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Comparative characterisation and phytotoxicity assessment of biochar and hydrochar derived from municipal wastewater microalgae biomass
University of Edinburgh, UK.
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy. Umeå University, Sweden.ORCID iD: 0000-0003-3252-467X
Umeå University, Sweden.
University of Edinburgh, UK.
2023 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 386, article id 129567Article in journal (Refereed) Published
Abstract [en]

Microalgae, originating from a tertiary treatment of municipal wastewater, is considered a sustainable feedstock for producing biochar and hydrochar, offering great potential for agricultural use due to nutrient content and carbon storage ability. However, there are risks related to contamination and these need to be carefully assessed to ensure safe use of material from wastewater microalgae. Therefore, this study compared the properties and phototoxicity of biochar and hydrochar produced via pyrolysis and hydrothermal carbonisation (HTC) of microalgae under different temperatures and residence times. While biochar promoted germination and seedling growth by up to 11.0% and 70.0%, respectively, raw hydrochar showed strong phytotoxicity, due to the high content of volatile matter. Two post-treatments, dichloromethane (DCM) washing and further pyrolysis, proved to be effective methods for mitigating phytotoxicity of hydrochar. Additionally, biochar had 35.8–38.6% fixed carbon, resulting in higher carbon sequestration potential compared to hydrochar. © 2023 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd , 2023. Vol. 386, article id 129567
Keywords [en]
Carbonization, Dichloromethane, Microorganisms, Pyrolysis, Risk assessment, Wastewater treatment, Agricultural use, Biochar, Carbon storage, Comparative characterizations, Micro-algae, Municipal wastewaters, Nutrient contents, Property, Storage abilities, Tertiary treatment, biomass, carbon sequestration, germination, nutrient, phytotoxicity, wastewater, Microalgae
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:ri:diva-65929DOI: 10.1016/j.biortech.2023.129567Scopus ID: 2-s2.0-85166234174OAI: oai:DiVA.org:ri-65929DiVA, id: diva2:1791022
Note

Funding sponsor: Scottish Alliance for Geoscience, Environment and Society.

Available from: 2023-08-24 Created: 2023-08-24 Last updated: 2023-12-28Bibliographically approved

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Benavente, Verónica

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