NDLI: Industrial-Scale Hydrothermal Carbonization of Agro-Industrial Digested Sludge: Filterability Enhancement and Phosphorus Recovery

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Industrial-Scale Hydrothermal Carbonization of Agro-Industrial Digested Sludge: Filterability Enhancement and Phosphorus Recovery

Content Provider	MDPI
Author	Lucian, Michela Merzari, Fabio Gubert, Michele Messineo, Antonio Volpe, Maurizio
Copyright Year	2021
Description	Hydrothermal carbonization (HTC) provides an attractive alternative method for the treatment of high-moisture waste and, in particular, digested sludge. HTC could reduce the costs and environmental risks associated with sludge handling and management. Although it is recognized that the dewaterability of hydrochars produced from digested sludge, even at mild temperatures (180–190 °C), is highly improved with respect to the starting material, the filterability of HTC slurries for the recovery of the solid material (hydrochar) still represents a challenge. This study presents the results of an investigation into the filterability of agro-industrial digested sludge HTC slurries produced by a C-700 $Carborem^{TM}$ HTC industrial-scale plant. The filterability of HTC slurries, produced at 190 °C for 1 h, with the use of acid solutions of hydrochloric acid, sulfuric acid or citric acids, was investigated by using a semi-industrial filter press. The use of sulfuric acid or citric acid solutions, in particular, significantly improved the filterability of HTC slurries, reducing the time of filtration and residual moisture content. The acid treatment also promoted the migration of heavy metals and phosphorus (P) in the HTC filtrate solution. This study demonstrates that P can be recovered via the precipitation of struvite in high yields, recovering up to 85 wt% by mass of its initial P content.
Starting Page	9343
e-ISSN	20711050
DOI	10.3390/su13169343
Journal	Sustainability
Issue Number	16
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2021-08-20
Access Restriction	Open
Subject Keyword	Sustainability Environmental Engineering Hydrothermal Carbonization Digested Sludge Citric Acid Hydrochar Filterability Phosphorus Recovery Struvite Heavy Metals Removal Dewaterability
Content Type	Text
Resource Type	Article

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