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Transient CFD 모사기법을 이용한 정수지 최적설계 사례연구
김선진,김성수,박노석,차민환,왕창근 대한상하수도학회 2010 상하수도학회지 Vol.24 No.4
From the results of tracer test for the existing clearwell in Y water treatment plant, T10 and T10/T were calculated as 150 min and 0.24, respectively. Therefore it required the modification schemes for improving hydraulic efficiency, surrogated by T10 and T10/T, and disinfection performance. In this study, using transient CFD(Computational Fluid Dynamics) simulation technique, tracer tests on dynamic condition for the suggested schemes were simulated. From the results of simulation, it was revealed that 8~6 baffles are necessary to guarantee the disinfection ability in the existing clearwell. Also, installing orifice baffle in the vicinity of inlet could increase plug flow fraction within clearwell.
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담체 종류에 따른 바이오필터의 톨루엔과 암모니아 분해능 평가
김선진,김태형,황선진 대한상하수도학회 2012 상하수도학회지 Vol.26 No.6
Contribution of immobilized media with bacteria to the odor removal was evaluated in a lab scale bio-filter compared to that with sponge or ceramic media without the immobilized bacteria. Candida tropicalis for volatile organic compounds and ammonium oxidizing bacteria (AOB) for inorganic compounds were used as seeds in lab-scale bio-reactors. Three different type of media in the bio-reactors that immobilized bioreactor (IBR), sponge bioreactor (SBR), and ceramic bioreactor (CBR) were examined, respectively. An empty bed contact time (EBCT) of the bio-filters was fixed as 60 seconds, and the inlet concentration of toluene was changed from 20 ppm to 200 ppm to observe the removal efficiency depending on the concentrations. As a result, the maximum elimination capacities of IBR, SBR, and CBR were 166 g/m3/hr, 138 g/m3/hr, and 138 g/m3/hr, respectively. In addition, toluene as an organic compound and ammonia as an inorganic compound were applied together with different inlet concentrations varied from 80 ppm to 250 ppm of toluene and from 2.5 ppm to 40 ppm of ammonia. The toluene maximum elimination capacities in IBR, SBR, and CBR were 97.4 g/m3/hr, 59.5 g/m3/hr, and 81.9 g/m3/hr, respectively. The ammonia maximum elimination capacities were reached as 7.2 g/m3/hr in IBR, 6.6 g/m3/hr in SBR, and 7.0 g/m3/hr in CBR Contribution of immobilized media with bacteria to the odor removal was evaluated in a lab scale bio-filter compared to that with sponge or ceramic media without the immobilized bacteria. Candida tropicalis for volatile organic compounds and ammonium oxidizing bacteria (AOB) for inorganic compounds were used as seeds in lab-scale bio-reactors. Three different type of media in the bio-reactors that immobilized bioreactor (IBR), sponge bioreactor (SBR), and ceramic bioreactor (CBR) were examined, respectively. An empty bed contact time (EBCT) of the bio-filters was fixed as 60 seconds, and the inlet concentration of toluene was changed from 20 ppm to 200 ppm to observe the removal efficiency depending on the concentrations. As a result, the maximum elimination capacities of IBR, SBR, and CBR were 166 g/m3/hr, 138 g/m3/hr, and 138 g/m3/hr, respectively. In addition, toluene as an organic compound and ammonia as an inorganic compound were applied together with different inlet concentrations varied from 80 ppm to 250 ppm of toluene and from 2.5 ppm to 40 ppm of ammonia. The toluene maximum elimination capacities in IBR, SBR, and CBR were 97.4 g/m3/hr, 59.5 g/m3/hr, and 81.9 g/m3/hr, respectively. The ammonia maximum elimination capacities were reached as 7.2 g/m3/hr in IBR, 6.6 g/m3/hr in SBR, and 7.0 g/m3/hr in CBR
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Mixotrophic 미세조류를 이용한 유기물 및 영양염류 제거에 미치는 pH 및 폭기의 영향
김선진,이윤희,황선진 대한상하수도학회 2013 상하수도학회지 Vol.27 No.1
Specific growth rate and removal rate of nitrogen and phosphorus of Chlorella sorokiniana, Chlorella vulgaris, Senedesmus dimorphus those are able to metabolite mixotrophically and have high nitrogen and phosphorus removal capacity were examined. Based on the results, one microalgae was selected and conducted experiments to identify the operating factors such as pH and aeration rate. The specific growth rate and phosphorus removal rate of C. sorokiniana significantly presented as 0.29 day-1 and 1.65 mg-P/L/day, while the nitrogen removal rate was high as 12.7 mg-N/L with C. vulgaris. C. sorokiniana was chosen for appropriate microalgae to applying for wastewater treatment system and was cultured in pH ranged 3 to 11. High specific growth rate and removal rate of nitrogen and phosphorus were shown at pH 7 as 0.71 day-1, 7.61 mg-N/L/day, and 1.24 mg-P/L/day, respectively. The specific growth rate examined with aeration rate between 0 and 2 vvm (vol/vol-min) highly presented as 1.2 day-1 with 1.5~2 vvm, while the nitrogen removal rate was elevated with 0.5 vvm as 9.43 mg-N/L/day.
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유·무기성 악취저감을 위한 최적의 미생물 포괄고정담체 제조법에 관한 연구
김선진,김태형,이윤희,장현섭,송지현,황선진 대한상하수도학회 2012 상하수도학회지 Vol.26 No.1
A bio-encapsuled media was developed to apply on reducing odors produced from organic waste treatment process. The microorganism, candida tropicalis, was encapsulated in sponge media consisted of polyurethane material. Sodium alginate as a natural polymer which does not affect to hydrophilic microbes and PEGDA(poly ethylene glycol diacrylate) as a artificial polymer were used for the encapsuled media. The media was evaluated with TMEDA (N,N,N',N'-tetramethylethylenediamine, 0.02∼0.1%) as a catalyst at different temperature 25 and 35℃. The best performance was achieved with 0.02% of TMEDA at 25℃. The microbes'activity in the media was examined by Live/Dead cell method.
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미생물 포괄고정화 담체를 적용한 파일럿 스케일 바이오필터에서의 복합악취 제거
김선진,김태형,이윤희,장현섭,송지현,황선진 대한상하수도학회 2011 상하수도학회지 Vol.25 No.5
A pilot-scale biofilter was constructed to discover degradation characteristics of the complex odor discharged from Ansan wastewater treatment plant. Candida tropicalis for volatile organic compounds, sulfur oxidizing bacteria(SOB) for hydrogen sulfide, and bacteria extracted from feces soil were immobilized on a polymer gel media. According to this study, the EBCT was varied from 36 sec to 18 sec. Toluene was removed as 80% along the variations, but it was recovered as 100% within 1 week. All benzene and xylene were removed during the operation while the efficiency of hydrogen sulfur was temporary decreased at 18 sec of EBCT, thereafter it was recovered to 100% within a week. The maximum elimination capacities of the benzene, toluene, xylene, and hydrogen sulfur were 6.6 g/m3/hr, 31.7 g/m3/hr, 7.8 g/m3/hr, and 133.6 g/m3/hr, respectively. There were merits on removal both organic and inorganic complex odor using the pilot-scale biofilter embedded with microorganisms immobilized on polymer gel media.
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