Release of metals from MSW I fly ash and availability in alkali condition

Journal Article · Tue Dec 31 04:00:00 EST 1996 · Waste Management

DOI:https://doi.org/10.1016/S0956-053X(96)00095-5· OSTI ID:544184

Mizutani, Satoshi; Yoshida, Tsuneyuki; Sakai, Shinichi; Takatsuki, Hiroshi ^[1]

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1. Kyoto Univ. (Japan). Environment Preservation Center

The release and availability of Pb, Cd, Cu, Zn from municipal solid waste (MSW) fly ash were studied with an emphasis on its behavior under alkaline conditions. Serial batch tests using acidic and alkaline solutions as leachant and a pH stat test were carried out. From the results of serial batch test: (1) Even if the ash comes into contact with strong acid for a long period, pH of the leachates from some fly ashes are high, and the concentration of Pb in the leachate is high. (2) When the ash comes into contact with the alkaline leachant, even if the fly ash has little alkalinity, the pH of the leachate soon increases and the concentration of the Pb and Zn in it are high. (3) The fact that leaching of heavy metals from fly ash depends on the pH of the leachate was certified. From the pH stat test: (1) The larger the liquid per solid ratio (L/S), the more metals are released. (2) Leaching behavior of Pb is different from other metals and leached in high concentration in alkali condition. (3) Concentration of metals in leachate is controlled not only by solubility but other factors and were certificated. Moreover, considering the properties of the ashes, the optional procedure of the availability test for Pb was proposed.

• OSTI ID: 544184
• Journal Information: Waste Management, Journal Name: Waste Management Journal Issue: 5-6 Vol. 16; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
CADMIUM
CHEMICAL PROPERTIES
COPPER
FLY ASH
INCINERATORS
LEACHING
LEAD
MUNICIPAL WASTES
PH VALUE
SOLID WASTES
WASTE PROCESSING
ZINC