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정호진(Ho Jin Chung),구봉헌(Bong Hun Koo) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.2
N/A This study was performed to improve an Activated Sludge Processes using a Fixed Biofilm Reactor. Advantages of the process include decrease in the residence time and reduction of the sluge volume. Operating parameters were investigated during long-term performance tests. Among the reaction times of 2.5, 3.5, and 5 hours, 2.5 hours was the most efficient and economical. In the experiments, 9㎎/L, 9㎎/L and 8㎎/L of effluent were obtained, respectively, which showed 90% BOD, 86% COD and 85% SS removal. In comparison with the Activated Sludge Processes, the amount of generated sludge was reduced by 75% and turbidity of effluent was as low as 4NTU. Further studies are needed for applications in large public wastement treatment plants and small business plants, based on this study.
정호진(Ho-Jin Chung),이주헌(Joo-Heun Lee) 계명대학교 낙동강환경원 2012 環境科學論集 Vol.16 No.1
The water treatment method using photocatalysis, one of the advanced oxidation treatment methods, is the most efficient which decomposes hazardous pollutants. During the waste water treatment, pollutants are removed through oxidation process. Especially, in this treatment, no secondary pollutants are produced. TiO₂ is a typical material which satisfies various conditions for photocatalysis. It is not only quantitatively abundant in nature, but also environmental friendly material. It is very stable chemically and biologically. For this reason, this study is designed to derive optimal conditions to remove organics in waste water through photocatalysis oxidation using TiO₂, and to elaborate the treatment efficiency. According to the experimental results, the removal rate of COD is 24.4%(from 102.5 to 77.5㎎/l) in Type 5. The removal rate of turbidity is 83.6%(from 49.5 to 8.1NTU) in Type 5. When the amount of TiO₂ and UV injection was increased, the removal efficiency was also increased. Better efficiency was obtained when the amount of TiO₂ was increased, compared to the amount of UV injection. In the process of advanced oxidation treatment of waste water, better treatment efficiency can be obtained, if factors which are necessary for the removal of organics are applicable to the various conditions of sites.
고도 정수처리에서 응집공정의 개선에 의한 활성슬러지 플록의 밀도 측정에 관한 연구
정호진(Ho Jin Chung) 한국수처리학회 1998 한국수처리학회지 Vol.6 No.2
Flocculation is one of the important processes in water and wastewater treatment. The physical properties of flocs such as size and density are significant factors influencing solid-liquid separation processes. During flocculation, floc size and density can be changed depending on physical conditions. In this study, by developing new optical technique, we measure flocculation process in on-line manner to understand the flocculation phenomena in more detail. We also seek to improve the efficiency in advanced water treatment by studying the properties of bioflocs produced in activated sludge processes. The obtained results are as follows: It is found that the log-log graph of turbidity(τ) against specific turbidity(τ/φ) shows a straight line with the slope 2(m-1) or 2(2-D)/D. In this case, if we use fractal dimension(D), it is possible to interpret the structure of aggregates in three dimension. Because it is also possible to investigate the flocculation phenomena depending on various conditions, we can control the flocculation process more effectively in advanced water treatment applications. It is also found that bioflocs are shown as large and loose. If we analyse the efficiency of biological treatment by the structure of aggregates, better efficiency are obtained by increasing Hydraulic Retention Time(HRT). Although more work must be put on this, if we define structural properties of flocs in on-line manner, it is possible to investigate the flocculation processes more effectively.
정호진(Ho Jin Chung) 한국수처리학회 1997 한국수처리학회지 Vol.5 No.2
During a flocculation process, the fractal aggregate has various shape and structure. Floc characteristics which are important for settling are size, effective density, and shape. It is difficult to measure the properties of flocs by direct methods, because flocs are very fragile and difficult to handle. Turbidity fluctuation techniques are useful for measurement without any breakage of floc. This method is based on the mesurements of flocculation in the intensity of light transmitted through the suspension. In this study, the observed floc size-density relationships demonstrated that floc density generally decreases with increasing floc size. The slope of size-density function changes depending on flocculating conditions. Fractal dimension D, varies depending on turbidity. It has been obtained that the value D is bigger than 2 for polymeric flocculation. This indicates that flocs are dense, small and compact. This is important information for a better understanding of the flocculation phenomenon.