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[Toxicity reduction of synthetic municipal wastewater treated by anaerobic, anoxic or aerobic reactors].

Bioassay with Photobacterium phosphoreum was used to evaluate the toxicity of municipal wastewater. The toxicity reduction capabilities of three biological treatment processes (anaerobic reactor, anoxic reactor and aerobic reactor) treating the synthetic municipal wastewater were studied. Seven compounds including toluene, p-xylene, o-xylene, indole, pyridine, cyclohexanone and benzenepropanoic acid were selected to represent the main organic toxicants in the municipal wastewater. The GC-MS analysis was conducted to study the transformation of organic compounds in the effluents. The results show that in anaerobic reactor, the toxicity of effluent was higher than influent at short HRTs (no more than 10 h). The toxicity reduction capability of the anoxic reactor was in the medium level among the three reactors. The aerobic reactor had the strongest toxicity reduction capability.