The Effect of the Addition of Petroleum Coke and Excess Activated Sludge From Sewage Treatment Plants on the Thermogravimetric Characteristics of Hydrolyzed Lignin

The necessity of searching for an effective way to dispose of hydrolyzed lignin from excess activated sludge as large-scale industrial waste is shown. Based on the literature analysis, it is concluded that they can be used as a component of solid fuels. The chemical composition and structure of excess activated sludge, hydrolyzed lignin, and highsulfur petroleum coke are presented. A thermogravimetric analysis of the study objects and mixtures based on them has been performed. Differential scanning calorimetry curves of petroleum coke, activated sludge, hydrolyzed lignin, and mixtures based on them have been obtained. The dependence of the thermal characteristics of the obtained samples upon heating to 900°C in an air environment is determined, depending on the content of petroleum coke and activated sludge mixed with hydrolyzed lignin. Conclusions were drawn based on the conducted research on the possibility of using them as a fuel component.