Abstract
In order to investigate the behavior of the organic halides precursor in the activated sludge process, bench scale reactors were operated at various organic loadings. Trihalomethane formation potential (THMFP) and total organic halides formation potential (TOXFP) were measured as the organic halides precursor. The effluent from the reactor fed by potato starch which has not THMFP produced THMs with the reaction of chlorine. In the experiments using primary settled municipal sewage or its 8μm filtrate, the removal of THMFP was mainly associated with the removal of particulate precursor. THMFP of the effluent was related with a hard biodegrable organics in the influent and biological metabolic by-products. The ratio of THMFP/TOC of the effluent was increased than that of the influent, since the removal efficiency of THMFP was lower than that of TOC. TOXFP removal efficiency was almost the same as TOC removal efficiency.
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