Journal
WASTE MANAGEMENT
Volume 103, Issue -, Pages 260-267Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2019.12.028
Keywords
PCDD/Fs; Heavy metals; Mass distribution; Sintering; Fly ash
Categories
Funding
- GEF project Environmentally Sound Management and Disposal of POPs Pesticide and Other POPs Wastes in China
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A recycling and disposal technology for municipal solid waste incinerator (MSWI) fly ash using high temperature sintering process was evaluated in an industrial scale facility with daily disposal capacity of 100 t/d. The emission, mass balance and distribution characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) as well as heavy metals (HMs) were assessed during two test runs. The PCDD/Fs emission from stack varied in range of 0.019 to 0.025 ng I-TEQ /Nm(3), below international standards. The PCDD/Fs in the sintered product was reduced to 0.002-0.008 mu g I-TEQ/kg from 2.593 to 2.704 mu g I- TEQ/kg of the original MSWI fly ash (Mix-FA). However high concentration of 14.3 mu g I-TEQ/kg were found in the secondary fly ash (Sec-FA). Therefore, a large share of PCDD/Fs just desorbed from the ash and the destruction efficiency (DRE) for PCDD/Fs was only 8.9%. The distribution characteristics of investigated HMs were primarily dependent on the evaporative properties. The results of HMs leaching test for the sintered product were considerably below the Chinese legal limits. The HMs leaching toxicity test for Sec-FA indicated which is a hazardous waste presented high risk to the environment. The use of the sintered product as construction material need further assessment on its long term HMs leaching behavior. (C) 2019 Elsevier Ltd. All rights reserved.
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