垃圾渗滤液纳滤浓缩液深度处理工艺方法研究

Study on Advanced Treatment of Concentrated Liquid from Nanofiltration System of Landfill Leachate

渗滤液膜处理法以其运行稳定、出水效果良好、占地面积小的优势,与前端的生化法结合广泛地运用到渗滤液处理工程中,但膜滤产生的浓缩液有机浓度高、盐度高、色度高、可生化性低,未经处理返回到环境会造成极大的二次污染。文章采用混凝沉淀与臭氧高级氧化工艺方法联合处理垃圾渗滤液纳滤出水,有效提高了浓缩液可生化性,进而使之在生化系统中与渗滤液原液合并处理,连续稳定运行25 d,各项出水水质均低于《上海市污水排放综合标准》(DB 31/199-2009)相关限值,为渗滤液处理厂膜过滤浓缩液安全处理处置提供了有效技术途径。

Due to its stable operation effect, high treatment efficiency and few occupied space, membrane combined with biotreatment has been widely applied in leachate treatment plants in eastern China. However, with the characteristics of high organic concentration, high salinity, low biodegradability, concentrated liquid produced during this treatment process would pollute the environment if not treated properly. The paper developed the technical process, coagulation/sedimentation-ozone oxidation to improve the biodegradability of concentrated liquid from nanofiltration and achieve the feasibility of combined treatment of concentrated liquid and raw leachate. The pilot-scale experiment of 25 d indicates that the water qualities of effluent meet the Chinese standard DB 31/199-2009. The novel technical process provides an effective way to reduce the secondary pollution from leachate treatment plant.