Leaching Behavior of Untreated and Phosphate Treated Fly Ash from Municipal Solid Waste Melting Facilities and Minerals Formed in Phosphate Treated Fly Ash

Leaching Behavior of Untreated and Phosphate Treated Fly Ash from Municipal Solid Waste Melting Facilities and Minerals Formed in Phosphate Treated Fly Ash

Kiyoharu Furukawa*, Akira Uchibo*, Toshihito Uchida*, Ichirou Itou*, Tsuneyuki Yoshida*, Humiaki Kambayashi**, Seiichi Abe** and Masayuki Kokado***

* KURITA Water Industries LTD.
** KUBOTA Corporation.
*** The Tokyo Metropolitan Research Institute for Waste Management

+ Correspondence should be addressed to Toshihito Uchida:
(4-7 Nishishinjuku 3-chome, Shinjuku-ku, Tokyo 160-8383 Japan)

Abstract

An availability test, a pH-dependent test and a Japanese leaching test were applied to untreated and phosphate treated fly ash from municipal solid waste melting facilities in order to determine the leaching potential and behavior of metals. The results of the leaching tests show that the treated fly ash had a lower leaching potential and releaserate of metals than untreated fly ash. XRD analysis revealed that chloropyromorphite (Pb5 (PO4) 3Cl) was formed in the treated fly ash.

Key words: municipal solid waste melting fly ash, phosphate treated, leaching test, metals, Pb5 (PO4) 3Cl