This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via ISI Web of Science (1) Citing Articles via Google Scholar Google Scholar Articles by Kim, S.-Y. Articles by Tojo, Y. Search for Related Content PubMed Articles by Kim, S.-Y. Articles by Tojo, Y. Social Bookmarking                   What's this?

Leaching behaviour of elements and evaluation of pre-treatment methods for municipal solid waste incinerator residues in column leaching tests

Department of Environmental and Resource Engineering, Hokkaido University, Sapporo, Hokkaido, Japan, sykim{at}eng.hokudai.ac.jp

Nobutoshi Tanaka

Department of Environmental and Resource Engineering, Hokkaido University, Sapporo, Hokkaido, Japan

Toshihiko Matsuto

Department of Environmental and Resource Engineering, Hokkaido University, Sapporo, Hokkaido, Japan

Yasumasa Tojo

Department of Environmental and Resource Engineering, Hokkaido University, Sapporo, Hokkaido, Japan

Two new pre-treatment methods (water-washing/carbonation and carbonation/phosphate stabilization) of municipal solid waste (MSW) incinerator residues were evaluated by column leaching tests under aerobic conditions and anaerobic conditions (which were changed to aerobic conditions after 10 months). A mixture of bottom ash and fly ash (5: 1 ratio) was pre-treated using each method. Shredded incombustible residues (SIR) were added to each ash preparation in proportions similar to the ratios present in landfills. For comparison, landfill wastes typical of Japan, namely, a mixture of bottom ash, chelating-pre-treated fly ash, and SIR, were also examined. Leachate samples were collected periodically and analysed over a 15-month period. When compared with chelating pre-treatment, both water-washing/carbonation and carbonation/phosphate stabilization reduced the leaching of Pb, Al, and Cu by about one to two orders of magnitude. Moreover, the initial concentrations of Ca and Pb in leachates from column of water-washing/carbonation were 56-57% and 84-96% less than those from the column of carbonation/phosphate stabilization. Therefore, water-washing/carbonation was considered to be a promising approach to obtain early waste stabilization and to reduce the release of heavy metals to near-negligible levels. The leaching behaviour of elements was also discussed.

Key Words: Municipal solid waste incinerator residues • pre-treatment • water washing • carbonation • phosphate stabilization • heavy metals • column leaching tests • leaching behaviour • wmr 661-8

CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this?