The General Principles of Waste Processing with Recovery of their Energy Potential on the Basis of Plasma Technologies. Part III. Comparative analysis of the oxygen and air blowing influence and the role of calorific content of sewage sludge - V. A. Zhovtianskyi; E. P. Kolesnikova; M. V. Yakymovych; P. A. Seredenko (Energy Technologies and Resource Saving, 2018)