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Anaerobic digestion with corn straw faces the problems of difficult degradation, long fermentation time and acid accumulation in the high concentration of feedstocks. In order to speed up the process of methane production, corn straw treated with sodium hydroxide was used in thermophilic (50 °C) anaerobic digestion, and the effects of biochar addition on the performance of methane production and the microbial community were analyzed. The results showed that the cumulative methane production of all treatment groups reached over 75% of the theoretical methane yield in 7 days and the addition of 4% biochar increased the cumulative methane production by 6.75% compared to the control group. The addition of biochar also decreased the number of biogas and methane production peaks from 2 to 1, and had a positive effect on shortening the digestion start-up period and reducing the fluctuation of biogas production during the digestion process. The addition of 4% biochar increased the abundance of the bacterial family Peptococcaceae throughout the digestion period, promoting the hydrolysis rate of corn straw. The dominant archaeal genus Methanosarcina was significantly more abundant at the peak stage and the end of methane production with 4% biochar added compared to the control group.
Zhi Wang; Ying Guo; Weiwei Wang; Liumeng Chen; Yongming Sun; Tao Xing; Xiaoying Kong. Effect of Biochar Addition on the Microbial Community and Methane Production in the Rapid Degradation Process of Corn Straw. Energies 2021, 14, 2223 .
AMA StyleZhi Wang, Ying Guo, Weiwei Wang, Liumeng Chen, Yongming Sun, Tao Xing, Xiaoying Kong. Effect of Biochar Addition on the Microbial Community and Methane Production in the Rapid Degradation Process of Corn Straw. Energies. 2021; 14 (8):2223.
Chicago/Turabian StyleZhi Wang; Ying Guo; Weiwei Wang; Liumeng Chen; Yongming Sun; Tao Xing; Xiaoying Kong. 2021. "Effect of Biochar Addition on the Microbial Community and Methane Production in the Rapid Degradation Process of Corn Straw." Energies 14, no. 8: 2223.
In this study, microaerobic pretreatment (MP) was used to improve the system stability and biogas production performance of the thermophilic dry anaerobic digestion (AD). The results showed that proper MP made the AD have better methane-producing performance and the maximum cumulative methane production was 108.31 mL/g VS with an oxygen load of 5 mL/g VS, which was 13.20 % higher than that of control group (G1, 95.68 mL/g VS). Specific microaerobic conditions promoted the generation of volatile fatty acid (VFA) and reduced propionic acid content in the digestive system. In addition, the volatile solid (VS) removal rate of the digestive substrates was improved in the presence of limited oxygen, which can reduce environmental risks. Microbial community diversity indicated that MP increased the relative abundance of Firmicutes to promote substrate hydrolysis and accelerated the growth of hydrogenotrophic methanogens to improve AD performance.
Feng Zhen; Xinjian Luo; Tao Xing; Yongming Sun; Xiaoying Kong; Wenzhe Li. Performance evaluation and microbial community analysis of microaerobic pretreatment on thermophilic dry anaerobic digestion. Biochemical Engineering Journal 2020, 167, 107873 .
AMA StyleFeng Zhen, Xinjian Luo, Tao Xing, Yongming Sun, Xiaoying Kong, Wenzhe Li. Performance evaluation and microbial community analysis of microaerobic pretreatment on thermophilic dry anaerobic digestion. Biochemical Engineering Journal. 2020; 167 ():107873.
Chicago/Turabian StyleFeng Zhen; Xinjian Luo; Tao Xing; Yongming Sun; Xiaoying Kong; Wenzhe Li. 2020. "Performance evaluation and microbial community analysis of microaerobic pretreatment on thermophilic dry anaerobic digestion." Biochemical Engineering Journal 167, no. : 107873.
Current vehicle bio-methane plants have drawbacks associated with high energy consumption and low recovery levels of waste heat produced during the gasification process. In this paper, we have optimized the performance of heat exchange networks using pinch analysis and through the introduction of heat pump integration technology. Optimal results for the heat exchange network of a bio-gas system producing 10,000 cubic meters have been calculated using a pinch point temperature of 50 °C, a minimum heating utility load of 234.02 kW and a minimum cooling utility load of 201.25 kW. These optimal parameters are predicted to result in energy savings of 116.08 kW (19.75%), whilst the introduction of new heat pump integration technology would afford further energy savings of 95.55 kW (16.25%). The combined energy saving value of 211.63 kW corresponds to a total energy saving of 36%, with economic analysis revealing that these reforms would give annual savings of 103,300 USD. The installation costs required to introduce these process modifications are predicted to require an initial investment of 423,200 USD, which would take 4.1 years to reach payout time based on predicted annual energy savings.
Feng Zhen; Jia Zhang; Wenzhe Li; Yongming Sun; Xiaoying Kong. Optimizing Waste Heat Utilization in Vehicle Bio-Methane Plants. Energies 2018, 11, 1518 .
