Fenton氧化膜-生物反应器出水中丙烯腈的实验研究

MBR-FENTON OXIDATION USED FOR THE TREATMENT OF WASTEWATER CONTAINING PROPYLENE NITRILE

采用膜-生物反应器和Fenton氧化组合工艺对丙烯腈废水进行处理。从GC/MS测量结果来看,膜-生物反应器出水中主要物质为2,6双(二甲基 乙基) 4 酚、苯二甲酸和硝基苯二甲酸,均为生物难降解有机物,使出水不能达标。后续Fenton氧化工艺处理膜生物反应器出水,可以使COD含量等指标达到所要求的排放标准。经过膜 生物处理与Fenton法结合的优化工艺,COD去除率达到80%～88%,BOD5去除率达到98%,出水水质可达排放标准。Fenton氧化工艺的最佳工艺条件为:pH值为3 4,硫酸亚铁的投加量为700mg/L,双氧水的投加量为600mg/L。

It is discussed to treat wastewater containing propylene nitrile through MBR and Fenton oxidation. From the results of GC/MS measurement, the effluent from MBR mainly contains 2,6-bismethylethyl-4-phenol, benzodicarboxylic acid, nitrobenzodicarboxylic, which are difficult to be degraded by microorganisms and to make the effluent quality to meet the criteria. The following Fenton oxidation can treat the effluent from the MBR to meet the limits of indexes such as COD_(Cr),BOD_5. Through the optimized technique of MBR and Fenton oxidation, the removal rate of COD_(Cr) can reach 80% to 88%, BOD_5 98%, meeting the effluent criteria. The actived sludge in MBR plays the great role in removing the organic compounds in propylene nitrile wastewater, and the membrane of the MBR can run partly in keeping good and stable effluent quality. The optimal conditions of Fenton oxidation are as follows: pH 3.4, ferrous sulphate 700mg/L, H_2O_2 600mg/L.