Publications

Authors:

Valentino, F.; Moretto, G.; Gottardo, M.; Pavan, P.; Bolzonella, D.; Majone, M.

Title:

Novel routes for urban bio-waste management: A combined acidic fermentation and anaerobic digestion process for platform chemicals and biogas production

Year:

2019

Type of item:

Articolo in Rivista

Tipologia ANVUR:

Articolo su rivista

Language:

Inglese

Format:

A Stampa

Referee:

Sì

Name of journal:

JOURNAL OF CLEANER PRODUCTION

ISSN of journal:

0959-6526

N° Volume:

220

Page numbers:

368-375

Keyword:

anaeobic digestion, biogas, OFMSW, food waste, volatile fatty acids

Short description of contents:

A combined acidic fermentation and anaerobic digestion (AD) treatment has been developed on pilot scale for urban bio-waste conversion into volatile fatty acid (VFA) and biogas. The specific waste mixture was composed by the pre-treated organic fraction of municipal solid waste (OFMSW) and waste activated sludge (WAS), both produced inside the Treviso (northeast Italy) municipality. The effect of temperature (37 °C and 55 °C) was investigated in both steps. Only the mesophilic fermentation process provided a VFA-rich stream (19.5 g COD VFA /L) with stable physical-chemical features, with no need of chemicals addition for pH control. The sludge buffering capacity made this step technically feasible. The AD step was performed on the solid-rich fraction of fermented bio-waste, after dilution with excess WAS. No relevant differences were observed under the two investigated temperature: in the steady state (organic loading rate of 2.5 kg VS/m 3 d), the specific biogas production was 0.40 and 0.45 m 3 /kg VS at 37 °C and 55 °C respectively, with similar CH 4 content (63–64% v/v). The scaled-up version of the system (in an average urban municipality of 170,000 Person Equivalent) revealed that the whole process is thermally sustainable if both reactors are operated at mesophilic temperature: 36% of surplus thermal energy and 13,03 MWh/d of produced electricity, which corresponds to a revenue of 609,605 €/year. In addition, 2,262 kg COD VFA /d are available for parallel purposes, such as the synthesis of bio-products with higher added value than bio-methane (e.g. biopolymers).

Product ID:

108573

Handle IRIS:

11562/995217

Last Modified:

November 15, 2022

Bibliographic citation:

Valentino, F.; Moretto, G.; Gottardo, M.; Pavan, P.; Bolzonella, D.; Majone, M., Novel routes for urban bio-waste management: A combined acidic fermentation and anaerobic digestion process for platform chemicals and biogas production «JOURNAL OF CLEANER PRODUCTION» , vol. 220 , 2019 , pp. 368-375

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