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Research Article |

Microbial Detoxification of Oilfield Produced Water Using Discontinuous Bio-Unit System

This work investigated the biodetoxification of oilfield produced water (OPW) using indigenous microbial consortium in discontinuous aerobic biological treatment (Bio-Unit) system. The pilot scale Bio-Unit has a single tank that is operated cyclically. The Bio-Unit performance was compared with that of an extant physical treatment unit (PTU) of a crude oil facility. The pilot scale Bio-Unit achieved higher effluent indices at optimal conditions of microbial retention time of 21 days and hydraulic retention time of 24 hours. The percentage removal of Total Dissolved Solids (TDS), Total Suspended Solids (TSS), Total Organic Carbon (TOC), Salinity and Chemical Oxygen Demand (COD) using the Bio-Unit were 98.2%, 96.8%, 98.5%, 96.7%, 97.6%, respectively, while for the physical treatment (PTU) process were 31.5%, 55.3%, 82.2%, 37.1% and 73.8%, respectively. Comparison showed that the Bio-Unit performed better than the extant PTU. The after-treatment concentrations of TOC (83.1 mg/l), Salinity (2290.7 mg/l) and COD (152.6 mg/l) from the existing physical treatment unit (PTU) were above Nigerian DPR inland and nearshore permissible level, while the after-treatment concentrations of TOC (6.81mg/l), Salinity (120.03 mg/l), and COD (14.1 mg/l) from the pilot scale Bio-Unit were below the regulatory limits. Therefore, it is proposed that the extant PTU be upgraded by retrofitting it with the Bio-Unit so as to meet produced water quality requirement for reinjection into oil reservoir or disposal to the environment.

Oilfield Produced Water, Physical Treatment, Discontinuous Bio-Unit, Microbial Consortium, Biodecontamination

APA Style

Nwokoma, D. B., Dagde, K. K. (2023). Microbial Detoxification of Oilfield Produced Water Using Discontinuous Bio-Unit System. American Journal of Chemical Engineering, 11(5), 95-101.

ACS Style

Nwokoma, D. B.; Dagde, K. K. Microbial Detoxification of Oilfield Produced Water Using Discontinuous Bio-Unit System. Am. J. Chem. Eng. 2023, 11(5), 95-101. doi: 10.11648/j.ajche.20231105.12

AMA Style

Nwokoma DB, Dagde KK. Microbial Detoxification of Oilfield Produced Water Using Discontinuous Bio-Unit System. Am J Chem Eng. 2023;11(5):95-101. doi: 10.11648/j.ajche.20231105.12

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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