Emission Behaviour And Hg Speciation
From Waste Incinerators
Author(s)
K. Yasuda, M. Yamagata, F. Takahashi & M. Kida
Abstract
The control of Hg emissions from waste incinerators is very important in Japan,
because more than 80% of organic waste is incinerated in this country. The Hg
content of the coal used in utility boilers is relatively low in Japan. However,
there are currently no regulations governing Hg in incineration gas. In this study,
the emission behaviour of Hg speciation in Japan and technology for controlling
Hg emissions, such as a Bag filter (BF) with activated carbon (AC) injection, are
discussed. The Hg speciation at the inlet to the BF has a very high percentage of
Hg2+ compared with Hg0. The average Hg emission coefficients from three
incinerators were 0.3g/t at a municipal solid waste incinerator, 0.2g/t at a sewage
sludge incinerator and 2.0g/t at an automobile shredder refuse incinerator,
respectively. The emission coefficient from the automobile shredder refuse
incinerator was especially high. The BF with AC injection removes over 95% of
the Hg2+.
Keywords: waste incinerator, Hg0, Hg2+, emission coefficient, control.
1 Introduction
Because of its high volatility, Hg is emitted into the atmosphere from both
anthropogenic and natural sources. Therefore, it enters oceans and terrestrial
waters directly from the atmosphere or even from its deposits in the surrounding
basin without a particular source of Hg [1]. Japan has passed the Basic Law for
Environmental Pollution Control, which is used as the basis for environmental
standards for public water supplies, and the \“Prevention of Water Pollution Act”,
which provides standards for effluents, in response to two reported cases of
Keywords
waste incinerator, Hg0, Hg2+, emission coefficient, control.
Related Book
Other papers in this volume
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