东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (6): 863-867.DOI: 10.12068/j.issn.1005-3026.2015.06.023

• 资源与土木工程 • 上一篇    下一篇

硫化剂对畜禽粪便中重金属存在形态的影响

刘文刚, 魏德洲, 郭会良, 杨培月   

  1. (东北大学 资源与土木工程学院, 辽宁 沈阳110819)
  • 收稿日期:2014-05-05 修回日期:2014-05-05 出版日期:2015-06-15 发布日期:2015-06-11
  • 通讯作者: 刘文刚
  • 作者简介:刘文刚(1981-),男,山东潍坊人,东北大学副教授,博士生导师; 魏德洲(1956-),男,河南南阳人,东北大学教授,博士生导师.
  • 基金资助:
    水体污染控制与治理科技重大专项(2012ZX07202003);辽宁省科技攻关项目(2009221006).

Effect of Sulfurizing Agents on Speciation of Heavy Metals in Poultry Litter

LIU Wen-gang, WEI De-zhou, GUO Hui-liang, YANG Pei-yue   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2014-05-05 Revised:2014-05-05 Online:2015-06-15 Published:2015-06-11
  • Contact: LIU Wen-gang
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摘要: 基于Tessier五步提取法,通过摇瓶试验考察了硫化钠和乙硫氮两种硫化剂对畜禽粪便中Mn,Zn,Cu和Cr四种重金属存在形态的影响,并探索了硫化剂对重金属离子的固化能力.结果表明,硫化剂的添加能够明显降低畜禽粪便中可交换态和碳酸盐结合态重金属含量,在硫化剂用量为2g/kg时,畜禽粪便中的重金属达到较好的钝化效果.同时,乙硫氮对四种重金属的钝化性能明显好于硫化钠,在弱酸性环境下仍能明显降低可交换态和碳酸盐结合态重金属含量,而硫化钠在中性和碱性环境下对重金属具有较强的钝化能力.分析化学和结构化学研究表明,硫化钠主要通过S2-或其水解产物与重金属发生反应生成难溶化合物而对重金属产生钝化性能;而乙硫氮主要与重金属离子形成稳定的四元螯合物对重金属产生钝化作用.

关键词: 硫化钠, 乙硫氮, 畜禽粪便, 重金属, 存在形态

Abstract: The five step sequential extraction procedure developed by Tessier was used to investigate speciation of the heavy metal(Zn, Cu, Mn, and Cr) in poultry litter when sodium sulfide and sodium diethyldithiocarbamate were added during shake flask test. And the immobilization effects of sulfuring agents on heavy metals had been explored. From the results, it can be seen that with the addition of sulfurizing agents, contents of heavy metals with exchangeable and bound to carbonate speciation in poultry litter were decreased obviously. Preferable immobilization effect can be achieved when sulfuring agent dosage was 2g/kg. Sodium diethyldithiocarbamate have better immobilization effect on four heavy metals than sodium sulfide. When sodium diethyldithiocarbamate was added, contents of heavy metals with exchangeable and bound to carbonate speciation were still decreased evidently in slightly acidic condition. However, better immobilization effect of heavy metals can be obtained in neutral or alkaline environment when sodium sulfide was used as immobilizing agent. Analytical chemistry and structural chemistry analysis demonstrated that, when sodium sulfide was used as immobilizing agent, precipitation reaction may occur between sulfur ion(or its hydrolysis product) and heavy metal ions. Nevertheless, sodium diethyldithiocarbamate can immobilize heavy metals by the formation of stable four-membered ring chelates.

Key words: sodium sulfide, sodium diethyldithiocarbamate, poultry litter, heavy metals, speciation

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