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Recycling Possibility of the Salty Food Waste by Pyrolysis and Water Scrubbing

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  • Ye-Eun Lee

    (Division of Environment and Plant Engieering, Korea Institute of Civil Engineering and Building Technology 283, Goyang-daero, Ilsanseo-gu Goyang-si, Gyeonggi-do 10223, Korea
    Department of Construction Environment Engineering, University of Science and Technology, 217, Gajeong-ro, Yuseong-gu, Daejeon KS015, Korea)

  • Jun-Ho Jo

    (Division of Environment and Plant Engieering, Korea Institute of Civil Engineering and Building Technology 283, Goyang-daero, Ilsanseo-gu Goyang-si, Gyeonggi-do 10223, Korea)

  • Sun-Min Kim

    (Division of Environment and Plant Engieering, Korea Institute of Civil Engineering and Building Technology 283, Goyang-daero, Ilsanseo-gu Goyang-si, Gyeonggi-do 10223, Korea)

  • Yeong-Seok Yoo

    (Division of Environment and Plant Engieering, Korea Institute of Civil Engineering and Building Technology 283, Goyang-daero, Ilsanseo-gu Goyang-si, Gyeonggi-do 10223, Korea)

Abstract

Salty food waste is difficult to manage with previous methods such as composting, anaerobic digestion, and incineration, due to the hindrance of salt and the additional burden to handle high concentrations of organic wastewater produced when raw materials are cleaned. This study presents a possibility of recycling food waste as fuel without the burden of treatment washing with water by pyrolyzing and scrubbing. For this purpose, salty food waste with 3% NaCl was made using 10 materials and pyrolysis was conducted at temperature range between 200–400 °C. The result was drawn from elementary analysis (EA), X-ray photoelectron spectroscopy (XPS) analysis, atomic absorption spectrophotometry (AAS) analysis, water quality analysis and calorific value analysis of char, washed char, and washing water. The result of the EA showed that NaCl in food waste could be volatilized at a low pyrolysis temperature of 200–300 °C and it could be concentrated and fixed in char at a high pyrolysis temperature of 300–400 °C. The XPS analysis result showed that NaCl existed in form of chloride. Through the Na content result of the AAS analysis, NaCl remaining in char after water scrubbing was determined to be less than 2%. As the pyrolysis temperature increased, the chemical oxygen demand (COD) value of scrubbing water decreased rapidly, but the total phosphorus and nitrogen contents decreased gradually. The cleaned pyrolysis char showed an increase of higher heating value (HHV) approximately 3667–9920 J/g due to the removal of salt from the char and, especially at 300–400 °C, showed a similar HHV with normal fossil fuels. In conclusion, salty food waste, which is pyrolyzed at a temperature of 300–400 °C and cleaned by water, can be utilized as high-energy refuse derived fuel (RDF), without adverse effects, due to the volatilization of Cl and an additional process of contaminated water.

Suggested Citation

  • Ye-Eun Lee & Jun-Ho Jo & Sun-Min Kim & Yeong-Seok Yoo, 2017. "Recycling Possibility of the Salty Food Waste by Pyrolysis and Water Scrubbing," Energies, MDPI, vol. 10(2), pages 1-13, February.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:2:p:210-:d:90147
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    References listed on IDEAS

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    1. Saidur, R. & Abdelaziz, E.A. & Demirbas, A. & Hossain, M.S. & Mekhilef, S., 2011. "A review on biomass as a fuel for boilers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(5), pages 2262-2289, June.
    2. Ahmed, I.I. & Gupta, A.K., 2010. "Pyrolysis and gasification of food waste: Syngas characteristics and char gasification kinetics," Applied Energy, Elsevier, vol. 87(1), pages 101-108, January.
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    1. Veknesh Arumugam & Ismail Abdullah & Irwan Syah Md Yusoff & Nor Liza Abdullah & Ramli Mohd Tahir & Ahadi Mohd Nasir & Ammar Ehsan Omar & Muhammad Heikal Ismail, 2021. "The Impact of COVID-19 on Solid Waste Generation in the Perspectives of Socioeconomic and People’s Behavior: A Case Study in Serdang, Malaysia," Sustainability, MDPI, vol. 13(23), pages 1-11, November.
    2. Ye-Eun Lee & Jun-Ho Jo & I-Tae Kim & Yeong-Seok Yoo, 2018. "Value-Added Performance and Thermal Decomposition Characteristics of Dumped Food Waste Compost by Pyrolysis," Energies, MDPI, vol. 11(5), pages 1-14, April.
    3. Ye-Eun Lee & Dong-Chul Shin & Yoonah Jeong & I-Tae Kim & Yeong-Seok Yoo, 2019. "Effects of Pyrolysis Temperature and Retention Time on Fuel Characteristics of Food Waste Feedstuff and Compost for Co-Firing in Coal Power Plants," Energies, MDPI, vol. 12(23), pages 1-14, November.

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