Feasibility study on produced water oxidation as a pretreatment at offshore platform

Ana Rita Ferreira*, Lars Breinholt, Kamilla M. S. Kaarsholm, Diego Francisco Sanchez, Ravi K. Chhetri, Jens Muff, Henrik R. Andersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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 151mgO3/L. 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.
Original languageEnglish
JournalProcess Safety and Environmental Protection
Volume160
Pages (from-to)255-264
Number of pages10
ISSN0957-5820
DOIs
Publication statusPublished - 2022

Keywords

  • Offshore produced water
  • Chemical oxidation process
  • Electrochemical oxidation
  • Ozonation
  • Heat-activated persulfate

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