污泥生物炭在污泥好氧降解中的原位应用  

In-situ application of sludge-derived biochar in aerobic biodegradation of sludge

作　　者：余琴芳 吕凡[1,2] 於进[1,2] 章骅[1,2] 邵立明[2,3] 何品晶[2,3] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092 [2]同济大学固体废物处理与资源化研究所,上海200092 [3]住房和城乡建设部村镇建设司农村生活垃圾处理技术研究与培训中心,上海200092

出　　处：《中国环境科学》2016年第6期1794-1801,共8页China Environmental Science

基　　金：国家863高技术研究发展计划课题(2012AA063504);2015年度国家环境保护标准项目(2015-4);上海市2014年度"科技创新行动计划"技术标准项目(14DZ0501500)

摘　　要：在300,500,700℃下热解获得的污泥生物炭C300、C500和C700,分别添加至污泥中进行好氧降解反应,研究降解过程中污泥性质的变化,及反应前后污泥生物炭重金属含量的变化.结果表明,添加污泥生物炭提高了污泥降解产物的稳定性,降低了污泥中重金属的生物有效性.添加C300的产物稳定性最高、重金属生物有效性最低,相比对照工况,其产物的5日耗氧量降低了27%,Cu、Zn、As和Ni的生物有效性分别降低了24%、15%、26%和19%.反应后C300和C500中水溶性重金属含量没有显著变化,而C700中水溶性Cu、Zn和Ni的含量分别增加了16,94,4mg/kg.C300作为污泥好氧降解添加剂经济可行.Three biochar samples were produced by pyrolysis of sewage sludge at the temperatures of 300, 500and 700℃, named as C300, C500and C700, respectively. The C300, C500and C700samples were separately mixed into sewage sludge for aerobic biodegradation, during which the variation of sludge properties was investigated, and the change of heavy metals in the biochars before and after reaction was studied. Results showed that the addition of sludge-derived biochar improved the stability of the products and reduced the bioavailability of heavy metals in the sludges. The most stable product sludge and the lowest bioavailability of heavy metals in the sludge were obtained in the trial with C300, for which the five-day oxygen consumption of the product sludge was 27% lower than that of the control, and the bioavailable contents of Cu, Zn, As and Ni were 24%, 15%, 26% and 19% lower than those of the control, respectively. The contents of water-soluble heavy metals in C300and C500before and after reaction were similar, while the water-soluble Cu, Zn and Ni in C700increased by 16mg/kg, 94mg/kg and 4mg/kg after reaction, respectively. In conclusion, adding C300 to sludge for aerobic biodegradation was recommended.

关 键 词：污泥降解 污泥生物炭 热解温度 稳定性 重金属 生物有效性 

分 类 号：X705[环境科学与工程—环境工程]