gradually shifting toward simpler, more autonomous, and nature-inspired systems.

Not because conventional technologies are “bad,” but because real-world operating conditions demand smarter practicality.

A MORE PEACEFUL WAY FORWARD

An STP should quietly do its job in the background.

It should not become a daily operational headache.

The ideal system is not the one with the most complicated machinery.

The ideal system is the one that consistently works, consumes less energy, requires less intervention, and gives long-term peace of mind.

That is exactly why many organisations today are beginning to rethink how wastewater treatment should actually function in decentralised environments.

LOOKING FOR A SMARTER STP SOLUTION?

At Biofilm Engineers, we believe wastewater treatment should be practical, sustainable, and stress-free.

Our Quorum Bio-reactor systems are designed to help apartments, hospitals, resorts, institutions, and MSMEs reduce operational burden while improving treatment efficiency.

Whether you are planning a new STP, upgrading an existing one, or struggling with high operational costs, our team is here to guide you with the right solution.

Book a consultation with our experts and explore how a simpler, nature-inspired approach can help your organisation save energy, reduce maintenance stress, and operate with greater confidence for years ahead.

The Silent STP Revolution: The Hidden Apartment Problem Costing Families Peace & Property Value

Thu, 14 May 2026 15:53:55 +0000

“We Bought Our Dream Flat… But the STP Noise Made Us Leave” Why Silent STPs Are Becoming a Necessity, not a Luxury

WE BOUGHT OUR DREAM FLAT… BUT THE STP NOISE MADE US LEAVE

People usually check everything before buying a flat.

The ventilation.

The parking space.

The water supply.

The gym.

The tiles.

The view from the balcony.

But almost nobody asks one important question:

“How does the STP sound?”

And sometimes, that one question changes everything.

THE DREAM THEY BUILT FOR YEARS

It was a family of four.

A father and mother who worked tirelessly for years, carrying one dream quietly in their hearts to buy a home of their own.

They planned every rupee carefully.

Weekend outings became savings.

Luxury purchases became fixed deposits.

Every sacrifice slowly turned into hope.

And finally, one day, they bought the flat they had dreamed about for years.

A beautiful apartment.

A good neighbourhood.

Safe surroundings for their children.

A place they proudly called home.

For the first few days, happiness filled every corner of the house.

Then came the sound.

A constant mechanical humming.

Blowers are running endlessly.

Vibrations through the walls.

An unpleasant odour drifts occasionally through the balcony.

The apartment’s STP was located close to their flat.

At first, they tried to ignore it.

“Maybe we’ll get used to it.”

But peace slowly began disappearing in ways they never expected.

Windows stayed closed longer.

Balcony conversations became shorter.

Late nights felt restless.

Guests started noticing the smell before they did.

The painful part?

They had planned for EMI, maintenance, school fees, and savings.

But never planned for noise.

Months passed, trying to adjust.

But eventually, exhaustion replaced excitement.

The home they worked years to buy no longer felt peaceful.

And sadly, stories like this aren’t rare anymore.

THE HIDDEN INFRASTRUCTURE PROBLEM NOBODY TALKS ABOUT

Most organisations install STPs for one reason:

Compliance.

But residents experience them differently.

For the people living around them, a badly designed STP can become:

·a constant source of disturbance,

·an odour complaint generator,

·an operational headache,

·and sometimes even a silent reason behind tenant dissatisfaction.

The loudest thing in some apartments today is not traffic.

It is the infrastructure meant to stay unnoticed.

And that is where modern infrastructure thinking must change.

Because, a treatment plant should clean water, not disturb lives.

HOW TO GET RID OF THE NOISY STP PROBLEM

The solution is not avoiding sewage treatment.

But!

The solution is to build sewage treatment differently.

Modern residential and commercial spaces are no longer judged only by appearance. People now care deeply about:

·peace,

·wellness,

·silent surroundings,

·odour-free environments,

·and operational comfort.

This is exactly why Silent STPs are becoming essential in modern developments.

Not as a luxury.

But as responsible infrastructure.

NOW WHAT IS A SILENT STP?

A Silent STP is an advanced sewage treatment system designed to operate with:

·minimal noise,

·very low vibration,

·reduced odour generation,

·lower energy consumption,

·and easier maintenance.

Unlike conventional systems that depend heavily on loud blowers and mechanically intensive operation, Silent STPs focus on smarter process engineering and efficient biological treatment methods.

THE RESULT?

