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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 23, Issue 6 - Dec 2009
Volume 23, Issue 5 - Oct 2009
Volume 23, Issue 4 - Aug 2009
Volume 23, Issue 3 - Jun 2009
Volume 23, Issue 2 - Apr 2009
Volume 23, Issue 1 - Feb 2009
Selecting the target year
Construction of Integrated Water Supply system for Seoul Metropolitan Area
Kwon, Young-June ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 1~4
Application of ISMSGA(Individual Sewage Management System through Government Assistance) for the Individual Sewage Management to the TMDL
Cho, Deok-Hee ; Kim, Jong-Soo ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 5~11
Serial Use of Hydrodynamic and Water Quality Model of the Geum River using EFDC-Hydro and WASP7.2
Seo, Dong-Il ; Seo , Mi-Jin ; Koo, Myung-Seo ; Woo, Jae-Kyun ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 15~22
This study reports the serial use of a 3-D hydrodynamic model, EFDC-Hydro and a dynamic water quality model WASP7.2 maintained by USEPA. The 48 km section of the Geum River downstream between Daechung Dam and Gongju was selected as a sample study site. Topographical information was used to accurately represent morphology of the study site and boundary conditions were derived from governmental databases including WAMIS by Ministry of Land and Ocean and WEIS by Ministry of Environment. EFDC-Hydro was successfully calibrated for observed water level and WASP was calibrated using monthly observed water quality data obtained from the above sources. It was found that the current water quality target of BOD for the Geum River-H point could not be met on monthly basis though every other tributary of the area would meet their water quality targets as assigned in Korean TMDL. This study proposed the new target BOD water quality for the Gabcheon and the Mihocheon as 4.3 mg/l and 3.6 mg/l, respectively so that the Geum River-H point can meet the target. When Sejong City is constructed, it is estimated that effluent discharge limit of BOD must be less than 4.5 mg/l to meet water quality of the point. This study shows that it is possible to carry out more precise modeling considering both water movement and water kinetics by using combinations of EFDC and WASP.
Distribution characteristics of heterotropic bacteria population in slow sand filters
Park, Jong-Geun ; Kim, Seong-Su ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 23~30
Slow sand filtration (SSF) was the first engineered/mechanical filtration process used in drinking water treatment. In SSF, untreated water slowly percolate through a bed of porous sand. Biological activity within the sand bed have the strongest influence on removal efficiency of pollutants by slow sand filtration. In this study, the microbial population distributions in slow sand filters operated at the various operation conditions was evaluated. The concentrations of
CFU per g dry wt. were observed. No significant differences were seen between the number of filter-covered materials. The data indicate that the temperature has affect on population distribution. Also, the light exposure was influenced on microorganism in slow sand filtration according to the heterotropic plate counts. The role of microorganism within the sand media requires further study.
Characteristics of residuals from the 2nd-stage microfiltration in a dual membrane process
Lee, Seung-Ryul ; Kweon, Ji-Hyang ; Hur, Hyung-Woo ; Yeon, Kyeong-Ho ; Park, Ki-Young ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 31~37
Low-pressure membrane processes have been extensively expanded their applications to drinking water production in a few decades. As a capacity of a membrane plant becomes greater in recent years, proper methods to increase water production as well as to treat residuals have drawn great attention. A possible treatment option for the better water production is to apply a dual membrane system. The second stage microfiltration was installed and operated for approximately nine months. The residuals from the two stage microfiltration were investigated to learn their characteristics in settling and dewatering processes. The settlability of the membrane residuals were greatest at the SS concentration of approximately 15000mg/L. The proper dose of the polyelectrolytes for filterability were obtained in the range of 0.5
1%. In the dosage range, the water contents of the membrane residuals were greater but the SRF were lower than the residual from the conventional process.
