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Anaerobic membrane bioreactor treatment of domestic wastewater at psychrophilic temperatures ranging from 15 °C to 3 °C

Content Provider	Royal Society of Chemistry (RSC)
Author	Smith, A. L. Skerlos, S. J. Raskin, L.
Copyright Year	2015
Abstract	Anaerobic membrane bioreactor (AnMBR) treatment of a simulated domestic wastewater was evaluated at psychrophilic temperatures of 15, 12, 9, 6, and 3 °C. Chemical oxygen demand (COD) removal >95% was achieved at temperatures as low as 6 °C, but fell to 86% at 3 °C. As temperature decreased, soluble COD in the bioreactor increased suggesting a reduction in suspended biomass activity. The high total COD removal was maintained via biological activity in the membrane biofilm, which resulted in significant dissolved methane oversaturation in the permeate. Sequencing of 16S rRNA suggested that the biofilm's metabolic diversity increased as temperature decreased in response to a greater flux of complex organics into the biofilm due to temperature-based suspended biomass inhibition. Hydrogenotrophic methanogenesis as opposed to aceticlastic methanogenesis was the preferred pathway in the biofilm, but not in the suspended biomass. This research demonstrated that AnMBR treatment of domestic wastewater at very low temperatures is feasible. However, it is important to develop technologies for dissolved methane recovery and to consider strategies to improve suspended biomass activity at low temperatures to decrease the reliance on biofilm treatment thereby decreasing dissolved methane oversaturation.
Starting Page	56
Ending Page	64
Page Count	9
File Format	HTM / HTML PDF
ISSN	20531400
Volume Number	1
Issue Number	1
Journal	Environmental Science: Water Research & Technology
DOI	10.1039/c4ew00070f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Membrane bioreactor Wastewater treatment Psychrophile Chemical oxygen demand Bioreactor Biomass Biofilm Methanogen Methanogenesis
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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