BENEFICIAL USE OF SEWAGE SLUDGE INCINERATION ASH IN THE NATIONAL ECONOMY

Abstract

Introduction. The paper provides an assessment of the possibility of using the ash of sewage sludge incineration as a useful component. When choosing a method for its beneficial use, it is important to consider the danger of its contamination with heavy metals. Methods. The content of heavy metals in the ash was analyzed using X-ray fluorescence and atomic absorption spectroscopy methods. The waste hazard class was determined and confirmed based on the water extract bioassay method. Doses of allowable waste application to the soil were calculated with account for the content of heavy metals in the ash. Results. According to the results of laboratory tests, ash (as a component of soil mixture) has a positive effect on the germination dynamics and plant growth (with Trifolium praténse as an example). These data suggest the possibility of using waste in technical reclamation. The estimated result of the development is an organic-mineral soil mixture based on the ash of sewage sludge incineration, which also can be used for strengthening and improvement of road slopes. Conclusion. The proposed developments will make it possible to solve issues of incineration ash disposal. The complex of the research methods applied in the course of this study can be successfully used to assess the degree of contamination with heavy metals in other solid wastes and soils.