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KMID : 1024520120210121495
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Journal of the Environmental Sciences
2012 Volume.21 No. 12 p.1495 ~ p.1501
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Pollutant Removal in Variable HRT Using the Aerobic Biofilm
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Ahn Kwang-Ho
Ko Kwang-Baik
Kim I-Tae
Kim Kwang-Soo
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Abstract
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In this study, an experiment was conducted on influent water with low concentrations of organic matter, such as river water or secondary treatment water of a sewage treatment plant, according to HRT changes by using aerobic biofilm. In the biofilm process, as the biofilm increases in thickness, the inner membrane can be low in oxygen transfer rate and become anaerobic conditions, while the detachment of biomass from biofilm occurs. To overcome these limitations in the detachment of microorganisms in biofilm, the yarn, which was made from poly propylene(PP), was weaved and manufactured into a tube. Then, a test was carried out by injecting air so that the interior of the biofilm could create aerobic conditions. The results of the experiment showed that the removal efficiency of TCODcr reached 66.1∼81.2% by HRT 2hr, and 50.9 ∼61.8% after HRT 1 hr. The removal efficiency of SCODcr was 45.9 to 55.1% by HRT 1hr, and 26.1% in HRT 0.5hr, showing the highest removal efficiency in HRT 1hr. The SS removal efficiency was at 81.8 to 94.6%, and the effluent SS concentration was very low, indicating less than 2.2 mg/L in all HRT's. As a result, the SCODcr and NH4 + -N that were removed per specific surface area and attached to microbial biofilm showed the highest efficiency in HRT 1hr with 8.37 gSCODcr/m2 ·d, 2.93 gNH4 + -N/m2 ·d. From the result of reviewing the characteristics of biofilm growth, microorganisms were found to be attached, and increased by 36 days. Later, they decreased in number through detachment, but showed a tendency to increase again 41 days later due to microbial reproduction.
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KEYWORD
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Pollutant removal, Aerobic biofilm, HRT, Microorganisms
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