BIOLOGY IN HUMAN WELFARE
MICROBES IN HUMAN WELFARE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Consumption of organic matter
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Reduction of BOD
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Reduction in polluting potential
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Reduction of inorganic salts
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Detailed explanation-1: -Flocs are masses of bacteria associated with fungal filaments to form mesh like structure. Flocs digest most of the organic material from the sludge. Thus, floc helps in reducing the BOD (Biochemical Oxygen Demand) of the effluent. This helps in further treatment of sludge.
Detailed explanation-2: -Flocs are masses of essential bacteria associated with fungal filaments to form a mesh-like structure. They are in a sludge structure. They help in increased aerobic decomposition as well as filament help in trapping particles when they are put in the secondary sewage tank.
Detailed explanation-3: -The biological floc is composed of bacteria, fungi and protozoa. Bacteria involve around 95% of the total microbial population of the activated sludge and they are essential for the degradation of organic substances in wastewater treatment systems.
Detailed explanation-4: -During the secondary treatment of primary effluents, the BOD level decreases because useful microbes consume a major part of the organic matter. Reduction in the organic matter leads to lowering of BOD.