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Comparison of pyrochar, hydrochar and lignite as additive in anaerobic digestion and NH4+ adsorbent
Ruhr University Bochum, Thermodynamics, Universitätsstraße 150, Bochum, 44780, Germany.
Bochum University of Applied Science, Thermodynamics, Bochum, 44801, Germany.
Ruhr University Bochum, Thermodynamics, Universitätsstraße 150, Bochum, 44780, Germany.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-5014-3275
2022 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 361, article id 127674Article in journal (Refereed) Published
Abstract [en]

The impact of pyrochar, hydrochar and lignite addition on anaerobic digestion of food waste was investigated with and without ammonia inhibition under batch conditions. Furthermore, ammonium adsorption capacities of the chars were investigated. To determine anaerobic degradation of char, reference samples containing inoculum and char were analyzed, indicating a significant degradation of hydrochar. Depending on the evaluation method, the increase in methane yield due to hydrochar addition varied between no statistically significant difference and +14 %. No significant impact due to the addition of 5 g/l pyrochar and lignite on AD was found. NH4+ adsorption capacities showed a significantly higher net adsorption capacity of lignite (1.58 mgNH4+/gL), compared to pyrochar (0.63 mgNH4+/gPC). A negative NH4+ adsorption capacity (−0.51 mgNH4+/gHC) was found for hydrochar. A high H/C-ratio, O/C-ratio and cation exchange capacity of hydrochar and lignite indicate many functional groups and low chemical stability, enabling an increased interaction between NH4+ and char.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 361, article id 127674
Keywords [en]
Ammonia inhibition, Ammonium adsorption, Biochar, BMP, Char characterization
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:mdh:diva-59807DOI: 10.1016/j.biortech.2022.127674ISI: 000879106700003PubMedID: 35878777Scopus ID: 2-s2.0-85135701451OAI: oai:DiVA.org:mdh-59807DiVA, id: diva2:1690265
Available from: 2022-08-25 Created: 2022-08-25 Last updated: 2023-04-12Bibliographically approved

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Schwede, Sebastian

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