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Enhancing the treatment of petrochemical wastewater using redox mediator suspended biofilm carriers

机译:使用氧化还原介质悬浮生物膜载体增强石化废水的处理

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摘要

The treatment efficiency of petrochemical wastewater via the traditional activated sludge process is generally unsatisfactory due to the complex and toxic features of petroleum compounds. Redox mediator (RM) can improve the biodegradation of organic contaminants by participating in the microbial extracellular electron transfer process. However, the continuous dosing of the soluble redox mediator would lead to secondary pollution and rise operation cost. In this study, an insoluble and economical redox mediator material (biochar) was introduced into high-density polyethylene (HDPE) to prepare suspended biofilm carriers (RM-modified carriers), and applied in anaerobic/oxic (A/O) reactors. The reactor filled with RM-modified carriers (R3) showed the removal efficiency of chemical oxygen demand (COD) and phenol in the anaerobic zone were 34.6 % and 43.0 % respectively at organic loading rates (OLRs) of 22.2 kg COD/(m(3).d), which increased by 6.8 % and 8.3 % respectively compared with that of the reactor filled with conventional HDPE carriers (R2), and increased by 12.4 % and 17.7 % respectively compared with that of the reactor without filled with carriers (R1). Microbial analysis proved that the relative abundance of Bacteroides that participated in electron transfer of R3 improved by approximately 6.3 % compared with that of R2. These findings demonstrated that RM-modified carriers improved the abundance of relevant functional bacteria and enhanced the degradation efficiency of the contaminants in petrochemical wastewater.
机译:由于石油化合物的复杂和有毒特征,通过传统活性污泥工艺的石化废水的处理效率通常不令人满意。氧化还原介体(RM)可以通过参与微生物细胞外电子转移方法来改善有机污染物的生物降解。然而,可溶性氧化还原介质的连续给药将导致二次污染和上升运营成本。在该研究中,将不溶性和经济的氧化还原介体材料(BioChOR)引入高密度聚乙烯(HDPE)中以制备悬浮的生物膜载体(RM-修饰的载体),并在厌氧/氧(A / O)反应器中施用。填充有RM改性载体(R3)的反应器显示出分别在22.2kg COD /(M( 3).D),与填充常规HDPE载体(R2)的反应器相比,分别增加了6.8%和8.3%,并分别与反应器相比增加了12.4%和17.7%而不填充载体( R1)。微生物分析证明,与R2相比,参与R3的电子转移的拟种菌体的相对丰度提高了约6.3%。这些研究结果证明,RM改性载体改善了相关功能细菌的丰富,并提高了石化废水中污染物的降解效率。

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  • 来源
    《Biochemical Engineering Journal》 |2021年第1期|共11页
  • 作者单位

    Dalian Univ Technol Sch Environm Sci &

    Technol Key Lab Ind Ecol &

    Environm Engn Minist Educ Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Environm Sci &

    Technol Key Lab Ind Ecol &

    Environm Engn Minist Educ Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Environm Sci &

    Technol Key Lab Ind Ecol &

    Environm Engn Minist Educ Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Environm Sci &

    Technol Key Lab Ind Ecol &

    Environm Engn Minist Educ Dalian 116024 Peoples R China;

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

    Biofilm carrier; A/O process; Redox mediator (RM); Biochar;

    机译:生物膜载体;A / O过程;氧化还原介质(RM);生物炭;

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