Improving biomethane yield by controlling fermentation type of acidogenic phase in two-phase anaerobic co-digestion of food waste and rice straw

In this study, the influence of temperature on biogas production efficiency and the microbial community structure was investigated in a two-phase anaerobic digestion reactor for co-digestion of cow manure and corn straw. The results illustrated that the contents of solluted chemical oxygen demand (SCOD) and volatile fatty acid (VFA) in the acidogenic phase and biogas production in the methanogenic phase maintained relatively higher levels at temperatures ranging from 35–25 °C. The methane content of biogas production could be maintained higher than 50% at temperatures above 25 °C. The microbial community structure analysis indicated that the dominant functional bacteria were Acinetobacter, Acetitomaculum, and Bacillus in the acidogenic phase and Cenarchaeum in the methanogenic phase at 35–25 °C. However, the performances of the acidogenic phase and the methanogenic phase could be significantly decreased at a lower temperature of 20 °C, and microbial activity was inhibited obviously. Accordingly, a low temperature was adverse for the performance of the acidogenic and methanogenic phases, while moderate temperatures above 25 °C were more conducive to high biogas production efficiency.

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Effect of liquid digestate recirculation on the ethanol-type two-phase semi-continuous anaerobic digestion system of food waste

Bioresource Technology ◽

10.1016/j.biortech.2020.123534 ◽

2020 ◽

Vol 313 ◽

pp. 123534

Author(s):

Xinxin Ma ◽

Miao Yu ◽

Min Yang ◽

Shuang Zhang ◽

Ming Gao ◽

...

Keyword(s):

Anaerobic Digestion ◽

Food Waste ◽

Two Phase ◽

Liquid Digestate

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Optimizing Acidogenic Process for Achieving High Biomethane Yield from Anaerobic Co-Digestion of Food Waste and Rice Straw Using Response Surface Methodology

Journal of Biobased Materials and Bioenergy ◽

10.1166/jbmb.2014.1461 ◽

2014 ◽

Vol 8 (5) ◽

pp. 512-518 ◽

Cited By ~ 4

Author(s):

Xue Chen ◽

Yunzhi Pang ◽

Dexun Zou ◽

Hairong Yuan ◽

Yanping Liu ◽

...

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Rice Straw ◽

Food Waste

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Optimization of Lactic Acid Production from Food Waste by the Saccharification of Bacillus subtili

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.113-116.1080 ◽

2010 ◽

Vol 113-116 ◽

pp. 1080-1083 ◽

Cited By ~ 1

Author(s):

Ying Ying Liu ◽

Qun Hui Wang ◽

Li Wei Chen ◽

Xiao Qiang Wang ◽

Juan Wang

Keyword(s):

Bacillus Subtilis ◽

Lactic Acid ◽

Acid Concentration ◽

Food Waste ◽

Acid Production ◽

Lactic Acid Production ◽

Total Sugar ◽

Lactic Acid Concentration ◽

Two Phase ◽

Better Than

In order to reduce the costs of production and increase the lactic acid yields, this research adopts Bacillus subtilis to substitute enzymes. The method used in the study is two-phase fermentation - inoculate Bacillus subtilis to food waste to produce sugar, and then inoculate Lactobacillus to food waste to yield lactic acid. 87.22 g l–1 of total sugar can be obtained from non-autoclaved food waste in 30 h of saccharification at 40 centigrade. After two-phase fermentation, the optimal lactic acid concentration was 50.77g/L. The results indicate that two-phase fermentation is better than synchronous saccharification fermentation.

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Two-Phase Mesophilic Anaerobic Co-Digestion of Food Waste and Sewage Sludge: Effect of Hydraulic Retention Time

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.852.789 ◽

2014 ◽

Vol 852 ◽

pp. 789-796 ◽

Cited By ~ 3

Author(s):

Guo Hua Wang ◽

Lei Wang ◽

Xue Jun Tan ◽

Yi Xian Wang ◽

Feng Wang

Keyword(s):

Anaerobic Digestion ◽

Sewage Sludge ◽

Food Waste ◽

Retention Time ◽

Hydraulic Retention Time ◽

Removal Rate ◽

Two Phase ◽

Acidogenic Reactor ◽

In Series ◽

The Impact

The impact of hydraulic retention time (HRT) on two-phase mesophilic (35°C) anaerobic co-digestion of food waste and sewage sludge was studied under mixing ratio of 1:1 on the TS basis. Laboratory-scale, two-phase anaerobic digestion systems were employed with each system consisting of an acidogenic reactor and a methanogenic reactor linked in series. For the acidogenic phase, an increase of volatile fatty acid (VFA) concentration was observed as HRT increased from 1d to 5d and the HRT of 5d was recommended for significantly higher VFA production and less propionate percentage, which could provide stable and favourable substrates for the methane reactor. Under acidogenic HRT of 5d, 20d was proved to be the optimum HRT for methanogenic phase with the methane content, methane production rate, methane yield and two-phase VS removal rate reached 71%, 0.7L/(L·d), 0.69L/gVSremoved and 64.7%, respectively. Results verified that the constraints of conventional anaerobic digestion for food waste or sewage sludge separately could be overcome by synergistic effect of co-digestion strategy and two-phase treatment.

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