Consider the following about the activated sludge process 1 It is a type of wastewater treatment pro...........

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Consider the following about the activated sludge process.

1.It is a type of wastewater treatment process.

2.It does not require the use of microorganisms.

3.It cannot be performed in the presence of oxygen.

Select the correct answer using the codes below.

1 only

2 and 3 only

1 and 2 only

1 and 3 only

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Explanation:

It is a process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa.
Activated sludge plant involves:
wastewater aeration in the presence of a microbial suspension, solid-liquid separation following aeration
discharge of clarified effluent, wasting of excess biomass, and
return of remaining biomass to the aeration tank.

In activated sludge process wastewater containing organic matter is aerated in an aeration basin in
which micro-organisms metabolize the suspended and soluble organic matter. Part of organic matter is synthesized into new cells and part is oxidized to CO2 and water to derive energy. In activated sludge systems the new cells formed in the reaction are removed from the liquid stream in the form of a flocculent sludge in settling tanks. A part of this settled biomass, described as activated sludge is returned to the aeration tank and the remaining forms waste or excess sludge.

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