| Changes of Cu, Zn, and Ni chemical speciation in sewage sludge co-composted with sodium sulfide and lime |
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| 作者姓名： | WANG Xuejiang CHEN Ling XIA Siqing ZHAO Jianfu |
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| 作者单位： | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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| 基金项目： | 教育部跨世纪优秀人才培养计划，教育部高等学校博士学科点专项科研基金，Guangda Environment Protection Innovative Funds |
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| 摘 要： | A batch composting study was performed to evaluate the feasibility of co-composting sewage sludge with sodium sulfide and lime （SSL） mixture （Na2S/CaO= 1：1）, aiming at reducing the availability of heavy metals in the sludge compost. Sewage sludge with sawdust as a bulking agent was amended with SSL at 3% （w/w, dw）, and composted for 15 d in laboratory batch reactors. The four stages of the Tessier sequential extraction method was employed to investigate changes in heavy metal fractions of Cu, Zn, and Ni in sewage sludge composted with SSL. For all the three metals, the mobile fractions, such as, exchangeable and carbonate bound were mainly transformed into low availability fractions （organic matter and sulfide, Fe-Mn oxides bound and residual forms）, and the addition of SSL enhanced this transformation. Therefore, SSL is a suitable material to co-compost with sewage sludge to reduce the availability of heavy metals. According to the cabbage seed germination test, a SSL amendment of ≤3% （w/w, dw） is recommended to co-compost with sewage sludge.
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| 关 键 词： | 污水处理 淤泥 复合堆肥 重金属 硫化钠 石灰 |
| 收稿时间： | 2007-04-13 |
| 修稿时间： | 2007-07-05 |
Changes of Cu, Zn, and Ni chemical speciation in sewage sludge co-composted
with sodium sulfide and lime |
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| WANG Xuejiang,CHEN Ling,XIA Siqing,ZHAO Jianfu.Changes of Cu, Zn, and Ni chemical speciation in sewage sludge co-composted with sodium sulfide and lime[J].Journal of Environmental Sciences,2008,20(2):156-160. |
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| Authors: | WANG Xuejiang CHEN Ling XIA Siqing and ZHAO Jianfu |
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| Institution: | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering,Tongji University, Shanghai 200092, China |
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| Abstract: | A batch composting study was performed to evaluate the feasibility of co-composting sewage sludge with sodium sulfide and lime (SSL) mixture (Na2S/CaO= 1:1), aiming at reducing the availability of heavy metals in the sludge compost. Sewage sludge with sawdust as a bulking agent was amended with SSL at 3% (w/w, dw), and composted for 15 d in laboratory batch reactors. The four stages of the Tessier sequential extraction method was employed to investigate changes in heavy metal fractions of Cu, Zn, and Ni in sewage sludge composted with SSL. For all the three metals, the mobile fractions, such as, exchangeable and carbonate bound were mainly transformed into low availability fractions (organic matter and sulfide, Fe-Mn oxides bound and residual forms), and the addition of SSL enhanced this transformation. Therefore, SSL is a suitable material to co-compost with sewage sludge to reduce the availability of heavy metals. According to the cabbage seed germination test, a SSL amendment of ≤3% (w/w, dw) is recommended to co-compost with sewage sludge. |
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| Keywords: | sewage sludge co-composting heavy metals sequential extraction |
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