Municipal incineration bottom ash treatment using hydrothermal solidification.
Solidification of municipal incineration bottom ash (MIBA) has been carried out using a hydrothermal processing method, in which the MIBA was first compacted in a mold at 5-20 MPa, and then hydrothermally cured in an autoclave under saturated steam pressure at 150-250 degrees C for 10-72 h. Experimental results showed that the tensile strength of the solidified body was greatly influenced by the addition of NaOH solution and fresh cement in the MIBA. The hydrothermal curing temperature and time exerted a significant influence on the development of tensile strength of solidified body. The strength development is speculated to be due primarily to the formation of 1.1 nm tobermorite. Laboratory leaching tests were conducted to determine the amount of heavy metals dissolved from the solidified bodies and the results showed that under the hydrothermal conditions of this study the leaching of heavy metals was very low. As such, the hydrothermal processing method may have a high potential for recycling MIBA.
Jing
Zhenzi
Z
Graduate School of Environmental Studies, Tohoku University, Aoba20, Aoba-ku Sendai 980 8579, Japan. jing@mail.kankyo.tohoku.ac.jp
Matsuoka
Norihisa
N
Jin
Fangming
F
Hashida
Toshiyuki
T
Yamasaki
Nakamichi
N
D006358:Hot Temperature; D017745:Incineration; D018505:Waste Management; D014867:Water
D014867:Water