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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Water and Wastewater
Journal Basic Information
Journal DOI :
The Korean Society of Water and Wastewater
Editor in Chief :
Volume & Issues
Volume 24, Issue 6 - Dec 2010
Volume 24, Issue 5 - Oct 2010
Volume 24, Issue 4 - Aug 2010
Volume 24, Issue 3 - Jun 2010
Volume 24, Issue 2 - Apr 2010
Volume 24, Issue 1 - Feb 2010
Selecting the target year
Feasibility Study on Statistical Consideration of Effluent Quality Limits in Sewage Treatment Plants
Park, Kyoo-Hong ; Kang, Byeong-Joon ; Kim, Jae-Chel ; Choi, Ik-Hun ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 253~264
Treatment Characteristics and Application of DAF Process for Effective Solid Separation in BNR Municipal Wastewater Treatment System
Kwak, Dong-Heui ; Rhu, Dae-Hwan ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 267~276
Many plants have been improved to adapt the target of the biological treatment processes changed from organics to nutrients since the water quality criteria of effluent was reinforced and included T-N and T-P for the municipal wastewater treatment plant. To meet the criteria of T-N and T-P, the conventional biological reactor such as aeration tank in activated sludge system is changed to the BNR (biological nutrient removal) processes, which are typically divided into three units as anaerobic, anoxic and oxic tank. Therefore, the solid separation process should be redesigned to fit the BNR processes in case of the application of the DAF (dissolved air flotation) process as an alternatives because the solid-liquid separation characteristics of microbial flocs produced in the BNR processes are also different from that of activated sludge system as well. The results of this study revealed that the microbial floc of the anaerobic tank was the hardest to be separated among the three steps of the unit tanks for the BNR processes. On the contrary, the oxic tank was best for the removal efficiency of nutrients as well as suspended solid. In addition, the removal efficiency of nutrients was much improved under the chemical coagulation treatment though coagulation was not indispensable with a respect to the solid separation. On the other hand, in spited that the separation time for the microbial floc from the BNR processes were similar to the typical particles like clay flocs, over
ppm of air volume concentration was required to keep back the break-up of the bubble-floc agglomerates.
Modeling of Blades to Enhance Self-Power Generation in Pipe Flow
Yeo, In-Hwan ; Kim, Do-Yoon ; Paik, Jong-Hoo ; Lee, Young-Jin ; Shin, Min-Chul ; Park, Jae-Woo ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 277~285
We examined the optimal shape of blades and efficiency of a self-power generator when the self-power generator using flow of the water in pipe as the power source was installed. Selected factors were the shape of blades, the number of blades, pitch angle, and the existence of separator. GAMBIT2.4 was used as a modeling program, FLUENT6.3, which is computational fluid dynamics simulation program, was used as an analytical model. In the case of a viscous model, k-epsilon standard model was chosen. As a result, when the number of blades was increased, the efficiency and maximum moment were enhanced slightly. The pitch of blades went up, and maximum moment was also increased. The optimal pitch of blade was 62.5 degree and the efficiency was increased by 30%. The efficiency was also increased when a separator was installed.
Removal of toluene using the 2-stage hollow fiber membrane-hybrid reactor
Kim, Jin-Sung ; Gu, So-Hee ; Kim, Tae-Hyeong ; Lee, Myoung-Joo ; Hwang, Sun-Jin ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 287~293
In this study, the toluene gas in VOCs was removed using bioreactor which applied with hollow fiber membrane and Pseudomonas sp. TDB-4. The EBRT of each reactor are controlled 60 sec(R-1) and 30 sec(R-2) and inlet tolune concentration of both R-1 and R-2 is controlled from 25ppm to 500 ppm. Up to 500 ppm of toluene concentration, the toluene removal efficiency of R-1 and R-2 are 92% and 81%, and theirs removal capacities are about 100 g/
/hr and 180 g/
/hr, respectively. In addition, according to this study, toluene removal efficiencies at the hollow fiber are approximately 70%(60 sec) and 45%(30sec).
Design of the long perforated pipe in water treatment process using CFD
Cho, Young-Man ; Yoo, Soo-Jeon ; Roh, Jae-Soon ; Bin, Jae-Hoon ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 295~305
Role of the perforated pipe is to drain the water with equal pressure and velocity through the holes of perforated pipe. The perforated pipe is being used in many processes of water treatment system, however, the design parameter of perforated pipe is not standardized in korea. In this study, we have found the design parameter of perforated pipe in the water treatment system using the Computational Fluid Dynamics (CFD). The uniformity of outflow from the perforated pipe is directly affected according to area ratio(gross area of holes/surface area of the perforated pipe). In other words, the uniformity of outflow is improved as area ratio is smaller. Also, at the same area ratio, the uniformity of outflow is improved as number of holes is increase. Specially, in case of the two holes per length of pipe diameter(2/D) shows the most uniformity of outflow and the best hydraulic with the smaller pressure drop. The uniformity of outflow is aggravated and the pressure drop of pipe is decrease as length of pipe is longer. In case of that pipe length is 10m and above, the pressure drop decreased about 30% when diameter ratio is 40% with 0.2% of area ratio by comparison with 0.1% of area ratio.
