Treatment of waters polluted with crude oil by a natural wetland
1999
Groudeva, V.I. | Doycheva, A.S. (University of Sofia (Bulgaria). Dept. of Microbiology) | Groudev, S.N.
In the Tulenovo oil deposit, Northeastern Bulgaria, waters contaminated with crude oil and some toxic heavy metals were treated by a passive system consisting of a natural wetland. The wetland was characterized by an abundant water and emergent vegetation and a varied microflora.. The oil was removed by a consortium of different oil-degrading microorganisms, and the heavy metals were removed as a result of processes such as the microbial dissimilatory sulphate reduction, biosorption and microbial oxidation of Mn2+. The oil content in the wetland effluents was less than 0.3 g per liter, and the heavy metals were present in concentrations lower than the relevant permissible levels for waters intended for use in the agriculture and/or industry.
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