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Anaerobic fermentation of organic municipal solid wastes for the production of soluble organic compounds

Anaerobic fermentation of organic municipal solid wastes for the production of soluble organic compounds
Anaerobic fermentation of organic municipal solid wastes for the production of soluble organic compounds
After investigating the application of the mesophilic and thermophilic processes in completely stirred, batch, and plug-flow reactors, in this study the authors consider the anaerobic fermentation of source-sorted organic municipal solid wastes in psychrophilic conditions (14?22 °C) without pH control. The pilot-scale reactor was operated in a batch mode, with a hydraulic retention time of 4?4.5 d. The production of soluble COD from the particulate matter was (on average) 0.27 gCOD per gram of total volatile solids fed to the reactor when operating with a total solids content of 20?35 g/L. The volatile fatty acids (VFA) were 15% of the soluble COD produced after 4 d of reaction. These values are far lower than those found in mesophilic and thermophilic conditions, where the production of soluble COD ranged from 0.5 up to 0.9 gCOD/gTVSfed and volatile fatty acids could reach 90% of soluble COD. Further, the first-order reaction constant for the hydrolysis process, Kh, for the psychrophilic conditions was found equal to 0.11 d-1 at 20 °C, while it was in the range 0.2?0.4 d-1 when operating in mesophilic or thermophilic conditions. Conclusively, the study of the psychrophilic fermentation process allowed for completing the scenario of different options of anaerobic solid-state fermentation of organic waste. Though mesophilic and thermophilic processes resulted in being more effective in dissolution of particulate matter, psychrophilic processes can be of some interest because they are simpler and energy saving. In particular, psychrophilic processes can be useful for the production of rough soluble COD to be used, e.g., for sustaining the biological nutrients removal processes in wastewater treatment.
0888-5885
3412-3418
Bolzonella, D
554b33d4-ce6f-4d05-93ac-fcc5d49187f3
Pavan, P
751d1ae9-f461-4af4-9781-66c9df174a3d
Fatone, F
2479da5a-25dd-459e-886b-ecbad429002d
Cecchi, F
97cd0131-4631-48fe-8242-c9b9fb04b0ad
Bolzonella, D
554b33d4-ce6f-4d05-93ac-fcc5d49187f3
Pavan, P
751d1ae9-f461-4af4-9781-66c9df174a3d
Fatone, F
2479da5a-25dd-459e-886b-ecbad429002d
Cecchi, F
97cd0131-4631-48fe-8242-c9b9fb04b0ad

Bolzonella, D, Pavan, P, Fatone, F and Cecchi, F (2005) Anaerobic fermentation of organic municipal solid wastes for the production of soluble organic compounds. Industrial & Engineering Chemistry Research, 44 (10), 3412-3418. (doi:10.1021/ie048937m).

Record type: Article

Abstract

After investigating the application of the mesophilic and thermophilic processes in completely stirred, batch, and plug-flow reactors, in this study the authors consider the anaerobic fermentation of source-sorted organic municipal solid wastes in psychrophilic conditions (14?22 °C) without pH control. The pilot-scale reactor was operated in a batch mode, with a hydraulic retention time of 4?4.5 d. The production of soluble COD from the particulate matter was (on average) 0.27 gCOD per gram of total volatile solids fed to the reactor when operating with a total solids content of 20?35 g/L. The volatile fatty acids (VFA) were 15% of the soluble COD produced after 4 d of reaction. These values are far lower than those found in mesophilic and thermophilic conditions, where the production of soluble COD ranged from 0.5 up to 0.9 gCOD/gTVSfed and volatile fatty acids could reach 90% of soluble COD. Further, the first-order reaction constant for the hydrolysis process, Kh, for the psychrophilic conditions was found equal to 0.11 d-1 at 20 °C, while it was in the range 0.2?0.4 d-1 when operating in mesophilic or thermophilic conditions. Conclusively, the study of the psychrophilic fermentation process allowed for completing the scenario of different options of anaerobic solid-state fermentation of organic waste. Though mesophilic and thermophilic processes resulted in being more effective in dissolution of particulate matter, psychrophilic processes can be of some interest because they are simpler and energy saving. In particular, psychrophilic processes can be useful for the production of rough soluble COD to be used, e.g., for sustaining the biological nutrients removal processes in wastewater treatment.

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Published date: 2005

Identifiers

Local EPrints ID: 189047
URI: http://eprints.soton.ac.uk/id/eprint/189047
ISSN: 0888-5885
PURE UUID: 5c54f872-b8b2-4331-bda6-45aa279e935c

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Date deposited: 01 Jun 2011 10:55
Last modified: 16 Jul 2019 23:31

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