Toxicity of raw and bio slurry treated oily sludge on Nitrobacter species and Tilapia guineensis

Toxicity of raw and bio-slurry treated oily sludge (OS) on Nitrobacter species was determined using standard analytical procedures. The total petroleum content the OS 116.44 ± 3.57 g/kg. TPH rich with Saturate (40.46 0.73 %). This followed by Aromatics (27.94 0.50 %) Asphaltenes (26.58 0.90 %), while NSO fraction had least proportion (5.75 0.47 Contamination coastal soil increased residual concentration in from 5.0561 ppm to 24.2305 ppm. OS-ladened were subjected biodegradation 1.5-litter borosilicate glass bioreactors bioaugmented single population known utilizer (Pseudomonas aeruginosa) consortium biosurfactant producing bacterial (Bacillus subtilis). Findings revealed that he bioslurry augmented reduced 6.313 (73.95% reduction) 11.5751 (52.23%) recorded for population. also able remarkable reduce toxicity (LC50 = 20.94 ppt) species. LC50 104.64 ppt treatment 36.25 ppt. reduction indicates potentials synergistic action between producer toxicity. findings this study can be explored as a cost-effective method waste management Oil Gas industry.