| 摘要 |
<p>A method of reducing the AOX (ie the concentration of halogenated organic compounds) in waste water comprises feeding water having an AOX of at least 1mg/l into a biological treatment unit and contacting the water with activated sludge and either powdered lignite or activated carbon. Preferably the contact is for 3-24 hours and reduces the AOX by up to 95%. The coke/carbon may be added to the activated sludge prior to introduction of the waste water. The water may contain chlorinated organic compounds and originate from production of propylene oxide, epihalohydrin, cellulose ether, epoxy resin or a halogenated hydrocarbon. The water may be pretreated by stripping, absorption, pH adjustment or by adding nutrients for bacteria used in the activated sludge.</p> |
