Name: Microbes as Biopesticides
Uploaded: 2019-07-19
Duration: 8 min 10 s
Description: The use of microbes like fungi, bacteria, yeast, and viruses as biocontrol agents and to enhance biodiversity, might sound strange! Let's know how these micr...

Question

Describe the role of Microbes in sewage treatment plant.

Accepted Answer

The treatment of sewage completes into three steps known as primary, secondary, and tertiary treatment. The microbe’s role comes in action in secondary treatment, also known as biological treatment. The biological treatment starts from aeration tank where primary effluent is poured and agitated so that the groups of microbes present in the effluent start consuming the organic matter present in the effluent. The microbes reduce the biological oxygen demand of water and purify it; after that, the secondary effluent is used as activated sludge for further treatment of primary effluent.

The remaining part of the sediment microbe is transferred to anaerobic sludge digester, and the microbes anaerobically produce the methane, carbon dioxide, and hydrogen sulphide that is used as biogas. The effluent treated in secondary treatment further undergoes tertiary treatment to check its quality by chemical reaction test.

The role of microbes in sewage treatment plants is as follows: The excess of nitrates and phosphates from fertilizers runs off into the ponds and streams. It leads to the formation of thick algal bloom, which is formed of blue green or green algae. Due to the biomass load, there is oxygen depletion, which leads to the suffocation of aquatic plants. The nutrients utilized during eutrophication is phosphate, followed by nitrate. The nutrients increase the growth and productivity of aquatic plants. It promotes the growth of marshy plants, which is finally converted into the land.

Describe the role of Microbes in sewage treatment plant.

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