Journal
BIOFOULING
Volume 30, Issue 10, Pages 1225-1233Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08927014.2014.970538
Keywords
Bdellovibrio bacteriovorus; membrane filtration; irreversible fouling; alum; powdered activated carbon
Funding
- Creativity and Innovation Project - UNIST (Ulsan National Institute of Science and Technology) [1.120051.01]
- R&D Center for Valuable Recycling (Global-Top R&D Program) of the Ministry of Environment [2014001160002]
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This study evaluated the co-application of bacterial predation by Bdellovibrio bacteriovorus and either alum coagulation or powdered activated carbon adsorption to reduce fouling caused by Escherichia coli rich feed solutions in dead-end microfiltration tests. The flux increased when the samples were predated upon or treated with 100 ppm alum or PAC, but co-treatment with alum and predation gave the best flux results. The total membrane resistance caused by the predated sample was reduced six-fold when treated with 100 ppm PAC, from 11.8 to 1.98 x 10(11) m(-1), while irreversible fouling (R-p) was 2.7-fold lower. Treatment with 100 ppm alum reduced the total resistance 14.9-fold (11.8 to 0.79 x 10(11) m(-1)) while the R-p decreased 4.25-fold. SEM imaging confirmed this, with less obvious fouling of the membrane after the combined process. This study illustrates that the combination of bacterial predation and the subsequent removal of debris using coagulation or adsorption mitigates membrane biofouling and improves membrane performance.
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