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The slime layer on trickling filter media is properly called a

  • A.grit deposit
  • B.biofilm
  • C.floc
  • D.scum blanket

Answer: B

A biofilm is a community of organisms attached to a surface within a matrix they secrete, and here it is the working part of the process. Floc is the analogous structure in activated sludge, where the community is suspended rather than attached.

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