The influence of hygienisation of sewage sludge on the process of pyrolysis

Abstract

The aim of this work was to determine the influence of liming on the process of pyrolysis. Three samples of sludge from two wastewater treatment plants were selected for this study on pyrolysis: sludge without liming and limed sludge from the Central Wastewater Treatment Plant in Ostrava and sludge from the Wastewater Treatment Plant in Sviadnov. The samples had different content of calcite (CaCO 3 ). The limed sludge contained 7% of CaCO 3 , sludge without liming 3.8% and sludge without liming from WWTP Sviadnov contained 0.5% of calcite. The results of laboratory pyrolysis proved that limed sludge released the maximum amount of carbon -55.46 %, while sludge without liming from WWTP Sviadnov released only 48.92%. Calcite produces during its decomposition CaO and the product influences the pyrolysis process because it supports cracking of volatile organic compounds

Unburned carbon from coal combustion ash: An overview

“…FTIR spectroscopy is typically used for the study of surface functional groups -for their occurrence as well as changes in composition during incomplete combustion (and UC creation) [92,186,155,206]. Broad absorption bands typically present in most coals at 3200-3400 cm −1 (and assigned to hydroxyl groups) decreases during the combustion, and in UC it is nearly absent, indicating that alcoholic and phenolic groups were not so abundant there as in the parent coal [99].…”

Influence of Liming on Kinetics of Sewage Sludge Pyrolysis

“…The addition of lime changes composition of SS and also can influence the kinetic behavior of SS during its thermal treatment. Cízkova et al [4] studied pyrolysis of sludge without liming and limed sludge. Their results of laboratory pyrolysis proved that limed sludge released the maximum amount of carbon -55.4 %, while sludge without liming released only 48.9 %.…”