Contact: Department of Environmental Management and Toxicology, Faculty of Life Sciences
ABSTRACT: Contamination by petroleum has negative impact on the quality of the soil and water. This study was conducted to investigate the impact of organic wastes on the physico-chemical properties of diesel-contaminated soil. The soil treatments were in three levels of diesel pollution (50ml, 100ml and 150ml) and amended with poultry litter, cow dung and mixed compost amendments of poultry litter and cow dung. The changes in physico-chemical qualities of the treatment sets were monitored for a period of six months between July 2016 and December, 2016 using standard analytical methods. The results revealed temperature (oC): 24.00 ± 0.50 to 38.90 ± 0.25, pH: 4.71 ± 0.02 to 6.03 ± 0.02; with highest values for both parameters recorded in December, 2016; electrical conductivity (µ/cm), 64.40 ± 6.20 to 356.00 ± 51.0, moisture content(%): 0.52 ± 0.03 to 19.25 ± 2.05; with highest values recorded for C1, soil with poultry litter and cow dung amendment with 50 ml diesel and B3, soil with cow dung amendment with 150ml diesel, in July, 2016 respectively; organic carbon (%): 0.24 ± 0.02 to 4.01 ± 0.01 and total nitrogen (%): 0.02 ± 0.00 to 3.90 ± 0.01 with highest values recorded for B1 (cow dung amendment with 50 ml diesel) and A2 (poultry litter amendment with 100 ml diesel) in September and December, 2016 respectively. This result therefore agrees with the buffering qualities of organic wastes on diesel contaminated (acidic) soil.
Keywords: Key words: Diesel oil pollution, animal wastes, pH, Electrical conductivity, Total organic carbon.