MICROBIAL QUALITY AND CHANGES IN POLYAROMATIC HYDROCARBON CONTENT OF A BIOREMEDIATED OIL-POLLUTED SOIL AFTER EXPOSURE TO DIFFERENT PERIODS OF TILLAGE

Tillage practices on soils are effective for enhancing the soil’s structure and other physicochemical components. The present study was undertaken to investigate whether tilling of oil-contaminated can improve remediation efficiency soil. In study, activities principally carried out by just turning mixing in experimental bowls. Top soil obtained as pooled thoroughly mixed with spent engine oil (SEO) a uniform mix at 5% w/w. were eventually subjected diiferent periods mixing, including daily (1PD), twice weekly (2PW), once (1PW), monthly (2PM), (1PM) every 2 months (1P2M). control not turning, or (NTL). Remediation tiiled significantly higher than control, irrespective periodicity tillage. Reduction PAH components ranged from 252.26 mg/kg NTL 90.74 2PM. Improved reductions contents when turned (88.97 mg/kg) (80.05 mg/kg). A number microorganism species Achromobacter sp, Clostridium Micrococcus luteus M. varians, roseus, Bacillus pumilis well Aspergillus niger, A. fumigatus, Penicillium notatum Trichoderma sp. identified remediated soils; these may also have been involved process indicated their prevalence.