LAPSE:2021.0742
Published Article
LAPSE:2021.0742
Demineralization of Food Waste Biochar for Effective Alleviation of Alkali and Alkali Earth Metal Species
Yoonah Jeong, Ye-Eun Lee, Dong-Chul Shin, Kwang-Ho Ahn, Jinhong Jung, I-Tae Kim
September 22, 2021
Ash-related issues from a considerable amount of alkali and alkaline earth metal species in biochar are major obstacles to the widespread application of biomass in thermoelectric plants. In this study, food wastes were converted into biochar through pyrolysis at 450 °C or 500 °C and four different demineralization approaches, using deionized water, citric acid, nitric acid, and CO2 saturated water. The chemical properties of the resulting biochars were investigated, including proximate analysis, concentrations of inorganic species in biochar and ash, and the crystalline structure. All demineralization treatments produced food waste biochar with sufficient calorific value (>4000 kcal/kg) and a chlorine concentration <0.5%. Among the inorganic species in biochar, Na and K exhibited a significantly higher removal rate through demineralization, which ranged from 54.1%−85.6% and 53.6%−89.9%, respectively; the removal rates of Ca and Mg were lower than 50.0%. The demineralization method was more critical than the pyrolysis temperature in the removal of alkali and alkaline earth metals. Especially, the lower slagging and fouling tendency was expected for the biochar demineralized with citric acid. Our results suggested that food waste biochar pyrolyzed at 500 °C and demineralized with citric acid is a promising co-firing material for electric power generation in thermoelectric power plants.
Keywords
AAEM, ash, biochar, demineralization, food waste, pyrolysis
Suggested Citation
Jeong Y, Lee YE, Shin DC, Ahn KH, Jung J, Kim IT. Demineralization of Food Waste Biochar for Effective Alleviation of Alkali and Alkali Earth Metal Species. (2021). LAPSE:2021.0742
Author Affiliations
Jeong Y: Environmental Resource Research Center, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea
Lee YE: Environmental Resource Research Center, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea [ORCID]
Shin DC: Environmental Resource Research Center, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea
Ahn KH: Environmental Resource Research Center, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea
Jung J: Environmental Resource Research Center, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea
Kim IT: Environmental Resource Research Center, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea [ORCID]
Journal Name
Processes
Volume
9
Issue
1
First Page
pr9010047
Year
2020
Publication Date
2020-12-28
Published Version
ISSN
2227-9717
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PII: pr9010047, Publication Type: Journal Article
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LAPSE:2021.0742
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doi:10.3390/pr9010047
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Sep 22, 2021
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Sep 22, 2021
 
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Calvin Tsay
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