Wet extraction of heavy metals and chloride from MSWI and straw combustion fly ashes
- Hamburg University of Technology, Institute of Environmental Technology and Energy Economics, Eissendorfer Street 40, D-21073 Hamburg (Germany)
- Vattenfall Research and Development AB, SE-814 26 Alvkarleby (Sweden)
Fly ash residues from combustion often do not meet the criteria neither for reuse as construction materials nor landfilling as non-hazardous waste, mainly because of the high concentration of heavy metals and chlorides. This work aimed to technically evaluate an innovative wet treatment process for the extraction of chloride (Cl{sup -}), cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn) from fly ashes from a municipal solid waste incineration (MSWI) plant and from a straw combustion (SC) facility. Factors investigated were liquid/solid (L/S) ratio, full carbonation (CO{sub 2} treatment), influence of pH and leaching time, using a two-level full factorial design. The most significant factor for all responses was low pH, followed by L/S ratio. Multiple linear regression models describing the variation in extraction data had R{sup 2} values ranging from 58% to 98%. An optimization of the element extraction models was performed and a set of treatment conditions is suggested.
- OSTI ID:
- 21269363
- Journal Information:
- Waste Management, Journal Name: Waste Management Journal Issue: 9 Vol. 29; ISSN WAMAE2; ISSN 0956-053X
- Country of Publication:
- United States
- Language:
- English
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