Wastewater Treatment Process

What is Wastewater Treatment?

Waste water Treatment is a action used to convert wastewater into an discharge that can be returned to the water cycle with margin brunt on the environment, or directly restate. The recent is called water advancement because treated wastewater can then be used for other determination. toxic waste in municipal wastewater (households and small industries) are removed or collapsed physically lower.

The treatment of wastewater is part of the throughout field of cleanliness. cleanliness also includes the management of personage waste and solid waste as well as cyclone water (drainage) administration. By-products from wastewater treatment plants, such as screenings, grit and sewage sludge may also be treated in a wastewater treatment plant.

Step by Step Wastewater Treatment Process

The following is a step by step process of how wastewater is treated:

Wastewater Collection

This is the first step in waste water treatment process. Assemblage systems are put in place by concerning cities administration, home owners among other things business owners to ensure that all the wastewater is collected and conducted to a centralize. The pipes or tracks should be leak proof and the people offering the exhausting services should wear protective clothing.

Odor Control

At the treatment plant, odor control is very important. Wastewater accommodate a lot of dirty material that cause a infringement over time. To establish that the surrounding areas are free of the infringement. All smell sources are contained and treated using chemicals to neutralize the infringement generating elements. 


Screening require the removal of large objects for example nappies, cotton buds, plastics, diapers, rags, sanitary items, face wipes, broken bottles or bottle tops,wooden piece, grass that in one way or another may damage the equipment. The stable wastes removed from the wastewater are then transported and disposed off in junkyard.

Primary Treatment

This dispose of affect the separation of infinitesimal solid matter from the wastewater. Primary treatment is done by exhausting the wastewater into considerable tanks for the solid material to clear at the surface of the tanks. The sludge waste that clear at the exterior of the tanks, is removed by large scrappers and is pushed to the center of the cylindrical tanks and later pumped out of the tanks for promote analysis. The hesitate water is then pumped for secondary analysis.

Secondary Treatment

Likewise accepted as the activated silt process, the secondary treatment stage involves adding source silt to the wastewater to ensure that is busted down further. Air is first pumped into excessive discourse tanks which mix the wastewater with the source silt which is basically small amount of silt, which ammunition the growth of bacteria that uses oxygen and the growth of other small bacterium that consume the pausing organic affect. This process manage to the synthesize of large particles that settle down at the bottom of the excessive tanks. The wastewater passage through the large tanks for a period of 3-6 hours.

Bio-solids handling

The solid matter that settle out after the primary and secondary treatment stages are directed to dig-esters. The dig-esters are heated at room temperature. The solid wastes are then treated for a month where they undergo anaerobic absorption. During this process, methane gases are produced and there is a formation of nutrient rich bio-solids which are recycled and watered into local firms. The methane gas formed is commonly used as a source of energy at the analysis plants. It can be used to produce electricity in engines or to simply excursion plant equipment. This gas can also be used in boilers to generate heat for consume.

Tertiary treatment

Tertiary treatment stage is similar to the one used by drinking water treatment plants which clean raw water for drinking consider. The tertiary treatment stage has the ability to remove up to 99 percent of the pollutant from the wastewater. This produces discharge water that is close to drinking water quality. 


After the primary treatment stage and the secondary treatment process, there are still some diseases causing organisms in the remaining treated wastewater.The wastewater must be disinfected for at least 20-25 minutes in tanks that contain a mixture of chlorine and sodium hypocrite.  The discharge (treated waste water) is later released into the climate through the local water ways.

Sludge Treatment

The sludge that is produced and collected during the primary and secondary treatment processes requires concentration and thickening to enable further processing. It is put into thickening tanks that allow it to settle down and later separates from the water. This process can take up to 24 hours. The remaining water is collected and sent back to the huge aeration tanks for further treatment. The sludge is then treated and sent back into the environment and can be used for agricultural use.

Wastewater treatment has a number of benefits. For example, wastewater treatment ensures that the environment is kept clean, there is no water pollution, makes use of the most important natural resource; water, the treated water can be used for cooling machines in factories and industries, prevents the outbreak of waterborne diseases and most importantly, it ensures that there is adequate water for other purposes like irrigation.

About Zaighum Shah 57 Articles
Zaighum Shah is a mechanical engineer having more than 20 years of experience. Zaighum is specializing in product development in Sugar Mill industries. Zaighum has gone through all phases of mechanical engineering and it’s practical implementation. Zaighum has been solving most complex problems, designing new systems and improving existing models and systems.