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Which of the following is another name given to conventional bio filters?

(a) Percolating filter

(b) Filter cake

(c) Injection recovery

(d) Bio-luminescence

The question was posed to me at a job interview.

Query is from Biological Treatment of Waste Water topic in section Biological Treatment of Waste Water of Environmental Biotechnology

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Best answer
The correct option is (a) Percolating filter

The best I can explain: Percolating filter, in which the waste trickles and which is oxidized and hence removed by biological degradation, Filter cake is the by-products of filtration left on the surface forming cakes, In-situ bioremediation involves certain techniques like Biosparging, Bioventing and Injection recovery whereas bioluminescence is an inherent light emitting property of biological organisms.

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