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Structural and chemical changes of sludge derived pyrolysis char prepared under different process temperatures.

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    SYSNO ASEP0541619
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleStructural and chemical changes of sludge derived pyrolysis char prepared under different process temperatures.
    Author(s) Moško, Jaroslav (UCHP-M) ORCID, SAI
    Pohořelý, Michael (UCHP-M) RID, ORCID, SAI
    Skoblia, S. (CZ)
    Fajgar, Radek (UCHP-M) RID, ORCID, SAI
    Straka, Pavel (USMH-B) RID, ORCID
    Soukup, Karel (UCHP-M) RID, SAI, ORCID
    Beňo, Z. (CZ)
    Farták, J. (CZ)
    Bičáková, Olga (USMH-B) RID, ORCID, SAI
    Jeremiáš, Michal (UFP-V) ORCID
    Šyc, Michal (UCHP-M) RID, SAI, ORCID
    Meers, E. (BE)
    Article number105085
    Source TitleJournal of Analytical and Applied Pyrolysis. - : Elsevier - ISSN 0165-2370
    Roč. 156, JUN 2021 (2021)
    Number of pages9 s.
    Languageeng - English
    CountryNL - Netherlands
    Keywordssewage sludge ; pyrolysis ; sludge-char
    Subject RIVJE - Non-nuclear Energetics, Energy Consumption ; Use
    OECD categoryEnergy and fuels
    Subject RIV - cooperationInstitute of Plasma Physics - Non-nuclear Energetics, Energy Consumption ; Use
    Institute of Rock Structure and Mechanics - Solid Waste and Recycling
    R&D ProjectsQK21020022 GA MZe - Ministry of Agriculture (MZe)
    EF16_026/0008413 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    Method of publishingOpen access with time embargo (01.07.2023)
    Institutional supportUCHP-M - RVO:67985858 ; USMH-B - RVO:67985891 ; UFP-V - RVO:61389021
    UT WOS000663089700010
    EID SCOPUS85103753555
    AnnotationSewage sludge was pyrolyzed at 400–800 ◦C to study the influence of the pyrolysis temperature on the bulk and structural properties of the resulting sludge-chars. For this purpose, sludge-chars were subjected to proximate and ultimate analyses and the textural and porous properties were examined by the nitrogen adsorptiondesorption isotherm. Raman spectroscopy was employed to correlate the results of the structural changes of the sludge-chars obtained by conventional analysis (textural properties) and together with solid state NMR it was used to characterize the organic part of the sludge-chars. Additionally, an XPS of the chars’ surfaces and inner layers of the char particles was conducted to study the phosphorus, nitrogen and sulfur speciation and its changes with regard to the change in pyrolysis temperature and the depth of the char particles. Raising the pyrolysis temperature increased the relative content of phosphates and metaphosphates and decreased the reduced P species relative content. Sulfur speciation analysis revealed an increase in sulfides content and a decrease in
    sulfates and sulfites content as the temperature was raised. The influence of the temperature on N speciation was marginal. The NMR and Raman spectroscopy results showed a significant contribution of graphite and (poly) aromatic hydrocarbons and a negligible contribution of the carbonyl groups to the structure of the organic part of sludge-chars. The increase in the pyrolysis temperature increased the content of (poly)aromatic hydrocarbons over the total carbon content, revealing its contribution to the porosity evolution. This is in good correlation with
    the microporosity and surface area analyses. Regarding the sludge-char potential soil application, the results may help to predict and better understand the sludge-char stability and N and P plant availability.
    WorkplaceInstitute of Chemical Process Fundamentals
    ContactEva Jirsová,, Tel.: 220 390 227
    Year of Publishing2022
    Electronic address
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