期刊
RENEWABLE ENERGY
卷 175, 期 -, 页码 108-118出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.05.018
关键词
Digestate; Hydrothermal carbonisation; Hydrochar; Porosity; SEM
资金
- European Commission
- National Center for Research and Development (Poland)
- Nederlandse Organisatie Voor Wetenschappelijk Onderzoek (Netherlands)
- Swedish Research Council Formas
- National Center for Research and Development [WATERWORKS2017/I/RECOWATDIG/01/2019]
- European Union from the European Social Fund [POWR.03.05.00-00-Z307/17-00]
Digestate is a nutrient-rich substance produced by anaerobic digestion, which can be utilized as a solid biofuel, soil amendment substance, or substrate for activated carbon production. Hydrothermal carbonisation (HTC) is investigated as a pre-treatment method for digestate, resulting in changes in physical and chemical properties of the hydrochars.
Digestate is a nutrient-rich substance produced by anaerobic digestion that contains organic, inorganic, and biological matter. The European Nitrates Directive (91/676/EEC) provides regulations regarding the wider implementation of the digestate. Owing to a significant amount of organic matter in the digestate, it can be utilised as a solid biofuel, soil amendment substance, or substrate for activated carbon pro-duction. However, the solid by-products of the anaerobic digestion of the municipal solid waste wet fraction cannot be used for such applications because it is still considered a waste. Hydrothermal car-bonisation (HTC) was investigated as a pre-treatment method for the digestate obtained by anaerobic digestion of the municipal solid waste wet fraction. HTC was carried out at temperatures of 180, 200 and 230 degrees C and residence times of 30, 60 and 120 min. The value of pressure was determined based on water temperature and partial pressure of the gaseous by-products. The HTC process resulted in changes in the physical and chemical properties of the hydrochars compared to those of the raw materials. A temper-ature of 200 degrees C and residence time of 60 min during HTC were optimal for energy consumption; this hydrochar exhibited the best combustion parameters and physical properties (specific surface area). (C) 2021 The Author(s). Published by Elsevier Ltd.
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