A sewage treatment system that performs effectively without constantly reminding people that it exists.

That is how infrastructure should feel: quiet, efficient, and almost invisible.

WHY SILENT STPS ARE BECOMING ESSENTIAL?

1. Peace Has Become a Real Amenity

Today, people are not just buying square feet.

They are buying comfort.

A noisy STP affects:

·resident satisfaction,

·sleep quality,

·surrounding ambience,

·and even perception of the property itself.

Silence is no longer a luxury feature.

It is part of modern living.

2. Odour Complaints Can Damage Reputation

One unpleasant smell can change how people feel about an entire property.

·Residents complain.

·Visitors notice.

·Tenants hesitate.

·Online reviews suffer.

An odour-free STP helps maintain:

·cleaner surroundings,

·healthier environments,

·and better overall resident experience.

The best STP is often the one people barely notice.

3. Poorly Designed STPs Quietly Waste Money

A badly designed STP not only consume electricity,

It silently consumes:

·maintenance budgets,

·operational time,

·resident goodwill,

·and long-term efficiency.

Modern Silent STPs are designed to reduce:

·unnecessary power consumption,

·excessive sludge generation,

·and high mechanical dependency.

That means lower operational costs and better long-term savings.

What once felt like a mandatory expense can become a smarter operational asset.

4. Less Mechanical Stress Means Easier Maintenance

Traditional STPs often involve:

·continuous blower operation,

·multiple moving components,

·frequent maintenance,

·and higher operator dependency.

Silent STPs are typically designed with:

·simplified operation,

·lower mechanical complexity,

·fewer disturbances,

·and more stable treatment performance.

For facility management teams, this means:

·fewer complaints,

·easier operation,

·lower maintenance stress,

·and better reliability.

How Can a Silent STP Be Installed?

The good news is that organisations do not always need to rebuild everything from scratch.

·Silent STP concepts can be:

·integrated into new projects,

·retrofitted into existing systems,

·or upgraded from old noisy plants.

The transformation usually involves:

·smarter aeration design,

·efficient biological treatment,

·odour management systems,

·energy-efficient equipment,

·acoustic optimisation,

·and nature-inspired process engineering.

The goal is simple:

Treat wastewater effectively while protecting the comfort of the people living around it.

The Future of Wastewater Treatment Is Silent

Modern infrastructure is evolving.

People no longer accept unnecessary noise, unpleasant odours, or stressful utility spaces as “normal.”

Apartments, hotels, institutions, industries, and commercial spaces are now expected to provide not just functionality but comfort.

And the future belongs to systems designed around human experience.

No family should regret buying a home because of infrastructure discomfort.

And no organisation should lose reputation because its treatment system has become a daily disturbance.

A treatment plant should work silently in the background protecting both the environment and the peace of the people around it.

That is the real purpose of a Silent STP.

If your STP is being noticed every single day for its noise, smell, or maintenance problems, it may already be failing its purpose.

At Biofilm Engineers Pvt Ltd, we design advanced, silent and nature-based STP solutions that are:

·low-noise,

·odour-free,

·energy-efficient,

·easy to maintain,

·and built for modern living environments.

From apartments and hotels to institutions and industrial facilities, we help organisations move toward quieter, cleaner, and more sustainable wastewater treatment systems.

Because modern infrastructure should support peaceful living, not disturb it.

Are You Losing Money Through Wastewater Without Realising It?

Fri, 01 May 2026 08:53:57 +0000

THE WATER YOU IGNORE TODAY MIGHT BE COSTING YOU MORE THAN YOU THINK

It starts like any normal day.

Water flows through your facility.

Used. Drained. Forgotten.

No one stops to think about it.

Not in offices.

Not in hospitals.

Not in apartments.

Not even in factories where water runs all day.

Because once it disappears into the drain, it feels like the job is done.

But is it?

THE INVISIBLE LOSS NO ONE TALKS ABOUT

Every day, businesses generate wastewater.

And every day, most of it, is simply discharged – without a second thought.

But here’s what often goes unnoticed:

·You’re paying for fresh water

·You’re disposing of used water

·And you’re losing the chance to reuse it

That’s not just waste.

That’s “money flowing out silently”.

“IT’S JUST WATER” – UNTIL IT BECOMES A PROBLEM

For many company owners, wastewater feels like a minor operational detail.

Something that can be handled later.

