Effect of feed to microbe ratios on anaerobic digestion of Chinese cabbage waste under mesophilic and thermophilic conditions: Biogas potential and kinetic study

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• 作者：Gopi Krishna Kafle ; Sujala Bhattarai ; Sang Hun Kim ; Lide Chen
• 关键词：Anaerobic digestion ; Chinese cabbage waste (CCW) ; Feed to microbe ratio (F/M) ; Kinetic study ; Mesophilic and thermophilic temperature
• 刊名：Journal of Environmental Management
• 出版年：15 January, 2014
• 年：2014
• 卷：133
• 期：Complete
• 页码：293-301
• 全文大小：1123 K

文摘

The objective of this study was to investigate the effect of the feed-to-microbe (F/M) ratios on anaerobic digestion of Chinese cabbage waste (CCW) generated from a kimchi factory. The batch test was conducted for 96 days under mesophilic (36.5聽掳C) (Experiment I) and thermophilic (55聽掳C) conditions (Experiment II) at F/M ratios of 0.5, 1.0 and 2.0. The first-order kinetic model was evaluated for methane yield. The biogas yield in terms of volatile solids (VS) added increased from 591 to 677聽mL/g聽VS under mesophilic conditions and 434 to 639聽mL/g聽VS under thermophilic conditions when the F/M ratio increased from 0.5 to 2.0. Similarly, the volumetric biogas production increased from 1.479 to 6.771聽L/L under mesophilic conditions and from 1.086 to 6.384聽L/L under thermophilic conditions when F/M ratio increased from 0.5 to 2.0. The VS removal increased from 59.4 to 75.6% under mesophilic conditions and from 63.5 to 78.3% under thermophilic conditions when the F/M ratio increased from 0.5 to 2.0. The first-order kinetic constant (k, 1/day) decreased under the mesophilic temperature conditions and increased under thermophilic conditions when the F/M ratio increased from 0.5 to 2.0. The difference between the experimental and predicted methane yield was in the range of 3.4-14.5% under mesophilic conditions and in the range of 1.1-3.0% under thermophilic conditions. The predicted methane yield derived from the first-order kinetic model was in good agreement with the experimental results.