Wastewater Expert

Makes – Leading wastewater expert focused on efficient water treatment

What is wastewater: Water that has been used by people in homes, businesses, industries, or from rain runoff and has become polluted. It may contain dirt, chemicals, sewage, or other contaminants, making it unsuitable for direct use without proper treatment.

What is MAKES

MAKES stands for Muhammad Ameen Keryo Environmental Services, an SECP-registered environmental company in Pakistan. The company works on practical and nature-based solutions for wastewater treatment, sanitation, wetlands, biogas, solid waste management, water conservation, and environmental protection.

Led by Muhammad Ameen Keryo, a respected wastewater expert known for developing many constructed wetland systems in Pakistan, MAKES promotes simple, affordable, and sustainable treatment methods. Its approach uses natural processes, where plants, gravel, soil, and helpful bacteria clean wastewater with low energy and low maintenance.

MAKES has worked with the Pakistan Navy and several other government and non-government organizations. Its services include consultancy, project design, construction support, supervision, monitoring, training, and capacity building.

The main goal of MAKES is to reduce pollution, protect public health, save freshwater, and support cleaner communities through field-based experience, technical knowledge, and eco-friendly environmental solutions.

It brings reliable, locally suitable treatment options for both rural and urban needs.

What is wastewater

Wastewater is the dirty water that comes after people use clean water in daily life. It comes from toilets, kitchens, bathrooms, washing machines, hospitals, farms, markets, and industries. This water may look simple, but as a wastewater expert would explain, it can contain soap, food particles, oil, human waste, chemicals, and germs that can harm people and nature.

Experts like Muhammad Ameen Keryo in Pakistan have shown that wastewater is not only a problem; it can also become a useful resource when treated properly. He is known for promoting biological wastewater treatment through constructed wetlands, also called reed bed systems. Sources linked to his work describe him as a pioneer of Pakistan’s first constructed wetland system, with over 200 constructed wetland units implemented across the country. (Sindhica Reforms Society)

In a constructed wetland, wastewater passes through gravel, sand, plants, and helpful bacteria. These natural elements clean the water step by step, with less smell, low energy use, and lower cost than many mechanical systems.

In simple words, wastewater is used water that needs careful treatment. If we manage it wisely, it protects rivers, reduces disease, saves freshwater, and supports a cleaner environment for communities, farms, and future generations.

How Wastewater Treatment Works: From Sewage to Clean Water

Most of us do not like to think about what happens after we flush the toilet or drain water from the sink. It is not exactly a pleasant topic. But behind this everyday action is a huge part of civil engineering, public health, and city infrastructure.

Every day, wastewater from homes, offices, restaurants, and industries travels through underground sewer systems and reaches wastewater treatment plants. These plants take dirty water and clean it through a carefully designed process so it can safely return to the environment or, in some cases, be treated further for reuse.

Why Wastewater Treatment Matters

Wastewater treatment is one of the most important systems that keeps modern cities safe and healthy. Without it, sewage would flow directly into rivers, lakes, and streets, creating serious health and environmental problems.

In large cities, the amount of wastewater is massive. A single toilet flush may not seem important, but when millions of people flush, shower, wash dishes, and do laundry every day, the total flow becomes enormous.

Wastewater treatment plants are built to handle this flow safely. Their job is to remove trash, sand, solids, organic waste, bacteria, and harmful organisms before the water is released back into nature.

Where the Process Begins

The journey starts when wastewater enters a treatment plant through large sewer pipes. At this point, the water is not just liquid waste. It may also contain wipes, plastic, toys, wood pieces, sand, rocks, grease, and many other unwanted items.

Because of this, the first stage of treatment focuses on removing large objects and making the wastewater easier to process.

Pretreatment: Removing Large Waste

Pretreatment is the first major step in a wastewater treatment plant. Its main purpose is to remove large materials that could damage pumps, pipes, and machines later in the process.

Bar Screens

Bar screens are large metal bars placed at the entrance of the treatment plant. They act like a filter for big objects.

Items such as wipes, plastics, wood, toys, and other trash get trapped by these screens. This prevents them from entering the plant’s equipment and causing blockages or damage.

Many modern plants use mechanical rakes to clean the bar screens automatically. Older plants may still use manual cleaning methods. Once removed, the collected waste is usually sent to a landfill or solid waste facility.

Grit Chambers

After large objects are removed, wastewater moves into grit chambers. These chambers remove heavier particles like sand, gravel, and small stones.

This step is important because grit cannot easily be removed by chemicals. If left in the water, it can wear down pumps, clog pipes, and damage machinery.

In grit chambers, the flow speed of the wastewater is carefully controlled. This allows heavier particles to settle at the bottom while the water continues moving forward.

There are different types of grit chambers, including horizontal grit chambers, aerated grit chambers, and vortex grit chambers. They work in slightly different ways, but their goal is the same: remove heavy particles from the wastewater.

