Degradation of microcystins by adsorbed bacteria on a granular active carbon (GAC) filter during the water treatment process.
The degradation of microcystin by adsorbed bacteria on GAC (granular active carbon) filter from a water treatment facility was investigated. Dominant bacteria isolated from GAC were indigenous microorganisms, Psuedomonas sp. and Flavobacterium sp. The direct exposure of dominant GAC bacteria to microcystins resulted in a significant reduction of microcystin levels in both shaking and static conditions (t-test; p < 0.01). In bacteria-treatments, the half-life of microcystin was 2.6-3.5 days in both conditions. Based on this result, approximately 9-10 days would be estimated for 90% or up to 18-21 days of 99% of toxin to be degraded. This biological degradation by the GAC bacteria in combination with existing purification systems has potential to increase the efficiency of water purification.
Lee
You-Jung
YJ
Busan Water Quality Research Institute, Waterworks HQ, Busan, 617-042, South Korea.
Jung
Jong-Mun
JM
Jang
Min-Ho
MH
Ha
Kyong
K
Joo
Gea-Jae
GJ
D000327:Adsorption; D002244:Carbon; D005374:Filtration / Q000295:instrumentation*; D005417:Flavobacterium / Q000378:metabolism*; D006207:Half-Life; D052998:Microcystins / Q000378:metabolism*; D011549:Pseudomonas / Q000378:metabolism*
D052998:Microcystins; D002244:Carbon