But over time, small neglect turns into bigger issues:

·Rising water bills

·Increased tanker dependency

·Drain blockages and foul odor

·Complaints from the surroundings

·Difficulty in managing disposal

And then comes the bigger question:

·“Will this become a compliance issue later?”

The answer, most of the time, is a “yes”.

HERE IS WHERE SEWAGE TREATMENT PLANTS COME IN

This is where a Sewage Treatment Plant (STP) quietly changes everything.

Not just in one place–but across multiple environments:

·Apartments managing daily household water

·Hospitals handling sensitive wastewater

·Offices maintaining hygiene standards

·Hotels ensuring smooth operations

·Educational institutions managing large-scale usage

And yes! In industries too.

Anywhere water is used, wastewater is created.

And anywhere wastewater exists, treatment becomes essential.

WHAT ACTUALLY HAPPENS INSIDE AN STP?

Let’s keep it simple.

A sewage treatment plant doesn’t “remove wastewater.”

It cleans it.

Step by step:

·Solid waste is separated

·Organic matter is broken down using natural processes

·Impurities are filtered out

·Clean water is restored

What you get at the end is not waste.

It’s reusable water.

WHAT HAPPENS IF YOU IGNORE IT?

Ignoring wastewater treatment doesn’t stop the problem.

It quietly grows.

·Water expenses keep increasing

·Disposal becomes harder to manage

·Systems face wear and tear

·Operational inefficiencies build up

·Compliance risks slowly rise

And the biggest loss?

You continue to pay for something you could have reused.

WHAT CAN YOU ACTUALLY SAVE?

This is where most businesses have an “aha” moment.

A properly managed sewage treatment system can help you:

·Reduce freshwater consumption

·Cut down water procurement costs

·Reuse water for landscaping, flushing, and gardening

·Improve operational efficiency

·Maintain cleaner surroundings

·Stay aligned with environmental norms

In simple terms:

Less waste. More control. Better savings.

WHY THIS MATTERS MORE TODAY

Water is no longer an unlimited resource.

And regulations are becoming stricter – not to burden businesses, but to protect long-term sustainability.

In India, pollution control boards increasingly emphasise:

·Proper wastewater treatment

·Safe disposal practices

·Reduced environmental impact

Ignoring this today may not feel urgent.

But tomorrow, it might not be optional.

A SMARTER WAY TO LOOK AT IT

Instead of seeing wastewater as a problem, shift the perspective:

·It’s a resource waiting to be reused

·It’s a cost that can be controlled

·It’s a system that can work for you–not against you

This is not just about compliance.

This is about running a smarter business.

WHERE YOU STAND TODAY

If wastewater hasn’t grabbed much of your attention yet, you’re not alone.

Most businesses start there.

But the ones that move early gain the advantage:

·Better cost management

·Smoother operations

·Future-ready systems

A THOUGHT BEFORE YOU MOVE ON

Every drop of water that leaves your facility has a story.

Right now, that story ends in waste.

But it doesn’t have to.

Understanding wastewater is the first step.

Managing it the right way is what creates real impact.

If you’ve never evaluated how much water your business is losing – or how much you could actually save – this might be the right time to look into it.

Because what seems like a small operational detail today, could become a major efficiency advantage tomorrow.

And when you decide to take that step, you don’t have to figure it out alone.

We’re here to support you with the right systems, right guidance, and right solutions so you can save resources, reduce costs, and run cleaner, smarter operations.

You focus on your business.

We’ll have your back when it comes to managing your water better.

On Enhanced biological phosphorus removal

Mon, 20 Jun 2022 07:01:30 +0000

Phosphorus accumulating organisms [PAOs] think different.

They are not interested in crowd formation like organic heterotrophs. They know their niche. They know where their space is. They know themselves.

Say, I’m a bacterium. I’m introduced to a new space/vast land with abundant resources for growth. The first strategy that comes to my mind is “I have to grow faster than others” [like our modern startups think]. They spend all their resources to outcompete their competitors. And at the end of the day, some do succeed. These are our typical ordinary organic heterotrophs that take organic carbon from the environment. They can double in 4 hours. And occupies most of the space available to them. Sounds great!

But there’s this bacterium [the PAOs] that says, I’m not going to be an “ordinary heterotroph”. Fast-growing at the expense of resources, for me, is a primitive strategy. I know my niche. Let me do it my way.

