Kinetics Characterization of Anaerobic Digestion of Food Waste and Sludge
Received date: 2016-01-15
Revised date: 2016-02-22
Online published: 2016-02-28
The biogas production kinetics characterization of food waste, sludge and the mixture of food waste and sludge were investigated in mesophilic and thermophilic anaerobic digestion system. The methane potential of food waste were 400 and 426 mLCH4?gVS−1 in mesophilic and thermophilic anaerobic system and then increased to 418 and 513 mLCH4?gVS−1 after oil removing (boiling at 120oC for 20 mins). The maximum of methane production, Rmax obtained from Gompertz model, was increase by 49.8% and 19.0% after oil removing, nevertheless, there were no significant increment of methane production rate of the solid fraction of oil removed food waste. Grinding of food waste partially liquefied food waste. The methane production was faster in mesophilic with constant k of first order kinetics of 0.1955 d−1 than that in thermophilic with a k of 0.1543 d−1. However, the methane production from solid fraction of food waste was faster in thermophilic (k of 0.0804 d−1) than that in mesophilic process (k of 0.0388 d−1), the same results were obtained for solid fraction of oil removed food waste and sludge. The sludge provide a lower gas production potential and lower production rate.
Key words： food waste; sludge; mesophilic fermentation; thermophilic fermentation; kinetics
SU Min, QIAO Wei, ALGAPANI Dalal, WANDERA Simon, GOGLIO Andrea, ADANI Fabrizio, CHEN Li,XIAO Zheng, WEI Quan-yuan, DONG Ren-jie . Kinetics Characterization of Anaerobic Digestion of Food Waste and Sludge[J]. Advances in New and Renewable Energy, 2016 , 4(1) : 1 -9 . DOI: 10.3969/j.issn.2095-560X.2016.01.001
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