The effect of heat pre-treatment on the anaerobic digestion of high-solid pig manure under high organic loading level
Since more and more large-scale farms appear in China and changes in fecal sewage source disposal, the production of high-concentration solid manure waste is also increasing, and its conversion and utilization are gaining attention. This study investigated the effect of heat pre-treatment (HPT) on t...
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Frontiers Media S.A.
2022-11-01
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| Series: | Frontiers in Bioengineering and Biotechnology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fbioe.2022.972361/full |
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| author | Pengfei Li Pengfei Li Jianlin Wang Hao Peng Qichen Li Ming Wang Ming Wang Wencong Yan Stopira Yannick Benz Boboua Wenzhe Li Yong Sun Yong Sun Guoxiang Zheng Guoxiang Zheng Hongqiong Zhang Hongqiong Zhang |
| author_facet | Pengfei Li Pengfei Li Jianlin Wang Hao Peng Qichen Li Ming Wang Ming Wang Wencong Yan Stopira Yannick Benz Boboua Wenzhe Li Yong Sun Yong Sun Guoxiang Zheng Guoxiang Zheng Hongqiong Zhang Hongqiong Zhang |
| author_sort | Pengfei Li |
| collection | DOAJ |
| description | Since more and more large-scale farms appear in China and changes in fecal sewage source disposal, the production of high-concentration solid manure waste is also increasing, and its conversion and utilization are gaining attention. This study investigated the effect of heat pre-treatment (HPT) on the thermophilic anaerobic digestion (AD) of high-solid manure (HSM). Pig manure (PM) feed with a total solids of 13% was used for the HPT and subsequent anaerobic digestion (AD) test. The HPT was carried out at 60°C, 80°C, and 100°C, respectively, for 15 min after the heating reached the set temperature. The results show that HPT led to PM feed COD solubilization, observing a maximum increase of 24.57% after pretreated at 100°C, and the treated PM feed under this condition received the maximum methane production potential of 264.64 mL·g−1 VS in batch AD test, which was 28.76% higher than that of the untreated group. Another semi-continuous AD test explored the maximum volume biogas production rate (VBPR). It involves two organic loading rates (OLR) of 13.4 and 17.8 g VSadded·L−1·d−1. The continuous test exhibited that all the HPT groups could produce biogas normally when the OLR increased to the high level, while the digester fed with untreated PM showed failure. The maximum VBPR of 4.71 L L−1·d−1 was observed from PM feed after pre-treated at 100°C and running at the high OLR. This reveals that thermal treatment can weaken the impact of a larger volume of feed on the AD system. Energy balance analysis demonstrates that it is necessary to use a heat exchanger to reuse energy in the HPT process to reduce the amount of energy input. In this case, the energy input to energy output (Ei/Eo) ranged from 0.34 to 0.55, which was much less than one, suggesting that biogas increment due to heat treatment can reasonably cover the energy consumption of the pre-treatment itself. Thus combining HPT and high-load anaerobic digestion of PM was suitable. |
| first_indexed | 2024-04-11T08:33:18Z |
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| last_indexed | 2024-04-11T08:33:18Z |
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| spelling | doaj.art-5f2fadf92cdd4abeb858610ca1dd99bd2022-12-22T04:34:24ZengFrontiers Media S.A.Frontiers in Bioengineering and Biotechnology2296-41852022-11-011010.3389/fbioe.2022.972361972361The effect of heat pre-treatment on the anaerobic digestion of high-solid pig manure under high organic loading levelPengfei Li0Pengfei Li1Jianlin Wang2Hao Peng3Qichen Li4Ming Wang5Ming Wang6Wencong Yan7Stopira Yannick Benz Boboua8Wenzhe Li9Yong Sun10Yong Sun11Guoxiang Zheng12Guoxiang Zheng13Hongqiong Zhang14Hongqiong Zhang15College of Engineering, Northeast Agricultural University, Harbin, ChinaKey Laboratory of Combining Farming and Animal Husbandry, Heilongjiang Academy of Black Soil Conservation and Utilization, Ministry of Agriculture, Harbin, ChinaCollege of Engineering, Northeast Agricultural University, Harbin, ChinaCollege of Engineering, Northeast Agricultural University, Harbin, ChinaInstitute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences (CAAS), Beijing, ChinaCollege of Engineering, Northeast Agricultural University, Harbin, ChinaKey