Carbon reclamation from biogas plant flue gas for immobilizing lead and neutralizing alkalis in municipal solid waste incineration fly ash
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Chemical Engineering Journal 435 (2022) 134812 Available online 30 January 2022 1385-8947/© 2022 Elsevier B.V. All rights reserved. Carbon reclamation from biogas plant flue gas for immobilizing lead and neutralizing alkalis in municipal solid waste incineration fly ash Zihan Zhu a , Yanyan Guo a , Youcai Zhao a , b , Tao Zhou a , b , * a The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China b Shanghai Institute of Pollution Control and Ecological Security, 1515 North Zhongshan Rd. (No. 2), Shanghai 200092, China A R T I C L E I N F O Keywords: Actual flue gas Alkali neutralization CO 2 sequestration Lead immobilization Municipal solid waste incineration fly ash A B S T R A C T Immobilizing heavy metal lead (Pb) and controlling alkalinity are crucial for municipal solid waste incineration fly ash (MSWI-FA) while carbon emission from incineration flue gas has hardly peaked yet. In this study, an actual flue gas from biogas plant was used for stabilizing Pb and neutralizing alkalis in MSWI-FA. Results indicated that carbonation process further incremented the Pb immobilization rate by 58.99%–95.66% based on agent treatment. With increasing carbonation time to 4.5 h, the unstable exchangeable fraction tended to zero, contributing to a leaching decrease of Pb correlated with pH, except in a strongly acidic environment. The formation of calcium carbonate boundary layer made Pb leachability less susceptible to the influence from curing time, while reduced the leaching pH to standard-satisfied 8.80. After the carbonation, 0.13 g CO2 /g MSWI-FA was calculated as the theoretical carbon dioxide (CO 2 ) capture capacity, with a cost reduction of 5.5% compared to direct agent treatment. All the results demonstrated that the flue gas carbonation combined with agent stabili- zation was a promising choice for MSWI-FA treatment due to the upgrade of economy and downgrade of carbon emission. Download 2.53 Mb. Do'stlaringiz bilan baham: |
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