Lecture 10

Armenante njit examples of filtration operations in

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Unformatted text preview: clarifier after heavy metal precipitation as hydroxides, sulfides or carbonates PIERO M. ARMENANTE NJIT Examples of Filtration Operations in Hazardous Waste Treatment (cont' d) • Dewatering of the sludge formed during heavy metal precipitation • Dewatering of floating sludge after air flotation of wastewaters containing oily residues prior to sludge incineration • Dewatering of (anaerobically or aerobically) digested activated sludge used in the treatment of wastewaters containing toxic organic priority pollutants prior to sludge incineration PIERO M. ARMENANTE NJIT Limitations to the Use of Filtration Filtration cannot: • remove solutes in solution (although filters that are able to retain an active microbial population can partially operate as bioreactors and produce some degradation of soluble materials); • separate chemical constituents present in the same phase; • be used to process viscous materials; • be used to process solid wastes. PIERO M. ARMENANTE NJIT Cross-Flow Filtration PIERO M. ARMENANTE NJIT Cross-Flow Filtration • In cross flow filtration the slurry flows parallel to the filter medium on one side of it. Only the clarified liquid can cross the filter medium and exit on the other side • Bec...
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This document was uploaded on 03/30/2014 for the course CHEM 685 at NJIT.

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