Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial Communities
The heat accumulation generated by microbial metabolic activities during the storage of the sawdust may lead to spontaneous combustion accidents. This paper studied the Critical Ambient Temperature (CAT) variation of poplar sawdust at different stack dimensions and investigated the physicochemical p...
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MDPI AG
2022-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/3/1114 |
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| author | Zitao Yuan Wenbin Xu Zili He Hao Shen |
| author_facet | Zitao Yuan Wenbin Xu Zili He Hao Shen |
| author_sort | Zitao Yuan |
| collection | DOAJ |
| description | The heat accumulation generated by microbial metabolic activities during the storage of the sawdust may lead to spontaneous combustion accidents. This paper studied the Critical Ambient Temperature (CAT) variation of poplar sawdust at different stack dimensions and investigated the physicochemical properties as well as microbial community dynamics during the self-heating process of poplar sawdust stacks. From the self-heating substances test experiments and Frank-Kamenetskii (FK) theory, it was found that the CAT of poplar sawdust stacks would decrease from 158.27 °C to 102.46 °C with the increase of stack size from 0.1 m to 3.2 m. From the sawdust stack self-heating experiments, microbial metabolic activities were enhanced with the increasing moisture content (by watering) and oxygen (by turning over), which led to a remarkable increase of the sawdust stack temperature and the rapid decomposition of biochemical components (especially cellulose and hemicellulose). From the microbiological community analysis, at the thermophilic stage (around 60 °C, large amounts of heat release in compost bin), the existence of thermostable bacteria (such as <i>Brevibacillus thermoruber</i>, <i>Bacillus thermoamylovorans</i> and <i>Paenibacillus barengoltzii</i> belonging to <i>Firmicutes</i>) played an important role in degrading organic substances. The heat generated by the microbial metabolic activities might lead to spontaneous combustion eventually if sawdust stack is large enough. Therefore, the sawdust should be stacked in a cool and dry area while avoiding large amounts of storage in high humidity environments. |
| first_indexed | 2024-03-09T23:35:16Z |
| format | Article |
| id | doaj.art-969c9528e3a645fcbc5012a3e3002fd8 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T23:35:16Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-969c9528e3a645fcbc5012a3e3002fd82023-11-23T17:02:31ZengMDPI AGMaterials1996-19442022-01-01153111410.3390/ma15031114Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial CommunitiesZitao Yuan0Wenbin Xu1Zili He2Hao Shen3Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control & Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, ChinaGuangdong Key Laboratory of Environmental Catalysis and Health Risk Control & Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, ChinaGuangdong Key Laboratory of Environmental Catalysis and Health Risk Control & Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, ChinaGuangdong Provincial Key Laboratory of Fire Science and Technology, School of Intelligent Systems Engineering, Sun Yat-sen University, Guangzhou 510006, ChinaThe heat accumulation generated by microbial metabolic activities during the storage of the sawdust may lead to spontaneous combustion accidents. This paper studied the Critical Ambient Temperature (CAT) variation of poplar sawdust at different stack dimensions and investigated the physicochemical properties as well as microbial community dynamics during the self-heating process of poplar sawdust stacks. From the self-heating substances test experiments and Frank-Kamenetskii (FK) theory, it was found that the CAT of poplar sawdust stacks would decrease from 158.27 °C to 102.46 °C with the increase of stack size from 0.1 m to 3.2 m. From the sawdust stack self-heating experiments, microbial metabolic activities were enhanced with the increasing moisture content (by watering) and oxygen (by turning over), which led to a remarkable increase of the sawdust stack temperature and the rapid decomposition of biochemical components (especially cellulose and hemicellulose). From the microbiological community analysis, at the thermophilic stage (around 60 °C, large amounts of heat release in compost bin), the existence of thermostable bacteria (such as <i>Brevibacillus thermoruber</i>, <i>Bacillus thermoamylovorans</i> and <i>Paenibacillus barengoltzii</i> belonging to <i>Firmicutes</i>) played an important role in degrading organic substances. The heat generated by the microbial metabolic activities might lead to spontaneous combustion eventually if sawdust stack is large enough. Therefore, the sawdust should be stacked in a cool and dry area while avoiding large amounts of storage in high humidity environments.https://www.mdpi.com/1996-1944/15/3/1114sawdust stackCritical Ambient Temperature (CAT)self-heating processphysicochemical propertiesmicrobial communities |
| spellingShingle | Zitao Yuan Wenbin Xu Zili He Hao Shen Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial Communities Materials sawdust stack Critical Ambient Temperature (CAT) self-heating process physicochemical properties microbial communities |
| title | Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial Communities |
| title_full | Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial Communities |
| title_fullStr | Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial Communities |
| title_full_unstemmed | Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial Communities |
| title_short | Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial Communities |
| title_sort | poplar sawdust stack self heating properties and variations of internal microbial communities |
| topic | sawdust stack Critical Ambient Temperature (CAT) self-heating process physicochemical properties microbial communities |
| url | https://www.mdpi.com/1996-1944/15/3/1114 |
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