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Comparison Between Single and Two-Stage Anaerobic Digestion of Vegetable Waste: Kinetics of Methanogenesis and Carbon Flow

  • Dinh Pham VanEmail author
  • Fujiwara Takeshi
  • Giang Hoang Minh
  • Song Toan Pham Phu
Original Research
  • 5 Downloads

Abstract

This study aims to compare the performance and kinetics between the single-stage anaerobic digestion (SAD) and the two-stage anaerobic digestion (TAD) of vegetable waste (VW). The SAD was performed using continuously stirred tank reactors. Meanwhile, the TAD experiment was set up using a combined system involving a continuously stirred tank for hydrolysis/acidogenesis and an upflow reactor for methanogenesis. The hydrolytic reactor operated as a batch process with a retention time (RT) of 9 days, while the methane reactor was a continuous process operation with RT of 20 days. Both TAD and SAD were controlled at a temperature of 36 °C. The SAD experiments lasted for 143 days, and were characterised by the kinetic rate constant k = 0.02 day−1 which was much lower than that for the TAD (k = 0.66 − 2.16 day−1). The SAD seemed to be inhibited by high concentration of free ammonia and low inoculum to substrate ratio; herein, only 17.8–22.3% of the initial carbon could be converted into biogas (equivalent to 91–110 Nml/g-VSadded) with low methane content (44.1–48.7%). Meanwhile, TAD converted 41.67% initial carbon to biogas (equivalent to 299.0–374.6 Nml/g-VSadded) with high methane content (71.68–81.0%). Moreover, methanogenesis in the TAD was highly stable which enabled the digestion process to return to normal state within a few days, even though the concentrations of the influent increased to double (6.5–24.5 g-COD/l). As per these results, the TAD was much more stable, faster, and stronger than the SAD.

Graphic Abstract

Keywords

Anaerobic digestion Single-stage digestion Two-stage digestion Vegetable waste 

Notes

Acknowledgements

The authors would like to thank the Okayama University (Japan) and National University of Civil Engineering (vietnam) for their financial support.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Environmental Technology and ManagementNational University of Civil EngineeringHa NoiVietnam
  2. 2.Department of Environmental Science, Graduate School of Environmental and Life ScienceOkayama UniversityOkayamaJapan
  3. 3.The University of Danang - University of Technology and EducationDanang CityVietnam

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