Biological Treatment of PUlp And Paper OCntaminated Gas in a Shallow Activated Sludge Reactor

摘要

A shallow activated sludge reactor has bee ntested in the laboratory as an alternative to biofiters for treating organic compunds in contaminated gases expected from pulp and paper mills. The contaminated gas stream is bubbled into the SASR through fine bubble diffusers. The volatile organic compounds are traanferred from the gas to liquid phase where they are degraded by the activated sludge. The SASR testing was done with a 0.36-m liquid depth, 1.8-m sup 3/m sup 2-hr gas flow rate, 10-day solids retention time, and 50 degree reactor mixed liquor temperature. The VOCs added to the SSGR influent gas stream were accetaldehyde, acrolein, methoanol, methylethy-ketone, benzene, toluene, para-xylene, ortho-xylene and meta-xylene at influent ocncentrations ranging from 15 ppm for the xylenes to 1300 pm for methoanol. A mechanistic mass transfer and biodegradation model was evaluated to determine reactor liquid depths needed for 90-99