Effect of vermicomposting on concentration and speciation of heavy metals in sewage sludge with additive materials
Effect of vermicomposting on concentration and speciation of heavy metals in sewage sludge with additive materials
复制标题
蚯蚓堆肥对添加材料污泥中重金属浓度和形态的影响
DOI：
10.1016/j.biortech.2016.07.045
复制
发表时间：
2016-10-01
影响因子：
11.4
通讯作者：
Li, Meirong
中科院分区：
文献类型：
--
作者：
He, Xin;Zhang, Yaxin;Li, Meirong
研究了蚯蚓对污泥进行蚯蚓堆肥过程中，不同添加物（土壤、秸秆、粉煤灰和锯末）对污泥中重金属（As、Cr、Cd、Cu、Fe、Mn、Ni、Pb和Zn）含量和形态的影响。结果表明，堆肥-蚯蚓堆肥联合处理降低了土壤pH值、总有机碳含量，提高了土壤电导率和发芽指数。投加膨胀剂可加速污泥的稳定化，消除其毒性。蚯蚓堆肥后的重金属总量在10种情况下，降低与初始值和对照没有修改。BCR连续提取表明，蚯蚓堆肥显着降低了所有重金属的流动性，通过增加残留馏分。在污泥处理过程中，蚯蚓的活动和适当添加改良材料对重金属的螯合起到了积极的作用。(C)2016爱思唯尔有限公司版权所有
The aim of this work was to evaluate the total content and speciation of heavy metals (As, Cr, Cd, Cu, Fe, Mn, Ni, Pb and Zn) during vermicomposting of sewage sludge by Eisenia fetida earthworm with different additive materials (soil, straw, fly ash and sawdust). Results showed that the pH, total organic carbon were reduced, while the electric conductivity and germination index increased after a combined composting - vermicomposting process. The addition of bulking agents accelerated the stabilization of sludge and eliminated its toxicity. The total heavy metals after vermicomposting in 10 scenarios were lowered as compared with the initial values and the control without amendment. BCR sequential extraction indicated that vermicomposting significantly decreased the mobility of all heavy metals by increasing the residual fractions. The activity of earthworms and appropriate addition of amendment materials played a positive role in sequestering heavy metals during the treatment of sewage sludge. (C) 2016 Elsevier Ltd. All rights reserved.