Improvement of Water Treatment Efficiency by Poly Aluminum Chloride Overdosing in High pH Raw Water
Lim, Jae-Cheol ; Kim, Jin-Keun ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 39~46
A method to improve water treatment efficiency by coagulant overdosing for high pH raw water at a drinking water treatment plant (WTP) which had no pH adjusting facilities was investigated. Poly aluminum chloride (PACl) was used for coagulant, and turbidity removal efficiency was evaluated as a function of PACl dosage increases. pH and turbidity of supernatant of jar-tester were 7.10 and 0.50 NTU respectively, when the turbidity, pH, alkalinity, water temperature, conductivity of raw water were 1.75 NTU, 9.38, 46.5 mg/L, 6.4
/cm, respectively. Turbidity of settled water was reduced from 2.18 NTU to 0.28 NTU (87% reduction) when PACl dosage was increased from 16 mg/L to 45 mg/L at a full scale WTP. This can be attributed to the recovery of coagulant efficiency by pH reduction with the increase of coagulant dose, however coagulation efficiency was reduced with the formation of
by PACl addition at higher pH. Coagulant overdosing was proven to be a rapid and effective method for high pH raw water, which can be applied at drinking WTP.
Sewerage rehabilitation strategy based on sewer capacity evaluation
Ryu, Jae-Na ; Oh, Je-Ill ; Oh, Suk-Ho ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 47~55
Sewers are important national infrastructure and play an essential part by handling both wastewater and stormwater to minimise problems caused to human life and the environment. However, they can cause urban flooding when rainfall exceeds the system capacity. Sewer flooding is an unwelcome and increasingly frequent problem in many urban areas, and its frequency will increase over time with urbanisation and climate change. Under current standards, sewers are designed to drain stormwater generated by up to 10 year return period storms, but data suggests that many in practice have been experienced flooding with exceeding system capacity under increased storm events. A large number of studies has considered upgrading or increasing the design standard but there are still lack of information to propose a suitable return period with the corresponding system quantity to achieve. A methodology is required to suggest a proper level of standard within a suitable sewerage rehabilitation planning that can avoid the exceedance problem. This study aimed to develop a methodology to support effective sewer rehabilitation that could prevent urban flooding mainly resulted from the exceedance of existing storm sewer system capacity. Selected sewerage rehabilitation methods were examined under different storm return periods and compared to achieve the best value for money.
Overcapacity of Water Treatment Plants in Korea
Lee, Sang-Eun ; Park, Hee-Kyung ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 57~67
Under the supply-oriented policy, efficiency and rationale have not been fully considered in planning of water supply facilities in Korea. As a case, this study shows that large-size systems are suffering from overcapacity problem of water treatment plants, and thus discusses what options should be applied to deal with inefficiency. Water demand of large-size systems has suddenly decreased for the last 10 years while water demand has been often assumed to increase at a regular rate in planning of plants according to excess capacity hypothesis. This inconsistency led to a serious overcapacity. In 2006, total excess capacity of nine large-size systems was more than 1.2 times as large as maximum daily demand of total customers in Seoul. However, their options are expected to stay ex post facto. To prepare the risk of overcapacity, and draw large benefits out of the plants, the authors and other professionals in Korea should further discuss the more adaptive method for prediction of water demand, and systems integration between a large-size system and adjoining systems.
Characteristics of Disinfection and Removal of 2-MIB Using Pulse UV Lamp
Ahn, Young-Seog ; Yang, Dong-Jin ; Chae, Seon-Ha ; Lim, Jae-Lim ; Lee, Kyung-Hyuk ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 69~75
The characteristics of disinfection and organic removal were investigated with pulse UV lamp in this study. The intensity and emission wavelength of pulse UV Lamp were compared with low pressure UV lamp. The emission spectrum range of pulse UV lamp was between 200 and 400 nm while the emission spectrum of low pressure UV lamp was only single wavelength of 254nm. 3 Log inactivation rate of B. subtilis spore by pulse UV and low pressure UV irradiation was determined as 44.71 mJ/
, respectively. This results implied that wide range of emission spectrum is more effective compared to single wavelength emission at 254nm. 500ng/L of initial 2-MIB concentration was investigated on the removal efficiency by UV only and UV/
process. The removal efficiency of UV only process achieved approximately 80% at 8,600 mJ/
dose. 2-MIB removal rate of UV/
) process was 25 times increased compared to UV only process. DOC removal efficiency for the water treatment plant effluent was examined. The removal efficiency of DOC by UV and UV/
was no more than 20%. Removal efficiency of THMFP(Trihalomethane Formation Potential), one of the chlorination disinfection by-products, is determined on the UV irradiation and UV/
process. Maximum removal efficiency of THMFP was approximately 23%. This result indicates that more stable chemical structures of NOM(Natural Organic Matter) than low molecule compounds such as 2-MIB, hydrogen peroxide and other pollutants affect low removal efficiency for UV photolysis. Consequently, pulse UV lamp is more efficient compared to low pressure lamp in terms of disinfection due to it's broad wavelength emission of UV. Additional effect of pulse UV is to take place the reactions of both direct photolysis to remove micro organics and disinfection simultaneously. It is also expected that hydrogen peroxide enable to enhance the oxidation efficiency on the pulse UV irradiation due to formation of OH radical.
