로그인해주세요
ECCL에 오신것을 환영합니다!

(2024) Environmental Pollution_Sustainable valorisation of sewage sludge via carbon dioxide-assisted pyrolysis

(2024) Environmental Pollution_Sustainable valorisation of sewage sludge via carbon dioxide-assisted pyrolysis

 

Kim M.; Choi D.; Jung S.; Tsang Y.F.; Jeong S.; Kim Y.; Kwon E.E.

 

(Elsevier Ltd) Environmental Pollution ISSN: 2697491 Vol.358 Issue. Article No.124516 DOI: 10.1016/j.envpol.2024.124516

 

The escalating volume of sewage sludge (SS) generated poses challenges in disposal, given its potential harm to the environment and human health. This study explored sustainable solutions for SS management with a focus on energy recovery. Employing CO2-assisted pyrolysis, we converted SS into flammable gases (H2 and CO; syngas). Single-stage pyrolysis of SS in a CO2 conditions demonstrated that CO2 enhances flammable gas production (especially CO) through gas phase reactions (GPRs) with volatile matter (VM) at temperatures ≥520 °C. Specifically, the CO2 partially oxidized the VM released from SS and concurrently underwent reduction into CO. To enhance the syngas production at temperatures ≤520 °C, multi-stage pyrolysis setup with additional heat energy and a Ni/Al2O3 catalyst were utilized. These configurations significantly increased flammable gas production, particularly CO, at temperatures ≤520 °C. Indeed, the flammable gas yield in the catalytic pyrolysis of SS increased from 200.3 mmol under N2 conditions to 219.2 mmol under CO2 conditions, representing a 4.4-fold increase compared to single-stage pyrolysis under CO2 conditions (50.0 mmol). By integrating a water-gas-shift reaction, the flammable gases produced from CO2-assisted catalytic pyrolysis were expected to have the potential to generate revenue of US$4.04 billion. These findings highlight the effectiveness of employing CO2 in SS pyrolysis as a sustainable and effective approach for treating and valorising SS into valuable energy resources. © 2024 Elsevier Ltd

 

This research received support from the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (NRF-2023R1A2C3003011).  

Publication의 다른 글