NDLI: Hydrothermal Carbonization as a Strategy for Sewage Sludge Management: Influence of Process Withdrawal Point on Hydrochar Properties

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Hydrothermal Carbonization as a Strategy for Sewage Sludge Management: Influence of Process Withdrawal Point on Hydrochar Properties

Content Provider	MDPI
Author	Merzari, Fabio Goldfarb, Jillian Andreottola, Gianni Mimmo, Tanja Volpe, Maurizio Fiori, Luca
Copyright Year	2020
Description	Conventional activated sludge systems, still widely used to treat wastewater, produce large amounts of solid waste that is commonly landfilled or incinerated. This study addresses the potential use of Hydrothermal Carbonization (HTC) to valorize sewage sludge residues examining the properties of hydrochars depending on HTC process conditions and sewage sludge withdrawal point. With increasing HTC severity (process residence time and temperature), solid yield, total Chemical Oxygen Demand (COD) and solid pH decrease while ash content increases. Hydrochars produced from primary (thickened) and secondary (digested and dewatered) sludge show peculiar distinct properties. Hydrochars produced from thickened sludge show good fuel properties in terms of Higher Heating Value (HHV) and reduced ash content. However, relatively high volatile matter and O:C and H:C ratios result in thermal reactivity significantly higher than typical coals. Both series of carbonized secondary sludges show neutral pH, low COD, enhanced phosphorous content and low heavy metals concentration: as a whole, they show properties compatible with their use as soil amendments.
Starting Page	2890
e-ISSN	19961073
DOI	10.3390/en13112890
Journal	Energies
Issue Number	11
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2020-06-05
Access Restriction	Open
Subject Keyword	Energies Paper and Wood Sewage Sludge Hydrothermal Carbonization Hydrochar Solid Biofuel Soil Amendment
Content Type	Text
Resource Type	Article

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