生物电人工湿地系统处理抗生素废水的研究进展

Research progress on treatment of antibiotic wastewater by bioelectric constructed wetland system

  • 摘要: 生物电人工湿地系统(CW-MFC)是一种耦合人工湿地(CW)和生物电化学系统的新兴技术,其除保留CW在水处理方面的优势外,还可通过富集电化学功能菌群强化系统对复杂污染物的去除。近年来国内外关于CW-MFC处理抗生素废水的相关研究取得了一定进展,但在其效能和机理方面缺乏系统的归纳总结。基于此,首先系统归纳了CW-MFC对磺胺类、四环素类、喹诺酮类等抗生素的去除效果及其主要影响因素,再从微生物、电化学作用、填料和植物4个方面阐述了其在抗生素去除过程中的作用及机理。结果表明:CW-MFC对磺胺类、四环素类和喹诺酮类抗生素的去除效率可以达到80%,抗生素在CW-MFC中可通过填料吸附截留、植物根系吸收和微生物电化学作用等多种机制协同去除,其中环丙沙星的去除以填料吸附为主,相比之下磺胺和四环素类抗生素更易被微生物降解。CW-MFC在处理抗生素废水,特别是修复抗生素污染地表水体方面具有广阔的应用前景,但该系统在处理抗生素时仍面临着抗性基因传播风险。

     

    Abstract: Constructed wetland-microbial fuel cell (CW-MFC) is a new technology coupling constructed wetland (CW) and bioelectrochemical system. In addition to retaining the advantages of CW in water treatment, it can enhance the removal of complex pollutants by enriching the electrochemical functional flora of the system. In recent years, some progress has been made in treating antibiotic wastewater by CW-MFC at home and abroad, but there is no systematic summary of its effectiveness and mechanism. Firstly, the removal effect of sulfonamides, tetracyclines and quinolones by CW-MFC and its main influencing factors were summarized. Secondly, the functions and mechanisms in the process of antibiotic removal were analyzed from four aspects: microorganism, electrochemical action, stuffing and plant. The results showed that the removal efficiency of CW-MFC for sulfonamides, tetracyclines and quinolones antibiotics could reach up to 80%. Antibiotics could be synergistically removed in CW-MFC by various mechanisms such as adsorption and retention of stuffing, uptake by plant roots and microbial electrochemistry. Ciprofloxacin removal was dominated by filler adsorption, whereas sulfonamides and tetracyclines antibiotics could be more susceptible to microbial degradation. In summary, CW-MFC can be widely applied in treating antibiotic wastewater, especially in the remediation of antibiotic-contaminated surface waters. However, the system still faces the risk of resistance gene transmission when treating antibiotics.

     

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