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Xu Lijuan, Zhu Guangcan, Lü Xiwu, Zhao Jinwei. Biogas production through anaerobic digestion from the mixture of decomposed cyanobacteria and anaerobic sludge[J]. Chinese Journal of Environmental Engineering, 2013, 7(9): 3345-3350.
Citation: Xu Lijuan, Zhu Guangcan, Lü Xiwu, Zhao Jinwei. Biogas production through anaerobic digestion from the mixture of decomposed cyanobacteria and anaerobic sludge[J]. Chinese Journal of Environmental Engineering, 2013, 7(9): 3345-3350.
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Biogas production through anaerobic digestion from the mixture of decomposed cyanobacteria and anaerobic sludge

  • 1.

    College of Energy and Environment, Southeast University, Nanjing 210096, China

  • 2.

    Wuxi Engineering Research Center of Taihu Lake Water Environment, Southeast University, Wuxi 214135, China

  • Received Date: 10/08/2012
    Accepted Date: 09/05/2012
    Available Online: 15/09/2013
    Fund Project:
  • Bench-scale test of small batches was employed to study anaerobic fermentation's yielding biogas with cyanobacteria of different decomposed degrees. The results show that, after 7 days' decomposition at 30~35℃, fresh cyanobacteria can achieve the highest biogas yielding velocity and 246 mL/g COD of biogas yield at 35℃ of anaerobic temperature, with a biogas yielding potential of 354 mL/g (VS). After 15 d of anaerobic reaction, cumulative biogas, COD and VFA concentration tend to be stable. The activity of amylase and dehydrogenase is inhibited at the early stage of anaerobic reaction, while the activity of protease and the concentration of coenzyme F420 increase gradually, reaching 27.66 μmol/(g VS·min) on the 6th day and 0.62 μmol/g(VS) on the 15th day, separately. 15 to 18 day is a time for medium temperature being favorable to decomposed cyanobacteria's anaerobic fermentation, which is less than that of anaerobic digestion with fresh cyanobacteria as stroma. The process of cyanobacteria decomposition promotes anaerobic reaction, and the anaerobic system of cyanobacteria after 7 days' decomposition is provided with greater microbial activity and methane potential.
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Biogas production through anaerobic digestion from the mixture of decomposed cyanobacteria and anaerobic sludge

  • Received Date: 10/08/2012
  • Accepted Date: 09/05/2012
  • Available Online: 15/09/2013
Fund Project:

Abstract: Bench-scale test of small batches was employed to study anaerobic fermentation's yielding biogas with cyanobacteria of different decomposed degrees. The results show that, after 7 days' decomposition at 30~35℃, fresh cyanobacteria can achieve the highest biogas yielding velocity and 246 mL/g COD of biogas yield at 35℃ of anaerobic temperature, with a biogas yielding potential of 354 mL/g (VS). After 15 d of anaerobic reaction, cumulative biogas, COD and VFA concentration tend to be stable. The activity of amylase and dehydrogenase is inhibited at the early stage of anaerobic reaction, while the activity of protease and the concentration of coenzyme F420 increase gradually, reaching 27.66 μmol/(g VS·min) on the 6th day and 0.62 μmol/g(VS) on the 15th day, separately. 15 to 18 day is a time for medium temperature being favorable to decomposed cyanobacteria's anaerobic fermentation, which is less than that of anaerobic digestion with fresh cyanobacteria as stroma. The process of cyanobacteria decomposition promotes anaerobic reaction, and the anaerobic system of cyanobacteria after 7 days' decomposition is provided with greater microbial activity and methane potential.

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