2013 Cilt 7 Sayı 21

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    Biostimulating effects of wastewater sludges on stressed soils
    (Uludağ Üniversitesi, 2013-12-09) Şağban, F. Olcay Topaç; Dindar, Efsun; Başkaya, Hüseyin S.; Uludağ Üniversitesi/Mühendislik Fakültesi/Çevre Mühendisliği Bölümü.
    Soil pollution is accepted as a pressing problem in many parts of the world resulting in efforts to develop a variety of soil remediation technologies. Properly processed wastewater sludge which contains significant amounts of nitrogen, phosphorus, organic matter and other trace elements is accepted as a promising nutrient source for microbes in soils contaminated with various contaminants. The objective of the present study was to determine the potential use of municipal wastewater sludge as a biostimulating agent in soils which has been irrigated with a polluted river water for long time and evaluate the soil enzyme activities. The results of 45 days incubation period indicated a significant improvement (1.5 to 5 fold in comparison to unamended polluted soil) in urease, alkaline phosphatase, dehydrogenase and β-glucosidase activities in sludge amended soils. Maximum values were observed in soils amended with 200 t/ha sludge. Although, the sludge dose of 100 t/ha increased the enzyme activity levels of polluted soil significantly, it seemed to be inadequate to increase activity levels of polluted soil to reference soil levels. Consequently, municipal sludge amendment with dose of 200 t/ha appeared to enhance the nutrient status of soil system, providing the removal of the anthropogenic stress caused by the irrigation from a polluted river.