石灰混凝-浸没蒸发协同处理垃圾渗滤液纳滤膜浓缩液

为提高垃圾渗滤液膜浓缩液减量化水平，采用石灰混凝-浸没蒸发协同处理纳滤膜浓缩液，获得了处理过程中水质变化规律。结果表明:单独采用石灰混凝处理，在石灰投加量为2 g/L时，膜浓缩液混凝软化效果最佳；随着石灰投加量增加，此时，膜浓缩液pH=10.58，硬度去除率为29.1%，COD去除率为24.1%，NH₃-N去除率为67.3%。。采用石灰混凝-浸没蒸发协同处理，石灰投加量为2 g/L、浓缩倍率为10时，蒸发残液软化效果进一步提升，较单独处理，硬度去除率由29.1%提升至65.9%，COD去除率由24.1%提升至41.2%，NH₃-N去除率由67.3%提升至81.4%；K+浓度由样液中4300 mg/L提高到36210 mg/L、Na+浓度由5860 mg/L提高到48300 mg/L，为资源化利用提供了条件；冷凝液ρ（COD）由26.3 mg/L降低至16.3 mg/L，ρ（NH₃-N）由2.0 mg/L降低至1.4 mg/L，出水可满足GB 16889—2008《生活垃圾填埋场污染控制标准》相关要求。

LIME COAGULATION-SUBMERGED EVAPORATION SYNERGISTIC TREATMENT FOR NANOFILTRATION MEMBRANE CONCENTRATE OF LANDFILL LEACHATE

In order to improve quantitative reduction of the landfill leachate membrane concentrate, the nanofiltration membrane concentrate was treated by lime coagulation-submerged evaporation, and the change rule of water quality was obtained. The results showed that in the lime-coagulation treatment alone, the softening effect of membrane concentration was best when the dosage of lime was 2 g/L; with the increase of lime dosage, the pH of the membrane concentrate, and the removal rate of COD, NH₃-N, and metal ions (Fe3+, Mg2+, Al3+, K+ and Na+) increased. In lime coagulation-immersion evaporation synergistic treatment, when the dosage of lime was 2 g/L and the concentration ratio was 10, compared to coagulation alone, the softening effect of evaporation residue liquid was further improved, with hardness removal rate increased from 29.1% to 65.9%, COD removal rate increased from 24.1% to 41.2%, NH₃-N removal rate increased from 39% to 81.4%, and K+ and Na+ concentration increased from 4300,5860 mg/L to 36210, 48300 mg/L, respectively. That provided conducive condition for the latter resource utilization. COD concentration in the condensate decreased from 26.3 mg/L to 16.3 mg/L, and NH₃-N decreased from 2.0 mg/L to 1.4 mg/L, complying with the relevant requirements of the Control Standard for Domestic Waste Landfill (GB 16889—2008).