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정수처리시 잔류알루미늄 농도를 최소화하기 위한 영향인자 고찰
고영송,우달식,남상호 한국환경보건학회 1993 한국환경보건학회지 Vol.19 No.2
In public water supply systems, Alum and/or PAC being used as a coagulant. It is well known that their use increased frequently the concentration of residual aluminum in filtered water upon operating conditions. This study was conducted to find the optimum conditions that both the concentration of residual aluminum and turbidity are minimized by changing such factors as pH, temperature, alum dosage, mixing rate, alkalinity and hardness. The results can be summarized as follows: The pH values for the minimum concentration of residual aluminum and turbidity as a given experimental condition were found at pH 6 and pH 7 respectively, the apparent clarity was best at pH 8. The floc settling rate was the greatest at pH 6.5, but the turbidity was high at the same condition. The more alum dosage, the higher the concentration of residual aluminum. However the alum dosage less than 15 mg/l tend to decrease in turbidity. Restabilization and enmeshment occurred near 15 mg/l and 20 mg/l of alum dose respectively. With the increase of mixing rate (rapid and slow), the concentration of residual aluminum and turbidity are increased and the same trend was found in increment of mixing time. At low water temperature, the concentration of residual aluminum was decreased, but turbidity was increased. It was confirmed that alkalinity had an effect on the coagulation efficiency, but hardness did not.
남상호,고영송 한국물환경학회 1994 한국물환경학회지 Vol.10 No.4
In public water supply systems, Alum and/or PAC has been used as a coagulant. It is well known that in general their use led residual aluminum concentration increased in filtered water. This study was conducted to investigate the optimum conditions that both the concentration of residual aluminum and turbidity are minimized. At the same time, the physical characteristics of floc such as floc strength. floc settling rate, floc size and type were observed. The results obtained at a given experimental condition can be summarized as follows. With the increase of mixing rate, rapid and slow, both the concentrations of residual aluminum and turbidity were increased and the same trend was observed in increment of mixing time. The size of floc produced was smaller in high rapid mixing rate, and the larger floc was more complex in the shape. The mean size of floc produced was 33-63㎛ in diameter. The concentrations of residual aluminum and turbidity were increased with the increment of mechanical floc breakup strength. When the degree of floc breakup was large. the reunion capacity was more deteriorated, by consequent, the flocs showed slow settling rate.
김중구,고영송,남상호 한국환경보건학회 1994 한국환경보건학회지 Vol.20 No.4
A study was carried out in order to investigate the removal efficiencies and removal characteristics of heaw metals such as Pb, Cd, Cr, Cu in raw water by one of conventional water treatment processes. The coagulants used in this study were Alum and PAC. Three kinds of water samples were provided: kaolin water, kaolin water mixed with humic acid and raw water from Han River mixed with suspended matter deposited on raw water inlet pipe. Heaw metals were added to the water samples with their respective turbidity, and jar tests were performed. In the results from heaw metal removal studies, lead might be adsorbed or exchanged on the particle surface (SS) rather than react with organic matter added. Cadmium was affected on the dissolved organic matter. Chromium was affected by the both dissolved organic matter and SS concentration, and the restabilization and the enmeshment appeared at moderate (50~80 NTU) and high (100 NTU) turbidity as defined in this experimenL The removal efficiency of copper was relatively little affected by the dissolved organic matter but by SS concentration in comparison with other heavy metals. In these studies as to the raw water turbidities and concentration of heaw metals, it is proved out that the removal efficiency on heaw metals in both cases of PAC and Alum as coagulants was not significantly different.
오존처리에 의한 Humic acid 의 BDOC 생성에 관한 연구 (1)
민왕기,고영송,남상호 ( Wang Gi Min,Young Song Ko,Sang Ho Nam ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.3
This study is to investigate the characteristics of changes in Humic acid before and after ozonation. The results were compared with such terms as COD_(Cr),(K₂Cr₂O_7), COD_(Mn)(KMnO₄), UV_(254)(Ultra-violet absorbance, λ 254), BDOC and yield coefficient after ozonation of Humic acid were determined by the means of Heterotrophic plate count(HPC) method and Total Organic Carbon(TOC) analyzer. The percentage of BDOC in DOC of Humic acid before the ozonatiott was 4%, which was relatively low. The yield coefficient of HPC per Humic acid was 3.8 × 10^7 CFU/㎎ which is equivalent to 2.3 × 10^9 CFU/㎎ of BDOC. UV_(254) was more sensitively decreased than CUD_(Cr) and COD_(Mn). From this fact, it was inferred that the characteristics of Humic acid was changed by the different levels of ozone oxidation. As a result of ozonation. BDOC was increased. But at the maximum BDOC level, the concentration of ozone per ㎎ DOC was l㎎ to 1.5㎎ and 1.9㎎ at a ozone concentration of 2㎎/ℓ in the solution. The yield coefficient of BDOC was also increased.
남상호,고영송,조선형 대한상하수도학회 1996 상하수도학회지 Vol.10 No.3
The pulverized wastes originated from kitchen garbage grinder cause an additional load in sewage treatment plant and water environment. Therefore, several problems occur in sewer, such as microbial corrosion, odor, psychoda and fly interrupting flow of sewage etc. by their precipitation with earth and sand. This study was conducted on two experiments: hydrogen sulfide gas generation from sediments in sewer and anaerobic batch test. In anaerobic batch test, gas generation was increased when organic compounds were increased in concentration. Sulfide was decreased upon decreasing in sulfate concentration. In H_2S gas generation test along the depth of sediments there were two different sampling sites which are apart from about 50 cm each other in a menhole. The one has the thickness of 55 cm from the surface, the other, of 60 cm. The hydrogen sulfide gas production rates were measured based on ranges from 0 to 10 cm, 10 to 20 cm, 20 to 30 cm for two samples. The results obtained were 1.08, between 0 to 10 cm in depth for the sample thickness of 55 cm and 3.07, 5.36, 5.42 ㎍/g-VSㆍhr in order of depth for the sample thickness of 60 cm, respectively.