Influence of temperature fluctuation on thermophilic anaerobic digestion of municipal organic solid waste |
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| Authors: | Man-chang Wu Ke-wei Sun Yong Zhang |
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| Institution: | (1) School of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;(2) National Engineering Research Center of Solid Waste Resource Recovery, Kunming, 650033, China |
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| Abstract: | A laboratory-scale experiment was carried out to assess the influence of temperature fluctuation on thermophilic anaerobic
digestion of municipal organic solid waste (MOSW). Heating failure was simulated by decreasing temperature suddenly from 55
°C to 20 °C suddenly; 2 h time is needed for temperature decrease and recovery. Under the conditions of 8.0 g/(L·d) and 15
d respectively for MOSW load and retention time, following results were noted: (1) biogas production almost stopped and VFA
(volatile fatty acid) accumulated rapidly, accompanied by pH decrease; (2) with low temperature (20 °C) duration of 1, 5,
12 and 24 h, it took 3, 11, 56 and 72 h for the thermophilic anaerobic digestion system to reproduce methane after temperature
fluctuation; (3) the longer the low temperature interval lasted, the more the methanogenic bacteria would decay; hydrolysis,
acidification and methanogenesis were all influenced by temperature fluctuation; (4) the thermophilic microorganisms were
highly resilient to temperature fluctuation.
Project (No. 2002-548) supported by the National Development and Reform Commission of China |
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| Keywords: | Temperature fluctuation Low temperature duration Thermophilic anaerobic digestion Municipal organic solid waste |
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