石灰混凝-浸没蒸发协同处理垃圾渗滤液纳滤膜浓缩液  

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

作　　者：戚二兵 黄亚继[1] 袁琦[1,2] 胡华军 樊聪慧[1] 曹彦彦 丁守一 QI Er-bing;HUANG Ya-ji;YUAN Qi;HU Hua-jun;FAN Cong-hui;CAO Yan-yan;DING Shou-yi(Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education,Southeast University,Nanjing 210096,China;Everbright Environmental Protection Technology Research Institute(Nanjing)Co.,Ltd,Nanjing 211000,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096 [2]光大环保技术研究院(南京)有限公司,南京211000

出　　处：《环境工程》2020年第12期54-58,77,共6页Environmental Engineering

基　　金：国家重点研发计划(2018YFC1901200);国家自然科学基金(51676040);江苏省自然科学基金(BK20181281)。

摘　　要：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。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,NH 3-N,and metal ions(Fe^3+,Mg^2+,Al ^3+,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%,NH 3-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 NH 3-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).

关 键 词：垃圾渗滤液 纳滤膜浓缩液 石灰 浸没蒸发 水质 

分 类 号：X703[环境科学与工程—环境工程]