VPH-0095
QUESTION
Formation of zoogleal layer play a very significant role in the working of?
OPTIONS
(A) Tricking filter
(B) Slow sand filter
(C) Both a and b
(D) None of the above
ANSWER
(C) Both a and b
EXPLANATION
A zoogloeal or biological layer plays an important role in both trickling filters and slow sand filters. In a trickling filter, microorganisms form a gelatinous biofilm over the filter media; this zoogloeal layer oxidizes and decomposes organic matter present in sewage. In a slow sand filter, a biologically active surface layer develops over the sand bed, commonly called the schmutzdecke or biological/zoogloeal layer, and it is primarily responsible for removing microorganisms and degrading organic matter. Therefore, formation of a zoogloeal layer is significant in the functioning of both trickling and slow sand filters, making option C correct.