AMA StyleFeng Zhen, Jia Zhang, Wenzhe Li, Yongming Sun, Xiaoying Kong. Optimizing Waste Heat Utilization in Vehicle Bio-Methane Plants. Energies. 2018; 11 (6):1518.
Chicago/Turabian StyleFeng Zhen; Jia Zhang; Wenzhe Li; Yongming Sun; Xiaoying Kong. 2018. "Optimizing Waste Heat Utilization in Vehicle Bio-Methane Plants." Energies 11, no. 6: 1518.
Mesophilic and thermophilic anaerobic digestion reactors (MR and TR) for the organic fraction of municipal solid waste (OFMSW) were tested to reveal the differential microbial responses to increasing organic loading rate (OLR). MR exhibited faster adaptation and better performance at an OLR range of 1.0–2.5 g VS·L−1·d−1, with average profiles of a biogas yield of 0.38 L/gVSadded*d at 0.5 g/L*d OLR and 0.69 L/gVSadded*d at 2.5 g/L*d OLR, whereas TR had a biogas yield of 0.07 L/gVSadded*d at 0.5 g/L*d OLR and 0.44 L/gVSadded*d at 2.5 g/L*d OLR. The pyrosequencing results of amplicons revealed the microbial mechanisms of OFMSW anaerobic digestion. Larger shifts in the bacteria composition were observed in the TR with OLR elevation. For methanogens in both reactors, Methanothrix dominated in the MR while Methanosarcina was favored in the TR. Moreover, analysis of the mode and efficiency of metabolism between the MR and TR demonstrated different performances with more efficiency related to the limiting hydrolytic acid step.
Yiming Gao; Xiaoying Kong; Tao Xing; Yongming Sun; Yi Zhang; Xingjian Luo; Yong Sun. Digestion Performance and Microbial Metabolic Mechanism in Thermophilic and Mesophilic Anaerobic Digesters Exposed to Elevated Loadings of Organic Fraction of Municipal Solid Waste. Energies 2018, 11, 952 .
AMA StyleYiming Gao, Xiaoying Kong, Tao Xing, Yongming Sun, Yi Zhang, Xingjian Luo, Yong Sun. Digestion Performance and Microbial Metabolic Mechanism in Thermophilic and Mesophilic Anaerobic Digesters Exposed to Elevated Loadings of Organic Fraction of Municipal Solid Waste. Energies. 2018; 11 (4):952.
Chicago/Turabian StyleYiming Gao; Xiaoying Kong; Tao Xing; Yongming Sun; Yi Zhang; Xingjian Luo; Yong Sun. 2018. "Digestion Performance and Microbial Metabolic Mechanism in Thermophilic and Mesophilic Anaerobic Digesters Exposed to Elevated Loadings of Organic Fraction of Municipal Solid Waste." Energies 11, no. 4: 952.
Carbon-supported Pt–Ru alloys with a Pt/Ru ratio of 1:1 were prepared by NaBH4 reduction at room temperature. X-ray diffraction (XRD) measurements indicate that the as-prepared Pt–Ru nanoparticles had a face-centered cubic (fcc) structure. X-ray photoelectron spectroscopy (XPS) analyses demonstrate that alloying with Ru can decrease the 4f electron density of Pt, which results in a positive binding energy shift of 0.2 eV for the Pt 4f peaks. The catalytic properties of the synthesized Pt–Ru alloy catalysts were compared with those of commercial Pt/C catalysts by linear sweep voltammetry (LSV). The results show that the mass activity of the oxygen reduction reaction (ORR) is enhanced by 2.3 times as much mass activity of Pt relative to the commercial Pt/C catalyst. Single-chambered microbial fuel cell tests also confirm that the Pt–Ru alloys as cathode catalysts have better performance than that of commercial Pt/C catalysts.
Gaixiu Yang; Yongming Sun; Pengmei Lv; Feng Zhen; Xinyue Cao; Xiaojie Chen; Zhongming Wang; Zhenhong Yuan; Xiaoying Kong. Preparation of Pt–Ru/C as an Oxygen-Reduction Electrocatalyst in Microbial Fuel Cells for Wastewater Treatment. Catalysts 2016, 6, 150 .
AMA StyleGaixiu Yang, Yongming Sun, Pengmei Lv, Feng Zhen, Xinyue Cao, Xiaojie Chen, Zhongming Wang, Zhenhong Yuan, Xiaoying Kong. Preparation of Pt–Ru/C as an Oxygen-Reduction Electrocatalyst in Microbial Fuel Cells for Wastewater Treatment. Catalysts. 2016; 6 (10):150.
Chicago/Turabian StyleGaixiu Yang; Yongming Sun; Pengmei Lv; Feng Zhen; Xinyue Cao; Xiaojie Chen; Zhongming Wang; Zhenhong Yuan; Xiaoying Kong. 2016. "Preparation of Pt–Ru/C as an Oxygen-Reduction Electrocatalyst in Microbial Fuel Cells for Wastewater Treatment." Catalysts 6, no. 10: 150.