Reactor configuration influences microbial community structure during high-rate, low-temperature anaerobic treatment of dairy wastewater.

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ID: 105076
2020
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Abstract
Low temperature anaerobic digestion remains in its infancy, despite increasing interest for the treatment of complex wastewaters. In this study, the feasibility of low-temperature anaerobic treatment of dairy wastewater was assessed during a 443-day laboratory-scale bioreactor trial. The bioreactors were operated in triplicate at organic loading rates of 7.5-9 kgCODmd throughout five operational phases. The structure of the microbial community was analysed using quantitative real-time PCR and amplicon sequencing of 16S rRNA genes from DNA and rRNA. The results indicated that low-temperature treatment of dairy wastewater is feasible at 15 °C, but that reactor configuration remains extremely important. The upflow anaerobic sludge bed (UASB) configuration out-performed the expanded granular sludge bed (EGSB)-based configurations. Decreased temperatures resulted in significant reductions in microbiome diversity. Methanosaeta was identified as a dominant genus throughout the trial, while Lactococcus was identified as an important bacterial genus at low-temperatures. However, the relative abundance of Lactococcus was significantly influenced by reactor configuration.
Reference Key
mcateer2020reactorbioresource Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors McAteer, Paul G;Christine Trego, Anna;Thorn, Camilla;Mahony, Therese;Abram, Florence;O'Flaherty, Vincent;
Journal Bioresource technology
Year 2020
DOI
S0960-8524(20)30492-2
URL
Keywords
anaerobic digestion dairy wastewater microbiome egsb lactococcus uasb

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