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| Advances in ventilation systems and parameter choices during aerobic composting |
| Received:July 10, 2018 Revised:September 18, 2018 |
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| KeyWord:aerobic composting;ventilation;process parameters;research progress |
| Author Name | Affiliation | E-mail | | XU Peng-xiang | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | WANG Yue | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | YANG Jun-xiang | National Animal Husbandry Station of China, Beijing 100022, China | 18611952670@163.com | | LI Ji | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | |
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| Abstract: |
| Ventilation is an important parameter that affects the temperature change, microbial activity, gas composition, water removal, and product quality of aerobic composting. This article reviews current research into ventilation systems and parameter choices during aerobic composting. Aerobic composting has three ventilation modes:natural, passive, and forced ventilation. Forced ventilation is widely used both in composting research and composting engineering. There are three typical ventilation control methods used in aerobic composting:OUR (oxygen uptake rate)maximization control, cyclic control, and oxygen feedback control, where the latter two are considered the standard control methods in industrial composting. OUR maximization control is a new control method exhibiting good control effects, but it has not been applied in practical composting engineering. The ventilation rate of composting is different with raw materials. The results indicate good performance under a ventilation rate of 0.2~0.6 L·min-1·kg-1 of organic matter in composting plants. A combination of pile turning and natural ventilation is typically used in the windrow composting system, sectional forced ventilation technology is typically used in the bed composting system, and intermittent ventilation technology is typically used in the reactor composting system. The stirring parameters should be once per day in windrow and bed systems, and the ventilation parameters should be 0.05~0.2 m3·min-1·m-3 of organic matter in bed and reactor systems. |
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