Abstract
High-salinity wastewater discharged from offshore oil rigs (WORS) is harmful to marine environments. Therefore, WORS should be properly treated before discharge. In this study, a full-scale anaerobic baffle reactor (ABR) + sequencing batch reactor (SBR) + sand filter (SF) process was used for the first time to treat WORS at an inshore treatment terminal. After seeding with residual sludge from a municipal wastewater treatment facility, the start-up of the ABR and SBR was accomplished in one month. During a steady running period, the ABR + SBR process showed stable performance in treating WORS. The results of microbial diversity indicated that Rhizobiales, Thermotogales, and Actinomycetales were the most abundant genera in the ABR sample, while Acidobacteria DRC31, Lactobacillales, and Bacillales prevailed in the SBR sample. The results showed that ABR + SBR is a reliable process for WORS treatment, with the treated WORS meeting the National Sewage Comprehensive Emission Standards (GB8978-1996).
Highlights
Potential oil and gas resources exist in the South China Sea [1]
The anaerobic baffle reactor (ABR) effluent was recycled to the inlet port to dilute the high-salinity wastewater discharged from offshore oil rigs (WORS)
Due to the diluting effect of the filled freshwater, during the first 5 days, removal rates approaching 65% are achieved in the ABR
Summary
Potential oil and gas resources exist in the South China Sea [1]. Considering the economic benefits, numerous offshore oil rigs for drilling oil and gas are presently in operation. Offshore oil rigs are efficient structures supporting offshore drilling, which is an important means of partly satisfying the increasing oil consumption in China. Exploration and production generates considerable high-salinity wastewater discharged from offshore oil rigs (WORS) [2,3]. The South China Sea is an environmentally sensitive area, and the preservation of the ecosystem is necessary for the marine environment. Thousands of people live in this area. Environmental protection is extremely important, and the appropriate treatment of WORS must be adopted in these oil rigs
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