Laboratory of Pig-breeding Facilities Engineering, Ministry of Agriculture and Rural Affairs, Harbin, ChinaCollege of Engineering, Northeast Agricultural University, Harbin, ChinaCollege of Engineering, Northeast Agricultural University, Harbin, ChinaHuanghe Science and Technology College, Zhengzhou, ChinaCollege of Engineering, Northeast Agricultural University, Harbin, ChinaKey Laboratory of Pig-breeding Facilities Engineering, Ministry of Agriculture and Rural Affairs, Harbin, ChinaCollege of Engineering, Northeast Agricultural University, Harbin, ChinaKey Laboratory of Pig-breeding Facilities Engineering, Ministry of Agriculture and Rural Affairs, Harbin, ChinaCollege of Engineering, Northeast Agricultural University, Harbin, ChinaKey Laboratory of Pig-breeding Facilities Engineering, Ministry of Agriculture and Rural Affairs, Harbin, ChinaSince more and more large-scale farms appear in China and changes in fecal sewage source disposal, the production of high-concentration solid manure waste is also increasing, and its conversion and utilization are gaining attention. This study investigated the effect of heat pre-treatment (HPT) on the thermophilic anaerobic digestion (AD) of high-solid manure (HSM). Pig manure (PM) feed with a total solids of 13% was used for the HPT and subsequent anaerobic digestion (AD) test. The HPT was carried out at 60°C, 80°C, and 100°C, respectively, for 15 min after the heating reached the set temperature. The results show that HPT led to PM feed COD solubilization, observing a maximum increase of 24.57% after pretreated at 100°C, and the treated PM feed under this condition received the maximum methane production potential of 264.64 mL·g−1 VS in batch AD test, which was 28.76% higher than that of the untreated group. Another semi-continuous AD test explored the maximum volume biogas production rate (VBPR). It involves two organic loading rates (OLR) of 13.4 and 17.8 g VSadded·L−1·d−1. The continuous test exhibited that all the HPT groups could produce biogas normally when the OLR increased to the high level, while the digester fed with untreated PM showed failure. The maximum VBPR of 4.71 L L−1·d−1 was observed from PM feed after pre-treated at 100°C and running at the high OLR. This reveals that thermal treatment can weaken the impact of a larger volume of feed on the AD system. Energy balance analysis demonstrates that it is necessary to use a heat exchanger to reuse energy in the HPT process to reduce the amount of energy input. In this case, the energy input to energy output (Ei/Eo) ranged from 0.34 to 0.55, which was much less than one, suggesting that biogas increment due to heat treatment can reasonably cover the energy consumption of the pre-treatment itself. Thus combining HPT and high-load anaerobic digestion of PM was suitable.https://www.frontiersin.org/articles/10.3389/fbioe.2022.972361/fullheat pretreatmentbiogas productionenergy balanceorganic wastepig manure |
| spellingShingle | Pengfei Li Pengfei Li Jianlin Wang Hao Peng Qichen Li Ming Wang Ming Wang Wencong Yan Stopira Yannick Benz Boboua Wenzhe Li Yong Sun Yong Sun Guoxiang Zheng Guoxiang Zheng Hongqiong Zhang Hongqiong Zhang The effect of heat pre-treatment on the anaerobic digestion of high-solid pig manure under high organic loading level Frontiers in Bioengineering and Biotechnology heat pretreatment biogas production energy balance organic waste pig manure |
| title | The effect of heat pre-treatment on the anaerobic digestion of high-solid pig manure under high organic loading level |
| title_full | The effect of heat pre-treatment on the anaerobic digestion of high-solid pig manure under high organic loading level |
| title_fullStr | The effect of heat pre-treatment on the anaerobic digestion of high-solid pig manure under high organic loading level |
| title_full_unstemmed | The effect of heat pre-treatment on the anaerobic digestion of high-solid pig manure under high organic loading level |
| title_short | The effect of heat pre-treatment on the anaerobic digestion of high-solid pig manure under high organic loading level |
| title_sort | effect of heat pre treatment on the anaerobic digestion of high solid pig manure under high organic loading level |
| topic | heat pretreatment biogas production energy balance organic waste pig manure |
| url | https://www.frontiersin.org/articles/10.3389/fbioe.2022.972361/full |
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