MBR工艺处理工业园区电镀废水的中试应用研究

Pilot study on treatment of electroplating wastewater with MBR process in industrial park

针对工业园区电镀废水处理中生化指标达标难的问题,采用新型聚四氟乙烯(PTFE)膜组件构建膜生物反应器(MBR),通过现场试验研究了MBR工艺处理电镀废水的实际效果。结果表明,通过合理的维护管理,MBR膜通量能稳定维持在16.67L/(m2·h)左右,对COD的去除率可达到50%以上,出水COD质量浓度稳定在80mg/L以下,但对氨氮的去除效果受水力停留时间(HRT)、温度、系统负荷等因素的影响较大。与传统的生物接触氧化工艺相比,基于新型膜材料的MBR工艺可以大大提高污泥量,避免结垢和出水跑泥等问题,提高了处理效果。从投资运行费用来看,采用MBR工艺的总投资费用高于普通生化处理工艺,运行费用约为2元/t。

A membrane bioreactor （MBR） was made using novel PTFE membrane modules aiming at overcoming the difficulty in complying with the biochemical index requirements of emission standard for the treatment of electroplating wastewater in industrial park. The treatment effectiveness of the MBR process was studied on site in pilot scale. The result showed that the flux of MBR membrane remained at about 16.67 L/（m2.h） stably through reasonable maintenance and management. The removal rate of COD reached above 50%, and the concentration of COD in effluent was not higher than 80 mg/L. The removal of ammonia nitrogen was affected greatly by hydraulic retention time （HRT）, temperature, and loading capacity. Compared to the traditional biological contact oxidation process, the MBR process based on a novel membrane material increases the amount of sludge significantly, and eliminates the scaling problem and the run-off of sludge with effluent, thus improving the treatment effectiveness. The MBR process needs more investment than common biochemical treatment process and its running cost is about 2 RMB per ton.