Chemical Characteristics of Ash Formed from the Combustion of Shoe Manufacturing Waste in a 2.5 MWth Circulating Fluidized Bed Combustor

Niu, Miaomiao; Liu, Changqi; Wang, Xinye; Huang, Yaji; Dong, Lu; Duan, Lunbo; Xu, Ligang; Wang, Yongxing; Sun, Chenggong; Liu, Hao

Abstract

© 2019, Springer Nature B.V. Abstract: The ash formation behaviour and associated compositional characteristics of the combustion of shoe manufacturing waste (SMW) in a 2.5MWth pilot-scale circulating fluidized bed combustor (CFBC) were investigated to better understand the combustion behaviour and to find effective management strategy for the disposal of the ash streams produced. The compositional characterisations for the ashes produced from the pilot demonstrations showed the presence of a variety of trace heavy metals both in the fly ash and bottom ash. A pronounced uneven partitioning behaviour was observed on the distribution of these heavy metals between the fly ash and bottom ash, and it was found that all the heavy metals except chromium were preferentially enriched in the fly ash, with the contents of lead and cadmium in the fly ash being over 11 and 6 times higher than in the bottom ash. Leaching tests demonstrated that the concentrations of most of the aforementioned metals present in the leachates from the fly ash and bottom ash could meet the permissible limits for landfill disposal but with lead as an exception with its concentration in the fly ash leachates being over 2 times higher than the limit. The total PCDD and PCDF contents both in the fly ash and bottom ash were also much below the legal limit. To further understand the ash behaviour, the slagging and fouling tendency during SMW combustion in the CFBC was examined by use of the characterisation of the ash mineralogy and the results indicated that the SMW ash likely had low tendencies for slagging and fouling. The best two valorization routes for the SMW bottom ash and fly ash were recommended, one being to use them to produce colloidal silica medium to obtain safe inert filler and the other being to use them as the raw materials in the cement industry. Graphic Abstract: [Figure not available: see fulltext.].

Citation

Niu, M., Liu, C., Wang, X., Huang, Y., Dong, L., Duan, L., …Liu, H. (2020). Chemical Characteristics of Ash Formed from the Combustion of Shoe Manufacturing Waste in a 2.5 MWth Circulating Fluidized Bed Combustor. Waste and Biomass Valorization, 11, 4551–4560. https://doi.org/10.1007/s12649-019-00733-7

• Journal Article Type: Article
• Acceptance Date: Jun 25, 2019
• Online Publication Date: Jul 9, 2019
• Publication Date: 2020-08
• Deposit Date: Jul 15, 2019
• Publicly Available Date: Jul 10, 2020
• Journal: Waste and Biomass Valorization
• Print ISSN: 1877-2641
• Electronic ISSN: 1877-265X
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 11
• Pages: 4551–4560
• DOI: https://doi.org/10.1007/s12649-019-00733-7
• Keywords: Renewable Energy, Sustainability and the Environment; Environmental Engineering; Waste Management and Disposal
• Public URL: https://nottingham-repository.worktribe.com/output/2307350
• Publisher URL: https://link.springer.com/article/10.1007%2Fs12649-019-00733-7
• Additional Information: This is a post-peer-review, pre-copyedit version of an article published in Waste and Biomass Valorization. The final authenticated version is available online at: http://dx.doi.org/10.1007/s12649-019-00733-7