模拟城市污水在厌氧、缺氧以及好氧反应器中的毒性削减研究

Toxicity Reduction of Synthetic Municipal Wastewater Treated by Anaerobic,Anoxic or Aerobic Reactors

采用发光细菌法测定城市污水毒性,并研究了模拟城市污水分别在厌氧、缺氧、好氧条件下的毒性削减情况.试验采用人工配水,其中添加了甲苯、邻二甲苯、对二甲苯、吲哚、吡啶、环己酮、苯丙酸7种有毒有机物.并用GC-MS检测上述有机物在不同生物处理过程中的降解情况及出水有机物的变化情况.结果表明,模拟城市污水经厌氧生物处理后毒性增大(HRT≤10h);缺氧生物处理对模拟城市污水的毒性略有削减;而好氧生物处理对模拟城市污水的毒性削减能力较强,效果明显.

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.