Oil-produced wastewater treatment plants, especially those involving biological treatment processes, harbor rich and diverse microbes. However, knowledge of microbial ecology and microbial interactions determining the efficiency of plants for oil-produced wastewater is limited. Here, we performed 16S rDNA amplicon sequencing to elucidate the microbial composition and potential microbial functions in a full-scale well-worked offshore oil-produced wastewater treatment plant. Results showed that microbes that inhabited the plant were diverse and originated from oil and marine associated environments. The upstream physical and chemical treatments resulted in low microbial diversity. Organic pollutants were digested in the anaerobic baffled reactor (ABR) dominantly through fermentation combined with sulfur compounds respiration. Three aerobic parallel reactors (APRs) harbored different microbial groups that performed similar potential functions, such as hydrocarbon degradation, acidogenesis, photosynthetic assimilation, and nitrogen removal. Microbial characteristics were important to the performance of oil-produced wastewater treatment plants with biological processes.
Bibliographical noteFunding Information:
This study was supported by the National Natural Science Foundation of China in the form of grants awarded to FZ (51774257, 51504221) and YS (51574038, 51634008), the National Science and Technology Major Oil and Gas Special Project in the form of a grant awarded to YS (2017ZX05009-004), the Weizhou Terminal COD Treatment System Material Procurement Project in the form of a grant used to obtain the study samples (GC2018ZCYH0107), Sinopec Shengli Oilfield in the form of a salary for WL, and CNOOC Energy Development Co. Ltd. in the form of a salary for LW. The specific roles of these authors are articulated in the ?author contributions? section. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
© 2021 Deng et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
- Research Article
- RNA, Ribosomal, 16S/chemistry
- Oil and Gas Fields/microbiology
- Water Pollutants/isolation & purification
- Waste Disposal, Fluid/instrumentation
- Waste Water/microbiology