A Feasibility study on Removal Characteristics of Taste and Odor using Bank Filtration Treatment
Maeng, Sung-Kyu ; Park, No-Suk ; Lim, Jae-Lim ; Kim, Seong-Su ; Jeong, Woo-Chang ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 307~317
This study was conducted in order to investigate bulk organic matter characteristics and behavior of geosmin and 2-methylisoborneol (2-MIB) during riverbank filtration, which are general surrogates of taste and odor in drinking water. Column studies were used to simulate bank filtration systems. Most of the aliphatic organic matter was removed effectively after soil passage, and it is believed to be polysaccharides according to LC-OCD and F-EEM analysises. Removal efficiencies of geosmin and 2-MIB within the filtration column reached above 95%. It was found that the removal of total dissolved organic matter has a correlation with that of geosmin and 2-MIB in the near of filtration surface (about 50cm).
An Application of CDM Project for Greenhouse Gas Reduction Activities in the Wastewater Treatment Systems
Kwak, In-Ho ; Hwang, Young-Woo ; Jo, Hyun-Jung ; Park, Kwang-Ho ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 319~332
In general, wastewater treatment systems consume high-energy consumption depending on operation characteristics of the facilities. Therefore, greenhouse gas(GHG) reduction activities that are application of digestion gas, induction of renewable energy etc. are conducted to reduce energy consumption and to increase energy independence ratio. In this study, GHG reduction in wastewater treatment system identified, searched application of Clean Development mechanism(CDM) approved methodology. If the methodologies apply to GHG reduction activities such as application of digestion gas, heat pump system using the wastewater as heat source, hydropower using the methodology determined CDM applicability, otherwise through several assumptions calculated expectable GHG reduction emissions and determined CDM applicability. As a result, the order of calculated GHG reduction emission showed that collected and energy generation of digestion gas is 66,775
/yr, gas engine cogeneration system is 8,182
/yr, heat pump system using the wastewater as a heat source is 72,715
/yr, and hydropower is 561
/yr. Consequently, the order of calculated Certified Emission Reductions(CERs) benefit showed that heat pump system using the wastewater, as a heat source is 1,381 million won/yr was estimated as the highest, followed by a collected and energy generation of digestion gas is 1,268 million won/yr.
Cause of Filtrate Deterioration and Its Improvement in Rapid Filtration
Kim, Jin-Keun ; Lee, Song-Hee ; Kim, Jae-Won ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 333~339
Particle removal is an important step taken at water treatment plants (WTPs) for the safety of tap water due to its proportionality to the pathogen inactivation. Government promulgated a treatment technique for the optimization of filtration including continuous turbidity monitoring using on-line turbidimeters. Based on the turbidity measurements of 460 filters at 31 WTPs operated by K-water, the evaluation of filtration performance and the investigation of major causes related to particle breakthrough were explored. 98.1 % of the filters had an effluent turbidity measurement which was less than 0.1 NTU, but turbidity breakthrough of more than 0.3 NTU was noticed occasionally which is in violation of AWWA 5-Star guidelines. It was shown that the optimization of coagulation, filter-to-waste, the observance of optimal filtration velocity and backwashing process based on filtrate turbidity were crucial for the improvement of filtrate.
The study of manganese removal mechanism in aeration-sand filtration process for treating bank filtered water
Choi, Seung-Chul ; Kim, Se-Hwan ; Yang, Hae-Jin ; Lim, Jae-Lim ; Wang, Chang-Keun ; Jung, Kwan-Sue ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 341~349
It is well known that manganese is hard to oxidize under neutral pH condition in the atmosphere while iron can be easily oxidized to insoluble iron oxide. The purpose of this study is to identify removal mechanism of manganese in the D water treatment plant where is treating bank filtered water in aeration and rapid sand filtration. Average concentration of iron and manganese in bank filtered water were 5.9 mg/L and 3.6 mg/L in 2008, respectively. However, their concentration in rapid sand filtrate were only 0.11 mg/L and 0.03 mg/L, respectively. Most of the sand was coated with black colored manganese oxide except surface layer. According to EDX analysis of sand which was collected in different depth of sand filter, the content of i ron in the upper part sand was relatively higher than that in the lower part. while manganese content increased with a depth. The presence of iron and manganese oxidizing bacteria have been identified in sand of rapid sand filtration. It is supposed that these bacteria contributed some to remove iron and manganese in rapid sand filter. In conclusion, manganese has been simultaneously removed by physicochemical reaction and biological reaction. However, it is considered that the former reaction is dominant than the latter. That is, Mn(II) ion is rapidly adsorbed on
-FeOOH which is intermediate iron oxidant and then adsorbed Mn(II) ion is oxidized to insoluble manganese oxide. In addition, manganese oxidation is accelerated by autocatalytic reaction of manganese oxide. The iron and manganese oxides deposited on the surface of the sand and then are aged with coating sand surface.
A Root Cause Analysis for Drought in Taeback City, Kangwon-do in 2008
Kim, Joo-Hwan ; Choi, Gye-Woon ; Park, Sang-Woo ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 3, 2010, Pages 351~359
Recently, there have been flood damages due to the climate change and the flash flood continuously in Korea and there are several flood disaster mitigation plans that are normally most of management plan for water related disasters even though drought disasters are as important as flood disasters. In this study, it is underlined that the research on solution of water shortness due to the drought disasters is currently required since the frequency of drought damage is not very many but continuously increasing. There was big drought damage in TaeBaek City of Kangwon province due to the serious lack of water during autumn, 2008 to spring, 2009. This study therefore analyses the characteristics of hydrometeorological conditions by rainfall frequency analysis and the operations of Gwangdong dam that is a source of multi-regional water supply by analysing water demand. As results of study, there was a drought with 20 years returning period which is not really available to fill the reservoir as usual and which could only filled 52% of reservoir. The rainfall during the dry season was less than normal, however, the water demand from the TaeBaek City was higher than normal. As researching several reasons of water shortness including the reasons described above, this study might be useful for drought mitigation plan.