电镀工业园区废水处理工艺改造

针对湖北省某电镀园区污水处理厂出水水质不稳定的问题,在铜镍络合废水物化处理段增加铁碳微电解池和芬顿氧化池;将A/O工艺改为A/O-MBR工艺;增加多介质过滤+反渗透+超滤组合工艺作为深度回用处理系统。经过一年的实际运行,其出水总铬、六价铬、总镍、总铜、总锌、SS、COD、TN、NH3-N、TP均达到《电镀污染物排放标准》(GB 21900-2008)表3规定限值和《湖北省汉江中下游流域污水综合排放标准》(DB 42/1318-2017)二者中的最严值,极大改善了周围的水环境,对同类型电镀园区污水处理厂的改造具有一定的借鉴意义。

Process Reconstruction and Optimization Design of Electroplating Wastewater Containing Complex Heavy Metals

In view of the unstable effluent quality of an electroplating treatment plant of Hubei Province,the original process was modified. The iron-carbon micro-electrolysis and Fenton oxidation was added to the physical and chemical treatment section of copper-nickel complex wastewater. The original A/O process was changed to A/O-MBR process. A combined technology including multi-media filtration,reverse osmosis,and ultrafiltration was added as advanced reuse treatment process. After one year of actual operation,its effluent total chromium,hexavalent chromium,total nickel,total copper,total zinc,SS,COD,NH3-N,TP all reached the limits in table 3 of Emission Standard of Pollutants for Electroplating (GB 21900-2008) and the most stringent limits in the Comprehensive Wastewater Discharge Standard for the Middle and Lower Reaches of the Han River in Hubei Province (DB 42/1318-2017),and consequently the surrounding water environment was improved. It could provide reference for process modification of similar electroplating wastewater projects.