Which one of the following statements is true to trickling filter slud

1.	Which one of the following statements is true to trickling filter sludge ?
A.	It has a comparatively low sludge volume index
B.	It is more difficult to dewater than activated sludge
C.	It has a comparatively low concentration of sludge solids
D.	It is bulky
Answer» B. It is more difficult to dewater than activated sludge

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Which one of the following statements is true to trickling filter sludge ?

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