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Structural and chemical changes of sludge derived pyrolysis char prepared under different process temperatures.
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SYSNO ASEP 0541619 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structural and chemical changes of sludge derived pyrolysis char prepared under different process temperatures. Author(s) Moško, Jaroslav (UCHP-M) RID, 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 number 105085 Source Title Journal of Analytical and Applied Pyrolysis. - : Elsevier - ISSN 0165-2370
Roč. 156, JUN 2021 (2021)Number of pages 9 s. Language eng - English Country NL - Netherlands Keywords sewage sludge ; pyrolysis ; sludge-char Subject RIV JE - Non-nuclear Energetics, Energy Consumption ; Use OECD category Energy and fuels Subject RIV - cooperation Institute of Plasma Physics - Non-nuclear Energetics, Energy Consumption ; Use
Institute of Rock Structure and Mechanics - Solid Waste and RecyclingR&D Projects QK21020022 GA MZe - Ministry of Agriculture (MZe) EF16_026/0008413 GA MŠk - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access with time embargo (01.07.2023) Institutional support UCHP-M - RVO:67985858 ; USMH-B - RVO:67985891 ; UFP-V - RVO:61389021 UT WOS 000663089700010 EID SCOPUS 85103753555 DOI 10.1016/j.jaap.2021.105085 Annotation Sewage 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.Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0319409
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