升流式厌氧污泥床处理含五氯酚废水的研究

研究了升流式厌氧污泥床反应器(UASB)在中温条件下处理含五氯酚(PCP)模拟废水时工艺特点及PCP降解机理。结果表明:①在以处理啤酒废水的厌氧颗粒污泥为接种物(VSS接种量约15 g /L)，运行温度为(35±1) ℃，水力停留时间为20～24 h，进水COD浓度为2 500～2 800 mg/L；进水PCP浓度由1.0 mg/L上升至8.0 mg/L条件下，120 d左右完成启动，PCP和COD去除率分别为94%及86%以上。②高效液相色谱仪检测结果分析表明，PCP厌氧降解的途径是首先经间位脱氯生成四氯酚和2，4，6－三氯酚，再经邻位和对位脱氯生成2，4－二氯酚和邻氯苯酚，最后矿化为CH₄和CO₂。 

A Study on the Anaerobic Treatment of Pentachlorophenol Wastewater in a UASB Reactor

In this study,the characteristics of anaerobic granules degrading pentachlorophenol(PCP) were investigated in a pilot-scale upflow anaerobic sludge blanket (UASB) reactor at (35±1)℃.Experimental results demonstrate:①When brewery waste-degrading granules obtained from a full-scale UASB reactor treating brewery wastewater were used as seed,the start-up process was completed within 120 d,with influent COD 2 500～2 800 mg/L,a hydraulic retention time 20～24 h and influent PCP 1.0～8.0 mg/L.The COD and PCP removal rates were 86% and 94% respectively.②The determinations of cholrophenols in effluent and reactor suggest that the PCP degrading granules dechlorinated PCP primarily at the meta-position,then at the ortho-position and the para-position,and a part of intermediates were finally to CH₄ and CO₂.