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During the primary treatment of sewage, solid particles that settle down are called __________.
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Important Questions on Microbes in Human Welfare
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The purpose of biological treatment of waste water is to --------------.
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The masses of bacteria held together by slime and fungal filaments to form mesh-like structures are called as ----------------------.
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Read the following statements and select the correct option.
Statement I: BOD represents the amount of dissolved oxygen that would be consumed if all the organic matter in one litre of water were oxidised by microorganisms.
Statement II: High value of BOD indicates that water is highly polluted by organic matter.
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BOD is _______ in polluted water and ______ in potable water.
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Biochemical oxygen demand (BOD) in a river water
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When domestic sewage mixes with river water
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A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called as
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In the sewage treatment, bacterial flocs are allowed to sediment in a settling tank. This sediment is called
