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Product Characteristics of Sludge Pyrolysis and Adsorption Performance of Metals by Char

Author

Listed:
  • Kuo-Hsiung Lin

    (Department of Environmental Engineering and Science, Fooyin University, Kaohsiung 831301, Taiwan)

  • Jiun-Horng Tsai

    (Department of Environmental Engineering, National Cheng Kung University, Tainan 701, Taiwan
    Research Center for Climate Change and Environment Quality, National Cheng Kung University, Tainan 701, Taiwan)

  • Zhi-Wei Chou

    (Department of Environmental Engineering and Science, Fooyin University, Kaohsiung 831301, Taiwan)

  • Hung-Lung Chiang

    (Department of Occupational Safety and Health, China Medical University, Taichung 406040, Taiwan
    Department of Safety Health and Environmental Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan)

Abstract

The microwave heating system was used for sludge pyrolysis. The raw sludge and KOH-immersed sludge were pyrolyzed and their product characteristics were determined. The research results are advantageous to understand the influence of KOH activation on characteristics of pyrolysis products and the adsorption performance of metals in char. In the case of a high temperature and high KOH dose, most of the lost mass from sludge pyrolysis was converted into gaseous products instead of oil. The heat values of liquid oils were 40.86–41.39 MJ kg − 1 , which has the potential for use as fuels. The use of a higher KOH dose for sludge pyrolysis is beneficial to the porosity development and generates a mesopore structure. The results from adsorption tests indicate that precipitation could be the dominant adsorption mechanism due to the binding between alkaline anion and carbonate and metal ions with a strong chemical affinity. The high KOH dose sludge adsorbent has a remarkable adsorption performance and can be used as adsorbent for the removal of the studied metals.

Suggested Citation

  • Kuo-Hsiung Lin & Jiun-Horng Tsai & Zhi-Wei Chou & Hung-Lung Chiang, 2021. "Product Characteristics of Sludge Pyrolysis and Adsorption Performance of Metals by Char," Sustainability, MDPI, vol. 13(21), pages 1-16, November.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:21:p:12125-:d:671211
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    References listed on IDEAS

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    2. Fytili, D. & Zabaniotou, A., 2008. "Utilization of sewage sludge in EU application of old and new methods--A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(1), pages 116-140, January.
    3. Lin, Kuo-Hsiung & Lai, Nina & Zeng, Jun-Yan & Chiang, Hung-Lung, 2020. "Microwave-pyrolysis treatment of biosludge from a chemical industrial wastewater treatment plant for exploring product characteristics and potential energy recovery," Energy, Elsevier, vol. 199(C).
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