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Biodegradation of microcystins during gravity-driven membrane (GDM) ultrafiltration
Esther Kohler1, Jörg Villiger1, Thomas Posch1
1Limnological Station, Institute of Plant Biology, University of Zurich, Kilchberg, Switzerland.
Plos One
|November 5, 2014
Summary
Gravity-driven membrane ultrafiltration effectively removes microcystins from water, despite reduced flux from cyanobacteria. Biofilms on filters degrade toxins, making water safer for consumption.
Area of Science:
- Environmental science
- Microbiology
- Water treatment
Background:
- Gravity-driven membrane (GDM) ultrafiltration offers low-maintenance water purification, particularly in areas with limited infrastructure.
- Harmful cyanobacterial blooms produce microcystins (MCs), posing significant risks to drinking water quality.
Purpose of the Study:
- To evaluate GDM system performance during simulated cyanobacterial blooms and microcystin release.
- To assess the efficacy of GDM biofilms in degrading microcystins.
Main Methods:
- A GDM ultrafiltration system was operated for 21 days with artificial Microcystis aeruginosa blooms.
- Permeate flux and microcystin concentrations were monitored.
- Bacterial biofilm composition on filter membranes was analyzed.
Main Results:
- Cyanobacterial presence significantly reduced permeate flux.
- Microbial biofilms reduced microcystin levels below the 1 µg L(-1) threshold in 75% of replicates after 15 days.
- Biofilms showed enrichment of bacterial genera potentially involved in microcystin degradation.
Conclusions:
- GDM systems can mitigate microcystin contamination in drinking water, even with cyanobacterial blooms.
- Biofilm communities play a crucial role in degrading microcystins, enhancing water safety.
- Further research into specific bacterial clades involved in microcystin degradation is warranted.
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