BIOSTIMULATION POTENTIALS OF CHICKEN DROPPING ON SPENT OIL CONTAMINATED SOIL FROM AUTOMOBILE WORKSHORPS IN KEFFI, NASARAWA STATE NIGERIA

摘要

Research into the use of organic waste for the biostimulation and bioremediation of hydrocarbon contaminated soils has expanded rapidly over the years. In this study, the possibility of chicken dropping to stimulate the growth of hydrocarbon utilizingbacteria and optimize total hydrocarbon biodegradation of oil contaminated soil from mechanic workshop was investigated. Soil samples from five (5) different automobile workshops within Keffi, Nasarawa State Nigeria were mixed with poultry droppings atconcentrations of 0% (control), 10% and 30%. The set up was then left for a period of 4 weeks. The chicken droppings had total bacteria and fungi counts of 2.51.10~7 cfu g~(-1) and 1.98.10~6 cfu g~(-1) respectively, while soil samples had the bacterial count in the range of 3.92.10~6-4.87.10~6 cfu g~(-1). Chicken dropping had mean pH, nitrogen, phosphorus, carbon and moisture contents of 7.06±0.78, 0.88±0.07%, 36.90±3.11 mg kg~(-1), 3.08±0.11% and 44.78±1.90% respectively. The nitrogen and carbon content in all experimental soil decreases with increase in bioremediation time. All the bio-remediated soil had significantly (p < 0.05) higher hydrocarbon utilizing bacteria (HUB) than the control (un-remediated). In all the soil samples remediated, 30%remediation had significantly (p < 0.05) highest HUB in the range of 16.87. 10~6-19.87.10~6 when compared with those remediated with 10% chicken droppings (14.78.10~6-16.89.10~6). This study demonstrated that chicken droppings are good organic substratecontaining nitrogen, phosphorus, and carbon, with great potentials for biostimulation of hydrocarbon utilizing bacteria in oil contaminated soil.