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Effects of increasing organic loading rates on reactor performance and the methanogenic community in a new pilot upflow solid reactor for continuously processing food waste

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  • Li, Demao
  • Tang, Ruohao
  • Yu, Liang
  • Chen, Limei
  • Chen, Shulin
  • Xu, Song
  • Gao, Feng

Abstract

A new pilot upflow solid reactor (USR) for the anaerobic digestion (AD) of food waste was developed and the reactor performance was investigated. The methanogenic microbial community was examined using high-throughput 16S rRNA gene sequencing technology to identify changes in the community in the new reactor with continuous operation at different organic loading rates (OLRs, from 5.2 ± 0.5 to 18.8 ± 0.8 kg COD/(m³·d)) to help understand the reactor performance. A Methanosaeta-dominated methanogenic community was successfully established when the OLR was between 7.0 and 7.6 kg COD/(m³·d). Under these conditions, the average COD removal efficiency was greater than 82% and the average methane yield reached a 280 L/kg CODremoval. When the OLR was greater than 18.8 kg COD/(m³·d), the COD removal efficiency drastically decreased and volatile fatty acids (VFAs) quickly accumulated. The results confirmed that Methanosaeta dominance has a positive effect on reactor performance and methane yield when food waste is treated under an OLR of 7.0 ± 0.7 kg COD/(m³·d). This study demonstrates that the microbial population can be manipulated by changing the reaction conditions and the USR, which has a simple structure and operation, has great potential to handle high-OLR food waste.

Suggested Citation

  • Li, Demao & Tang, Ruohao & Yu, Liang & Chen, Limei & Chen, Shulin & Xu, Song & Gao, Feng, 2020. "Effects of increasing organic loading rates on reactor performance and the methanogenic community in a new pilot upflow solid reactor for continuously processing food waste," Renewable Energy, Elsevier, vol. 153(C), pages 420-429.
  • Handle: RePEc:eee:renene:v:153:y:2020:i:c:p:420-429
    DOI: 10.1016/j.renene.2020.02.020
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