Feasibility Analysis for Utilization of Sewage Sludge Incineration Ash as Cement Replacement

Title: Feasibility Analysis for Utilization of Sewage Sludge Incineration Ash as Cement Replacement
Author(s): Hua ZHANG, Lei PANG, Pinjing HE, Liming SHAO
Paper category : conference
Book title: 2nd International Conference on Waste Engineering and Management - ICWEM 2010
Editor(s): J.Zh. Xiao, Y. Zhang, M.S. Cheung and Reuben P. K. Chu
Print-ISBN: 978-2-35158-102-5
e-ISBN: 978-2-35158-103-2
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 332 - 339
Total Pages: 8
Nb references: 9
Language: English

Abstract: With the enhanced sewage collection and treatment ratio, the enormous production of sewage sludge is of increasing concern. Because of the advantages such as volume reduction, thermal destruction of organics and pathogens, and energy recovery, incineration has become an important sludge treatment strategy, which will produce ash byproduct. In this study, the feasibility of beneficial reuse of sludge incineration ash from a municipal wastewater treatment plant as cement replacement was studied. Its physico-chemical and leaching characteristics were analyzed. Mortars were fabricated using the ash with different cement replacement percentage, and the mechanical and long-term leaching behavior of these mortars were evaluated. The results showed that, the leaching concentrations of most elements from the incineration ash were below the limit values for non-hazardous waste. The mixing of sludge incineration ash with cement and other ingredients could stabilize the metals contained in the ash, but it will influence the mechanical strength of the mortars. The flexion and compression of the mortars decreased with the increasing percentage of the ash. The maximum replacement percentage would be better controlled less than 20%. Proper mixing of sludge incineration ash in cement could be a technically and environmentally feasible way for waste reuse and pollution control.

Online publication: 2011-01-25
Publication type : full_text
Public price (Euros): 0.00