The research of COD removal and microbiological community characteristics of Xinjiang oilfield fracturing flowback fluid with different hydraulic retention times
In allusion to the current situation of Xinjiang oilfield fracturing flowback fluid,which is difficult to treat,the biofilm method was adopted as the main unit of the treatment process to inves-tigate the influence of different hydraulic retention times(HRT)on chemical oxygen demand(COD)removal.The microbiological community characteristics were determined by high-throughput sequen-cing and functional prediction under different hydraulic retention times.The results showed that the suitable HRT was 48 h when biofilm method was used to treat the fracturing return fluid in the Xin-jiang oilfield.The COD removal efficiency was the highest,the average removal rate of the influent COD was 46.77％and the average removal velocity was 83.33 mg·(L·d)-1.Compared with the HRT of 36 h and 72 h,the microbial diversity of the HRT of 48 h was higher and the community composition was richer.The microbiological community was formed with Proteobacteria,Firmicutes,Campylobacterota,Bacteroidota,and Desulfobacterota as the main dominant bacteria under the HRT of 48 h.The microflora had functional genes for the metabolism of difficult-to-biode-grade substances and promote the biodegradation of fracturing flowback fluid in Xinjiang oilfield.
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万方数据
