Effect of wastewater on biodegradability of drilling fluid
International Journal of Development Research
Effect of wastewater on biodegradability of drilling fluid
Received 10th September, 2017; Received in revised form 19th October, 2017; Accepted 14th November, 2017; Published online 30th December, 2017
Copyright © 2017, Renner R. Nrior et al. This 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.
This study reports the effect of waste water on biodegradation of drilling fluid contamination in brackish water environment. The experimental set ups include; Control 1(Brackish water with Water base drilling fluid) (BW+WB), Control 2 (Brackish water with Oil base drilling fluid) (BW+OB), Brackish water with Water base drilling fluid with Waste water (BW+WB+WW) and Brackish water with Oil base drilling fluid with Waste water (BW+OB+WW). Biodegradability was monitored for 28days. The average microbial load of the biodegradation monitoring for days 1, 7, 14, 21, and 28 were; Total Heterotrophic Bacterial (log10cfu/ml): Control 1 (BW+WB) 8.89±0.48, Control 2(BW+OB) 7.89±2.27, BW+WB+WW 8.85±0.82, BW+OB+WW 6.54±1.59; Hydrocarbon Utilizing Bacterial (log10cfu/ml): Control 1 (4.24±0.67), Control 2 (BW+OB) 4.33±0.56, BW+WB+WW 4.65±0.66, BW+OB+WW 4.92±0.77; Hydrocarbon Utilizing Fungi (log10cfu/ml): Control 1 (BW+WB) 4.23±0.61, Control 2 (BW+OB) 7.13±2.95, BW+WB+WW 8.01±2.61, BW+OB+WW 5.95±1.82. Major genera of drilling fluid utilizing bacteria and fungi isolated were; Bacillus, Pseudomonas, Micrococcus, Proteus; Mucor, Aspergillus, Rhizopus and Penicillium. The percentage (%) residual hydrocarbons at day 28 were; BW+WB+WW 0.65 < BW+WB 1.59 < BW+OB+WW 6.86
