Effect of Sulfur Granular, Iron Sulfate, and Thiobacillus Bacteria on Biodegradation of Diesel Oil

Background: Remediation of petroleum hydrocarbons from the soil is one of the essential factors. This study was conducted to test the impact of sulfur granular Municipal Soil Waste (sulfur granular MSW), foliar application of iron sulfate on biodegradation of diesel oil in a cadmium (Cd)-polluted soil in the presence of thiobacillus bacteria.Methods: Treatments consisted of applying sulfur granular MSW at the rates of ۰ and ۱۵ t/ha and foliar application of iron sulfate (۰ and ۵۰۰ mg/L) in a Cd-polluted (۰, ۱۰, and ۲۰ mg Cd/kg) soil that simultaneously contaminated with diesel oil (۰%, ۴%, and ۸% w/w) in the presence of thiobacillus bacteria. After ۶۰ days, the corns were harvested, and the plants’ Fe and Cd concentration was measured using Atomic Absorption Spectroscopy (AAS). In addition, thebiodegradation of diesel oil in the soil was measured.Results: Soil application of sulfur granular MSW (۱۵ t/ha) significantly increased the biodegradation of diesel oil in the soil by ۱۶.۱%. However, soil contamination with Cd had an adverse effect on the biodegradation of diesel oil in the soil. The presence of thiobacillus bacteria had a considerable effect on reducing the Fe and Cd concentration of the plant by ۱۶.۱% and ۱۷.۳%, respectively.Conclusion: Based on the study results, using sulfur granular MSW and foliar application of iron sulfate has a significant effect on the biodegradation of diesel oil in the heavy metal polluted soil. However, the role of plant physiology, the type, and the amount of pollution on phytoremediation efficiency cannot be ignored.

کلیدواژه ها:

Environmental pollution ، Iron ، Bio-degradation ، Hydrocarbons ، Thiobacillus