Characteristics of Anaerobic Fermentation with Different Parts of Corn Stalks at Low Concentrations |
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Authors: | Xinfeng Wang Chao He Gang Li Panpan Li Quanguo Zhang Baoming Li |
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Institution: | 1. Key Laboratory of New Materials and Facilities for Rural Renewable Energy, Ministry of Agriculture, Collaborative Innovation Center of Biomass Energy, Henan Province, College of Mechanical &2. Electrical Engineering, Henan Agricultural University, Zhengzhou, China;3. Department of Agricultural Structure and Bio-environmental Engineering, College of Water Conservancy &4. Civil Engineering, China Agricultural University, Beijing, China;5. Department of Agricultural Structure and Bio-environmental Engineering, College of Water Conservancy & |
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Abstract: | In order to obtain the characteristics of anaerobic fermentation with different parts of corn stalks at low concentrations, air-dried corn stalks stem bark (SB), stem pith (SP), leaves (L), and corn stalks (CS) were, respectively, mixed with cow dung to perform fermentation at the temperature of 35 oC and carbon-to-nitrogen ratio (C/N) of 25. Mixed with cow dung compost, the fermentation broths were adjusted to a neutral pH value. Along with the enhancing of the total solid (TS) content of SB, SP, L, and CS fermentation broths, both of the daily biogas yields and methane contents increased under the same fermentation condition, except for Sample TS 6% of L. The optimal TS content of SB, SP, L, and CS broth is 8%, 5%, 10%, and 8%, separately. In 35 days, the highest methane yield of SB, SP, L, and CS broth was 125.0 mL/(volatile solid) VS g, 115.3 mL/VS g, 109.7 mL/VS g, and 80.0 mL/VS g, respectively, and the potential of methane transformation production of broth ranks as: SB> L> SP> CS. Daily methane producing rate of SB, SP, and L broth are faster than that of CS. It is necessary to separate the corn stalks into different parts to ferment because the optimal fermentation concentrations for the different parts are different. Additionally, the Gompertz equation was also adopted to simulate the anaerobic digestion process of different materials. The Gompertz equation fitting parameters show that the biodegradation (from easy to difficult) was: L < SP < SB < CS. |
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Keywords: | Anaerobic fermentation Biogas Corn stalks Stem pith Stem bark Leaves |
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