Co-digestion of wastewater sludge with food waste and green cuttings : optimization of methane production

Kolbl Repinc, Sabina (author)

This article outlines our investigation into the methane production of wastewater sludge (WWS) from a wastewater treatment plant (WWTP) and a mixture of WWS with food waste (FW) and green cutting (GC). To determine the optimal mixture, two methane potential experiments were performed using the Automatic Methane Potential Test System (AMPTS II). In the first experiment, WWS and FW were used. The highest methane potential was measured in FW, and the lowest in WWS. The combination of both substrates did not approach the methane potential of FW (241.5 ± 15.7 mL CH4/g VS). In second experiment, we combined WWS and GC. The highest methane potential was obtained at 5.1% addition of GC to the WWS (relative to the organic load). This methane potential was 7.5% higher than the methane potential of WWS, which was 470 ± 17 mL CH4/g VS. We calculated the optimal mixture of both experiments using the simplex lattice design method. In experiment one, the model had relatively good fit to the measured values, however in the second experiment the differences were significant

• Language: English
• Keywords: anaerobic digestion, methane potential, wastewater sludge, green cutting, food waste
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: Str. 75-88
• Numbering: Letn. 35, št. 63
• PID: 20.500.12556/RUL-163510
• UDC: 628.336.5:66.098.4(497.4)
• ISSN on article: 0352-3551
• DOI: 10.15292/acta.hydro.2022.06
• COBISS.SI-ID: 152608771
• Publication date in RUL: 08.10.2024

Record is a part of a journal

• Title: Acta hydrotechnica
• Publisher: Fakulteta za gradbeništvo in geodezijo
• ISSN: 0352-3551
• COBISS.SI-ID: 3664386

Licences

• License: CC BY-NC-SA 4.0, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Description: A Creative Commons license that bans commercial use and requires the user to release any modified works under this license.

Secondary language

• Language: Slovenian
• Title: Kodigestija blata iz čistilne naprave z odpadno hrano in zelenim odrezom : optimizacija proizvodnje metana

Abstract

V članku smo raziskovali proizvodnjo metana blata iz čistilne naprave (ČN) in mešanice blata z odpadno hrano in zelenim odrezom. Da bi določili optimalno mešanico, smo izvedli dva eksperimenta metanskih potencialov z uporabo Automatic Methane Potential Test System (AMPTS II). V prvem eksperimentu, kjer smo uporabili blato iz ČN ter odpadno hrano, smo največji metanski potencial izmerili pri odpadni hrani, najmanjšega pa pri blatu iz ČN. Kombinacija obeh substratov metanskega potenciala ni poslabšala, ampak se je približala metanskemu potencialu odpadne hrane (241,5 ± 15,7 mL CH4/g VS). V drugem eksperimentu smo kombinirali blato in zeleni odrez. Največji metanski potencial smo dobili pri 5,1% dodajanju zelenega odreza k blatu (glede na organsko obremenitev). Ta metanski potencial je bil večji za 7,5% od metanskega potenciala blata iz ČN, ki je znašal 470 ± 17 mL CH4/g VS. Z metodo simplex lattice design smo preverili optimalno mešanico obeh eksperimentov. Pri prvem eksperimentu se je model približal izmerjenim vrednostim, pri drugem pa so bile razlike velike.

• Keywords: anaerobna presnova, metanski potencial, blato, zeleni odrez, odpadna hrana