Microwave Pre-Treatment of Model Food Waste to Produce Short Chain Organic Acids and Ethanol via Anaerobic Fermentation
As an alternative to conventional anaerobic digestion for methane production, anaerobic fermentation (AF) of organic matter can produce short chain organic acids (SCOAs) in a sustainable way. This study investigated the effect of microwave (MW) pre-treatment on the AF of model food waste to SCOAs an...
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| Veröffentlicht in: | Processes 2022-06, Vol.10 (6), p.1176 |
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| creator | Simonetti, Serena Fernández Martín, Claudia Dionisi, Davide |
| description | As an alternative to conventional anaerobic digestion for methane production, anaerobic fermentation (AF) of organic matter can produce short chain organic acids (SCOAs) in a sustainable way. This study investigated the effect of microwave (MW) pre-treatment on the AF of model food waste to SCOAs and ethanol. The MW pre-treatment was investigated at three temperatures (120, 150 and 180 °C) and residence times (2, 5 and 8 min). The MW treatment gave a significant reduction in the pH and volatile suspended solids (VSS). The largest reduction in the VSS was 20%, indicating solubilisation of the organic matter. The latter was also confirmed by the increase, although it was not statistically significant, in the soluble chemical oxygen demand (COD) and soluble carbohydrates. In the fermentation batch tests, the total product yield was higher (17.5% COD COD−1) than for the untreated substrate (11.1% COD COD−1). An electricity price of GBP 0.06 kWh−1 would correspond to the market value of the additional SCOAs produced with the pre-treated substrate. Although this price is lower than the current business price of electricity in the UK, the MW pre-treatment could become economically feasible with scale-up effects and by using free excess electricity coming from renewable resources. |
| doi_str_mv | 10.3390/pr10061176 |
| format | Article |
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This study investigated the effect of microwave (MW) pre-treatment on the AF of model food waste to SCOAs and ethanol. The MW pre-treatment was investigated at three temperatures (120, 150 and 180 °C) and residence times (2, 5 and 8 min). The MW treatment gave a significant reduction in the pH and volatile suspended solids (VSS). The largest reduction in the VSS was 20%, indicating solubilisation of the organic matter. The latter was also confirmed by the increase, although it was not statistically significant, in the soluble chemical oxygen demand (COD) and soluble carbohydrates. In the fermentation batch tests, the total product yield was higher (17.5% COD COD−1) than for the untreated substrate (11.1% COD COD−1). An electricity price of GBP 0.06 kWh−1 would correspond to the market value of the additional SCOAs produced with the pre-treated substrate. Although this price is lower than the current business price of electricity in the UK, the MW pre-treatment could become economically feasible with scale-up effects and by using free excess electricity coming from renewable resources.</description><identifier>ISSN: 2227-9717</identifier><identifier>EISSN: 2227-9717</identifier><identifier>DOI: 10.3390/pr10061176</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Acids ; Alternative energy sources ; Anaerobic digestion ; Biogas ; Carbohydrates ; Chains ; Chemical oxygen demand ; Cooling ; Dielectric properties ; Electricity ; Electricity pricing ; Ethanol ; Experiments ; Fermentation ; Food waste ; Heat ; Market value ; Organic acids ; Organic matter ; Pretreatment ; Raw materials ; Reduction ; Renewable resources ; Solid suspensions ; Solubilization ; Statistical analysis ; Substrates ; Sustainable yield</subject><ispartof>Processes, 2022-06, Vol.10 (6), p.1176</ispartof><rights>2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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| subjects | Acids Alternative energy sources Anaerobic digestion Biogas Carbohydrates Chains Chemical oxygen demand Cooling Dielectric properties Electricity Electricity pricing Ethanol Experiments Fermentation Food waste Heat Market value Organic acids Organic matter Pretreatment Raw materials Reduction Renewable resources Solid suspensions Solubilization Statistical analysis Substrates Sustainable yield |
| title | Microwave Pre-Treatment of Model Food Waste to Produce Short Chain Organic Acids and Ethanol via Anaerobic Fermentation |
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