Reuse of Municipal Incinerator Bottom Ash as Road Base Material and on Site Environmental Monitoring
Date Issued
2007
Date
2007
Author(s)
Wu, Pei-Hsun
Abstract
Re-utilization of incinerator bottom ash was already considered many years ago. A possibility of reusing bottom ash was actually being taken into account in some European countries. Because the bottom ash material has engineering properties and low assessment of the environmental effect, it is possible to use the bottom ash as an aggregate substitute in road construction element. So we had an experimental road which used incinerated bottom ash as aggregate material in Wanli Township, Taipei County and monitored the environment in Wanli. Moreover, the study also simulated the leaching of acid rain and analyzed leaching solution of bottom ash.n the total amount of heavy metal, Cu (2800~7700 mg/kg) and Zn (2700~4200 mg/kg) were highest, second was Pb (900~1700 mg/kg). There are two parts of the simulated experiment. One is dynamic column test and the other is semi-dynamic leaching test. In both two simulated experiment, they are aimed to find out the concentration of heavy metal, TOC and Cl- which were the largest in the beginning and were lower as time goes. There was trace dissolution about 10 days later and accumulation of heavy metal which was present to be small concentration (Cu<180 mg/kg; Pb<140 mg/kg) as compared with total amount of heavy metal. Not only were the leaches of TOC and Cl- reduced about a half after the washing process but also the leaches of heavy metal were also lower after the washing process. On site, the monitoring of environment included the leaching of road, ground water, washing water of road surface, and rainfall. The value of pH, conductivity, TOC and Cl- in road tended to be small and stable. Furthermore, all value of heavy metal was not significant.t has been almost two years equal to 16 days in column test since the road established. It was similar to contrast the result of simulated experiment in laboratory and on site environmental monitoring.
Subjects
incinerator bottom ash
road
leaching test
monitoring
reuse
Type
thesis
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