| 污泥生物沥滤工艺优化和重金属分配研究 |
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| 引用本文： | 张军,张征世,杨慧萍,王敦球.污泥生物沥滤工艺优化和重金属分配研究[J].环境工程学报,2014,8(4):1625-1630. |
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| 作者姓名： | 张军 张征世 杨慧萍 王敦球 |
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| 作者单位： | 1. 桂林理工大学, 广西矿冶与环境科学实验中心, 桂林 541004;2. 桂林理工大学环境科学与工程学院, 桂林 541004;3. 广西环境污染控制理论与技术重点实验室, 桂林 541004;1. 桂林理工大学, 广西矿冶与环境科学实验中心, 桂林 541004;2. 桂林理工大学环境科学与工程学院, 桂林 541004;3. 广西环境污染控制理论与技术重点实验室, 桂林 541004;1. 桂林理工大学, 广西矿冶与环境科学实验中心, 桂林 541004;2. 桂林理工大学环境科学与工程学院, 桂林 541004;3. 广西环境污染控制理论与技术重点实验室, 桂林 541004;1. 桂林理工大学, 广西矿冶与环境科学实验中心, 桂林 541004;2. 桂林理工大学环境科学与工程学院, 桂林 541004;3. 广西环境污染控制理论与技术重点实验室, 桂林 541004 |
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| 基金项目： | 广西矿冶与环境科学实验中心项目资助（KH2012-ZD004）；国家自然科学基金资助项目（41161075）；广西“八桂学者”建设工程专项经费项目；广西科学研究与技术开发计划项目（桂科攻11107021-6-1） |
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| 摘 要： | 为了得到嗜酸硫细菌沥滤污泥中重金属的最佳工艺参数,对沥滤过程进行3因素4水平的正交实验研究。3种影响因素的水平设置分别为:污泥浓度35、25、15和5 g/L,单质硫投加量15、10、5和1 g/L,接种量15、10、5和3 g/L。对沥滤过程污泥中7种重金属(As、Cd、Cr、Cu、Ni、Pb和Zn)的去除率进行极差分析,提出了因素影响程度依次为单质硫投加量污泥浓度接种量,且最佳工艺条件为:污泥浓度25 g/L,单质硫投加量10 g/L,接种量为5%。采用超声波-离心方法,分步提取污泥胞外聚合物(EPS)的2种形态:松散结合态(LB)和紧密结合态(TB)。分析其中的重金属浓度,提出沥滤后重金属在污泥EPS的赋存以LB为主。
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| 关 键 词： | 生物沥滤 城市污泥 重金属 正交实验 胞外聚合物 |
| 收稿时间： | 3/9/2013 12:00:00 AM |
Optimization of bioleaching process and distribution of heavy metals in final sewage sludge |
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| Zhang Jun,Zhang Zhengshi,Yang Huiping and Wang Dunqiu.Optimization of bioleaching process and distribution of heavy metals in final sewage sludge[J].Techniques and Equipment for Environmental Pollution Control,2014,8(4):1625-1630. |
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| Authors: | Zhang Jun Zhang Zhengshi Yang Huiping and Wang Dunqiu |
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| Institution: | 1. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541004, China;2. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China;1. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541004, China;2. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China;1. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541004, China;2. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China;1. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541004, China;2. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China |
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| Abstract: | The orthogonal experimental design was used to study the influence of bioleaching parameters on the removal of seven heavy metals (As,Cd,Cr,Cu,Ni,Pb and Zn) in sewage sludge.The orthogonal matrix L16(4)5 and range analysis technique were employed to optimize the bioleaching parameters.These levels were as follows,sewage sludge concentrations of 35,25,15 and 5 g/L,element sulfur dosages of 15,10,5 and 1 g/L,inoculation rates of 15%,10%,5% and 3%.The experimental results indicate that the main factor is element sulfur,and then followed by sewage sludge concentration and inoculation rate.The results of parameter optimization are sewage sludge of 25 g/L,sulfur element of 10 g/L and inoculation rate of 5%.The ultrasonic-centrifugation method was used to separate the loosely bound (LB) extracellular polymeric substances (EPS) and tightly-bound (TB),and the average concentration of each heavy metal in LB EPS is more than that in TB EPS. |
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| Keywords: | bioleaching sewage sludge heavy metal orthogonal experiment extracellular polymeric substances |
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