Effect of Particle Size on the Aerobic and Anaerobic Digestion Characteristics of Whole Rice Straw
The effect of reducing particle size on physical properties, the methane yield and energy flow were investigated through the biochemical methane potential (BMP) experiment of aerobic-anaerobic digestion (AAD) of rice straw (RS). The whole straw was crushed through four sieves of different aperture s...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-07-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/14/13/3960 |
| _version_ | 1797528096969064448 |
|---|---|
| author | Lina Luo Youpei Qu Weijia Gong Liyuan Qin Wenzhe Li Yong Sun |
| author_facet | Lina Luo Youpei Qu Weijia Gong Liyuan Qin Wenzhe Li Yong Sun |
| author_sort | Lina Luo |
| collection | DOAJ |
| description | The effect of reducing particle size on physical properties, the methane yield and energy flow were investigated through the biochemical methane potential (BMP) experiment of aerobic-anaerobic digestion (AAD) of rice straw (RS). The whole straw was crushed through four sieves of different aperture sizes (1, 3, 5, and 7 mm) to obtain the actual and non-uniform particle size distribution (PSD). The results indicated that the actual particle sizes were normally or logarithmic normally distributed. Reducing particle size could significantly promote the aerobic hydrolysis and acidification process, increase the content of volatile fatty acids (VFAs) from 4408.78 to 6225.15 mg/L and the degradation of volatile solids (VS) from 40.56% to 50.49%. The results of path analysis suggested that particle size reduction played an important role in improving lignocellulosic degradability, which was the main factor affecting methane production with the comprehensive decision of 0.4616. The maximum methane production obtained at 1 mm sieve size was 176.47 mLCH<sub>4</sub>g<sup>−1</sup> VS. The phyla of <i>Firmicutes</i> (61.5%), <i>Proteobacteria</i> (9.3%), <i>Chloroflexi</i> (8.3%), <i>Bacteroidetes</i> (4.1%), <i>Cyanobacteria/Chloroplast</i> (4.6%) were mainly responsible for VFAs production and lignocellulose degradation. However, the net negative energy balance was observed at the 1 mm sieve size due to the increased energy input. Therefore, the optimum sieve size for AAD was 3 mm. |
| first_indexed | 2024-03-10T09:53:16Z |
| format | Article |
| id | doaj.art-dd345b8fd2d748bd96caa5437481146f |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T09:53:16Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-dd345b8fd2d748bd96caa5437481146f2023-11-22T02:37:46ZengMDPI AGEnergies1996-10732021-07-011413396010.3390/en14133960Effect of Particle Size on the Aerobic and Anaerobic Digestion Characteristics of Whole Rice StrawLina Luo0Youpei Qu1Weijia Gong2Liyuan Qin3Wenzhe Li4Yong Sun5Department of New Energy Science and Engineering, School of Engineering, Northeast Agricultural University, No. 600 Changjiang Street, Harbin 150030, ChinaDepartment of New Energy Science and Engineering, School of Engineering, Northeast Agricultural University, No. 600 Changjiang Street, Harbin 150030, ChinaDepartment of New Energy Science and Engineering, School of Engineering, Northeast Agricultural University, No. 600 Changjiang Street, Harbin 150030, ChinaDepartment of New Energy Science and Engineering, School of Engineering, Northeast Agricultural University, No. 600 Changjiang Street, Harbin 150030, ChinaDepartment of New Energy Science and Engineering, School of Engineering, Northeast Agricultural University, No. 600 Changjiang Street, Harbin 150030, ChinaDepartment of New Energy Science and Engineering, School of Engineering, Northeast Agricultural University, No. 600 Changjiang Street, Harbin 150030, ChinaThe effect of reducing particle size on physical properties, the methane yield and energy flow were investigated through the biochemical methane potential (BMP) experiment of aerobic-anaerobic digestion (AAD) of rice straw (RS). The whole straw was crushed through four sieves of different aperture sizes (1, 3, 5, and 7 mm) to obtain the actual and non-uniform particle size distribution (PSD). The results indicated that the actual particle sizes were normally or logarithmic normally distributed. Reducing particle size could significantly promote the aerobic hydrolysis and acidification process, increase the content of volatile fatty acids (VFAs) from 4408.78 to 6225.15 mg/L and the degradation of volatile solids (VS) from 40.56% to 50.49%. The results of path analysis suggested that particle size reduction played an important role in improving lignocellulosic degradability, which was the main factor affecting methane production with the comprehensive decision of 0.4616. The maximum methane production obtained at 1 mm sieve size was 176.47 mLCH<sub>4</sub>g<sup>−1</sup> VS. The phyla of <i>Firmicutes</i> (61.5%), <i>Proteobacteria</i> (9.3%), <i>Chloroflexi</i> (8.3%), <i>Bacteroidetes</i> (4.1%), <i>Cyanobacteria/Chloroplast</i> (4.6%) were mainly responsible for VFAs production and lignocellulose degradation. However, the net negative energy balance was observed at the 1 mm sieve size due to the increased energy input. Therefore, the optimum sieve size for AAD was 3 mm.https://www.mdpi.com/1996-1073/14/13/3960rice strawparticle size reductionaerobic hydrolysis and acidificationmethane productionlignocellulose |
| spellingShingle | Lina Luo Youpei Qu Weijia Gong Liyuan Qin Wenzhe Li Yong Sun Effect of Particle Size on the Aerobic and Anaerobic Digestion Characteristics of Whole Rice Straw Energies rice straw particle size reduction aerobic hydrolysis and acidification methane production lignocellulose |
| title | Effect of Particle Size on the Aerobic and Anaerobic Digestion Characteristics of Whole Rice Straw |
| title_full | Effect of Particle Size on the Aerobic and Anaerobic Digestion Characteristics of Whole Rice Straw |
| title_fullStr | Effect of Particle Size on the Aerobic and Anaerobic Digestion Characteristics of Whole Rice Straw |
| title_full_unstemmed | Effect of Particle Size on the Aerobic and Anaerobic Digestion Characteristics of Whole Rice Straw |
| title_short | Effect of Particle Size on the Aerobic and Anaerobic Digestion Characteristics of Whole Rice Straw |
| title_sort | effect of particle size on the aerobic and anaerobic digestion characteristics of whole rice straw |
| topic | rice straw particle size reduction aerobic hydrolysis and acidification methane production lignocellulose |
| url | https://www.mdpi.com/1996-1073/14/13/3960 |
| work_keys_str_mv | AT linaluo effectofparticlesizeontheaerobicandanaerobicdigestioncharacteristicsofwholericestraw AT youpeiqu effectofparticlesizeontheaerobicandanaerobicdigestioncharacteristicsofwholericestraw AT weijiagong effectofparticlesizeontheaerobicandanaerobicdigestioncharacteristicsofwholericestraw AT liyuanqin effectofparticlesizeontheaerobicandanaerobicdigestioncharacteristicsofwholericestraw AT wenzheli effectofparticlesizeontheaerobicandanaerobicdigestioncharacteristicsofwholericestraw AT yongsun effectofparticlesizeontheaerobicandanaerobicdigestioncharacteristicsofwholericestraw |