Performance of a Novel Downward Plug-Flow Anaerobic Digester for Methane Production from Chopped Straw
In China, there is an urgent need for an efficient anaerobic digester to sustainably treat rice straw. In this study, a downward plug-flow anaerobic digester (DPAD) was designed in which the total working core is separated into three sections: an upper liquid zone, a lower liquid zone, and a solid-s...
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North Carolina State University
2014-12-01
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| Series: | BioResources |
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| Online Access: | http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_10_1_943_Luo_Novel_Downward_Anaerobic_Digester |
| _version_ | 1818191850739073024 |
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| author | Tao Luo Yan Long Jang Li Xi Meng Enshen Long Benlin Dai |
| author_facet | Tao Luo Yan Long Jang Li Xi Meng Enshen Long Benlin Dai |
| author_sort | Tao Luo |
| collection | DOAJ |
| description | In China, there is an urgent need for an efficient anaerobic digester to sustainably treat rice straw. In this study, a downward plug-flow anaerobic digester (DPAD) was designed in which the total working core is separated into three sections: an upper liquid zone, a lower liquid zone, and a solid-state bed (SSB) in the middle. A solid/liquid separation mechanism was designed to recirculate liquor and the discharged solid residue after complete digestion. The 70-L DPAD was run indoors for 100 d, time in which chopped rice straw (30 to 50 mm in length) was fed every 20 d. The digestion performance and biogas production were analysed to assess the feasibility for practice application. The results showed that the DPAD can control scum formation and offers a methane yield of 162.60 L/kg volatile solids, 21.1% higher than that of the control test. It was also found that straw was continuously and efficiently digested by the DPAD in 3 experimental stages. Methane production rates increased by 76.30%, 57.37%, and 13.33% on the second day compared to the first day, respectively, and then, all decreased as the substrate was gradually exhausted. Based on the results, it is clear that the DPAD is a promising solution for chopped straw digestion. |
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| id | doaj.art-e203acbec8114ccf8edaea57530e1e87 |
| institution | Directory Open Access Journal |
| issn | 1930-2126 1930-2126 |
| language | English |
| last_indexed | 2024-12-12T00:21:10Z |
| publishDate | 2014-12-01 |
| publisher | North Carolina State University |
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| spelling | doaj.art-e203acbec8114ccf8edaea57530e1e872022-12-22T00:44:43ZengNorth Carolina State UniversityBioResources1930-21261930-21262014-12-0110194395510.15376/biores.10.1.943-955Performance of a Novel Downward Plug-Flow Anaerobic Digester for Methane Production from Chopped StrawTao Luo0Yan Long1Jang Li2Xi Meng3Enshen Long4Benlin Dai5Sichuan University, Chengdu, P. R. China; ChinaBiogas Institute of Ministry of Agriculture, Chengdu 610041, P. R. China; ChinaBiogas Institute of Ministry of Agriculture, Chengdu 610041, P. R. China; ChinaCollege of Architecture and Environment, Sichuan University, Chengdu 610065, P. R. China; ChinaCollege of Architecture and Environment, Sichuan University, Chengdu 610065, P. R. China; China Jiangsu Key Laboratory for Biomass-based Energy and Enzyme Technology, Huaiyin Normal University, Huaian, 223300, P. R. China; ChinaIn China, there is an urgent need for an efficient anaerobic digester to sustainably treat rice straw. In this study, a downward plug-flow anaerobic digester (DPAD) was designed in which the total working core is separated into three sections: an upper liquid zone, a lower liquid zone, and a solid-state bed (SSB) in the middle. A solid/liquid separation mechanism was designed to recirculate liquor and the discharged solid residue after complete digestion. The 70-L DPAD was run indoors for 100 d, time in which chopped rice straw (30 to 50 mm in length) was fed every 20 d. The digestion performance and biogas production were analysed to assess the feasibility for practice application. The results showed that the DPAD can control scum formation and offers a methane yield of 162.60 L/kg volatile solids, 21.1% higher than that of the control test. It was also found that straw was continuously and efficiently digested by the DPAD in 3 experimental stages. Methane production rates increased by 76.30%, 57.37%, and 13.33% on the second day compared to the first day, respectively, and then, all decreased as the substrate was gradually exhausted. Based on the results, it is clear that the DPAD is a promising solution for chopped straw digestion.http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_10_1_943_Luo_Novel_Downward_Anaerobic_DigesterDownward plug-flow digesterMethaneAnaerobic digestionRice strawSolid/LiquidSeparation |
| spellingShingle | Tao Luo Yan Long Jang Li Xi Meng Enshen Long Benlin Dai Performance of a Novel Downward Plug-Flow Anaerobic Digester for Methane Production from Chopped Straw BioResources Downward plug-flow digester Methane Anaerobic digestion Rice straw Solid/Liquid Separation |
| title | Performance of a Novel Downward Plug-Flow Anaerobic Digester for Methane Production from Chopped Straw |
| title_full | Performance of a Novel Downward Plug-Flow Anaerobic Digester for Methane Production from Chopped Straw |
| title_fullStr | Performance of a Novel Downward Plug-Flow Anaerobic Digester for Methane Production from Chopped Straw |
| title_full_unstemmed | Performance of a Novel Downward Plug-Flow Anaerobic Digester for Methane Production from Chopped Straw |
| title_short | Performance of a Novel Downward Plug-Flow Anaerobic Digester for Methane Production from Chopped Straw |
| title_sort | performance of a novel downward plug flow anaerobic digester for methane production from chopped straw |
| topic | Downward plug-flow digester Methane Anaerobic digestion Rice straw Solid/Liquid Separation |
| url | http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_10_1_943_Luo_Novel_Downward_Anaerobic_Digester |
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