Product yield, quality and energy in the hydrolysis of urban bio-waste compost from laboratory-scale runs
Articolo
Data di Pubblicazione:
2018
Abstract:
The valorisation of bio-waste is pursued to cope with the increasing amount of waste that results from
human food consumption and also to find renewable feedstock for manufacturing fuel and chemicals, as
an alternative to fossils. Bio-waste is currently processed using fermentation and thermo-chemical
technologies, to produce bio-fuel, compost and small platform molecules. Commercial low temperature
chemical processes to valorise the bio-waste lignin fractions as feedstock for value-added chemicals
do not as yet exist. The present work addresses this technology gap showing that the low-temperature
hydrolysis of municipal bio-waste compost is a safe eco-friendly, cost effective process for converting the
lignin-like material from compost into value-added speciality chemicals. It is reported that the process
produces a 30%e70% yield of soluble biopolymers (SBO) as temperature increases from 60 to 150 C. The
SBO at 150 C exhibit the best surfactant properties, making them promising for multipurpose uses in the
future. The reaction yield is limited by non-hydrolysable lignin-like matter present in the pristine
compost. Energy changes occur due to endothermic and exothermic reaction during hydrolysis at
different temperatures. The process allows most of the process water and reagent to be recycled and
saves on reagents, water and processing energy. No secondary treatment of the process effluent is
necessary. The data lead to the conclusion that it will be feasible to produce SBO at commercial level
through low-temperature hydrolysis of compost or biomass from different sources.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Lignin, Compost, Bio-waste, Hydrolysis, Energy consumption, Bio-based products
Elenco autori:
Negre, Michèle; Montoneri, Enzo; Antonini, Massimiliano; Grillo, Giorgio; Tabasso, Silvia; Quagliotto, Pierluigi; Berto, Silvia; Mendichi, Raniero; Cravotto, Giancarlo; Baglieri, Andrea
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