Environmental aspects of the use of sewage sludge as fertilizer materials

Abstract

The possibilities of using sewage sludge as fertilizer materials are determined by their chemical composition, sanitary-toxicological and physical condition. In each case, the use of these wastes must be preceded by studies proving not only their nutritional value, but also safety, and be accompanied by the development of an environmentally friendly technology for their disposal. The paper provides data on the analysis of industrial soil based on sewage sludge with the aim of using it for the restoration of disturbed and contaminated lands. In an experiment with the cultivation of cereal grasses, the limiting doses of introducing waste were determined. An increase in the amount of sewage sludge led to an increase in the gross content of heavy metals in the industrial soil, and the cadmium content exceeded the permissible standards for close to neutral and neutral soils. A clear correlation between the content of toxicants in the soil and their accumulation in plants was not observed.