Effect of oilfield wastewater on microbiota of a fresh water in Nigeria
Journal Title: Journal of Pharmacy Research - Year 2008, Vol 1, Issue 2
Abstract
Effect of oilfield wastewater to the Microbiota of the fresh river water was investigated. This was conducted by the determination of some physicochemical parameters which included pH, turbidity, total dissolved solids (TDS), total suspended solids (TSS), chloride, exchangeable cations and heavy metals as to ascertain the concentration of these constituents in the water samples; and the determination of total viable aerobic heterotrophic bacterial count, total coliform count and coliform types. The mean pH values ranged from 7.36 to 9.06, total dissolved solids (TDS) ranged from 24.00mgL-1 to 7,600.00mgL-1 while chloride values ranged from 30.13mgL-1 to 3,722.25mgL-1. The results obtained showed that with the exception of turbidity, total suspended solids, and sulphate which values were highest in the raw river water, values of all other parameters determined were highest in the oilfield wastewater. The order of decreasing concentration was oilfield waste water > mixture > raw river water. Total aerobic heterotrophic bacterial count ranged from 0.5 x 106 cfuml-1 to 8.2 x 106 cfuml-1 while the coliform population ranged from 0.07 x 106 cfuml-1 to 0.84 x 106 cfuml-1. Generally, there was a reduction in bacterial populations of the river water after the addition of the oilfield wastewater (5% V/V). The species of coliforms isolated belonged to four genera of Enterobacteriaceae which were Citrobacter, Enterococcus, Escherichia and Klebsiella. Escherichia coli was the most predominant in each of the water samples with a percentage occurrence of 50% and 36.36% in the raw river water and polluted water respectively; while Citrobacter sp was the least predominant in the raw river water (7.14%). The present investigation has therefore revealed the necessity of oilfield wastewater treatment prior to discharge into the recipient water body.
Authors and Affiliations
Obire, O1, Adigwe, P. C2, Ramesh. R. Putheti*3 and Okigbo, R. N4
Keywords
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