Abstract
Food waste is successfully treated by anaerobic digestion process, where the organic matter is converted into methane. On the other hand, food waste bioprocessing to produce hydrogen has been only recently implemented, wherein a number of expensive pretreatment techniques have been proven. This chapter describes the recent studies on hydrogen and methane production from food waste using a dark fermentation reactor coupled with anaerobic digestion at thermophilic temperature. The use of external chemicals to control the pH was avoided, but sludge recirculation from the methanogenic reactor to the dark fermentation was exploited to maintain the system in an optimal pH range for production of a gas mixture with the typical composition of enriched methane. Ammonia accumulation and variation was observed during 1 year of process monitoring and was finally elaborated with a chemometric analysis tool, giving back useful results to be implemented in an automatic process control based on correlation between ammonia, conductivity and alkalinity.
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Abbreviations
- ATP:
-
Adenosin triphosphate
- COD:
-
Chemical oxygen demand
- CSTR:
-
Continuous stirred tank reactor
- D:
-
Dilution rate
- EM:
-
Enriched methane
- FW:
-
Food waste
- GHG:
-
Greenhouse gas
- GPR:
-
Gas production rate
- HRT:
-
Hydraulic retention time
- LAB:
-
Lactic acid bacteria
- NADH:
-
Nicotinammide adenina dinucleotide
- OFMSW:
-
Organic fraction of municipal solid waste
- OLR:
-
Organic loading rate
- SGP:
-
Specific gas production
- SHP:
-
Specific hydrogen production
- SMP:
-
Specific methane production
- TS:
-
Total solids
- TVS:
-
Total volatile solids
- VFA:
-
Volatile fatty acid
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Acknowledgements
The authors wish to thank the European Union, 7° Framework program 2007–2013, Valorgas Project (ENERGY.2009.3.2.2, Valorization of food waste to biogas), PRIN-MIUR 2007. (Produzione di bio-hythane attraverso processo di digestione anaerobica a due stadi di biomasse primarie (energy crops) e secondarie (rifiuti)), and Industria 2015, (Ministero per lo Sviluppo Economico, “Produzione di energia rinnovabile con impatto minimo da un mix di biomasse e rifiuti speciali non pericolosi attraverso processi innovative”) for the financial support of these studies.
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Cavinato, C., Bolzonella, D., Pavan, P., Cecchi, F. (2016). Two-Phase Anaerobic Digestion of Food Wastes for Hydrogen and Methane Production. In: De Falco, M., Basile, A. (eds) Enriched Methane. Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-22192-2_5
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