Environmental impact of food waste

Obersteiner, Gudrun; Scherhaufer, Silvia

doi:10.1016/b978-0-12-821363-6.00011-4

Cited by 1 publication

(2 citation statements)

References 28 publications

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“…Table 1 reports the total solid (TS) and phosphorus (P) content of digested sludge (DS) and HTC residues: HTC slurry (SL) and HTC centrifuged hydrochar (SLHC). (1) 76.5 (1) 0.09 −7.7 (2,3) (1). Data expressed in terms of mg/L.…”

Section: Digested Sludge and Htc Slurry Properties And Characteristicsmentioning

confidence: 99%

“…The recent development of the agro-industry to satisfy increased demand for processed food and beverages requires new and sustainable technologies for agro-industrial waste management [1]. During agro-industrial processing-used in, for example, the sugar [2], winery [3] dairy [4] and meat processing [5] industries-large quantities of organic waste such as agro-industrial sludge is produced, which needs to be correctly processed, valorized and/or disposed of.…”

Section: Introductionmentioning

confidence: 99%

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

Lucian¹,

Merzari²,

Gubert³

et al. 2021

Sustainability

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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 CarboremTM 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.

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