Effect of Complex Technological Means on Biodegradation of Oil Products and Succession of Microorganisms in Polluted Soil

The impact of various technological means (addition of NPK, sewage sludge, and biopreparation) on oil product degradation was studied ex situ in biodegradation sites. The degradation degree of oil products depended on pollutant concentration and addition of fertilizers. The succession of microorganisms during biodegradation process in polluted soil was ascertained. The addition of NPK stimulated the growth of ammonifying bacteria and fungi, while sewage sludge promoted the growth of ammonificators and yeasts but suppressed fungi. The increase of OO bacteria positively correlated with the abundance of heterotrophic bacteria, while the amounts of OO yeast and fungi correlated negatively. It was demonstrated that sewage sludge is a suitable organic fertilizer for polluted soil bioremediation and, moreover; in this way the problem of this industrial waste utilization could be solved as well.