TY - JOUR
T1 - Hydrothermal solidification of municipal solid waste incineration bottom ash with slag addition
AU - Jing, Zhenzi
AU - Ran, Xianqiang
AU - Jin, Fangming
AU - Ishida, Hideki
N1 - Funding Information:
The work reported here was supported by the Shanghai Pujiang Program (China) (No. 08PJ14098 ), Shanghai Science and Technology Committee Program (China) (No. 09JC1413900 ), the National Natural Science Foundation of China (No. 50872096 ), and the Grand-in-Aid for Science Research for Japan Society for the Promotion of Science (No. 19404011 ).
PY - 2010/8
Y1 - 2010/8
N2 - 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.
AB - 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.
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U2 - 10.1016/j.wasman.2010.03.024
DO - 10.1016/j.wasman.2010.03.024
M3 - Article
C2 - 20385479
AN - SCOPUS:77953612502
VL - 30
SP - 1521
EP - 1527
JO - Waste Management
JF - Waste Management
SN - 0956-053X
IS - 8-9
ER -
