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Abstract
Nowadays, fermentation of organic wastes for the production of carboxylic acids as precursors of higher-value products has attracted significant attention. In this paper, sewage sludge and food waste were co-fermented to produce carboxylic acids and study the subsequent chain elongation process. The Copenhagen waste stream scenario was taken as a case study. Firstly, design of experiments was used to investigate the overall carboxylic acids and hexanoic acid production in batch, as a function of the co-fermentation ratio, substrate to co-culture ratio and initial pH. Optimal operating conditions for hexanoic acid were obtained with SS/FW 6.61, S/Xo 6.73 and initial pH 6.83. Statistical optimization increased the overall carboxylic acid titer by 41%, while co-fermentation allowed to increase hexanoate annual production up to 77%. Furthermore, a continuous fermentation experiment was performed to study the effect of reactor operating conditions. The overall carboxylates titer was 2 times higher, which also favored chain elongation compared to batch mode. An increasing loading rate did not affect the overall carboxylate titer, however the hexanoic acid titer increased by 44%. A maximum titer of 4.9 g/l of hexanoic acid was produced, achieving a productivity of 2.46 g/l/d of hexanoic acid with a retention time of 2 d and no external electron donor addition. This would correspond to 610 t/y of hexanoic acid and 350 t/y of other carboxylic acids that could be produced, based on the waste availability in Copenhagen.
Originalsprog | Engelsk |
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Artikelnummer | 126009 |
Tidsskrift | Journal of Cleaner Production |
Vol/bind | 292 |
Antal sider | 10 |
ISSN | 0959-6526 |
DOI | |
Status | Udgivet - jan. 2021 |
Fingeraftryk
Dyk ned i forskningsemnerne om 'Effect of reactor operating conditions on carboxylate production and chain elongation from co-fermented sludge and food waste'. Sammen danner de et unikt fingeraftryk.Projekter
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Wastewater organic waste treatment facilities: net green energy, nutrients and bioproducts producers (COWI FONDEN: PRO-JECT NO: A089475)
01/08/2018 → 31/07/2020
Projekter: Projekt › Forskning