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입상 활성탄을 이용한 오수 처리수의 색도 및 유기물 제거
안규홍(Kyu Hong Ahn),송경근(Kyung Guen Song),권지향(Ji Hyang Kweon),차호영(Ho Young Cha) 한국수처리학회 1998 한국수처리학회지 Vol.6 No.2
A study was conducted to investgate the adsorption characteristics of granular activated carbon(GAC) for color and organic substances removal from the secondary treated effluent. The effluent from rotating biological contactor was used in batch tests, isotherm adsorption tests and fixed bed experiments. Single media column packed with GAC and dual media column packed with sand and GAC were used in fixed bed experiments. It was founded that adsorption rate of color in the secondary treated wastewater was slower than that of the synthetic organic matter, such as o-chlorophenol. The coefficient derived from Freundlich isotherm equation, 1/n, was about 1. It was concluded that it is difficult for GAC to adsorb color which is composed of complex matter. In fixed bed experiments, removal rate of organic substance increased with the degree of bed clogging. Time for 90% of breakthrough of color increased as empty bed contact time(EBCT) increased. Since premature breakthrough of color can occur when background organic matter(BOM) exists in water. It was also founded that longer EBCT than that generally applied (around 10 minutes) should be adopted, to obtain stable water quality.
간헐폭기공정 반응조에서 혐기성상태 침전슬러지층으로의 초산주입에 의한 생물학적 인 제거효율의 향상
안규홍(Kyu Hong Ahn),이형집(Hyung Jib Lee) 한국수처리학회 1998 한국수처리학회지 Vol.6 No.3
Enhancing biological P-removal from wastewater with low COD:P ratio by intermittent injection of acetate into the anaerobically settled sludge layer during settling and decanting periods was studied in an intermittently-aerated cyclic activated sludge process. Injection of acetate induces phosphorus (P) release and uptake by phosphorus accumulating bacteria (PAB). The wastewater used in this experiment was actual domestic wastewater with average concentration of TCODcr = 129.7 ㎎/L, TN = 67.4 mg-N/L, and TP = 6.5 mg-P/L. Effective P-release inside the sludge layer was observed. The P-release capacity of PAB was strongly dependent on the nitrate concentration and the denitrification activity inside the sludge layer. It was concluded that acetate injection into the settled sludge layer can be used as very effective and stable method for inducing P-release, provided certain factors are properly controlled. Other benefits of acetate injection include: (1) better pH control (0.6 higher when acetate injected), (2) maintainenance of stable and high MLSS concentration (5.6 ㎎/L MLSS increase per ㎎/L acetate COD injected, at steady state), and (3) the increase of TN removal rate (0.06 ㎎-N/L additional TN removed per ㎎/L acetate COD injected at steady state).
하수 재이용 ( 중수도 ) 을 위한 한외여과 공정에서 역세척 운전인자의 특성
안규홍(Kyu Hong Ahn),송경근(Kyung Guen Song) 한국수처리학회 1998 한국수처리학회지 Vol.6 No.1
To prevent membrane fouling, backwashing with permeate was applied to ultrafiltration process for wastewater reclamation. This study investigated the effect of backwashing factors such as the interval and duration, and proposed their adequate selection method for design. Backwashing with permeate was found to reduce membrane fouling significantly. Permeate flux decreased as backwashing interval increased. Since the degree of permeability recovery by physical washing (surface washing) reached its minimum value at the 30 minutes of backwashing interval (and didn`t change at longer intervals), it was concluded that the interval should be maintained less than 30 minutes. Permeate flux and permeability recovered by physical washing increased as backwashing duration increased. In the comparison of two backwashing conditions, decreasing backwashing interval was more efficient in enhancing permeability than increasing backwashing duration.