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首页> 外文期刊>Chemosphere >Generation behavior of extracellular polymeric substances and its correlation with extraction efficiency of valuable metals and change of process parameters during bioleaching of spent petroleum catalyst
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Generation behavior of extracellular polymeric substances and its correlation with extraction efficiency of valuable metals and change of process parameters during bioleaching of spent petroleum catalyst

机译：细胞外聚合物物质的生成行为及其与有价值金属提取效率的相关性及废石油催化剂生物浸润过程中的工艺参数变化

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摘要

The vital functions of extracellular polymeric substances (EPS) have been well recognized in bioleaching of sulfide ores. However, no report is available about the role of EPS in bioleaching of spent catalyst. To completely and deeply understand the functions of EPS in bioleaching of spent catalyst, the generation behavior of EPS at various pulp densities during bioleaching was characterized by three-dimensional excitation-emission matrix (3DEEM), and its relevance with bioleaching performance and process parameters were analyzed using mathematical means. The results showed that the EPS contain humus-like substances as main component (70%) and protein-like substances as minor component (30%). Both total EPS and humus-like substances mainly keep growing over the whole duration of bioleaching at low pulp density of 5.0% or lower; whereas total EPS and humus-like fraction keep declining at high pulp density of 7.5% or higher. Among the total EPS and its components, humus-like substances only have a positive significant correlation with bioleaching efficiencies of both Co and Mo and affect bioleaching process more greatly due to greater correlation coefficient. Biofilm appears at the spent catalyst surface under 2.5% of pulp density mediated by EPS while no biofilm occurs at 10% of pulp density due to shortage of EPS, accounting for the great difference in bioleaching efficiencies between high and low pulp densities which are 48.3% for Mo and 50.0% for Co at 10% of pulp density as well as 75.9% for Mo and 78.8% for Co at 2.5% of pulp density, respectively. (C) 2021 Elsevier Ltd. All rights reserved.
机译：细胞外聚合物物质（EPS）的重要功能在硫化物矿石的生物浸出中得到了很好的认识。但是，没有报告EPS在废催化剂的生物浸出中的作用。为了完全和深刻地理解EPS在废催化剂的生物浸出中，通过三维激发 - 发射矩阵（3DEEME）在生物浸出过程中各种纸浆密度处的EPS的产生行为，其与生物浸出性能和工艺参数的相关性使用数学手段进行分析。结果表明，EPS含有类似腐殖质的物质，作为主要成分（＆ 70％）和蛋白质物质，作为次要成分（<30％）。总EPS和腐殖质的物质均主要在低纸浆密度为5.0％或更低的情况下在整个生物浸出的整个持续时间内延长;虽然总EPS和腐殖质的分数保持下降，但高纸浆密度为7.5％或更高。在总EPS及其组分中，腐殖质的物质仅具有与CO和MO的生物浸出效率具有正显着的相关性，并且由于更高的相关系数，更大地影响生物浸入过程。生物膜出现在由EPS介导的2.5％的纸浆密度下的废催化剂表面上，而由于EPS短缺，没有生物膜在纸浆密度的10％下发生，占高低浆密度之间的生物浸出效率的巨大差异，这是48.3％对于MO和50.0％的CO，纸浆密度的10％，MO的75.9％，CO的78.8％分别为纸浆密度的2.5％。 （c）2021 elestvier有限公司保留所有权利。

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  • 来源
    《Chemosphere》 |2021年第7期|130006.1-130006.10|共10页
  • 作者

    Chu Huichao; Wang Jia; Tian Bingyang; Qian Can; Niu Tianqi; Qi Shiyue; Yang Yiran; Ge Yajun; Dai Xiaodong; Xin Baoping;

  • 作者单位

    Beijing Inst Technol Sch Mat Beijing 100081 Peoples R China;

    Beijing Univ Civil Engn & Architecture Coll Environm & Energy Engn Beijing 100080 Peoples R China;

    Beijing Inst Technol Sch Mat Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mat Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mat Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mat Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mat Beijing 100081 Peoples R China;

    Beijing Capt Environm Technol Co Ltd Beijing 100060 Peoples R China;

    Beijing Capt Environm Technol Co Ltd Beijing 100060 Peoples R China;

    Beijing Inst Technol Sch Mat Beijing 100081 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《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bioleaching; Extracellular polymeric substances; Generation behavior; Spent catalyst; Recovery of valuable metals;

    机译：生物浸入;细胞外聚合物物质;生成行为;催化剂;回收有价值的金属;

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