PAOs have a unique niche. It takes up organic carbon (in the form of volatile fatty acids) during the anaerobic period and stores it as polyhydroxyalkanoates [PHAs], by breaking down the polyphosphate [PP] polymers and glycogen reserves. While, during the aerobic period, it takes up the orthophosphate (PO₄) in the water, at the expense of breaking the PHA. By doing this, it replenishes its glycogen and PP reserves. Indeed, think different.

Hope our modern-age bootstrapped startups learn from PAOs, the lesson to thrive in a competitive environment.

P.S. I have written my Master's thesis based on EBPR. You may have a look.

https://odr.chalmers.se/bitstream/20.500.12380/301670/1/ACEX60%2C Ramesh Vasanth.pdf

Waste sludge in wastewater treatment

Sun, 19 Jun 2022 08:46:07 +0000

Organic carbon + Oxygen CO₂ + H₂O + New bacterial cells

In aerobic biological oxidation of carbon, the organic carbon in the wastewater is converted to carbon dioxide. The reaction also results in the production of new bacterial cells. Maintaining an optimal volume of bacterial cells in the bioreactor is important. If the number of bacterial cells is low, then the kinetics of the reaction is also low. When the bacterial cells are too high, as the bioreactor space is limited they will overflow from the bioreactor. Hence, there must be a mechanism to remove excess bacterial cells (sludge) from the bioreactor.

In suspended growth processes, the removal of excess sludge is quite straightforward. The excess sludge is removed from the secondary settler as shown in the figure below. The excess sludge is mentioned as Waste activated sludge (WAS). WAS is further directed for sludge treatment, for instance, by anaerobic digestion.

The picture shows a typical layout of an activated sludge plant. The excess secondary sludge goes through a suitable sludge treatment.

Credits: Prof. Britt-Marie Wilen, Chalmers University of Technology, Sweden.

In attached growth processes, especially in trickling filters, the removal of excess sludge is quite uncontrolled. It’s called sloughing off. Once, the biofilm matures, the pressure from the water flow triggers sloughing off parts of the biofilm or even the entire biofilm from the trickling filter.

In any bioreactor removing the excess bacterial cells is essential. So the question is how do we do it in our biofilter?

EBR is a fixed film process (attached growth). The microbes attach to the packing media to form biofilms. The packing media in our biofilter fills the entire reactor (say it’s filled with sand-like particles). Then the conventional sloughing off that occurs in a trickling filter cannot be expected. As the spacing within the packing media particles is practically negligible for the sloughing off process. But still, the excess biofilms must be removed or it’s going to clog the biofilter. Here comes the metazoan (earthworms). We use earthworms to predate the excess biofilms. It maintains an optimal amount of biofilms in the bioreactor. Hence, there’s no production of waste sludge that must be disposed of or further treated as in the case of the activated sludge process.

Conventional nitrogen removal pathway in wastewater treatment

Sun, 19 Jun 2022 08:43:14 +0000

The Nitrogen cycle

We know that the biological removal of ammonium from wastewater needs two distinct conventional steps:

1. Nitrification (Aerobic conditions) – Ammonium to Nitrite to Nitrate.

2. Denitrification (Anoxic conditions) – Nitrate to Nitrogen gas.

From the above points, we can see that we need two distinct redox conditions for complete biological nitrogen removal. We could do that in a single reactor due to mass transfer limitations induced in the biofilms.

The biofilm architecture in the EBR reactor allows a diverse community of Bacteria, Archaea, and fungus to co-exist in a single place. The mass transport limitations of electron acceptor (i.e. oxygen) and electron donor (carbon) allow for simultaneous nitrification and denitrification in a single reactor.

For instance, the following figure depicts the mass transfer limitations in a membrane bioreactor. The outer layer is aerobic and the inner layer is anoxic. A similar phenomenon can be observed in EBR. The microbes attach to the packing media to form biofilms. The packing media also acts as a carbon source (electron donor). The ammonium gets converted to Nitrate in the aerobic layers, i.e. the outer layer of the biofilm which is exposed to the atmosphere. The nitrate diffuses into the inner layers of the biofilms. But oxygen is absent due to diffusion limitations. The oxygen would have been consumed by the heterotrophs, nitrifying and other microbial communities before it reaches the inner layers of the biofilm. Hence, the inner layer has nitrate (electron acceptor) and carbon (electron donor) and a denitrification reaction take place.

Credits:

Credits: Prof. Oskar Modin, Chalmers University of Technology, Sweden.

P.S. What causes the mass transfer/diffusion limitations within a biofilm?

