Anaerobic Digestion of Napier Grass (Pennisetum purpureum) in Two-Phase Dry Digestion System Versus Wet Digestion System
| Autor: | Amornpan Thaemngoen, Sumate Chaiprapat, Kanyarat Saritpongteeraka, Shao Yuan Leu, Chettaphong Phuttaro, Chayanon Sawatdeenarunat |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
biology Renewable Energy Sustainability and the Environment Chemistry 020209 energy Lignocellulosic biomass 02 engineering and technology biology.organism_classification 01 natural sciences Methane Anaerobic digestion chemistry.chemical_compound Digestion (alchemy) Animal science Methanation 010608 biotechnology 0202 electrical engineering electronic engineering information engineering Leachate Pennisetum purpureum Agronomy and Crop Science Anaerobic exercise Energy (miscellaneous) |
| Zdroj: | BioEnergy Research. 13:853-865 |
| ISSN: | 1939-1242 1939-1234 |
| Popis: | Napier grass (Pennisetum purpureum) is a high yield tropical grass with great potential for anaerobic digestion. Two-phase anaerobic dry digestion (TADD), considered an alternative for anaerobic wet digestion system (AWD) with only front-end leach bed reactor (LBR), is added to existing liquid digester, was tested under different leachate circulations, and was compared with AWD. Leachate circulation frequency in LBR was found to highly influence hydrolysis rate and hence improved overall digestibility of the grass fiber. Additional methane yield of 32.5% was achieved when leachate circulation increased from 1 to 4 times per day and diminished to merely 13.7% more at continuous circulation. A shift in methane generation from leachate digester to LBR as digestion time progressed and important biochemical characteristics were discussed. In AWD, operation at an organic loading of 4 kgVS/m3 d gave the highest methane yield at 145.2 m3/tondry, which is 2.3 times higher than TADD due to an advantage in mass transfer in a total wet environment. This work had advanced our understandings on phase separation in anaerobic digestion system and the key methanation performance among dry and wet digestions of the prototypical lignocellulosic biomass. |
| Databáze: | OpenAIRE |
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