Results of Experimental Studies on the Method for Determining the Ash Content of Sewage Sludge after Its Treatment in a Bioreactor

This article is devoted to the study of mesophilic and thermophilic regimes of anaerobic digestion of sewage sludge in a bioreactor. The research aim is the development of a technology for obtaining clean soil from sewage sludge treated in a bioreactor. The article presents methods for processing experimental results using ash content determination techniques. The stages of experimental studies on anaerobic digestion of sewage sludge are outlined. The methodology for determining the ash content of the studied clean soil samples is provided. Analyses conducted in the “Biotechnology” laboratory are aimed at determining the chemical and toxicological characteristics of sewage sludge. As a result of the experimental studies, comparisons of mesophilic and thermophilic digestion regimes are presented. For a comparative analysis of the digestion regimes, the article employs methods for determining the mass fraction of organic matter and ash content indicators in samples of sewage sludge treated in a bioreactor. Technological regimes of anaerobic digestion of sewage sludge in a bioreactor are analyzed for optimization purposes. Based on the results of the experimental studies, the application of sewage sludge treated in a bioreactor is recommended as clean soil for the reclamation of disturbed lands during the greening of populated areas.