Effect of Potassium Ferrate as a Dewatering Conditioner on Sludge Pyrolysis Characteristics and the Releasing Characteristics of Nitrogen, Sulfur, and Chlorine during Sewage Sludge Pyrolysis

Sludge pyrolysis is a promising method for treating excess sludge as by-product of municipal sewage plants, allowing energy self-sufficiency and resource recovery. Before begins, few conditioning agents are added to the that promote dewatering. Potassium ferrate (K2FeO4) applied agent with both cracking flocculation effects, but effects K2FeO4 on release characteristics nitrogen, sulfur, chlorine during have not been elucidated. In this study, we analyzed chemical state changes N, S, Cl contaminants in dewatered after before pyrolysis. Further, condensable/noncondensable gases were assessed using thermogravimetric mass spectrometry (TG-MS) pyrolysis–gas chromatography/mass (Py-GC/MS) analyses conditioning. We found potassium pertechnetate reduced activation required process. Noticeably process made more susceptible thermal decomposition leading volatile production also influenced different generated by Moreover, promoted C/H/O N/S/Cl pollutant from sludge. Overall, study provides theoretical basis selection dewatering steps