DOC《Fenton预处理对城市污泥重金属形态及生物淋滤溶出影响》

Fenton预处理对城市污泥重金属形态及生物淋滤溶出影响 于贺1,邱春生1,2,*,王晨晨1,2,节剑勇3,孙力平1,2,骆尚廉4,王少坡1,2,郑剑锋1,2 1.

天津城建大学环境与市政工程学院,天津

300384 天津市水质科学与技术重点实验室,天津

300384 河南省建筑设计研究院有限公司,郑州

450014 台湾大学环境工程学研究所,台北

10673 第一作者:于贺(1993―),女,硕士研究生.研究方向:废弃物资源化.E-mail:[email protected] *通信作者:邱春生(1984―),男,博士,副教授.研究方向:废弃物资源化.E-mail:[email protected] 基金项目:国家自然科学基金资助项目(51478291);

国家科技重大专项(2017ZX07106001);

天津市自然科学基金资助项目(17JCTPJC51400) 收稿日期: 2018-08-26;

录用日期:2018-12-27 DOI 10.12030/j.cjee.201808165 中图分类号 X705 文献标识码 A 摘要针对生物淋滤处理城市污泥重金属Cr、As和Pd的溶出效率较低的问题,采用芬顿(Fenton)氧化法对城市污泥进行预处理,考察Fenton氧化对污泥中重金属Cr、As和Pd赋存形态转化及后继生物淋滤过程溶出率的影响.实验结果表明,经pH=4.

00、Fe2+=1.00 g・L-

1、H2O2=9 g・L-1的条件下Fenton预处理后,重金属Cr、As和Pb的存在形态均由稳定性较强的可氧化态和残渣态向不稳定的弱酸提取态和可还原态转化,其不稳定态比重分别由15%、30%、9%提高到了24%、41%、11%;

生物淋滤实验结果显示,由于重金属形态变化,重金属Cr、As和Pb溶出率分别由52.71%、11.15%、33.19%提升至60.76%、24.32%、45.96%.Fenton预处理联合生物淋滤法提高了对重金属Cr、As和Pb的去除效果,有助于实现污泥的无害化处理处置. 关键词 城市污泥;

生物淋滤;

Fenton氧化;

重金属形态 Influence of Fenton pretreatment on distribution and bioleaching efficiency of heavy metal in municipal sludge YU He1, QIU Chunsheng1,2,*, WANG Chenchen1,2, JIE Jianyong3, SUN Liping1,2, LUO Shanglian4, WANG Shaopo1,2, ZHENG Jianfeng1,2 1. School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China 2. Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin 300384, China 3. Architectural Design and Research Institute of Henan Province Co.Ltd., Zhengzhou 450014, China 4. Graduate Institute of Environmental Engineering, Taiwan University, Taipei 10673, China * Corresponding author, E-mail: [email protected] Abstract In order to improve the low dissolution efficiency of heavy metals (Cr, As and Pd) in municipal sludge treated by bioleaching, Fenton oxidation was applied to pretreat the municipal sludge. The effects of Fenton oxidation on the distribution of heavy metals Cr, As and Pd in the sludge and the dissolution efficiency of the heavy metals in subsequent bioleaching were investigated. The results of pretreatment experiments showed that after the Fenton pretreatment under the conditions of pH=4.00, Fe2+=1.00 g・L-1 and H2O2=9 g・L-1, the speciation of heavy metals Cr, As and Pb were partly transformed from the stable oxidized states and residual state into the unstable acid extractable state and reducible state. And the unstable morphological gravity of Cr, As and Pb increased from 15%,30% and 9% to 24%, 41% and 11%, respectively. The results of bioleaching experiments showed that the dissolution rate of Cr, As and Pb increased from 52.71%, 11.15% and 33.19% to 60.76%, 24.32% and 45.96%, respectively, due to the morphological changes of heavy metals. Fenton pretreatment combined with bioleaching can improve the removal efficiency of Cr, As and Pb, and contribute to achieve the harmless treatment and disposal of sewage sludge. Keywords sewage sludge;