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浙江大学学报（农业与生命科学版）
Journal of Zhejiang University (Agriculture and Life Sciences)  2021, Vol. 47 Issue (6): 787-796    DOI: 10.3785/j.issn.1008-9209.2020.10.301
Resource utilization & environmental protection     
Characterization of the influence of composting reactors with different operation strategies on internal temperature fields
Hao TAN(),Chen CHEN,Wenxiang LI,Foqin SUN,Dongsheng SHEN,Yuyang LONG()
Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
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Abstract  

Three types of compositing reactors, namely A with bottom aeration, B with central aeration, and C with surrounding aeration, were designed. The effects of ambient temperatures, aeration rates, aeration positions and stirring operations on the temperature fields distributing inside the composting reactors were investigated under no-load condition, and verified by loading test with loading simulated materials. The results showed that the tested four conditions had significant impacts on the internal temperature field distribution, especially the change of the ambient temperature increased the temperature discrepancy inside the reactors. When the aeration rate was 0.75 m3/h, the internal temperature fields of the three tested reactors were evenly distributed, but the temperature field in the reactor C was the best. Overall, the aeration rate of 0.75 m3/h and the surrounding aeration were more favorable aeration strategies for the temperature field distribution. This research aims to obtain better operating parameters of the composting reactor through optimization, and provides a key basis for the treatment of organic solid waste.

Key words： composting reactor      temperature field      simulation      organic solid waste     
Received: 30 October 2020      Published: 25 December 2021
CLC:  X 705  
Corresponding Authors: Yuyang LONG     E-mail: z18405816045@163.com;longyy@zjgsu.edu.cn
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Hao TAN
Chen CHEN
Wenxiang LI
Foqin SUN
Dongsheng SHEN
Yuyang LONG
Cite this article:

Hao TAN,Chen CHEN,Wenxiang LI,Foqin SUN,Dongsheng SHEN,Yuyang LONG. Characterization of the influence of composting reactors with different operation strategies on internal temperature fields. Journal of Zhejiang University (Agriculture and Life Sciences), 2021, 47(6): 787-796.

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http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2020.10.301     OR     http://www.zjujournals.com/agr/Y2021/V47/I6/787


堆肥反应器运行方式对内部温度场影响的表征

本研究针对曝气方式各异的A（底部曝气）、B（中心曝气）、C（四周曝气）3套堆肥反应器，在空载状态下考察了外环境温度、曝气速率、曝气部位和搅拌操作对堆肥反应器内部温度场分布的影响，并通过负载模拟物料试验进行验证。结果表明：供试的4种条件均会对内部温度场分布产生明显影响，尤其是外环境温度的变化会加大反应器内温度差。当曝气速率为0.75 m3/h时，供试的3套反应器内部温度场分布较均匀，但C反应器温度场优于A和B反应器。综合来看，0.75 m3/h的曝气速率、四周曝气是较利于温度场分布的曝气策略。本研究通过优化获取了堆肥反应器较优的运行参数，为有机固体废弃物处理提供了科学依据。


关键词： 堆肥反应器,  温度场,  模拟,  有机固体废弃物 
Fig. 1 Schematic diagram of composting reactors1: Motor; 2: Sampling and injection ports; 3: Seal cover; 4: Water outlet; 5: Temperature detection hole; 6: Water bath layer; 7: Oxygen detection hole; 8: Aeration tube; 9: Leachate collection device; 10: Leachate discharge outlet; 11: Universal wheel; 12: Aeration pump; 13: Inlet pipe; 14: Hot water pump; 15: Outlet pipe; 16: Temperature probe; 17: Water tank; 18: Heating rod; 19: Central control unit; 20: Aeration hole; 21: Gas flow meter; 22: Water inlet; 23: Agitating vane; 24: Exhaust port.
Fig. 2 Influence of the ambient temperature on the longitudinal temperature field inside the composting reactorsA, B, and C represent the reactor names; 30, 40, 50, and 60 represent the ambient temperature values, ℃.
Fig. 3 Influence of the ambient temperature on the profile temperature field inside the composting reactors
Fig. 4 Influence of the aeration rate on the longitudinal temperature field inside the composting reactors
Fig. 5 Influence of the aeration rate on the profile temperature field inside the composting reactorsPlease see the footnote of Fig. 4 for the details of each symbol.
Fig. 6 Influence of stirring on the longitudinal temperature field inside the composting reactorsPlease see the footnote of Fig. 2 for the details of A, B, and C.
Fig. 7 Influence of stirring on the profile temperature field inside the composting reactorsPlease see the footnote of Fig. 2 for the details of A, B, and C.
Fig. 8 Internal longitudinal temperature field of the composting reactors under loading simulated materialsA, B, and C represent the reactor names; 60, 0.25, 0.50, 0.75, 1.00, and S represent 60 ℃, 0.25 m3/h, 0.50 m3/h, 0.75 m3/h, 1.00 m3/h and stirring, respectively.
Fig. 9 Internal profile temperature field of the composting reactors under loading simulated materialsPlease see the footnote of Fig. 8 for the details of each symbol.
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