Degradation of PCDD/Fs from incineration of waste at low temperatures for resource utilization of fly ash

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Feb. 4, 2025

Municipal solid waste incineration fly ash (MSWIFA) is of great value in resource utilization. Harmless pretreatment a crucial prerequisite for the utilization MSWIFA. The detoxification process step harmless This includes polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), which are among most toxic substances to humans other living organisms. Low-temperature degradation technology has broad prospects engineering applications due advantages low technical difficulty operating costs. work conducts pilot test on 17 PCDD/Fs MSWIFA at temperatures. investigates effects reaction temperature oxygen content Furthermore, based perspective utilization, an analysis proposal made judge effect low-temperature thermal treatment Further, taking soil sludge field as application scenario, feasibility after analyzed. flotation markedly reduces both carbon levels hydrothermal method facilitates dioxins while introducing significantly lowers required treatment. can enhance rate reduce demands equipment. results indicate that effectively degrade MSWIFA, satisfying requirements some scenarios. Notably, evaluating should satisfy residue different industries achieve certain detoxication efficiency.

Language: Английский

Study on the Destruction of PCDD/Fs and Synergistic Solidification of Heavy Metals in Fly Ash by Low-Temperature Pyrolysis with the Assistant of N-Doped Hierarchical Porous Carbon

Processes, Journal Year: 2025, Volume and Issue: 13(4), P. 1202 - 1202

Published: April 16, 2025

There is an urgent need for energy-efficient disposal and resource utilization of the fly ashes from municipal solid waste incineration (MSWI). The low-energy pyrolysis-based detoxification a prerequisite harmless treatment sustainable ashes. In this study, nitrogen-doped hierarchical porous carbon (NHPC) was prepared biomass-derived corn cobs used to enhance low-temperature destruction PCDD/Fs in MSWI ash. On thermal pure nitrogen (referring pyrolysis in) at 350 °C 30 min, removal efficiencies ash based on mass (ηmass) TEQ (ηTEQ) are 87.4% 76.2%, respectively. After 5 wt.% NHPC added ash, ηmass ηTEQ values can be increased 94.9% 90.2%. decomposition inhibit regeneration regulate structural properties optimize chemical environment It eliminate washing process. addition, leaching concentrations heavy metals such as Cu, Zn, Pb Cr experience significant reductions 83.3%, 73.7%, 35.6% 22.9% when pyrolyzed with NHPC. This finding suggests that cannot only facilitate but also immobilizes typical during pyrolysis. anticipated application great energy-saving effect tackle issues within single step.

Language: Английский