Gujarat BoardEnglish MediumSTD 7ScienceWastewater Story1 Mark
MCQ
The liquid waste which has dissolved and suspended impurities is:
A
Sludge
✓
Sewage water
C
Potable water
D
None of the above
✓
Answer
Correct option: B.
Sewage water
Option $(A)$
The sewage effluent is pumped into an aeration or oxidation tank which contains sludge.
The flocs later sediment at the bottom of the aeration tank and are known as activated sludge.
A part of activated sludge is pumped back into an aeration tank to act as inoculum while a major part of it is pumped into an anaerobic sludge digester for anaerobic microbial decomposition and production of biogas. Option $(B)$
Sewage water is determines as the waste water that has the maximum concentration of faeces, urine, and household waste.
The bacteria and fungi filaments are the categories of microbes naturally occurring in sewage water.
The bacteria multiply rapidly and along with the presence of fungus filaments form the large masses that are known as flocs. Option $(C)$
Potable water is the drinking water which does not contain any effluent or sewage components.
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