| 基于剩余污泥的超声法提取微生物絮凝剂 |
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| 引用本文： | 张艳君,张志强,戴晓晴,王春晖,夏四清.基于剩余污泥的超声法提取微生物絮凝剂[J].环境工程学报,2012,6(3):1030-1034. |
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| 作者姓名： | 张艳君 张志强 戴晓晴 王春晖 夏四清 |
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| 作者单位： | 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,长江水环境教育部重点实验室,上海200092 |
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| 基金项目： | 国家自然科学基金资助项目（51008218）；中央高校基本科研业务费专项资金资助项目；国家大学生创新实验计划项目（091024714） |
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| 摘 要： | 通过超声系列实验,对超声法从剩余污泥中提取微生物絮凝剂(MBF)进行了系统研究。从剩余污泥中提取的MBF在碱性条件下表现出较好的絮凝活性。提高污泥浓度有利于提取出较高絮凝活性的MBF。由于超声波的破解作用,超声频率或功率过高均不利于MBF的提取。在20 kHz的超声频率下,连续超声比脉冲为1、4或8 s超声时的提取效果均要好。经过工艺优化,采用20 kHz、120 W的超声波对剩余污泥(19.4 g/L)连续超声30 s,所提取的MBF对高岭土悬浊液的絮凝率接近70%。结果表明,超声法可用于从剩余污泥中直接提取MBF,在降低MBF生产成本的同时实现污泥的资源化利用。
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| 关 键 词： | 剩余污泥 微生物絮凝剂 超声法 絮凝率 |
| 收稿时间： | 9/6/2010 12:00:00 AM |
Extraction of microbial flocculant from waste sludge by ultrasonic method |
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| Zhang Yanjun,Zhang Zhiqiang,Dai Xiaoqing,Wang Chunhui and Xia Siqing.Extraction of microbial flocculant from waste sludge by ultrasonic method[J].Techniques and Equipment for Environmental Pollution Control,2012,6(3):1030-1034. |
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| Authors: | Zhang Yanjun Zhang Zhiqiang Dai Xiaoqing Wang Chunhui and Xia Siqing |
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| Institution: | Zhang Yanjun Zhang Zhiqiang Dai Xiaoqing Wang Chunhui Xia Siqing(State Key Laboratory of Pollution Control and Resource Reuse,Key Laboratory of Yangtze River Water Environment of Ministry of Education,College of Environmental Science and Engineering, Tongji University,Shanghai 200092,China) |
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| Abstract: | The extraction of microbial flocculant(MBF) from waste sludge by ultrasonic method was systematically investigated in the present study.The MBF extracted from the sludge showed higher flocculation efficiency under alkaline conditions than that under neutral or acid conditions.Increasing the sludge concentration enhanced the flocculation efficiency of the extracted MBF.High ultrasonic frequency or high ultrasonic power caused adverse effects on the MBF extraction because of the crack role of ultrasound.Extraction efficiency with continuous ultrasonic was higher than that with 1 s,4 s or 8 s under ultrasonic frequency of 20 kHz.Under the ultrasonic treatment conditions of frequency of 20 kHz,power of 120 W,and continuous ultrasonic time of 30 s,the flocculation efficiency of the MBF extracted from waste sludge(19.4 g/L) for kaolin suspension was close to 70%.Therefore,ultrasonic method is feasible to extract MBF from waste sludge,which facilitates the resource utilization of waste sludge other than decreasing the cost of MBF production. |
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| Keywords: | waste sludge microbial flocculant ultrasonic method flocculation efficiency |
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