Water Quality Monitoring for Corrosion Control in Waterworks System
Lee, Hyun-Dong ; Kwak, Pill-Jae ; Lee, Ji-Eun ; Kim, Yeong-Kwan ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 77~87
In existing systems, the best method inhibiting corrosion control in water distribution systems is to reduce water corrosiveness. Water corrosion can be decreased by controlling water quality through simple water treatment in treatment plants. On this research, we study the characteristics of tab water qualities in domestic areas, assessment of corrosive water quality and the method of water quality monitoring. This review presents the method of water quality monitoring which is the most applicable. Monitoring for corrosion control in waterworks system is the most proper method; It can prevent serious accidents economically and reduce civil appeals. Surely we should assess corrosive water quality in tab water, and introduce water treatment methods to control corrosive water quality before monitoring for corrosion. According to a lot of researches, it has been proved that simple water treatments can reduce the pipe corrosion. In this review we should indicate that we do not control of the corrosive water quality due to domestic conditions, we should monitor the water quality basically. Therefore, we recognize how the existing water quality can cause problems on pipeline corrosion, how to deal with it. Then it will be possible to apply water quality monitoring for corrosion control in water distribution system. Monitoring for corrosion control can be expressed by LI index, it is already known in literatures. This review presents more simple method than existing methods than existing ones we expect to apply these methods to SCADA in the future.
A Study on Feasibility Analysis of Sewer Rehabilitation
Han, Ihn-Sup ; Chang, Dae-Hwan ; Woo, Byung-Ha ; Lim, Chul-Hwan ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 89~96
Feasibility which is complimented before Social Overhead Capital Project and National Policy Project is analyzed by economic and political benefits. The projects will be performed if the benefits are bigger than the project cost. In this study, feasibility was examined at various viewpoints on sewer rehabilitation projects implemented with private capitals. To achieve the feasibility analysis, the B/C (Benefit/Cost Ratio), IRR (Internal Rate of Return) and the returns ratio of the Build Transfer Lease project implemented in 2007 at W city were estimated. At the same time, the correlation with B/C and benefit sensitivity of concessionary rate fluctuation were analyzed to evaluate the efficiency and feasibility of the seven sewer rehabilitation projects promoted by a local autonomous entity.
A Study on the Characteristics of Water Quality According to Particle Size Distribution of Sediments
Park, Sung-Jin ; Kim, Hwan-Gi ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 97~105
Analysis was done on the particle size distribution of sediments flown into Saemangeum from the Mankyung and Dongjin River. The organic pollutants and heavy metal existing in the sediments were analyzed, which was further used to study the properties of pollution in the sediments according to the particle size distribution. Conclusions shown below were made from these analyses. The particle size distribution showed a big difference between the upriver areas of Mankyung and Dongjin River. Particles under 75
showed to be around 85% at Dongjin River, while it showed to be around 70% at Mankyung River. This kind of distribution in particle size concluded in greatly affecting the contamination density of the sediments. From the analysis done on the soil type of sediments, deposition in Mankyung River categorized into Silty loam and Sandy loam, where Silty loam covered most of area and deposition in Dongjin River categorized into Sand, Loamy sand, Silty loam, Sandy loam. Considering the weight ratio, the density of contamination of the sediments by particle size at Dongjin and Mankyung River has been analyzed to show that organic pollutants and heavy metals occupy more than 70% of the whole contamination in the range under the particle size of 75
Evaluation of Head Loss within In-Line Mixer for Water Treatment using CFD Technique
Hwang, Young-Jin ; Lim, Sung-Eun ; Kim, Seong-Su ; Park, No-Suk ; Wang, Chang-Keun ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 107~112
This study was conducted for verification and systematization of estimation method about the headloss using CFD(Computational Fluid Dynamics). Head loss which happens between the inlet and outlet of in-line mixer can be a major factor for the design and construction. Also, this Case studies about the sensitivity related to the velocity in the piping system. As result, program's default calculation function was used to get each side's total pressure and the differential of each total pressure could be defined as head loss from in-line mixer. In the case of adopting pipe surface friction factor and geometry loss, Calculation residual can be much more reduced. It was found that residual of value between CFD method and field test ranged about 3 through 18 precent.
