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A novel biological sulfur reduction process for mercury-contaminated wastewater treatment

机译：一种新型的生物还原硫处理工艺，用于处理汞污染的废水

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摘要

The sulfidogenic process driven by sulfate-reducing bacteria (SRB) is not suitable for mercury-contaminated wastewater treatment due to the highly toxic methyl-mercury (MeHg) produced by SRB. In our previous study, we observed in short-term batch tests that sulfur-reducing bacteria ((SRB)-R-0) could remove mercury ions without MeHg production. Thus, the aim of this study is to develop a biological sulfur reduction process driven by (SRB)-R-0 for mercury-contaminated wastewater, and investigate its long-term performance on mercury removal and MeHg accumulation. Receiving mercury-contaminated wastewater containing 0-50 mg Hg(II)/L for 326 days, (SRB)-R-0 in the sulfur-reducing bioreactor showed high tolerance with mercury toxicity, and removed 99.4% +/- 1.4% of the influent Hg(II) by biogenic sulfide. MeHg was always found to be undetectable in the bioreactor, even though the sulfidogenic bacteria were exposed to high levels of Hg(II) in long-term trials. The result of qPCR analysis further revealed that the mercury-methylation functional gene (hgcA) concentration in the bioreactor sludge was found to be extremely lower than in the SRB-enriched sludge, Geobacter sulfurreducens PCA and Desulfomicrobium baculatum DSM 4028, implying that there was no or few mercury methylators in the bioreactor. In short, the biological sulfur reduction process using (SRB)-R-0 can efficiently treat mercury-contaminated wastewater, with high Hg(II) removal efficiency and no MeHg accumulation. (C) 2019 Elsevier Ltd. All rights reserved.
机译：由于SRB产生的剧毒甲基汞（MeHg），由硫酸盐还原细菌（SRB）驱动的硫化过程不适用于汞污染的废水处理。在我们先前的研究中，我们在短期批量测试中观察到，还原硫细菌（（SRB）-R-0）可以除去汞离子而不会产生MeHg。因此，本研究的目的是开发一种由（SRB）-R-0驱动的用于汞污染废水的生物减硫工艺，并研究其在去除汞和MeHg积累方面的长期性能。还原硫生物反应器中接收的汞污染废水中汞含量为0-50 mg Hg（II）/ L达326天，（SRB）-R-0表现出对汞毒性的高耐受性，并去除了99.4％+/- 1.4％的汞。生物硫化物流入的Hg（II）。始终发现在生物反应器中无法检测到MeHg，即使在长期试验中将硫化硫细菌暴露于高水平的Hg（II）中也是如此。 qPCR分析的结果进一步表明，发现生物反应器污泥中的汞甲基化功能基因（hgcA）浓度远低于富含SRB的污泥，Geobacter sulphreducens PCA和Desulfomicrobium baculatum DSM 4028，这表明没有或生物反应器中很少有汞甲基化剂。简而言之，使用（SRB）-R-0的生物还原硫工艺可以有效处理汞污染的废水，具有很高的Hg（II）去除效率，并且没有MeHg积累。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《Water Research》 |2019年第1期|288-295|共8页
  • 作者

    Wang Jinting; Hong Yaowu; Lin Zichao; Zhu Chulian; Da Ji; Chen Guanghao; Jiang Feng;

  • 作者单位

    Hong Kong Univ Sci & Technol, Chinese Natl Engn Res Ctr Control & Treatment Hea, Dept Civil & Environm Engn, Water Technol Ctr,Hong Kong Branch,Kowloon, Clear Water Bay, Hong Kong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, MOE Lab Theoret Chem Environm, Guangzhou, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, MOE Lab Theoret Chem Environm, Guangzhou, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, MOE Lab Theoret Chem Environm, Guangzhou, Guangdong, Peoples R China;

    Hong Kong Univ Sci & Technol, Chinese Natl Engn Res Ctr Control & Treatment Hea, Dept Civil & Environm Engn, Water Technol Ctr,Hong Kong Branch,Kowloon, Clear Water Bay, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Chinese Natl Engn Res Ctr Control & Treatment Hea, Dept Civil & Environm Engn, Water Technol Ctr,Hong Kong Branch,Kowloon, Clear Water Bay, Hong Kong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, MOE Lab Theoret Chem Environm, Guangzhou, Guangdong, Peoples R China|Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou, Guangdong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sulfidogenic bacteria; Sulfur-reducing bacteria; Mercury removal; Methylmercury; Geobacter;

    机译：硫化细菌;还原硫细菌;除汞;甲基汞;土壤杆菌;

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