...
首页> 外文期刊>Journal of Hazardous Materials >Precipitates in landfill leachate mediated by dissolved organic matters
【24h】

Precipitates in landfill leachate mediated by dissolved organic matters

机译:溶解性有机物介导的垃圾填埋场渗滤液中的沉淀物

获取原文
获取原文并翻译 | 示例
           

摘要

Clogging of landfill leachate collection system is so ubiquitous that it causes problems to landfills. Although precipitations of calcite and other minerals have been widely observed, the mechanism of precipitation remains obscure. We examined the clog composition, dissolved organic matters, leachate chemical compositions and the correlation of these variables in view of the precipitation process. It is shown that Dissolved Organic Carbon (DOC) inhibits precipitation of landfill leachate. Using the advanced NICA-Donnan model, the analysis of aqueous chemical reactions between Mg-Ca-DOC-CO2 suggests a good agreement with experimental observations. Calcite and dolomite are both found to be oversaturated in most of the landfill leachate samples. DOC is found to preferentially bind with Mg than Ca, leading to more likely precipitation of Calcite than dolomite from landfill leachate. The NICA-Donnan model gives a reasonable estimation of dolomite saturation index in a wide range of DOC. Modeling confirms the major precipitation mechanism in terms of alkaline earth metal carbonate. Uncertainties in model parameters are discussed with particular focus on DOC composition, functional group types and density concentration and the influential factors. (C) 2015 Elsevier B.V. All rights reserved.
机译:垃圾填埋场渗滤液收集系统无处不在,以至于给垃圾填埋场造成问题。尽管已经广泛观察到方解石和其他矿物的沉淀,但是沉淀的机理仍然不清楚。考虑到沉淀过程,我们检查了木log的成分,溶解的有机物,渗滤液的化学成分以及这些变量的相关性。结果表明,溶解有机碳(DOC)抑制了垃圾渗滤液的沉淀。使用先进的NICA-Donnan模型,对Mg-Ca-DOC-CO2之间的水化学反应的分析表明与实验观察结果吻合良好。在大多数垃圾渗滤液样品中都发现方解石和白云石都过饱和。发现DOC比Ca优先与Mg结合,从而导致垃圾渗滤液中的方解石比白云石更有可能沉淀。 NICA-Donnan模型可以在各种DOC范围内合理估算白云岩饱和度指数。模拟证实了碱土金属碳酸盐的主要沉淀机理。讨论了模型参数的不确定性,尤其关注DOC组成,官能团类型和密度浓度以及影响因素。 (C)2015 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2015年第28期|278-286|共9页
  • 作者单位

    Chinese Acad Sci, Wuhan Inst Rock & Soil Mech, Wuhan, Peoples R China;

    Chinese Acad Sci, Wuhan Inst Rock & Soil Mech, Wuhan, Peoples R China;

    Chinese Acad Sci, Wuhan Inst Rock & Soil Mech, Wuhan, Peoples R China;

    Chinese Acad Sci, Wuhan Inst Rock & Soil Mech, Wuhan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Clogging; Model; NICA-Donnan; Precipitate; Calcite; Dolomite;

    机译:堵塞;模型;NICA-Donnan;沉淀;方解石;白云石;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号