Use of Cork Oak Bark for Phosphorous Removal from Wastewater
Yang, Kyung-Min ; Kim, Yeong-Kwan ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 113~119
The feasibility of using cork oak bark for phosphorus removal from wastewater was evaluated in this study. Recently, development of more cost-effective media while maintaining high efficiency in pollutants removal has received concern. Barks have a negative surface charge and, hence, tend to show a high affinity to bind cations, and they need to undergo chemical modification to increase their adsorption capacity of anions. Bark was hydrolyzed by HCl solution and it received modification using an aqueous solution of high molecular weight polyethylenimine(PEI). Surface modification with HCl and PEI resulted in a decrease of specific surface area of the bark from 1.932
/g to 1.094
/g. The adsorption experiments were carried out in batch tests and the data were fitted to the Langmuir isotherm and Freundlich isotherm equations. Phosphate removal rate was higher at the lower solution pH possibly due to the form of phosphate ion in solution. For the initial phosphate concentration of 10 mg/L, maximum adsorption was 20.88 mg P/g at pH 3 and 12.02 mg P/g at pH 5. Mechanism of phosphorus sorption onto the HCl-PEI bark was examined through FT-IR spectrometer. Ion exchange between
appeared to be a key mechanism of phosphate adsorption onto the HCl-PEI bark surface.
Influences of Detention Time, Particle Size Distribution, and Filter Medium on Waterworks Sludges Dewatering
Kim, Kwang-Soo ; Lee, Jae-Bok ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 121~128
Objectives of this study were to investigate influencing factors of detention time, particle size distribution, and filter medium characteristics for waterworks sludge dewatering. The stepped pressure filtration was carried out with lab scale apparatus and the filter press pilot test for dewatering was conducted at the water treatment plant. Effects of filter medium and polymer dose were examined through observing water content and dewatering velocity and cyclic dewatering rate with filter press pilot test. Relationships among detention time, particle size distribution and filtration resistance were analyzed. Prolongation of sludge detention time was found to cause blinding phenomenon in cake and filter medium and to decrease dewatering process efficiency. The average specific resistance increased according to detention time. In pilot test of dewatering for thickened sludge with Nylon Multi-NY840D and Nylon Mono-100% filter media, dewatering velocities were 0.92 and 0.93 kg DS/
hr according to 0.1% polymer dose of dried solids weight base. And cyclic dewatering rates were 2.45 and 2.50 kg DS/
cycle for the Nylon Multi-NY840D and Nylon Mono-100% media. Dewatering velocity of polymer dosed sludge was observed to be higher than that of non-polymer sludge.
Removal characteristic on micropollutants as ibuprofen, acetaminophen, caffeine in small water fall system using HBC ring media
Dockko, Seok ;
Journal of Korean Society of Water and Wastewater, volume 23, issue 1, 2009, Pages 129~135
PPCP (pharmaceuticals and personal care products) is known as micropollutant that is released from wastewater treatment plant. Research represents that these contaminants have increased in the last 10 years. This study tries to make four different trickling filter systems using plastic fiber media to remove PPCP such as acetaminophen, ibuprofen, caffeine. The results of the experiment that compare the process efficiencies of four different systems (A, B, C and D) using HBC media show that almost all the reactor has around 95% removal efficiency. Slope type of HBC reactor has twice higher efficiency rather than submerged type reactor to remove PPCP in water system. In 8 hours, 89% of acetaminophen, ibuprofen, caffeine are removed in slope type reactor while 39% of them in submerged type.