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Effects of wood vinegar on properties and mechanism of heavy metal competitive adsorption on secondary fermentation based composts

机译：木醋液对二次发酵堆肥中重金属竞争性吸附特性及机理的影响

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摘要

In this study, secondary municipal solid waste composts (SC) and wood vinegar treated secondary compost (WV-SC) was prepared to investigate the capability for single-heavy metals and multi-metal systems adsorption. The adsorption sequence of WV-SC for the maximum single metals sorption capacities was Cd (42.7 mg g(-1)) Cu (38.6 mg g(-1)) Zn (34.9 mg g(-1)) Ni (28.7 mg g(-1)) and showed higher than that of SC adsorption isotherm. In binary/quaternary-metal systems, Ni adsorption showed a stronger inhibitory effect compared with Zn, Cd and Cu on both SC and WV-SC. According to Freundlich and Langmuir adsorption isotherm models, as well as desorption behaviors and speciation analysis of heavy metals, competitive adsorption behaviors were differed from single-metal adsorption. Especially, the three-dimensional simulation of competitive adsorption indicated that the Ni was easily exchanged and desorbed. The amount of exchangeable heavy metal fraction were in the lowest level for the metal-loaded adsorbents, composting treated by wood vinegar improved the adsorbed metals converted to the residue fraction. This was an essential start in estimating the multiple heavy metal adsorption behaviors of secondary composts, the results proved that wood vinegar was an effective additive to improve the composts quality and decrease the metal toxicity.
机译：在这项研究中，准备了城市生活垃圾二次堆肥（SC）和经木醋处理的二次堆肥（WV-SC），以研究单重金属和多金属系统的吸附能力。 WV-SC的最大单金属吸附容量吸附顺序为Cd（42.7 mg g（-1））> Cu（38.6 mg g（-1））> Zn（34.9 mg g（-1））> Ni（ 28.7 mg g（-1）），并且显示出比SC吸附等温线更高。在二元/四元金属体系中，与Zn，Cd和Cu相比，Ni对SC和WV-SC的吸附表现出更强的抑制作用。根据Freundlich和Langmuir的吸附等温线模型，以及重金属的解吸行为和形态分析，竞争性吸附行为不同于单金属吸附。特别是，竞争吸附的三维模拟表明，镍易于交换和解吸。对于负载金属的吸附剂，可交换的重金属部分的含量最低，木醋处理的堆肥提高了吸附金属转化为残留部分的能力。这是估算次生堆肥对多种重金属的吸附行为的重要开端，结果证明木醋液是提高堆肥质量并降低金属毒性的有效添加剂。

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  • 来源
    《Ecotoxicology and Environmental Safety》 |2018年第4期|270-279|共10页
  • 作者

    Liu Ling; Guo Xiaoping; Wang Shuqi; Li Lei; Zeng Yang; Liu Guanhong;

  • 作者单位

    Beijing Forestry Univ, Coll Soil & Water Conservat, Beijing 100083, Peoples R China;

    Beijing Forestry Univ, Coll Soil & Water Conservat, Beijing 100083, Peoples R China;

    Tianjin LVYIN Landscape & Ecol Construct Co Ltd, Tianjin 300384, Peoples R China;

    Beijing Forestry Univ, Coll Soil & Water Conservat, Beijing 100083, Peoples R China;

    Beijing Forestry Univ, Coll Soil & Water Conservat, Beijing 100083, Peoples R China;

    Beijing Forestry Univ, Coll Soil & Water Conservat, Beijing 100083, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);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

    Wood vinegar; Secondary compost; Competitive adsorption; Adsorption Isotherms; Heavy metal speciation;

    机译：木醋;二次堆肥;竞争性吸附;吸附等温线;重金属形态;

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