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배병욱,전향배,임봉수 大田大學校 産業技術硏究所 1995 산업기술연구소 論文集 Vol.1995 No.9
본 연구에서는 이산화염소의 수질개선 효과와 이산화염소 부산물의 성상을 정량적으로 조사하였다. 발생기 이산화염소와 대청용수의 반응실험 결과에 의하면, 이산화염소를 2 mg/l 투입할 경우 반응 6시간후 시료의 TON(threshold odor number)은 100에서 50으로 감소하였으며, 반응 12 시간동안에 약 80%의 chlorophyll-a가 감소하였다. 한편, 청주취수탑 표층수의 DOC(dissolved organic carbon)는 Duozon 투입량 1.5 mg/l에서 14시간 동안 반응시켰을 때, 약 30% 감소하였다. 그러나, Duozon 투입량 3 mg/l까지는 투입량 증가에 따른 DOC 감소가 크지 않았다. In this study, the effect of chlorine dioxide(ClO₂) on the improvement of drinking water quality was investigated. In addition, by-products of chlorine dioxide, such as chlorine, chlorate, and chloride ion, were quantified by using ion chromatography. At chlorine dioxide dosage of 2 mg/l, TON(threshold odor number) of raw water decreased from 100 to 50 after 6 hrs of reaction and about 80% of chlorophyll-a decreased after 12 hrs. On the other hand, DOC(dissolved organic carbon) concentration decreased to 70% of initial value after 14-hr reaction at Duozon dosage of 1.5 mg/l. However, decrease in DOC was not remarkable as increasing Duozone dosage up to 3 mg/l.
박상민,박노백,전항배 충북대학교 건설기술연구소 2004 建設技術論文集 Vol.23 No.1
The effects of HRT and SRT on nitrification in activated sludge system were investigated at the temperature range of 10 to 25℃. HRT and SRT for lab-scale aeration tank were varied in the range of 4.5 to 13 hours and 7.5 to 20 days, respectively. Continuous aeration tanks fed with domestic sewage were supplied with oxygen up to 5 ㎎/L for efficient nitrification. In the steady state of operation period, maximum specific ammonium utilization rate by nitrifiers was 0.08g-NH₄/g-VSSㆍday at 20t however nitrification rate declined with the decrease of temperature. According to the decrease of SRT as well as temperature, biomass in the aeration tanks also decreased. Therefore, operating SRT and HRT have to be extended at low temperature. With the fixation of SRT to 7.5 days, 13 hours or higher HRT was required to achieve the nitrification efficiency of 90% at 10℃. Furthermore, SRT of aeration tank affect nitrification efficiency more by the temperature changes. In spite of 20 days or higher SRT, nitrification efficiency was 60% below 15℃. Accordingly, nitrifiers in the activate sludge system required over 8 hours of HRT and 20 days of SRT for nitrifying the 60% of influent ammonia below 15℃, especially in winter season.
완속여과 시스템에서 입자 제거와 손실수두(headloss)의 관계
신승식,홍진아,전항배 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.1
The operational performance of slow sand filters can be considerably improved by the application of a layer of non-woven synthetic fabric to the top surface of the sand media. This improvement is manifested in terms of an increased filter run time and the avoidance of headloss development within the sand media. The relationship between particulate removal and headloss development were investigated with two pilot-scale slow sand filters(filter A and filter B(ACF)) of which diameter was 140 mm and packed with sand in the depth of 850 ㎜. One of the filters was amended by covering the surface of slow sand filters with a ACF(activated carbon fiber) of which specific surface area was more than 1000 ㎡/g and thickness was 3 ㎜. Effective size and uniform coefficient of the sand medium was 0.31 ㎜ and 2.0 respectively. Initial filtration rate was 0.167 m/hr and the raw water turbidity and pH were in the range of 1.5-2.0 NTU, and 7.0-7.7, respectively. The particle removal efficiency of small than 2 ㎛ showed 86, 78% and greater than 3 ㎛ showed 96, 95% in the slow sand filter A and B(ACF), respectively. NPOC removed within upper 50 ㎜ depth and Schmutzdecke in slow sand filter B(ACF). Therefore, amended slow sand filter with non-woven fabric could reduce filter ripening time.
응집에 의한 생물학적 처리수의 색도 및 난분해성 유기물 제거
서태경, 박상민, 박노백, 임지영, 전항배 충북대학교 건설기술연구소 2008 충북대학교 건설기술연구소 논문집 Vol.27 No.1
This study was to evaluate the optimum conditions for chemical coagulation to remove color and non-biodegradable organic matters from the biologically treated water of piggery wastewater. Raw water was fractionated by characteristics of dissolved organic matter. The fractions of hydrophilic substance and molecular weight cut-off(MWCO) below 500 in raw water were 51% and 74%, respectively. SC(streaming current) was measured to find out the optimum pH values and dosages for aluminium sulfate[Al₂(SO₄)₃·14H₂O] and ferric chloride[FeCl₃·6H₂O] as a coagulant, which was compared with color and turbidity removal efficiencies followed by coagulation, flocculation and sedimentation. From several jar tests, optimum pH values and dosages of coagulants were well matched with the results of SCD analyses. The optimum dosages(pH values) of aluminium and ferric were 5.84 mM(pH 4.0) and 7.03 mM(pH 5.6), respectively. At optimum conditions of coagulation, color removal efficiencies for aluminium sulfate and ferric chloride were as high as 89.3 and 97.9%, respectively. Chemical coagulation showed good performance to remove color and non-biodegradable organic matters from biologically treated water.
전항배 ( Hang Bae Jun ),전동걸 ( Dong Jie Tian ) 충북대학교 산업과학기술연구소 2015 산업과학기술연구 논문집 Vol.29 No.1
Micro-floc growth at a various rapid mixing condition was investigated with synthetic water sample containing kaolin particles by standard jar tests. The growth and breakup of the micro-floc occurred during the rapid mixing process, and the rapid mixing condition with high intensity and short mixing time was unfavorable for the micro-floc formation. The major factor for micro-floc formation was velocity gradient, G product mixing time (G·t) values. Breakup of the micro-floc happened at G·t values above 30,000. At G·t values below 30,000, most favorable G values were below 300 sec-1. At G values above 400 sec-1 the micro-floc did not grow any more but it broke up at an extended mixing time. Ratio of Group 1 particles (below 8 ㎛) increased at higher alum dose, while those of Group 2 and 3 decreased. The optimum rapid mixing contions for micro-floc (larger than 8 ㎛) formation was at G values below 300 sec-1, t values below 150 sec, at G·t values below 30,000 and alum dose below 20 mg-alum/L, respectively.