Journal
WASTE MANAGEMENT
Volume 130, Issue -, Pages 23-29Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2021.05.014
Keywords
Fly ash; Dechlorination; Lactic acid fermentation broth leaching; Water-insoluble chlorine
Categories
Funding
- National Key Research and Development Program of China [2016YFE0127800]
- National Natural Science Foundation of China [51778052]
- SinoUSJapan Joint Laboratory on Organic Solid Waste Resource and Energy Technology of USTB
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The study highlights the importance of leaching protocols (i.e. lactic acid addition amount and timing) in improving chlorine removal efficiency from fly ash by lactic acid fermentation broth. It suggests that reducing the thickness of the calcium salt precipitation layer or breaking the crystal structure of CaAlSiO4(OH) during the leaching process is essential for efficient dechlorination of fly ash.
As far as improvement of chlorine removal from fly ash by lactic acid fermentation broth (LAFB) was concerned, it is particularly important to explore the instinct mechanism and understand how leaching protocols (i.e. lactic acid addition amount and timing) affect the dechlorination efficiency. Results revealed that the WLL leaching protocol yielded the highest dechlorination efficiency (i.e. removed 98.7% of the total chlorine content of fly ash). The undissolved chlorine in fly ash residue might wrap inside the crystal structure of CaAlSiO4(OH). Given that the chlorine removal from fly ash might prohibit by the newly formed calcium salt precipitation, exclusively increase the addition amount of LAFB (i.e. LLL protocol) did not necessarily stimulate the dechlorination efficiency. Conversely, it might accelerate the fly ash mass reduction (compared with WLL protocol), resulting in a high chlorine content in fly ash residue. Therefore, instead of increasing lactic acid strength, reducing the thickness of the calcium salt precipitation layer or breaking the crystal structure of CaAlSiO4(OH) during the leaching process was suggested for efficient fly ash dechlorination. (C) 2021 Elsevier Ltd. All rights reserved.
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