李氏禾生物炭对重金属污染尾矿砂中铅、锌和砷形态转化的影响  

EFFECT OF BIOCHAR OF LEERSIA HEXANDRA SWARTZ ON FRACTION TRANSFORMATION OF Pb,Zn AND As IN HEAVY METAL CONTAMINATED MINE TAILINGS

作　　者：吴炽珊 张杏锋[1,2] 高波[1,2] 田超[1,2] 王建生 

机构地区：[1]桂林理工大学环境科学与工程学院广西环境污染控制理论与技术重点实验室,广西桂林541004 [2]桂林理工大学广西岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004

出　　处：《环境工程》2018年第1期183-187,133,共6页Environmental Engineering

基　　金：广西科学研究与技术开发项目(桂科转1599001-1;桂科重14124001-4);"八桂学者"建设工程专项经费;广西危险废物处置产业化人才小高地

摘　　要：以广西河池市某废弃铅锌矿区的尾砂为研究对象,选用李氏禾生物炭为修复材料,采用BCR连续提取法,探讨生物炭对尾矿砂重金属的钝化效果。结果显示:生物炭对尾矿砂中Pb和Zn的形态转化产生了显著影响,钝化效果Pb>Zn>As。对于Pb、Zn添加生物炭能显著降低尾矿砂中其弱酸提取态含量,有效降低可还原态含量,同时能显著增加Pb和Zn的残渣态含量,并增加Pb和Zn的可氧化态,但并不显著。对于As而言,生物炭添加量为0.4%和0.8%的处理可明显降低其弱酸提取态含量,As的可还原态及残渣态含量均随生物炭添加量增加呈现逐渐增大趋势,可氧化态并无明显变化。生物炭对尾矿砂中的Pb和Zn具有良好的钝化效果,可促进Pb、Zn的弱酸提取态向残渣态转化,降低其在尾矿砂中的迁移性和生物有效性,且0.2%、0.4%的处理钝化效果最佳。In order to study the remediation technology for mine tailing,samples from scrap mine in Hechi in Guangxi,was chosen as the object.Biochar derived from Leersia hexandra Swartz was added to the mine tailing.BCR sequential extraction method was used to assess the passivating of heavy metal.The results showed that biochar had a significant effect on the fraction transformation of Pb and Zn in the tailings.The passivation effect of biochar on Pb,Zn,and As was decreased in turn.Biochar treatment significantly decreased the acid extractable content of Pb and Zn,while reducible content was gradually decreased.Biochar could also significantly increase the residual content of Pb and Zn,and their oxidizable speciation was effectively increased.For As,the 0.4% and 0.8%（dosage of birchar） treatments could significantly reduce the content of acid extractable state.The reducible and residual content increased gradually with the biochar addition,but there was no obvious change in the oxidizable state.The results indicated that the application of biochar could stimulate Pb and Zn change from acid extractable content to the residual content,thus reducing the mobilization of the two elements.For the stabilization effect,0.2% and 0.4%（dosage of biochar） treatments worked best.

关 键 词：生物炭 重金属 尾矿砂 BCR连续提取法 

分 类 号：X131.3[环境科学与工程—环境科学]