7. In aerated tanks
a) Solid wastes are separated b) organic matter is decomposed
c) Sludge is burnt
d) waste water is treated with chlorine
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Answer:
Sluedge is burnt
Explanation:
The activated sludge process is the most common option in secondary treatment. Aeration in an activated sludge process is based on pumping air into a tank, which promotes the microbial growth in the wastewater. The microbes feed on the organic material, forming flocks which can easily settle out.
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ans is d waste water is treated with chlorine
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