Effect of temperature and temperature fluctuation on thermophilic anaerobic digestion of cattle manure
Effect of temperature and temperature fluctuation on thermophilic anaerobic digestion of cattle manure
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DOI：
10.1016/j.biortech.2003.07.013
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发表时间：
2004-11-01
影响因子：
11.4
通讯作者：
Lettinga, G
中科院分区：
文献类型：
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作者：
El-Mashad, HM;Zeeman, G;Lettinga, G
在完全搅拌釜反应器 (CSTR) 中研究了温度 50 和 60 摄氏度、水力停留时间 (HRT) 为 20 和 10 天时对牛粪厌氧消化性能的影响。此外，还研究了每日下降和每日上升温度波动的影响。在每日向下温度波动方案中，每个反应器的温度降低10℃，持续10小时，而在每日向上波动方案中，每个反应器的温度升高10℃，持续5小时。结果表明，除了在 10 天的 HRT 下施加向下的温度波动外，在所有施加 HRT 的实验条件下，60 ℃ 时的甲烷产率均低于 50 ℃ 时的甲烷产率。研究还发现，游离氨浓度不仅影响乙酸利用细菌，而且影响水解和酸化过程。与强加的向下温度波动相比，向上的温度波动对最大比产甲烷活性的影响更为严重。结果清楚地表明，可以在白天使用可用的太阳能来加热反应器，而无需在夜间蓄热，特别是在 50 摄氏度的操作温度和 20 天的 HRT 下，并且不会出现过热的危险。 (C) 2004 Elsevier Ltd. 保留所有权利。
The influence of temperature, 50 and 60 degreesC, at hydraulic retention times (HRTs) of 20 and 10 days, on the performance of anaerobic digestion of cow manure has been investigated in completely stirred tank reactors (CSTRs). Furthermore, the effect of both daily downward and daily upward temperature fluctuations has been studied. In the daily downward temperature fluctuation regime the temperatures of each reactor was reduced by 10 degreesC for 10 h while in the daily upward fluctuation regime the temperature of each reactor was increased 10 degreesC for 5 h. The results show that the methane production rate at 60 degreesC is lower than that at 50 degreesC at all experimental conditions of imposed HRT except when downward temperature fluctuations were applied at an HRT of 10 days. It also was found that the free ammonia concentration not only affects the acetate-utilising bacteria but also the hydrolysis and acidification process. The upward temperature fluctuation affects the maximum specific methanogenesis activity more severely as compared to imposed downward temperature fluctuations. The results clearly reveal the possibility of using available solar energy at daytime to heat up the reactor(s) without the need of heat storage during nights, especially at an operational temperature of 50 degreesC and at a 20 days HRT, and without the jeopardising of the overheating. (C) 2004 Elsevier Ltd. All rights reserved.