城市污泥热解过程中重金属的形态转化模拟研究  

Simulation on speciation transformation of heavy metals in the sewage sludge during pyrolysis

作　　者：张双全[1] 周家珍[1] 李静云[1] 王壬峰[1] 杨忠福 贺彬艳 李鹏 

机构地区：[1]中国矿业大学煤炭加工与高效洁净利用教育部重点实验室,江苏徐州221116 [2]神华宁夏煤业集团太西炭基工业有限公司,宁夏石嘴山753000 [3]神华宁夏煤业集团太西炭基工业有限公司活性炭分公司,宁夏石嘴山753000

出　　处：《中国矿业大学学报》2012年第6期959-963,共5页Journal of China University of Mining & Technology

基　　金：江苏省自然科学基金项目(BK2009097)

摘　　要：利用重金属Cd,Cu,Zn和Pb的碳酸盐、可溶性盐(如硫酸盐、硝酸盐、氯化盐)或硫化物作为污泥中重金属的模拟化合物,在不同条件下对模拟化合物进行热解.通过对热解产物进行X-射线衍射分析,确定产物的组成,从而推断污泥热解时重金属的形态变化过程.结果表明:Cd的碳酸盐热解过程中向更加稳定的CdS发生转变;Cu的碳酸盐和硫化物生成Cu2S;Zn的离子交换态和Pb的碳酸盐与离子交换态热解之后均生成相应的氧化物和硫化物.Carbonates, soluble salts and sulfides of Cd, Cu,Zn and Pb were used as model com- pounds in sewage sludge, which were pyrolyzed together with sewage sludge under different conditions. The pyrolysis products of the model compounds were analysed by a X-ray diffrac- tion（XRD） to investigate the speciation transformation mechanism of the heavy metals. The results show that the cadmium carbonate transforms into CdS which is more stable. The car- bonate and sulfide of copper form Cu2S. The exchangeable state of Zn, carbonates and ex- changeable state of Pb produce corresponding oxides and sulfides during pyrolysis.

关 键 词：城市污泥 热解 重金属 形态 

分 类 号：X705[环境科学与工程—环境工程]