Hydrothermal solidification of municipal solid waste incineration bottom ash with slag addition

Zhenzi Jing, Xianqiang Ran, Fangming Jin, Hideki Ishida

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Hydrothermal solidification of municipal solid waste incineration (MSWI) bottom ash has been carried out under saturated steam pressure (1.56. MPa) at 200 °C for up to 24. h by mixing quartz, slaked lime and water-cooled blast furnace slag (WBFS). The strength enhancement for the WBFS addition was best. The strength development was shown to be due mainly to tobermorite formation, and the tobermorite formation densified matrix, thus promoting the strength development. WBFS seemed to have a higher reactivity than the quartz during the initial hydrothermal process, which provided more silica available to harden the solidified specimens. However, a longer curing time (24. h) was favorable to the quartz dissolution for tobermorite formation, which in turn, enhanced the strength for quartz addition. Curing time affected the crystal morphology evolution, and the stubby plate of tobermorite seemed to result in a high strength enhancement in this study. Laboratory leaching tests were conducted to determine the amount of heavy metals dissolved from the final solidified specimens, and the leaching results showed that after hydrothermal processing the heavy metals dissolved from the solidified specimens were reduced effectively. As such, the hydrothermal processing may have a high potential for recycling/reusing MSWI ash on a large scale.

Original languageEnglish
Pages (from-to)1521-1527
Number of pages7
JournalWaste Management
Volume30
Issue number8-9
DOIs
Publication statusPublished - 2010 Aug

ASJC Scopus subject areas

  • Waste Management and Disposal

Fingerprint Dive into the research topics of 'Hydrothermal solidification of municipal solid waste incineration bottom ash with slag addition'. Together they form a unique fingerprint.

Cite this