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Microbial stratification and DOM removal in drinking water biofilters: Implications for enhanced performance
Xiang Shi1, Ryan Pereira2, Uzma1
1James Watt School of Engineering, Advanced Research Centre (ARC), University of Glasgow, Chapel Lane, Glasgow G11 6EW, UK.
Water Research
|July 26, 2024
Summary
Microbial communities in drinking water biofilters differ by depth. Deeper communities, though less diverse, remove significantly more dissolved organic carbon, including refractory compounds, offering insights for biofilter optimization.
Area of Science:
- Environmental microbiology
- Water treatment engineering
- Biogeochemistry
Background:
- Biofiltration is a key technology for producing safe drinking water by removing dissolved organic matter (DOM).
- Microbial communities within biofilters are essential for degrading DOM, but their depth-specific roles and interactions with DOM fractions are not fully understood.
- Understanding these microbial dynamics is crucial for optimizing biofilter performance in drinking water treatment.
Purpose of the Study:
- To investigate the relationship between microbial community structure at different biofilter depths and their capacity to utilize various dissolved organic carbon (DOC) fractions.
- To compare the functional roles of microbial communities from the top and bottom sections of a laboratory-scale biofilter.
- To provide insights for enhancing biofilter efficiency through microbial community engineering.
Main Methods:
- Recovery and incubation of microbial communities from the top (0-10 cm) and bottom (20-30 cm) of a biofilter.
- Analysis of microbial diversity using flow cytometry and 16S rRNA amplicon sequencing.
- Characterization of dissolved organic matter (DOM) utilization by microbial communities.
Main Results:
- The bottom microbial community showed lower diversity but a more interconnected network compared to the top community.
- Despite lower initial abundance, the bottom community removed ~60% more total DOC than the top community.
- Both communities degraded labile DOC, but only the bottom community utilized refractory, high-molecular-weight humic substances.
Conclusions:
- Microbial community structure and network complexity are directly correlated with DOM utilization capabilities.
- Deeper biofilter communities possess unique metabolic potential for degrading recalcitrant organic matter.
- Targeted engineering of microbial communities in biofilters can significantly improve the removal of challenging DOM fractions, enhancing drinking water quality.
