Self-fluidized GAC-amended UASB reactor for enhanced methane production
作者： Najiaowa Yu , Bing Guo , Yingdi Zhang , Lei Zhang , Yun Zhou
DOI: 10.1016/J.CEJ.2020.127652
关键词:
摘要: Abstract Granular activated carbon (GAC) has been reported to benefit anaerobic digestion systems by stimulating direct interspecies electron transfer (DIET) as an alternative hydrogen (IHT). Conventional up-flow sludge blanket (UASB) reactors typically have GAC settled at the bottom of reactor, limiting contact between biomass and GAC. This study demonstrated a modified UASB reactor that fluidizes encaging in plastic carriers. Enhanced performance was achieved with respect methane production COD removal organic loading rate 1500 g COD/m3/d under temperature 20 °C using self-fluidized configuration; methanation increased from 0.33 ± 0.08 g CH4-COD/g influent non-GAC 0.66 ± 0.02 g GAC-only further 0.77 ± 0.02 g reactor. The concentrations medium-chain acyl-homoserine lactones GAC-amended reactors, potentially associated promotion syntrophic interactions bacteria archaea. Batch tests were performed for propionate degradation hydrogen-inhibition conditions, showed microbial consortium enriched both amended can overcome inhibition. Further community analysis unveiled variation spatial distribution (including DIET indicator microorganisms such Geobacter Methanosarcina) based on location reactors. improved amendment strategy facilitate biomethane recovery wastewater digestion.
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