化工学报Issue(6)：2280-2287,8.DOI:10.11949/j.issn.0438-1157.20150099
垃圾渗滤液生化出水絮凝-纳滤处理及过程机理
Flocculation-nanofiltration treatment of biologically treated leachate and process mechanism
摘要
Abstract
The leachate from incineration plant treating municipal solid waste (MSW) is a kind of wastewater, whose composition is very complicated and highly polluted, and after conventional biological treatment they can still not be directly discharged. According to characteristics of the biologically treated leachate, a combined process was proposed in which the biologically treated leachate was flocculated firstly by Ca(OH)2, and then the flocculated leachate was oxidized by ozone, and finally the ozonated leachate was filtered by NF membrane, and process mechanism was also explored. The experimental results indicated that Ca(OH)2 flocculation can effectively remove a large fraction of organic pollutants like heterocyclic compounds and improve the NF membrane flux. The permeate flux of flocculated effluent at the dosage of 8 g·L−1 Ca(OH)2 is increased by 8.2%compared with that of MBR effluent. The COD concentration in the flocculated leachate can be further reduced by the ozonation process, but NF membrane flux has no improvement. The reason could be that the siloxane compounds generated by the ozonation process caused the fouling of NF membrane. Compared with RO treatment process, ketones, amines, amides and heterocyclic compounds present in the biologically treated leachate can pass through the NF membrane. As a result, the NF permeate COD was increased by 100 mg·L−1 to 160 mg·L−1. Besides, the increases of NF average flux could lead to a slight increase of permeate COD. Membrane fouling is not obvious after the NF treatment of the biologically treated leachate and its pretreated samples.关键词
垃圾渗滤液/生化出水/混凝/氧化/纳滤Key words
municipal solid waste leachate/biologically treated leachate/coagulation/oxidation/nanofiltration分类
资源环境引用本文复制引用
晏云鹏,全学军,葛淑萍,罗丹,邱发成,徐飞..垃圾渗滤液生化出水絮凝-纳滤处理及过程机理[J].化工学报,2015,(6):2280-2287,8.基金项目
重庆市节能减排科技“接力”行动科技专项（CSTC2010AA7060）。@@@@ supported by the Special “Saving Energy and Reducing Emission Action Plan”of Chongqing (CSTC2010AA7060) （CSTC2010AA7060）
