What Happens In Secondary Sewage Treatment

The secondary stage of treatment removes about 85 percent of the organic matter in sewage by making use of the bacteria in it. The principal secondary treatment techniques used in secondary treatment are the trickling filter and the activated sludge process.,

What steps are taken during secondary treatment of waste water Why secondary treatment is called biological treatment?

Secondary treatment removes the dissolved organic matter by the use of biological agents and hence, known as biological treatment. This is achieved by microbes which can consume and degrade the organic matter converting it to carbon dioxide, water, and energy for their own growth and reproduction.

What is meant by secondary treatment?

Secondary treatment of wastewater works on a deeper level than primary level. It is called as biological treatment because it is designed to substantially degrade the biological content of the waste through aerobic biological processes. This step removes the dissolved organic matter by the use of biological agents.

What happens in aeration tank in secondary sewage treatment?

Secondary treatment is the second step in most waste treatment systems during which bacteria consume the organic parts of the wastes. This is accomplished by bringing the sewage, bacteria and oxygen together in trickling filters or within an activated sludge process.Mar 13, 2003

What is the main goal of secondary wastewater treatment?

Aeration in Wastewater Treatment The activated sludge process is the most common option in secondary treatment, according to Oxymem. Aeration is an activated sludge process, promoting microbial growth in the wastewater. The microbes then feed on organic material, forming flocks which easily settle out.Sep 9, 2020

What steps are taken during secondary treatment of wastewater?

The objective of secondary treatment is the further treatment of the effluent from primary treatment to remove the residual organics and suspended solids.

What are the steps involved in secondary treatment?

(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment. (ii) Secondary sewage treatment is mainly a mechanical process. (iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.

What happens in the secondary treatment tank?

Secondary TreatmentnnFrom the Primary Clarifiers, the wastewater flows into large, rectangular tanks called Aeration Basins, where a biological treatment called the “activated sludge process” occurs. The wastewater flows slowing through a series of chambers as large volumes of air are bubbled up through the water.

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