Abstract Hydrothermal treatment is a promising option for pretreatment drying of organic waste, due to its low energy consumption and contribution to increasing fuel energy density. In this study, the characteristics of hydrothermally treated sewage sludge were investigated, and pyrolysis and steam gasification were performed with the sludge before and after hydrothermal treatment. The overall composition of product gases from treated sludge was similar to that obtained from steam gasification of wood chips, particularly under high-temperature conditions. In addition, the increase in lignin content of sewage sludge following hydrothermal treatment could help enhance methane yield in product gas during pyrolysis and steam gasification. The findings suggest that hydrothermal treatment is an appropriate method for improving sewage sludge for use as an alternative to biomass and fossil fuels.
Bibliographical noteFunding Information:
This study was funded by the Regional Center of Excellence (RCOE) program of the Korea Institute of Industrial Technology (Grant Number EO140016 ), and the project “Production of Fuel Additive for Transportation and Energy using Spent Black Liquor derived from Kraft Pulping Process,” funded by Ministry of Trade, Industry and Energy of Korea (Grant Number NS130041 ).
© 2015 Elsevier Ltd.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Fuel Technology
- Energy Engineering and Power Technology