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首页> 外文期刊>Environmental Science & Technology >Electrochemical Pretreatment for Sludge Sulfide Control without Chemical Dosing: A Mechanistic Study
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Electrochemical Pretreatment for Sludge Sulfide Control without Chemical Dosing: A Mechanistic Study

机译：无需化学加药即可控制污泥硫化物的电化学预处理：机理研究

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摘要

Sulfide is a toxic and corrosive odorant generated in various sludge treatment and disposal systems. We developed an electrochemical pretreatment (EPT) approach to eliminate sludge sulfide production without adding chemicals. Biochemical sulfide potential (BSP) test was used to evaluate the effectiveness of EPT on sludge sulfide production. The sulfide control was effective with EPT, and we determined the underlying mechanism of EPT. EPT which was operated at 12 V for 720 s eliminated 99% of dissolved sulfide and 100% of gaseous H2S(g). In comparison, the dissolved sulfide reached 104 +/- 1 mg S/L in the control BSP test. A sulfur mass balance analysis in the BSP test showed that 90% of the produced sulfide was removed via metal precipitation. Metal distribution results confirmed that metals (i.e., Fe, Mn, and Ni) in the sludge became soluble after EPT and were released from their residual and organically bound fractions. EPT which was operated at 15 V solubilized around 73, 92, and 72% of Fe, Mn, and Ni, and these metals precipitated the sulfide that was produced from biological sulfate reduction. Sludge analysis revealed that EPT disintegrated sludge flocs and disrupted metal-binding functional groups. Specifically, reduction of 17% C=O functional groups in the sludge was found, which could be associated with metal release. The impact of oxidants (e.g., chlorine) generated from EPT on sulfide oxidation was minimal. The findings of this study broadened up our understanding of the electrochemical process for sulfide control during saline sludge digestion.
机译：硫化物是在各种污泥处理和处置系统中产生的有毒腐蚀性腐蚀剂。我们开发了一种电化学预处理（EPT）方法，无需添加化学物质即可消除污泥硫化物的产生。生化硫化物潜力（BSP）测试用于评估EPT对污泥硫化物生产的有效性。 EPT对硫化物的控制是有效的，我们确定了EPT的潜在机理。在12 V下运行720 s的EPT消除了99％的溶解硫化物和100％的气态H2S（g）。相比之下，在对照BSP测试中，溶解的硫化物达到104 +/- 1 mg S / L。 BSP测试中的硫质量平衡分析表明，通过金属沉淀去除了90％的生成硫化物。金属分布结果证实，污泥中的金属（即Fe，Mn和Ni）在EPT后可溶，并从其残留的和有机结合的馏分中释放出来。在15 V下运行的EPT溶解了73％，92％和72％的Fe，Mn和Ni，这些金属沉淀了由生物硫酸盐还原产生的硫化物。污泥分析表明，EPT分解了污泥絮凝物并破坏了与金属结合的官能团。具体而言，发现污泥中的C = O官能团减少了17％，这可能与金属释放有关。 EPT产生的氧化剂（例如氯）对硫化物氧化的影响很小。这项研究的发现拓宽了我们对盐污泥消化过程中控制硫化物的电化学过程的理解。

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  • 来源
    《Environmental Science & Technology》 |2019年第24期|14559-14567|共9页
  • 作者

    Zeng Qian; Hao Tianwei; Sun Bo; Luo Jinming; Chen Guanghao; Crittenden John C.;

  • 作者单位

    Hong Kong Univ Sci & Technol Dept Civil & Environm Engn Clear Water Bay Hong Kong Peoples R China;

    Hong Kong Univ Sci & Technol Dept Civil & Environm Engn Clear Water Bay Hong Kong Peoples R China|Univ Macau Fac Sci & Technol Dept Civil & Environm Engn Macau 999078 Peoples R China;

    Georgia Inst Technol Brook Byers Inst Sustainable Syst 828 West Peachtree St Atlanta GA 30332 USA|Georgia Inst Technol Sch Civil & Environm Engn 828 West Peachtree St Atlanta GA 30332 USA;

    Hong Kong Univ Sci & Technol Dept Civil & Environm Engn Clear Water Bay Hong Kong Peoples R China|Hong Kong Univ Sci & Technol Chinese Natl Engn Res Ctr Control & Treatment Hea Hong Kong Branch Clear Water Bay Hong Kong Peoples R China|Hong Kong Univ Sci & Technol Water Technol Ctr Clear Water Bay Hong Kong Peoples R China|Hong Kong Univ Sci & Technol FYT Grad Sch Wastewater Treatment Lab Guangzhou 511458 Guangdong 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《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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