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首页> 外文期刊>Journal of Hazardous Materials >Enhanced dewatering of activated sludge by acid assisted Heat-CaO_2 treatment: Simultaneously removing heavy metals and mitigating antibiotic resistance genes
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Enhanced dewatering of activated sludge by acid assisted Heat-CaO_2 treatment: Simultaneously removing heavy metals and mitigating antibiotic resistance genes

机译：通过酸辅助加热-Ca_2处理增强活性污泥的脱水：同时除去重金属和减轻抗生素抗性基因

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摘要

High water content and accumulation of heavy metals and antibiotic resistance genes (ARGs) in sewage sludge limit its application. Fenton process has been widely used in sludge dewatering, but the use of hydrogen peroxide (H2O2) and generation of acid sludge are the main drawbacks. Here, a novel method of heat-CaO2 treatment was proposed to enhance sludge dewatering. Results showed that CaO2 (12.5 mg/g dry solids (DS)) combined with heat at 60 degrees C significantly improved the sludge dewaterability, e.g. the water content decreased from 79.9% to 69.2% and the specific resistance to filtration (SRF) decreased from 9.21 x 1013 to 1.51 x 1013 m/kg. At 62.5 mg CaO2/g DS, the final pH of filtrate was close to neutral and the good dewatering performance was still achieved. The improvement of sludge dewaterability was closely correlated with the decomposition of tightly-bound extracellular polymeric substances (EPS), lysis of the sludge cells, and increased particle size of the flocs. The distribution of bacterial community in the sludge has changed, leading to the decreases in the percentage of some ARGs. The concentrations of typical heavy metals wrapped in the sludge colloid network dramatically reduced. Economic analyses showed that the heat-CaO2 treatment was a promising method for sludge disposal.
机译：污水污泥中重金属和抗生素抗性基因（Args）的高含水量和积累限制其应用。芬顿工艺已广泛用于污泥脱水，但使用过氧化氢（H2O2）和酸污泥的产生是主要缺点。这里，提出了一种新的热-CA2处理方法，以增强污泥脱水。结果表明，在60摄氏度下与热合并加热CaO2（12.5mg / g干燥固体（DS））显着改善了污泥脱水性，例如改善污泥脱水性。水含量从79.9％降低至69.2％，并且对过滤的特异性抗性（SRF）从9.21×1013降低至1.51×1013 m / kg。在62.5mg caO2 / g ds，滤液的最终pH靠近中性，仍然达到良好的脱水性能。污泥脱水性的改善与紧密结合的细胞外聚合物物质（EPS），污泥细胞的裂解和絮凝剂的裂解的分解密切相关。污泥中细菌群落的分布发生了变化，导致一些args的百分比下降。在污泥胶体网络中包裹的典型重金属的浓度显着降低。经济学分析表明，热CAO2治疗是污泥处理的有希望的方法。

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  • 来源
    《Journal of Hazardous Materials》 |2021年第15期|126248.1-126248.10|共10页
  • 作者

    He Dongqin; Bao Bo; Sun Mingkai; Chen Jingyi; Luo Hongwei; Li Jun;

  • 作者单位

    Zhejiang Univ Technol Coll Environm Key Lab Microbial Technol Ind Pollut Control Zhej Hangzhou 310014 Peoples R China;

    Zhejiang Univ Technol Coll Environm Key Lab Microbial Technol Ind Pollut Control Zhej Hangzhou 310014 Peoples R China;

    Zhejiang Univ Technol Coll Environm Key Lab Microbial Technol Ind Pollut Control Zhej Hangzhou 310014 Peoples R China;

    Zhejiang Univ Technol Coll Environm Key Lab Microbial Technol Ind Pollut Control Zhej Hangzhou 310014 Peoples R China;

    Zhejiang Univ Technol Coll Environm Key Lab Microbial Technol Ind Pollut Control Zhej Hangzhou 310014 Peoples R China;

    Zhejiang Univ Technol Coll Environm Key Lab Microbial Technol Ind Pollut Control Zhej Hangzhou 310014 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Activated sludge dewatering; Extracellular polymeric substances; Heavy metals; Antibiotic resistance genes; Heat-CaO2 treatment;

    机译：活性污泥脱水;细胞外聚合物物质;重金属;抗生素抗性基因;加热-CAO2治疗;

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