应用亲电型悬浮生物载体处理工业废水的现场中试

研究采用本课题组研发的亲电改性聚乙烯为悬浮生物膜载体,构建移动生物膜与活性污泥复合工艺(integrated free-floating biofilm and activated sludge,IFFAS),对东北某工业园区污水处理厂的污水处理进行现场中试。结果表明,当进水ρ(COD)、ρ(NH3-N)、ρ(TN)分别为139~741,19.3~44.9,29.6~148.6 mg/L时,改性载体在10 d左右即可完成挂膜;中试IFFAS工艺稳定运行阶段,出水COD、NH3-N、TN的平均去除率分别高达88%、97%、80%,出水浓度分别为36~48,0.1~0.9,5~14.3 mg/L,达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级A排放标准。出水水质明显优于污水处理厂原有A2/O工艺出水,说明以亲电改性聚乙烯为载体的IFFAS工艺可显著提高净化污水的能力。

A FIELD PILOT-SCALE TEST OF TREATING INDUSTRIAL WASTEWATER WITH THE ELECTROPHILIC SUSPENDED BIOFILM CARRIER

In this study,a pilot scale integrated free-floating biofilm and activated sludge (IFFAS) process was set up for treating industrial wastewater in an industrial park of Northeast China,using electrophilic modified polyethylene as suspended biofilm carrier,which was developed by our lab.The results showed that when the influent COD,NH4+-N and TN concentrations were 139 ～741,19.3 ～ 44.9,29.6 ～ 148.6 mg/L,respectively,the biofilm formation time on the electrophilic modified carrier was about 10 days;and after the pilot scale IFFAS process reached the steady running stage,the average removal rates of COD,NH4+-N and TN reached up to 88％,97％ and 80％,respectively,and the effluent concentrations were 36 ～ 48,0.1 ～0.9,5 ～ 14.3 mg/L,respectively,which met the requirement of the first-class A of "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant" (GB 18918-2002).The effluent quality of the pilot-scale IFFAS process was better than that of the original A2/O process.Therefore,it was demonstrated that the IFFAS process using electrophilic modified polyethylene as biofilm carrier could significantly improve wastewater treatment capacity.