不同外加电压的土壤微生物电解池对多环芳烃的去除效果及机理研究

Polycyclic aromatic hydrocarbons（PAHs）pose substantial threats to both human health and ecosystems，thereby rendering the remediation of PAHs-contaminated soils a considerable attention. Bioremediation methods have gained wide application due to their environmentally friendly characteristics，but the remediation efficiency is significantly hindered by the low abundance and activity of PAHs-degrading bacteria（PDB）. In this study，soil microbial electrolysis cells（SMEC）were constructed with the aim of enhancing the activity of PDBs and thus improving PAHs removal efficiency. The results showed that the 900-SMEC increased the removal efficiency of phenanthrene（PHE）and pyrene（PYR）to 42.6% ± 1.6% and 30.9% ± 0.6%，respectively. Meanwhile，the 900-SMEC generated the highest current of 1.4 mA，which was 1.8 times to that of the 500-SMEC. An increase in applied voltage was found to boost microbial activity and reduce charge and diffusion resistances within the system，thereby facilitating both power generation and PAHs removal efficiency. Microbial community analysis revealed that SMEC significantly increased the abundance of typical PDB. The copies of genes related to PAHs degradation were concurrently increased. In conclusion，SMEC represents a novel method to enhance the insitu bioremediation efficiency of PAHs-contaminated soils.