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Shubiao Wu

Performance of two-stage vegetable waste anaerobic digestion depending on varying recirculation rates

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  • Zhuang Zuo, China Agricultural University
  • ,
  • Shubiao Wu
  • Wanqin Zhang, China Agricultural University
  • ,
  • Renjie Dong, China Agricultural University

Vegetable waste, which characterized by high moisture content, was evaluated as a substrate for biogas production. The effects of recirculation rate (RR) on the performance of two-stage anaerobic digestion were investigated. The system was operated at an organic loading rate of 1.7. g. VS/L/d with varying RRs (0, 0.6, 1, and 1.4). Results demonstrated that volumetric biogas production rates in acidogenic reactor increased from approximately 0.27. L/L/d to 0.97. L/L/d, when pH is increased from approximately 5.1 to 6.7. These indicate that recirculation of alkaline effluent from the methanogenic reactor helps create a favorable condition for biogas production in the acidogenic reactor. The decrease in chemical oxygen demand (COD) concentrations from approximately 21,000. mg/L to 6800. mg/L was also observed in the acidogenic reactor. This condition may be attributed to dilution under recirculation. The dynamics between hydrolysis and methanogenesis under recirculation indicated that mass transfer capacity between two-stage reactors improved.

TidsskriftBioresource Technology
Sider (fra-til)266-272
Antal sider7
StatusUdgivet - 2014
Eksternt udgivetJa

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