Biodegradation in seawater of PAH and alkylphenols from produced water of a North Sea platform

Chemosphere
Synnøve LofthusOdd Gunnar Brakstad

Abstract

Operational planned discharges of produced water (PW) to the marine environment from offshore oil production installations, contain low concentrations of dispersed oil compounds, like polycyclic aromatic hydrocarbons (PAHs) and alkylated phenols (APs). Biotransformation in natural seawater (SW) of naphthalenes/PAHs and phenol/APs in field-collected PW from a North Sea platform was investigated in this biodegradation study. The PW was diluted in SW from a Norwegian fjord, and the biodegradation study was performed in slowly rotating carousels at 13 °C over a period of 62 days. Naphthalenes/PAHs and phenol/APs biotransformation was determined by first-order rate kinetics, after normalization against the recalcitrant biomarker 17α(H),21β(H)-Hopane. The results from this study showed total biotransformation half-lives ranging from 10 to 19 days for groups of naphthalenes and PAHs, while half-lives for APs (C0- to C9-alkylated) were 10-14 days. Biotransformation half-lives of single compounds ranged from 8 to >100 days for naphthalenes and PAHs (median 16 days), and from 5 to 70 days (median 15 days) for phenols and APs. Four of the tested PAHs (chrysene, benzo(b)fluoranthene, benzo(e)pyrene, benzo(g,h,i)perylene) and one AP (4-tert...Continue Reading

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Citations

Sep 19, 2020·Rapid Communications in Mass Spectrometry : RCM·Martin OppegårdLisbet Sørensen
Nov 9, 2020·Marine Environmental Research·Raymond NepstadJørgen Skancke
May 1, 2021·Journal of Industrial Microbiology & Biotechnology·Thomas MainkaStefan Pflügl
Jul 23, 2021·Environmental Monitoring and Assessment·Frits Steenhuisen, Martine van den Heuvel-Greve

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