非正规生活垃圾填埋场污染地下水修复的PRB反应介质试验研究  

Application of PRB Reaction Medium for Polluted Groundwater Remediation in Informal Domestic Waste Landfill

作　　者：陈彦美 张玉 李锐颖 梁龙飞 陈洁 姜晓萱 CHEN Yanmei;ZHANG Yu;LI Ruiying;LIANG Longfei;CHEN Jie;JIANG Xiaoxuan(College of Resources and Environment,Yangtze University,Wuhan 430100,China;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing 102209,China;Jiangsu Oilfield,Sinopec,Yangzhou 225009,China;Geophysical Exploration Brigade of Hubei Geological Bureau,Wuhan 430056,China)

机构地区：[1]长江大学资源与环境学院,湖北武汉430100 [2]煤炭开采水资源保护与利用国家重点实验室,北京102209 [3]中国石化股份有限公司江苏油田分公司,江苏扬州225009 [4]湖北省地质局地球物理勘探大队,湖北武汉430056

出　　处：《安全与环境工程》2023年第2期203-215,共13页Safety and Environmental Engineering

基　　金：煤炭开采水资源保护与利用国家重点实验室开放基金项目(SHJT-17-42.9);国家自然科学基金项目(41902257);湖北省自然科学基金项目(2020CFB750);长江大学大学生创新项目(2020379)。

摘　　要：我国存在大量的非正规生活垃圾填埋场,由于它们在运行之前没有采取严格的防渗防污措施,垃圾渗滤液下渗导致当地地下水严重污染。地下水污染原位修复技术中的渗透性反应墙(PRB)技术由于其运行成本低、能长期有效运行、不影响生态环境等优点已得到广泛应用。以湖北省石首市某非正规生活垃圾填埋场渗滤液污染的地下水为研究对象,通过静态批次试验,探索了PRB单一反应介质类型、反应温度、单一反应介质投加量、复合反应介质配比对污染地下水的修复效果,并通过SEM、XRD、FT-IR对不同反应介质的污染物去除机理进行了讨论。结果表明:3种单一反应介质即海藻酸钠(SA)-聚乙烯醇(PVA)包裹微球、生物炭和聚合氯化铝(PAC)-阳离子聚丙烯酰胺(C-PAM)改性膨润土对污染地下水中六价铬、氨氮、COD、总磷的最大去除率分别为99.96%、98.97%、88.58%、99.20%;在研究区地下水温度变化范围内,温度对单一反应介质去除污染物性能的影响不大;单一反应介质投加量对六价铬、氨氮和总磷最终去除率的影响不大,仅对COD的去除效果有影响,反应时间为120 h时1 g/100 mL的单一反应介质投加量下污染地下水中COD的去除率为88.58%,3 g/100 mL和5 g/100 mL的单一反应介质投加量下对COD的去除率均可达98.42%;按照3种单一反应介质2∶1∶1的质量比制备的复合反应介质,反应时间为120 h时其对污染地下水中六价铬、氨氮、COD、总磷的去除率分别为99.61%、96.03%、81.25%、99.20%。该研究结果可为研究区利用PRB技术修复非正规生活垃圾填埋场渗滤液污染的地下水提供理论依据。There are a large number of informal landfills in China.Due to the lack of strict anti-seepage and anti-pollution measures before operation,leachate infiltration has led to serious pollution of local groundwa-ter environment.The permeable reactive barrier(PRB)technology in the in-situ remediation technology of groundwater pollution has been widely used due to its low operating cost,long-term effective operation and no impact on the ecological environment.This paper takes the groundwater polluted by leachate from an informal domestic waste landfill in Shishou City,Hubei Province as the research object.The effects of reaction media type,reaction temperature9dosage and composite reaction medium ratio on the treatment of polluted groundwater were explored,and static batch experiments were carried out.SEM、XRD and FT-IR were used to characterize the reaction media.The results show that three single reaction media,namely sodium alginate(SA)-polyvinyl alcohol(PVA)-coated microspheres>biochar and polyaluminum chloride(PAC)-cationic polyacrylamide(C-PAM)modified bentonite have the highest removal rates of hexavalent chromium,ammonia nitrogen,COD and total phosphorus.The maximum removal rates are 99.96%,9&97%,88・58%and 99.20%,respectively.Within the annual temperature variation range of groundwater in the study area,the temperature has little effect on the pollutants removal performance of the single reaction medium.The dosage has little effect on the final removal rates of hexavalent chromium,ammonia nitrogen and total phosphorus・It only has a certain effect on the removal of COD.At 120 h,the removal rate is 88.58%under the dosage of 1 g/100 mL,and the removal rate is 98.42%at both 3 g/100 mL and 5 g/100 mL.The composite reaction medium was prepared according to the mass ratio of three single reaction mediums of 2!1!1,and the removal rates of hexavalent chromium,ammonia nitrogen,COD,and total phosphorus for 120 h are 99.61%,96.03%,81.25%,and 99.20%,respectively.The results provide a theoretical basis for the use of P

关 键 词：非正规生活垃圾填埋场 污染地下水修复 渗透性反应墙(PRB)技术 复合反应介质 

分 类 号：X523[环境科学与工程—环境工程]