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不同深度脱水污泥的热解特性及动力学分析

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张强, 邢智炜, 刘欢, 罗光前, 姚洪. 不同深度脱水污泥的热解特性及动力学分析[J]. 环境化学, 2013, 32(5): 839-846. doi: 10.7524/j.issn.0254-6108.2013.05.017
引用本文: 张强, 邢智炜, 刘欢, 罗光前, 姚洪. 不同深度脱水污泥的热解特性及动力学分析[J]. 环境化学, 2013, 32(5): 839-846. doi: 10.7524/j.issn.0254-6108.2013.05.017
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ZHANG Qiang, XING Zhiwei, LIU Huan, LUO Guangqian, YAO Hong. Pyrolysis characteristic and kinetic analysis of different deep dewatered sludges[J]. Environmental Chemistry, 2013, 32(5): 839-846. doi: 10.7524/j.issn.0254-6108.2013.05.017
Citation: ZHANG Qiang, XING Zhiwei, LIU Huan, LUO Guangqian, YAO Hong. Pyrolysis characteristic and kinetic analysis of different deep dewatered sludges[J]. Environmental Chemistry, 2013, 32(5): 839-846. doi: 10.7524/j.issn.0254-6108.2013.05.017
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不同深度脱水污泥的热解特性及动力学分析

  • 1.

    华中科技大学,煤燃烧国家重点实验室, 武汉, 430074;

  • 2.

    华中科技大学环境科学与工程学院, 武汉, 430074

  • 基金项目:

    国家自然科学基金(51161140330

    51076053)

    国家重点基础研究(973)(2011CB201500)资助.

Pyrolysis characteristic and kinetic analysis of different deep dewatered sludges

  • 1.

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, 430074, China;

  • 2.

    School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

  • Fund Project:

  • 摘要: 选用4种利于深度脱水的复合调理剂(FeCl3/CaO、FeCl3/CaO /煤粉、芬顿试剂(Fe2+和H2O2组成体系)/CaO、芬顿试剂CaO /煤粉)来改善污泥的脱水性能,所得泥饼的含水率为43.7%—56.1%,满足深度脱水的要求.CaO和煤粉的添加能改变污泥的灰分和挥发分含量.与传统聚丙烯酰胺(PAM)脱水污泥的热重分析对比结果表明,由于复合调理剂对EPS的破坏溶解作用,因此对污泥热解性质有较大影响,不仅能前移水分失重峰,还使得热重主要反应阶段峰个数变少.热解动力学计算表明,反应级数在1—2范围内.表观活化能差异表明4种复合调理剂处理后脱水污泥更容易发生热解反应.
    Abstract: With a rapid increase of the sludge production and a tendency of implementing more rigid laws and regulations, deep dewatering is well needed in order to conduct the follow-up disposals. In this paper, four kinds of conditioners (FeCl3/CaO, FeCl3/CaO/coal fines, Fenton's reagent/CaO, and Fenton's reagent/CaO/coal fines), which are conducive to the performance of sludge dewatering, were selected. The water contents of obtained sludge cakes range from 43.7% to 56.1%, which meets the requirements of deep dewatering. The addition of CaO and coal fines can change the content of ash and volatile of sludge. And compared with the thermogravimetric analysis results of traditional polyacrylamide (PAM) dewatered sludge, composite conditioners have a more significant impact on the thermal decomposition characters of sludge due to their abilities to destroy and dissolve EPS(Extracellular Polymeric Substance). Not only the water loss peak had been moved forward, but also the number of main reaction stage peak of thermo gravimetry had declined. According to the pyrolytic dynamics calculation, the reaction order ranged from 1 to 2. The different apparent activation energy values indicated that the dewatered sludges processed by other four composite conditioners were easier to pyrolyze.
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出版历程
  • 收稿日期:  2012-07-13

不同深度脱水污泥的热解特性及动力学分析

  • 1.  华中科技大学,煤燃烧国家重点实验室, 武汉, 430074;
  • 2.  华中科技大学环境科学与工程学院, 武汉, 430074
  • 收稿日期:  2012-07-13
基金项目:

国家自然科学基金(51161140330

51076053)

国家重点基础研究(973)(2011CB201500)资助.

摘要: 选用4种利于深度脱水的复合调理剂(FeCl3/CaO、FeCl3/CaO /煤粉、芬顿试剂(Fe2+和H2O2组成体系)/CaO、芬顿试剂CaO /煤粉)来改善污泥的脱水性能,所得泥饼的含水率为43.7%—56.1%,满足深度脱水的要求.CaO和煤粉的添加能改变污泥的灰分和挥发分含量.与传统聚丙烯酰胺(PAM)脱水污泥的热重分析对比结果表明,由于复合调理剂对EPS的破坏溶解作用,因此对污泥热解性质有较大影响,不仅能前移水分失重峰,还使得热重主要反应阶段峰个数变少.热解动力学计算表明,反应级数在1—2范围内.表观活化能差异表明4种复合调理剂处理后脱水污泥更容易发生热解反应.

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