Discussion
Anaerobic treatment of effluents has the following advantage :
Answer: D
Anaerobic treatment has all of the above advantages.
Anaerobic digestion breaks down organic matter without oxygen. It reduces the COD and BOD of strong effluents such as those from distilleries and dairies. It generates methane-rich biogas that can be used as fuel. And because no aeration is needed, its power requirement is much lower than that of aerobic treatment; it also produces less sludge.
Each listed advantage is real, so choosing only one of them leaves out the others.
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