Examination on Control of Heavy Metals Elution from the Shredder dust Incineration Ashes and Fly Ashes Using Chemicals

Kohji Kakimoto*, Yasuko Nakano* and Yasuhiko Kato**
* Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology
** Professor Emeritus of Kyushu Institute of Technology
+ Correspondence should be addressed to Kohji Kakimoto:
(1-1 Sensuicho, Tobata-ku, Kitakyushu-city, Fukuoka 804-8550 Japan)

Abstract
Shredder dust is a residue from valuable ferrous metals found in auto-scrap and old electrical appliances, and is industrial waste product which must be disposed of in regulated landfills. As a result of leaching test for the shredder dust according to the Notice Standard of the Environmental Agency, the test results have revealed that an arising of unavoidable problems, such as impossibility of landfill without any chemical treatment because of a lot of leaching from heavy metals, shortage of dust site, and volume reduction including leaching restriction.
Furthermore the following studies are carried out how the volume reduction is able to be improved by the incineration of shredder dust, and how the leaching restraint from heavy metals is able to be accomplished through the chemical treatment with mixed chemicals and cement. With the result that the combined use of Alkali carbonate and cement together with shredder dust's incineration ash and fly ash has enabled to restrain leaching from heavy metals including the lead.

Key words: shredder dust, chemical treatment, heavy metals, leaching test, volume reduction