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Stabilization of High-Organic-Content Water Treatment Sludge by Pyrolysis

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  • Ye-Eun Lee

    (Division of Environment and Plant Engineering, Korea Institute of Civil Engineering and Building Technology 283, Goyang- daero, Ilsanseo-gu Goyang-si, Gyeonggi-do 10223, Republic of Korea
    Department of Construction Environment Engineering, University of Science and Technology, 217, Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea)

  • I-Tae Kim

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

  • Yeong-Seok Yoo

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

Abstract

Water treatment sludge from algal blooms were analyzed and compared with general water treatment sludge as the pyrolysis temperature was varied from 300 °C to 900° C. Elemental analysis showed that the water treatment sludge in the eutrophication region has ~12% carbon content, higher than that (8.75%) of general water treatment sludge. X-ray diffraction (XRD) analysis of both types of sludge showed that amorphous silica changed to quartz and weak crystalline structures like kaolinite or montmorillonite were decomposed and changed into stronger crystalline forms like albite. Fourier transform infrared spectroscopy (FT-IR) peaks of humic/fulvic acid that indicated the affinity to combine with heavy metals disappeared above 700 °C. Toxicity characteristic leaching procedure (TCLP), conducted to determine the heavy metal leaching amount of pyrolyzed water treatment sludge, showed the lowest value of 5.7 mg/kg at 500 °C when the humic acid was not decomposed. At 500 °C, the heavy metal leaching ratio to the heavy metal content of high organic content water treatment sludge and low organic content water treatment sludge were 1.87% and 3.19%, respectively, and the water treatment sludge of higher organic content was more stable. In other words, pyrolysis of water treatment sludge with high organic content at 500 °C increases the inorganic matter crystallinity and heavy metal leaching stability.

Suggested Citation

  • Ye-Eun Lee & I-Tae Kim & Yeong-Seok Yoo, 2018. "Stabilization of High-Organic-Content Water Treatment Sludge by Pyrolysis," Energies, MDPI, vol. 11(12), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:12:p:3292-:d:185463
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    References listed on IDEAS

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    1. Johannes Lehmann, 2007. "A handful of carbon," Nature, Nature, vol. 447(7141), pages 143-144, May.
    2. Chamseddine Guizani & Mejdi Jeguirim & Sylvie Valin & Lionel Limousy & Sylvain Salvador, 2017. "Biomass Chars: The Effects of Pyrolysis Conditions on Their Morphology, Structure, Chemical Properties and Reactivity," Energies, MDPI, vol. 10(6), pages 1-18, June.
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    Cited by:

    1. Jumoke Oladejo & Kaiqi Shi & Xiang Luo & Gang Yang & Tao Wu, 2018. "A Review of Sludge-to-Energy Recovery Methods," Energies, MDPI, vol. 12(1), pages 1-38, December.

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