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KMID : 1024520140230061101
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Journal of the Environmental Sciences
2014 Volume.23 No. 6 p.1101 ~ p.1109
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Evaluation of Biomass of Biofilm and Biodegradation of Dissolved Organic Matter according to Changes of Operation Times and Bed Depths in BAC Process
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Son Hyung-Sik
Jung Chul-Woo
Choi Young-Ik
Lee Geon
Son Hee-Jong
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Abstract
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In this study we followed biofilm formation and development in a granular activated carbon (GAC) filter on
pilot-scale during the 12 months of operation. GAC particles and water samples were sampled from four different
depths (-5, -25, -50 and ?90 cm from surface of GAC bed) and attached biomass were measured with adenosine
tri-phosphate (ATP) analysis and heterotrophic plate count (HPC) method. The attached biomass accumulated rapidly
on the GAC particles of top layer throughout all levels in the filter during the 160 days (BV 23,000) of operation and
maintained a steady-state afterward. During steady-state, biomass (ATP and HPC) concentrations of top layer in the
BAC filer were 2.1 μg·ATP/g·GAC and 3.3×108 cells/g·GAC, and 85%, 83% and 99% of the influent total
biodegradable dissolved organic carbon (BDOCtotal), BDOCslow and BDOCrapid were removed, respectively. During
steady-state process, biomass (ATP and HPC) concentrations of middle layer (-50 cm) and bottom layer (-90 cm) in the
BAC filter were increased consistently. Biofilm development (growth rate) proceed highest rate in the top layer of filter
(μATP = 0.73 day-1; μHPC = 1,74 day-1) and 78%∼87% slower in the bottom layer (μATP = 0.14 day-1; μHPC = 0.34 day-1).
This study shows that the combination of different analytical methods allows detailed quantification of the
microbiological activity in drinking water biofilter.
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KEYWORD
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Biological activated carbon (BAC), Biomass, Biodegradable dissolved organic carbon (BDOC), Bed volume, Bed depth, Growth rate
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