The Environmental Monitoring of a Road Application with Incineration Bottom Ash
Date Issued
2008
Date
2008
Author(s)
Lu, Yo-Yu
Abstract
In Taiwan, approximately 900 thousand tons of bottom ash produced form municipal solid waste incinerator (MSWI) each year. The application of bottom ash as the road pavement is widely used around the world. The environmental impact on these applications were unclear. In our study, laboratory experiments and on site monitoring were conducted in Wanli Township, Taipei Country. Heavy metals and organic halides (TOX) were monitored form the experimental site. he results showed that heavy metals leaching form the road site which was constructed 2.5 years ago, especially for copper and barium. Form August 2007 to the end of February 2008, about 0.133 mg-Ba/kg-ash and 0.047 mg-Cu/kg-ash was from the site. Compare the results form previous years, the concentrations of Cr, Pb, Cd and As were decreasing gradually. In column tests, bottom ash leached about 70 mg-Ba/L, 21 mg-Pb/L and 20 mg-Cu/L after washing with 30 liters of buffer. The pH value of washed buffer affects the leaching of total organic chloride, it approximately 35 mg/kg of TOX by using pH 3 and pH 7 washing buffer. The 30 liters of washing buffer volume in column test was equilibrant to three years of rainfall in Wanli Township. Some species of organic chloride were produced by the incubation of washing buffer and on-site soil. It is possible that chloride leached form incineration bottom ash could react with organic matter in the soil.
Subjects
incinerator bottom ash
road
organic chloride
heavy metal
leaching
Type
thesis
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