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Shubiao Wu

Effects of organic loading rate and effluent recirculation on the performance of two-stage anaerobic digestion of vegetable waste

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

The effects of organic loading rates (OLR) and effluent recirculation on dynamics of acidogenic and methanogenic processes in two-stage anaerobic digestion of vegetable waste were investigated. Two systems were performed at OLRs of 1.3, 1.7, 2.1 and 2.6. g. VS/L/d. One system recirculated the effluent from the methanogenic reactor to acidogenic reactor. With increasing OLRs, total volatile fatty acid (VFA) concentration increased to approximately 8500. mg/L in acidogenic digester, where pH decreased from 6.4 to 5.2. Daily biogas production and methane content in methanogenic reactor increased from 1.2 to 4.4. L/d and from 27.4% to 60.5%, respectively. However, inhibition of hydrolysis in acidogenic reactor was demonstrated under the OLR of 2.6. g. VS/L/d without recirculation, thus indicating system overloading. Effluent recirculation shown a considerable positive effect on alleviating VFA inhibition and improving biogas production in acidogenic reactor because of the effect of dilution and pH adjustment, particularly at high OLRs.

TidsskriftBioresource Technology
Sider (fra-til)556-561
Antal sider6
StatusUdgivet - 2013
Eksternt udgivetJa

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