摘要：

针对国内垃圾填埋场后期及封场渗滤液可生化性低、无法采用生化进行有效处理、膜浓缩液长期回灌、渗滤液累积盐分越来越高得不到解决等问题，提出一种全量化处理组合工艺，即“软化预处理+高压碟管式反渗透（DTRO）+特种分离膜+低温负压蒸发技术+三相固化技术”，适合盐分高、氨氮高、生化性低的终端渗滤液处理。运行结果表明，清水回收率可达到90%~95%，固化后填埋物仅为5%~10%。液相和固相处理系统优势互补，系统运行稳定，能耗较低，脱盐率达到99.5%以上；出水COD≤60 mg/L，BOD₅≤20 mg/L，氨氮≤8 mg/L，总氮≤20 mg/L，SS≤6 mg/L，产水符合《生活垃圾填埋场污染控制标准》（GB 16889—2008）表3规定的限值要求。

关键词: 后期及封场渗滤液, 全量化工艺, 特种分离膜, 低温负压蒸发技术, 三相固化技术

Abstract:

In view of the low biodegradability of the leachate in the late stage of domestic landfills and closures，it cannot be effectively treated by biochemistry. Furthermore， the membrane concentrate is recharged for a long time，and the increasingly accumulated salinity of the leachate cannot be solved. Aiming to these problems，they proposed a combined process of full quantitative treatment，namely “softening pretreatment， DTRO， special separation membrane， low temperature negative pressure evaporation technology and three-phase curing technology”，which is suitable for terminal leachate with high salinity，high ammonia nitrogen and low biochemical properties. The operation results showed that the recovery rate of clean water can reach 90%-95%，and the landfill after solidification was only 5%-10%. The advantages of liquid and solid phase treatment systems complemented each other，and the system run stably，with low energy consumption. The desalination rate reached more than 99.5%，effluent COD≤60 mg/L，BOD₅≤20 mg/L，ammonia nitrogen≤8 mg/L，total nitrogen≤20 mg/L，SS≤6 mg/L. And the produced water met the limit requirements specified in Table 3 of the Standards for Pollution Control of Domestic Waste Landfills （GB 16889—2008）.

Key words: late stage and closure leachate, full quantification process, special separation membrane, low temperature negative pressure evaporation technology, three-phase curing technology

中图分类号: 

• X703