It’s simply the difference in the rate of diffusion of the substrate and the rate of substrate consumption by the microbes.

For instance, in the state of the art wastewater treatment technology aerobic granular sludge. Typically the outer layers are dominated by heterotrophs. Heterotrophs consumes organic matter/carbon in the wastewater for their metabolism. It uses oxygen as an electron acceptor for breaking down carbon. The growth rate of the heterotrophs is highest and dominates the outer layers of the granules rapidly. It consumes all the available oxygen before the oxygen molecule enters the inner layers. Hence, the inner layer becomes devoid of oxygen. The inner layers become anoxic if nitrate is present, and completely anaerobic at the inner core. The figure below shows a typical granule structure.

A typical aerobic granule structure is shown. The outer layer is aerobic. The oxygen (substrate) gets consumed by the heterotrophs (for organic carbon oxidation), and autotrophs (for nitrification) in the outer aerobic layers. The end product of the two-step nitrification process is Nitrate and it diffuses into the inner layers. The inner layers which are devoid of oxygen become anoxic due to the presence of nitrate. Once, the nitrate is also consumed by the microbes for denitrification, the inner core becomes anaerobic. i.e. absence of electron acceptor (oxygen and nitrate).

Why Anammox?

Sun, 19 Jun 2022 08:29:08 +0000

The following paragraphs are an excerpt from the breakthrough paper “Anaerobic ammonium oxidation discovered in a denitrifying fluidized bed reactor”.
Before Anammox - the problem:
Nitrogen removal from wastewater is critical for safeguarding sensitive water bodies. Nitrogen is often a rate-limiting compound for algae growth in surface water bodies. Nitrogen in wastewater when discharged into a water body, it makes it eutrophic. Eutrophication further leads to algae blooms.
Conventional biological nitrogen removal is a two-step process as discussed in FAQ-8. The first step is nitrification and the second step is the denitrification process. Nitrification in itself is often observed as a two-step process. The first step involves the conversion of ammonium into nitrite by ammonia-oxidizing bacteria/archaea. While the second step involves the conversion of nitrite to nitrate by nitrite-oxidizing bacteria. The first step of nitrification is a bottleneck, as the ammonium oxidizers are slow-growing autotrophs. And they compete with fast-growing heterotrophs for oxygen (electron acceptor). The denitrification process involves the conversion of produced nitrate to nitrogen gas. The bottleneck with the denitrification process is that it requires a carbon source (electron donor) and must be supplied. Nitrification and denitrification require different redox conditions i.e. aerobic and anoxic respectively. In wastewater treatment plants, separate chambers are required for each of these processes and the wastewater is cyclically pumped through these chambers.
Summary of the problems with conventional nitrification-denitrification:
1. High requirement of oxygen for nitrification reaction.
2. Requirement of carbon for denitrification reaction.
3. Needs a lot of space for constructing separate chambers and involves intensive pumping operations.
Anammox the discovery:
In 1977, Ernest Broda stated, “Two kinds of litotrophs are missing in nature”.
He hypothesized that it must be possible to oxidize ammonium anaerobically with nitrite/nitrate as it’s thermodynamically feasible:
NH₄⁺ + NO₂^- N₂ + 2H₂O ΔG = -358 kJ/mol NH₄⁺
Anammox (anaerobic ammonium oxidation) remained only in theory until a team of Dutch engineers and researchers observed an unusual pattern in their denitrifying fluidized bed reactor. The figure below shows the ammonium concentration in the influent. All was normal till day 420. From day 420, they started observing a significant “disappearance” of ammonium in the denitrifying reactor. The observation leads to the discovery of anammox. Now we know that anammox accounts for over 50% of nitrogen turnover in marine environments, forming a critical component of the global biogeochemical cycle.

Advantages of the Anammox process:
1. Lower energy consumption – as the aeration required is reduced.
2. No external carbon is required.
3. Lower footprint. Complete nitrogen removal can be performed in a single bioreactor.

Credits: To my Guru, Prof. Frank Persson, Chalmers University of Technology, Sweden.

Activated sludge - an history in itself

Wed, 27 Jan 2021 03:03:45 +0000

Most stories start with once upon a time, ours do the same,

Dr. Down, Chemist of the Massachusetts State Board of Health, after a series of experiments concluded with confidence that rigorous agitation of air does not contribute to sewage purification. Maaon and Hine asserted aeration had negligible effect on sewage treatment. Fowler in 1897, recorded, aeration results in "no tangible oxidation". Indeed It was the time when literature and investigations suggested that aeration of sewage as per se is not a viable adjunct in wastewater treatment.

