膜生物反应器去除原水中微量2,4,6-三氯酚的研究

REMOVAL OF TRACE TCP FROM SURFACE WATER BY MEMBRANE BIOREACTOR

2,4,6-三氯酚(2-4-6-trichlorophenol-TCP)普遍存在于地表水和工业废水中。采用一体式膜生物反应器(Membrane bioreactor-MBR)进行去除微污染湖水中微量TCP(40～360μg/L)的试验。结果表明:稳定运行后MBR对TCP的平均去除率为98.13%。连续试验发现,在进水TCP浓度呈现明显波动的情况下,出水平均浓度为2.66μg/L,满足城市供水水质标准(CJ/T206-2005)规定的要求。同时采用间歇试验对MBR去除TCP的动力学机理进行了研究,证实生物作用在TCP的去除中起主要作用。MBR对TCP的去除符合零级动力学过程,降解速率常数为1.65μg/L·min。

2- 4- 6- trichlorophenol （TCP）exists universally among surface water and industrial wastewater.The trace TCP in micro-polluted lake water could be removed effectively by MBR. When the concentration of TCP in raw water was fluctuated between 40-360 μg/L, the averaged rernoval efficiency reached to 98.13% at stable stage. Continuous lab-scale test proved that averaged TCP concentration in the treated water was 2.66 μg/L, which meets the Water Quality Standard for Urban Water Supply （C J/T206-2005 ）issued by the Ministry of Construction. At the same time, intermittent tests were carried out to study the TCP removal mechanisms of MBR. It is concluded that biological effect plays a major role in TCP removal by MBR. Besides,based on experimental data, it was found that biodegradation of TCP followed zero-order kinetics with a rate constant of 1.65μg/L·min.