In order to solve the pipeline's fouling blocking caused by accumulation ofhardness ionsand the effected normal operation of the membrane system when the nanofiltration concentrated water and landfill leachate with high hardness and high basicityrecirculateto the landfill or the adjusting pool ,theexperiment adopts the medicine softening method to soften the concentrated water and the Fenton oxidationeffluent ,and studies the softening effects of the differentagents .The results showed thatat the optimal dosage ,the removal rate of hardness is92 .9% by adding calcium hydroxide and sodium hydroxide , and the cost is10 .95 RMB /m3 .When softening the Fenton oxidationeffluent ,the removal rate of hardness was 97 .3% by addingsodium hydroxide ,and the cost is 6 .3 RMB/m3 .It can reduce the hardness in the system effectively ,and mitigate the impact on membrane system and the phenomenon of pipeline's fouling blocking after softening .%为解决高硬度、高碱度垃圾渗滤液纳滤浓缩液回灌至垃圾厂或调节池时，硬度离子富集所造成的输送管道结垢堵塞和影响膜系统正常运行等问题，采用药剂软化法分别对浓缩液原水和Fenton氧化出水进行了软化处理实验，并研究了不同药剂的软化效果。结果表明：在有加药量下，当采用氢氧化钙＋氢氧化钠软化法时，硬度去除率为92．9％，药剂成本为10．95元／m3；做为Fenton工艺后除硬时，采用氢氧化钠软化法，硬度去除率为97．3％，成本为6．3元／m3。软化后可以有效降低系统中硬度，减轻对膜系统的影响以及管道结垢堵塞现象。
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