• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Effective multi-metal removal from plant incineration ash via the combination of bioleaching and brine leaching
【24h】

Effective multi-metal removal from plant incineration ash via the combination of bioleaching and brine leaching

机译：通过生物浸出和盐水浸出的组合，从植物焚烧灰分中取出有效的多金属去除

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Plant incineration ash is the final product from the remediation of multi-metal contaminated soils by the phytoextraction process. The content of heavy metals in plant ash was found to be higher than the regulatory criteria and it was thus classified as hazardous waste. So far, no eco-friendly and cost-effective technology has been developed for the management of this residue. Herein, a cleaner strategy of bioleaching combined with brine leaching of multi-metals from plant ash was developed. The bioleaching results indicated that 88.7% (Zn), 93.2% (Cd), 99.9% (Mn) and 13.8% (Pb) were achieved under optimum conditions of Fe(ii) concentration 6.0 g L-1, pH 1.8 and pulp density 15% (w/v). Subsequently, the introduction of brine leaching using 200 g L-1 NaCl significantly increased Pb recovery to 70.6% under conditions of 15% (w/v) pulp density, thereby ultimately achieving deep recovery of all metals. An investigation of the mechanism revealed that H+ attack and microorganisms were the dominant mechanism for bioleaching of Zn, Cd and Mn, and the bioleaching kinetics of Zn in ash were controlled by interface mass transfer and diffusion across the product layer. Risk assessment tests indicated that the leached residues could pass the TCLP test standard and be safely reused as nonhazardous materials. These findings demonstrated that the two-stage leaching strategy was feasible and promising for multi-metal removal from plant ash.
机译：植物焚烧灰是由植物萃取过程中修复多金属污染土壤的最终产品。发现植物灰中重金属的含量高于调节标准，因此被归类为危险废物。到目前为止，没有为该残留物的管理制定了生态友好且经济高效的技术。在此，开发了一种与植物灰盐水浸出的生物浸出的清洁剂策略。在Fe（II）浓度6.0g L-1，pH 1.8和纸浆密度的最佳条件下，在58.7％（Zn），93.2％（Mn），99.9％（Mn）和13.8％（Pb）下实现了88.7％（Zn），99.9％（Mn）和13.8％（Pb） 15％（w / v）。随后，在15％（w / v）纸浆密度的条件下，使用200g L-1 NaCl的盐水浸出的引入显着增加至70.6％，从而最终实现所有金属的深度恢复。对该机制的研究表明，H +攻击和微生物是Zn，Cd和Mn的生物浸出的主要机制，并且通过界面质量传递和在产物层上扩散来控制Zn中的Zn的生物浸出动力学。风险评估测试表明，浸出的残留物可以通过TCLP测试标准，并安全地重复使用为非危害材料。这些研究结果表明，两级浸出策略是可行的，并且对植物灰的多金属去除有望。

著录项

  • 来源
    《RSC Advances》 |2020年第3期|共12页
  • 作者

    Li Su; Tian Zhuang; Liu Ronghui; Zhou Wenbo; Cheng Haina; Sun Jianxing; Zhao Kaifang; Wang Yuguang; Zhou Hongbo;

  • 作者单位

    Cent S Univ Sch Minerals Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

    Cent S Univ Sch Minerals Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

    Cent S Univ Sch Minerals Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

    Cent S Univ Sch Minerals Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

    Cent S Univ Sch Minerals Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

    Cent S Univ Sch Minerals Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

    Dongguan Kecheng Environm Technol Co Ltd Dongguan 523899 Peoples R China;

    Cent S Univ Sch Minerals Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

    Cent S Univ Sch Minerals Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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