Study on the Efficacy of Co-metabolism in Degrading Polycyclic Aromatic Hydrocarbons in Tidal River Sediments
Due to the tidal influence of tidal rivers,the salinity of the overlying water fluctuates greatly and has significant regional differences.Therefore,it is of practical importance to investigate the effects of different salinity on the degradation of polycyclic aromatic hydrocarbons(PAHs)in the sediment of tidal rivers when applying microbial co-metabolism.In this study,sodium acetate coupled with phthalic acid was used as the co-metabolizing sediment to investigate the effects of 0‰～40‰salinity of the overlying water on the degradation of PAHs,the physicochemical properties(pH,ORP)and the sulfur metabolism(acid volatile sulfide(AVS),SO42-)of the sediment.The results of the study showed that there were large differences in the degradation of PAHs in the sediment when the salinity fluctuation of the overlying water increased from 10‰to 50‰.The low salinity environment was more favorable for the degradation of PAHs,and the high salinity overlying water was prone to lead to the enrichment of AVS and SO42-in the sediment during the process of microbial co-metabolism.In this study,we investigated the effect of salinity on the degradation efficiency of PAHs pollution in substrate by biological co-metabolism in tidal rivers,and provided a theoretical basis for the study of the removal of difficult organic matter in substrate under different salinity fluctuation conditions in tide-sensitive rivers.
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