生活垃圾掺烧市政污泥产生飞灰的螯合稳定化研究  

Study on Chelation Stabilization of Fly Ash Produced by MSW Co-incineration with Municipal Sludge

作　　者：龙吉生 张毅扬 阮大年 胡发立 LONG Jisheng;ZHANG Yiyang;RUAN Danian;HU Fali(Shanghai SUS Environment Co.Ltd.,Shanghai 201703)

机构地区：[1]上海康恒环境股份有限公司,上海201703

出　　处：《环境卫生工程》2023年第3期38-43,共6页Environmental Sanitation Engineering

摘　　要：以我国某垃圾焚烧电厂炉排炉掺烧市政污泥产生的飞灰作为试验样本,对掺烧污泥产生飞灰的重金属总量与浸出特性进行了分析比较。结果表明:与零掺烧相比,掺烧市政污泥虽然减少了飞灰中重金属的总量,但污泥掺烧产生的SOx消耗了碱性药剂使得飞灰的残留碱度明显下降,相应浸出pH低至5.27,Pb、Cd等重金属浸出浓度远高于GB 16889-2008生活垃圾填埋场污染控制标准限值。对掺烧污泥产生的飞灰添加10%的消石灰,可提高飞灰残留碱度,浸出pH提高至6.32,Pb、Zn、Cd、As浸出浓度均低于GB 16889-2008。因此在掺烧污泥的同时对烟气净化系统的脱酸药剂添加量进行灵活调整,对提高飞灰浸出稳定性有积极作用。The fly ash from the co-incineration of municipal sludge in the grate furnace of a MSWI was used as an experimental sample.The total amount of heavy metals and leaching characteristics of fly ash produced by mixing sludge were analyzed and compared.The results showed that compared with zero mixing firing,co-incineration of municipal sludge reduced the total amount of heavy metals in fly ash,while the residual alkalinity of fly ash was significantly reduced because the SOx produced by mixing sludge consumed alkaline agents,leading to the low leaching pH of 5.27.The corresponding leaching concentration of heavy metals such as Pb and Cd was much higher than the limits of GB 16889-2008 Standard for Pollution Control on the Landfill Site of Municipal Solid Waste.Addition of 10%limestone into fly ash could increased the residual alkalinity,indicated by a higher leaching pH of 6.32 and the leaching concentrations of Pb,Zn,Cd,As were lower than the limits of GB 16889—2008.While mixing the sludge,the amount of deacidification agent feed into the flue gas purification system was suggested to be flexibly adjusted,which would contribute to the leaching stability of fly ash.

关 键 词：垃圾焚烧 污泥协同掺烧 飞灰 重金属浸出 

分 类 号：X799.3[环境科学与工程—环境工程]