Niu Aping, Ren Yi-Wei, Yang Li, Xie Shao-Lin, Jia Pan-Pan, Zhang Jing-Hui, Wang Xiao, Li Jing, Pei De-Sheng
Research Center for Environment and Health, Eco-Environmental Institute for Three Gorges, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 401122, China.
Center of Membrane Technology, Eco-Environmental Institute for Three Gorges, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 401122, China.
Chemosphere. 2016 Jul;155:100-108. doi: 10.1016/j.chemosphere.2016.04.045. Epub 2016 Apr 22.
Landfill leachate has become an important source of environmental pollution in past decades, due to the increase of waste volume. Acute toxic and genotoxic hazards to organisms can be caused by landfill leachate. Thus, how to efficiently recover water from landfill leachate and effectively eliminate combined toxicity of landfill leachate are the most pressing issues in waste management. In this study, EDTA-Na2Zn as draw solution (DS) was used to remove the toxicity of membrane bioreactor-treated landfill leachate (MBR-treated landfill leachate) in forward osmosis (FO) process, and nanofiltration (NF) was designed for recovering the diluted DS. Zebrafish and human cells were used for toxicity assay after the novel wastewater treatment process using EDTA-Na2Zn as DS. Results showed that the water recovery rate of MBR-treated landfill leachate (M-LL) in FO membrane system could achieve 66.5% and 71.2% in the PRO and FO mode respectively, and the diluted DS could be efficiently recovered by NF. Toxicity tests performed by using zebrafish and human cells showed that M-LL treated by EDTA-Na2Zn had no toxicity effect on zebrafish larvae and human cells, but it had very slight effect on zebrafish embryos. In conclusion, all results indicated that EDTA-Na2Zn as DS can effectively eliminate toxicity of landfill leachate and this method is economical and eco-friendly for treatment of different types of landfill leachate.
在过去几十年中，由于垃圾量的增加，垃圾渗滤液已成为环境污染的一个重要来源。垃圾渗滤液可对生物体造成急性毒性和遗传毒性危害。因此，如何从垃圾渗滤液中高效回收水以及有效消除垃圾渗滤液的综合毒性是废物管理中最紧迫的问题。在本研究中，使用乙二胺四乙酸二钠锌（EDTA-Na2Zn）作为汲取液（DS），在正向渗透（FO）过程中去除膜生物反应器处理后的垃圾渗滤液（MBR处理后的垃圾渗滤液）的毒性，并设计纳滤（NF）来回收稀释后的汲取液。在使用EDTA-Na2Zn作为汲取液的新型废水处理工艺之后，使用斑马鱼和人类细胞进行毒性测定。结果表明，在FO膜系统中，MBR处理后的垃圾渗滤液（M-LL）在压力 retarded 渗透（PRO）模式和FO模式下的水回收率分别可达到66.5%和71.2%，并且稀释后的汲取液可通过纳滤有效回收。使用斑马鱼和人类细胞进行的毒性测试表明，经EDTA-Na2Zn处理的M-LL对斑马鱼幼虫和人类细胞没有毒性作用，但对斑马鱼胚胎有非常轻微的影响。总之，所有结果表明，EDTA-Na2Zn作为汲取液可有效消除垃圾渗滤液的毒性，并且该方法对于处理不同类型的垃圾渗滤液既经济又环保。