Primary Treatment: Settling Out Solids

After pretreatment, the wastewater moves into the primary treatment stage. This stage mainly removes solids that can settle out of the water.

Primary Clarifiers

The main structure used in this step is called a primary clarifier. It is a large basin where wastewater slows down, giving solid particles time to sink to the bottom.

This process works because of settling velocity, which means the speed at which particles fall through water. Engineers design clarifiers so the water moves slowly enough for solids to settle properly.

The heavy material that sinks to the bottom becomes sludge. Lighter materials may float to the top and are also removed.

After this step, the partially treated water is called effluent. It is cleaner than before, but it still contains dissolved organic matter and microorganisms. That is why it must go through more treatment.

Secondary Treatment: Breaking Down Organic Waste

Secondary treatment focuses on removing biological and organic material from the water. This is one of the most important stages in the entire process.

Aeration Basins

In many treatment plants, the effluent flows into aeration basins. These are large tanks filled with air bubbles.

Air is pumped into the water to provide oxygen. At the same time, bacteria are added or returned from earlier treatment stages. These bacteria feed on organic waste in the water.

This process is known as aerobic digestion. In simple words, bacteria use oxygen to break down the organic matter in wastewater.

The oxygen helps the bacteria stay active and do their job more efficiently. Over time, much of the waste is broken down and removed from the water.

Return Activated Sludge

Some of the bacteria-rich sludge is sent back into the aeration basin. This is called return activated sludge.

This step helps keep enough useful bacteria in the system so the treatment process continues working properly. These bacteria are like tiny workers that help clean the water naturally.

Trickling Filters

Some older wastewater treatment plants also use trickling filters. In this system, water flows over stones, plastic, or another surface where bacteria grow.

As the water passes over this surface, the bacteria break down organic material. Although this method is older, many plants still use it because it can support the treatment process.

Secondary Clarifiers: Separating Water and Sludge

After aeration, the water and sludge mixture moves into secondary clarifiers. These tanks allow the remaining sludge to settle out.

Some of this sludge is sent back to the aeration basins as return activated sludge. The rest is removed for further handling.

At this stage, most of the organic matter has been removed. The water is much cleaner, but it still needs one final step before it can safely return to the environment.

Disinfection: Killing Harmful Microorganisms

Disinfection is the final major treatment step. Its purpose is to remove or deactivate harmful bacteria, viruses, and other microorganisms.

There are three common methods used for disinfection.

Chlorine Disinfection

Chlorine is one of the most widely used methods. It works by chemically killing bacteria and other harmful organisms in the water.

However, chlorine must be carefully controlled. If too much remains in the water, it can harm fish, plants, and other life in rivers or lakes. Because of this, chlorine is often removed or reduced before the water is released.

Ozone Disinfection

Ozone disinfection uses ozone gas to destroy microorganisms. Ozone is a strong oxidizing agent, which means it can damage the cell walls of bacteria and kill them quickly.

This method is powerful and effective, but it can be more expensive and requires special equipment.

Ultraviolet Light Disinfection

Ultraviolet, or UV, disinfection uses special light to damage the DNA of microorganisms. This stops bacteria and viruses from reproducing.

UV treatment does not always kill organisms directly, but it makes them harmless because they can no longer multiply and cause disease.

Effluent Release: Returning Water to Nature

After disinfection, the treated water is ready for release. In most cases, it is discharged into a river, lake, stream, or another water source.

This treated water is much safer than raw sewage and must meet strict quality standards before it leaves the plant.

In some areas where water is limited, treated wastewater may go through additional treatment so it can be reused. This is sometimes called full-cycle water reuse. With advanced treatment, water can become clean enough for drinking, although many people feel uncomfortable with the idea because the water was recently sewage.

How Long Does Wastewater Treatment Take?

The full wastewater treatment process usually takes about 24 to 36 hours from the time water enters the plant until it is released.

During this time, plant operators constantly monitor flow rates, chemical levels, bacteria activity, and water quality. Their job is to make sure the plant follows safety standards and releases properly treated water.

The Role of Wastewater Plant Operators

Wastewater treatment plants do not run successfully on their own. Skilled operators work day and night to keep the system functioning.

They adjust equipment, test samples, monitor chemical levels, and respond to changes in water flow. Their work may not be glamorous, but it is essential for public health, sanitation, and environmental protection.

Final Thoughts

Wastewater treatment is a hidden but powerful part of modern life. Every flush, shower, and drain connects to a larger system designed to protect people and the environment.

Although it may seem unpleasant to think about sewage, the engineering behind wastewater treatment is impressive. It turns dirty water into treated water that can safely return to nature and, in some cases, even be reused.

Without wastewater treatment plants and the people who operate them, modern cities would face serious sanitation problems. So the next time you flush, remember that an entire system is working quietly behind the scenes to keep life clean, safe, and healthy.

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