渗滤液组合工艺处置过程污染物组分迁移变化特性  

Migration Characteristics of Pollutants in Landfill Leachate Disposed with Combined Treatment System

作　　者：杨健 Yang Jian(Guangzhou Baiyun Environmental Monitoring Station,Guangzhou 510440,China)

机构地区：[1]广州市生态环境局白云环境监测站,广东广州510440

出　　处：《广东化工》2023年第24期97-99,共3页Guangdong Chemical Industry

摘　　要：针对采用间歇式活性污泥反应器(SBR)、混凝(C-F)、芬顿氧化(Fenton)和曝气生物滤池(BAF)技术的生活垃圾填埋场渗滤液组合处置工艺系统,研究经过不同处置单元处理后,污染物迁移变化特性及对重金属Cu、Zn、Pb、Ni、Cr和Cd的稳定态组分、自由态组分和胶体组分等三种形态组分迁移分布特性。结果表明,经过处理,垃圾渗滤液处理体系总体色度、浊度(NTU)、悬浮物质(SS)、生化需氧量(BOD_(5))和化学需氧量(COD)总去除率达到了99%、99%、92%、99%和98%以上,其中活性污泥反应器工艺对金属的去除顺序由小到大顺序依次为Al<Ni<Cd<Pb-Mn<Cu<Cr<Zn,其中镉(Cd)和锌(Zn)的去除在芬顿工艺中的混凝(C-F)效果明显。此外,经污泥反应器处理后锌(Zn^(2+))和镍(Ni^(+))的自由离子态组分分别提高至35%和42%,末端曝气生物滤池(BAF)的出水中,除铜(Cu)和铅(Pb)外,其它重金属稳定组分比例升高。使用Visual MINTEQ平衡模型预测的结果显示了垃圾渗滤液中锌和镍的组分主要为碳酸盐类化合物(MHCO_(3)^(+))自由态的组分,经过处理生化处理后转变成了自由态离子(M^(z+))。本研究结果可为垃圾渗滤液处理体系设计优化提供参考。Landfills leachate was treated by batch activated sludge reactor(SBR),Fenton oxidation(Fenton),coagulation(C-F)and biological aerated filter(BAF)technology.The metals fractions in treatment process were separated into three fractions:non-labile fractions,free ion/labile(cation exchange)and particulate and colloidal(size charge filtration).The results showed that after combined process treatment,the total removal rates of chroma of leachate,turbidity,SS,BOD_(5) and COD reached 99%,99%,92%,99%and 98%,respectively.The metal removal rate SBR was Zn>Cr>Cu>Pb-Mn>Cd>Ni>Al.Zn and Cd were effectively removed by coagulation stage of Fenton.The proportion of Zn and Ni free ions increased significantly to 35%and 42%treated by SBR.In the final BAF process effluent,the proportion of stable components of other metals increased,except Pb and Cu.At the same time,the Visual MINTEQ equilibrium model prediction showed that the free ions/unstable components of Ni and Zn in leachate raw water were carbonate compounds(MHCO_(3)^(+)),and change into free ions(M^(z+))after treated by the joint process.The results provide a reference for the design optimization of landfill leachate disposal system.

关 键 词：填埋场渗滤液 重金属 形态 迁移变化 Visual MINTEQ模 

分 类 号：X52[环境科学与工程—环境工程]