A/BCO-人工湿地系统处理工业园区混合污水

Purification Effect of A/BCO/Constructed Wetland System on Mixed Wastewater from Industrial Park

研究了厌氧/生物接触氧化—人工湿地系统(A/BCO—CW)对南海工业园区混合污水的处理效果,并将A/BCO部分与湿地部分的处理效果进行了比较。全年运行结果表明,该系统对COD、BOD_5、TSS、NH_3-N、TP的去除率分别达到了86.2%、91.4%、94.5%、87.7%、90.3%,出水水质长期稳定达到《地表水环境质量标准》(GB 3838—2002)的Ⅳ类水标准。系统中A/BCO部分对COD、BOD_5、TSS、NH_3-N、TP的去除负荷分别达到1 550、640、790、120和45 g/(m^2·d),去除率分别为63.1%、67.7%、66.2%、62.5%、37.6%,避免了人工湿地堵塞,提高了处理效率;系统中湿地部分对COD、BOD_5、TSS、NH_3-N、TP的去除负荷分别达到13.6、5.3、5.7、0.90和0.44 g/(m^2·d),去除率分别为42.9%、71.2%、85.2%、67.3%和81.5%。两种工艺有效组合对混合污水的处理效果较好,使得系统更具有稳定性与耐冲击能力,适合处理工业园区、小城镇污水等。

The efficiency of the anaerobic/biological contact oxidation/constructed wetland （A/ BCO - CW） system in the treatment of the mixed wastewater from the industrial park in Nanhai District of Foshan City was investigated, and the treatment effieiencies of A/BCO and CW were compared. The re- suits from 12 months showed that the removal rates of COD, BODs, TSS, NH3 - N and TP by the system were 86.2% , 91.4% , 94.5% , 87.7% and 90.3% respectively, and the effluent quality could meet the Ⅳ criteria specified in the Environmental Quality Standards for Surface Water （GB 3838 -2002 ）. The removal loading rates of COD, BODs, TSS, NH3 - N and TP by A/BCO were 1 550 g/（ m2 · d） , 640 g/（m2 · d）, 790 g/（m2·d）, 120 g/（m2 · d） and 45 g/（m2 ·d）, and the removal rates were 63.1%, 67.7%, 66.2%, 62.5% and 37.6%, respectively, which could avoid the wetland clogging and improve the treatment efficiency. The removal loading rates of COD, BODs, TSS, NH3 - N and TP by CW were 13.6 g/（m/ · d）, 5.3 g/（m/ · d）, 5.7 g/（m2 · d）, 0.90 g/（m2 · d） and 0.44 g/（m2 · d） , and the removal rates were 42.9% , 71.2% , 85.2% , 67.3% and 81.5% , respectively. The effective combination of the two methods has excellent performance in treating mixed wastewater from indus- trial park or small town, which makes the system more stable and resistant to impact, thus, being worthy of popularization and application.