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《Research of Environmental Sciences》 1992-01
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The Selection of the Temperature and the Corresponding Heat Balance of an Anaerobic Fermentation System

Zhou Xiaojian(Environmental Protection Institute of the Ministry of Light Industry, Beijing, 100037)  
This paper has analysed the relationship between the selection of the temperature and the corresponding heat balance of an anaerobic fermentation system. According to the relationship obtained, the heat balances in the treatment of the filtered water of sweet potato alcohol stillage by thermophilic and mesophilic fermentation systems operated in the area where the lowest temperature in winter is 0℃ and the highest temperature in summer is 35℃ have been discussed respectively. The mesophilic anaerobic process is proved to be more economical than the thermophilic process in treating the liquor with the temperature of 50℃ and the COD concentration of 23g/L. However, some of the biogas produced from the system has to be used as an energy source to heat or cool the influent. The amount of heat required , Qt, depends on the environmental temperature as follows:Qt=4. 73×105to-3.73×106 (kJ/d)
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