Though there were some hopes and advances in using aeration in some form or the another as,

For instance, Black and Phelps in order to deal with pollution in New York harbour, performed experiments with raw and partially septicized sewage and convinced that at certain conditions, aerating the sewage can remove readily degradable organic matter.

While, Clark and Gage suggested that aeration can be used as primary treatment before filtration. They found that aeration of sewage for 24 hours reduced the free and albuminoid nitrogen to some extent. Use of aerated sewage with green growth, Protococcus and Scenetesmus, contributed to significant nitrification within 24 hours.

Still there was nothing solid when it comes to aeration of sewage.

The moment of observation

Dr. Fowler after his visit to the prestigious Lawrence Experiment Station, Massachusetts, in November 1912, mentioned about observing strands of algae growth in the bottle in which sewage was aerated. And upon suggestion by Dr. Fowler that "research can be conducted on these lines", series of experiments were performed by Ardern and Lockett, which changes the course of how wastewater treatment was performed forever.

What I felt great about reading this paper?

Preliminary experiments - 5 weeks to 24 hours

80 oz. Manchester sewage samples were taken and aerated until complete nitrification occurred. Ordinary filter pumps were used for aerating the sewage.

First complete nitrification of the sample took 5 weeks time (It's astounding that for my bioreactor it took the same time to observe significant nitrification).

After the settlement of formed solids, the clear influent was decanted, and raw sewage was reintroduced. The process continued, and it was discovered that the amount of solids deposited increased with time. Interestingly, the time required for complete nitrification decreased as a result, and the complete nitrification was happening within 24 hours.

In the impossibility of searching a different term, the accumulated solids were named as "activated sludge".

The striking observations from the preliminary experiments were

Alkalinity is a crucial requirement and they even added small quantity of external alkali to perform nitrification reaction. They recognized that alkalinity is required to neutralize the nitric acid produced during the nitrification reaction.

(When I was doing my master thesis with aerobic granular sludge, I was performing nitrification experiment without adding sufficient alkali, and the consequence was nitrification was extremely erratic and I came back from lab wondering what went wrong. I came back and read Metcalf & eddy and realized that I was not adding sufficient alkali. Next time, I was doing it in the right way and the experiment went well. So, I can say with confidence from my personal experience that reading ancient papers can be helpful for amateur researchers at least and it's a way of acknowledging their contribution, and a way of remembering them).

2. Intimate contact between activated sludge and sewage is important (The paper had tables to prove this point, I'm not sharing that here).

The paper had observations made from a series of experiments, for instance, the effect of temperature, maintenance of sludge activity, so on and so-forth which I'm not adding it here and the reader can refer if to the original article as the link is embedded.

One question remains, what scientists and engineers at that time felt after reading/knowing this paper by Ardern and Lockett?

The discussions part in the paper answers the question, it was interesting to read but hard to summarize, so I again leave it to the readers to go through that part.

https://onlinelibrary.wiley.com/doi/abs/10.1002/jctb.5000331005

What does a coventional STP in India do?

Thu, 14 Jan 2021 09:43:28 +0000

The primary reason for treating our sewage/wastewater is to remove the organic carbon constituents from the wastewater. Why is it important to do that?

The heterotrophic microbes present in surface water bodies like lakes and rivers can use this organic carbon for their primary metabolism. The organic carbon compounds act as electron donors, while the oxygen dissolved in the water is taken up as an electron acceptor. As the microbes take up dissolved oxygen, it depletes the oxygen levels in the water body (Biological Oxygen Demand). The drop/absence of dissolved oxygen causes an unavailability of oxygen for fishes and other aerobic fauna in the water body.

So how do we solve this problem in a typical wastewater treatment plant?

We mimic the process that happens in the water body, in a wastewater treatment plant.

The bioreactor has a rich and diverse microbial community which can degrade the organic carbon and oxygen is introduced into the bioreactors using mechanical aerators. Thus the effluent from the treatment is safe to be discharged into a nearby water body.

Wait, we 're not over there yet!!

In similar fashion, the nitrogen and phosphorus (requires aerobic and anaerobic treatment steps) are removed stringently followed in the Western countries. This stops eutrophication of water bodies and prevents algal bloom events.

I got you and you were right, removal of phosphorus also can stop foaming of Bellandur lakes!