Oilfield wastewater treatment by combined microfiltration and biological processes

This work deals with the treatment of offshore oilfield wastewater from the Campos Basin (Rio de Janeiro State, Brazil). After coarse filtration, this high saline wastewater was microfiltrated through mixed cellulose ester (MCE) membranes, resulting in average removals of COD, TOC, O&G and pheno...

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Bibliographic Details
Published in:Water research (Oxford) 2002, Vol.36 (1), p.95-104
Main Authors: Campos, J.C., Borges, R.M.H., Oliveira Filho, A.M., Nobrega, R., Sant’Anna, G.L.
Format: Article
Language:English
Subjects:
Air-lift bioreactor
Animals
Applied sciences
Artemia
Artemia salina
Biodegradation, Environmental
Brazil
Chromatography, Gas
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
Filtration
Fuels
Industrial wastewaters
Microfiltration
Oilfield wastewater
Oxygen - analysis
Particle Size
Petroleum
Pollution
Pollution caused by production, transportation and treatment of oil and oil shales. Water and soil pollution. Treatments. Pollution control
Sodium Chloride
Toxicity
Toxicity Tests
Waste Disposal, Fluid - methods
Wastewaters
Water - chemistry
Water Purification - methods
Water treatment and pollution
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Summary:This work deals with the treatment of offshore oilfield wastewater from the Campos Basin (Rio de Janeiro State, Brazil). After coarse filtration, this high saline wastewater was microfiltrated through mixed cellulose ester (MCE) membranes, resulting in average removals of COD, TOC, O&G and phenols of 35%, 25%, 92% and 35%, respectively. The permeate effluent was fed into a 1-L air-lift reactor containing polystyrene particles of 2 mm diameter, used as support material. This reactor was operated for 210 days, at three hydraulic retention times (HRT): 48, 24 and 12 h. Even when operated at the lowest HRT (12 h), removal efficiencies of 65% COD, 80% TOC, 65% phenols and 40% ammonium were attained. The final effluent presented COD and TOC values of 230 and 55 mg/L, respectively. Results obtained by gas chromatography analyses and toxicity tests with Artemia salina showed that a significant improvement in the effluent's quality was achieved after treatment by the combined (microfiltration/biological) process.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(01)00203-2