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- Title
Feasibility study on produced water oxidation as a pretreatment at offshore platform.
- Authors
Ferreira, Ana Rita; Breinholt, Lars; Kaarsholm, Kamilla M. S.; Sanchez, Diego Francisco; Chhetri, Ravi K.; Muff, Jens; Andersen, Henrik R.
- Abstract
Produced water (PW) generated worldwide has lately become an issue of environmental concern. PW has a complex composition and a suitable treatment at offshore oil and gas platforms is required to achieve zero harmful discharge into the sea. The feasibility of electrochemical oxidation, heat-activated persulfate and ozonation was investigated as PW pretreatment. For comparison purposes, a common oxidant dosage level of 5% and 10% treatment equivalent chemical oxygen demand(COD) removal were established. Aiming to access PW biodegradability, an assay for biological oxygen demand(BOD) for high salinity matrix was also developed as a tool to characterize treatment efficiency. Electrochemical oxidation was largely independent on the anode materials, and controlled by the applied charge passed through the system. Heat-activated persulfate reaction was time-consuming and dependent on activation temperature, as well as initial oxidant concentration. Both methods reduced COD and BOD without significantly improving PW biodegradability, probably due to by-products generation. Ozonation had the most promising results applying doses ranging from 3.5 to 151 mgOWL. The benzene in PW after ozonation reduced up to 71% alongside with> 70% toxicity reduction for tested doses. Ozonation also showed to marginally improve PW biodegradability, which underline the potential of ozone to facilitate a subsequent biological treatment.
- Subjects
OIL field brines; OXIDATION of water; BIOCHEMICAL oxygen demand; OFFSHORE gas well drilling; DRILLING platforms
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2022, Vol 160, p255
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2022.02.008