The bottom ash from municipal solid waste and sewage sludge co-pyrolysis technology: Characteristics and performance in the cement mortar and concrete

Abstract

To efficiently and environmentally treat the municipal solid waste (MSW), co-pyrolysis technology was further developed by adding high heat value substance of sewage sludge (SS). As the co-pyrolysis technology for MSW and SS has been popularly developed, the production of the bottom ash is constantly increased. The treatment and utilization of this part of bottom has become an urgent issue. This work investigated the basic characteristics of the co-pyrolysis bottom ash and evaluated the application possibility of the co-pyrolysis bottom ash as building materials. The co-pyrolysis bottom ash possessed high chemical contents of CaO + MgO/SiO2 + Al2O3 over 88 %. Excellent performance of comprehensive and flexural strength for cement mortar and concrete were realized with the co-pyrolysis bottom ash incorporated.