| 剩余污泥厌氧消化过程重金属形态转化及生物有效性分析 |
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| 引用本文： | 刘晓光,董滨,戴翎翎,戴晓虎.剩余污泥厌氧消化过程重金属形态转化及生物有效性分析[J].农业环境保护,2012(8):1630-1638. |
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| 作者姓名： | 刘晓光 董滨 戴翎翎 戴晓虎 |
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| 作者单位： | 城市污染控制国家工程研究中心,同济大学环境科学与工程学院,上海200092 |
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| 基金项目： | 国家科技支撑计划课题（2010BAc67804）;国家水体污染控制与治理科技重大专项（2011ZX07316-004）;上海市科委重大项目（10dz2212500） |
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| 摘 要： | 为研究污泥厌氧消化过程中物理化学性质的变化对典型重金属形态转化的影响,对其农用的可行性及生物有效性进行评估,对取自某城市污水处理厂的剩余污泥进行了序批式厌氧消化实验,在试验过程中测定了污泥理化学性质,采用Tessier分步提取法提取了污泥样品中的典型重金属,并采用电感耦合等离子发射光谱仪（ICP-OES）测定各形态重金属含量及总量。结果表明,厌氧消化过程中重金属的形态发生了显著变化,由不稳定态向比较稳定的残渣态和有机结合态转变,某些重金属形态与污泥理化性质如pH、碱度、VS/TS及氨氮显著相关。厌氧消化可以有效地降低污泥中重金属的潜在迁移能力和生物有效性,经厌氧消化后污泥可以更好地进行土地利用。
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| 关 键 词： | 形态分析 重金属 剩余污泥 厌氧消化 |
Analysis of Chemical Speciation and Bioavailability of Heavy Metals in Waste Activated Sludge During Anaerobic Digestion |
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| LIU Xiao-guang,DONG bin,DAI Ling-ling,DAI Xiao-hu.Analysis of Chemical Speciation and Bioavailability of Heavy Metals in Waste Activated Sludge During Anaerobic Digestion[J].Agro-Environmental Protection,2012(8):1630-1638. |
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| Authors: | LIU Xiao-guang DONG bin DAI Ling-ling DAI Xiao-hu |
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| Institution: | (National Engineering Research Center for Urban Pollution Control, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China) |
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| Abstract: | The major limitation of land application of sewage sludge is the total heavy metal contents and their bioavailability to the soil-plant system. This study was conducted to determine the heavy metal speciation and the influence of changing the physical-chemical properties of the medium in the course of anaerobic digestion on the concentrations, bioavailability or chemical forms of Cu, Zn, Cr and Ni in sewage sludge.Principal physical and chemical properties of sewage sludge during anaerobic digestion were investigated. The total metal contents in digested sludge were higher than that in raw sludge but lower than the limit values of land application. Furthermore, it was observed by using Tessier sequential extraction procedure in sludge during anaerobic digestion that heavy metal distribution and bioavailability show some changes depending on the metal itself and the physical-chemical properties of the medium. Bioavailable fractions of all elements tend to de- crease. Cu and Cr present more affinity to organic and residual fractions, while Zn and Ni seem to be preferentially bound to all fractions ex- cept exchangeable. Significant degrees of correlation were found between certain heavy metal fractions and changes of some selected vari- ables（e.g, pH, VS/TS, alkalinity and ammonia） during the course of anaerobic digestion. |
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| Keywords: | chemical speciation analysis heavy metals waste activated sludge anaerobic digestion |
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