Removal of zinc pollution by using some hyperaccumulator plants in sewage sludge treated and untreated soils

Abstract

In this study, the possibilities of removing the pollution caused by Zn, which is given to the loamy soil together with sewage sludge and without sewage sludge at increasing levels (0, 75, 150, 300, 600 and 1200 mg kg-1), has been researched with certain hyperaccumulator plants such as Brassica juncea, Raphanus sativus and Silene vulgaris grown in Bafra ecological conditions. During the trial established according to the randomized block experimental design, plant removed the most Zn among the hyperaccumulator plants topic of the study was determined, and also labile Zn soil fractions (water soluble, organic bound, changeable) were defined. In order to clean Zn added to the soil at increasing levels with or without sewage sludge by using phytoremediation technology, S. vulgaris was found to remove the highest amount of Zn in the soil by producing the greatest amount of biomass in the ecological conditions of the region compared to B. Juncea and R. Sativus other hyperaccumulator plants grown in the plots. Significant differences were determined in the development of plants and Zn removal between the sludge treated and untreated plots. Based on the results obtained, it can be said that S. vulgaris may be the most suitable hyperaccumulator plant in the ecological conditions of the region, in addition when there is 300 mg kg-1 Zn in the soil, in order to clean the land by using phytoremediation technology with S.vulgaris, approximately 3 vegetation periods are required and in case of sewage sludge application and 12 vegetation periods are required without sewage sludge application.