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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Water and Wastewater
Journal Basic Information
Journal DOI :
The Korean Society of Water and Wastewater
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Volume & Issues
Volume 21, Issue 6 - Dec 2007
Volume 21, Issue 5 - Oct 2007
Volume 21, Issue 4 - Aug 2007
Volume 21, Issue 3 - Jun 2007
Volume 21, Issue 2 - Apr 2007
Volume 21, Issue 1 - Feb 2007
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Treatment of Industrial Wastewater including 1,4-Dioxane by Fenton Process and Electrochemical Iron Redox Reaction Process
Lee, Sang-Ho ; Kim, Pan-Soo ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 375~383
Treatment efficiency research was performed using Fenton process and the electrochemical process in the presence of ferrous ion and hydrogen peroxide for the industrial wastewater including 1,4-Dioxane produced during polymerization of polyester. The Fenton process and the electrochemical Iron Redox Reaction (IRR) process were applied for this research to use hydroxyl radical as the powerful oxidant which is continuously produced during the redox reaction with iron ion and hydrogen peroxide. The results of CODCr and the concentration of 1,4-Dioxane were compared with time interval during the both processes. The rapid removal efficiency was obtained for Fenton process whereas the slow removal efficiency was occurred for the electrochemical IRR process. The removal efficiency of CODcr for 310 minutes was 84% in the electrochemical IRR process with 1,000 mg/L of iron ion concentration, whereas it was 91% with 2,000 mg/L of iron ion concentration. The lap time to remove all of 1,4-Dioxane, 330 mg/L in the wastewater took 150 minutes with 1,000 mg/L of iron ion concentration, however it took 120 minutes with 2,000 mg/L of iron ion concentration in the electrochemical IRR process.
Estimation of Willlingness-to-pay of Residents for Rehabilitation of the Existing Water Pipes at Inche
Lee, Jae-Hoon ; Jeong, Dong-Wham ; Shin, Seung-Bok ; Park, Kyoo-Hong ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 385~394
The objective of this study was to estimate social cost on rehabilitation of existing water pipes by investigating the willingness-to-pay (WTP) of residents at INJE County to avoid the loss and inconvenience of transportation and business resulting from the sudden failure and leaks of old water pipes. Contingent valuation method was used through conducting survey to 180 residents in Inche County, with questions of double-bounded dichotomous choice. The resulting WTP of residents at Inche was 7,682 won/month/household. The annual social cost could be estimated as 960 million won, which might be caused by the failure of the old water pipes at INJE County.
Characterization of NOM Behavior and DBPs Formation in Water Treatment Processes
Kim, Sang-Eun ; Gu, Yeun-Hee ; Yu, Myong-Jin ; Chang, Hyun-Seong ; Lee, Su-Won ; Han, Sun-Hee ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 395~407
Disinfection by-products(DBPs) are formed through the reaction between chlorine and natural organic matter(NOM) in water treatment. For reducing the formation of chlorinated DBPs in the drinking water treatment, there is a need to evaluate the behavior of NOM fractions and the occurrence of DBPs for each fraction. Among the six fractions of NOM, the removal of HPOA and HPIN got accomplished through coagulation and sedimentation processes. Advanced water treatment processes were found to be most significant to remove the HPOA and HPON. It was found that HPOA made the most THMFP level than any other fractions and HPIA and HPOA formed higher HAAFP. The fraction of NOM with MW less than 1k Da was 32.5~54.3% in intake raw water. Mostly the organic matter with MW more than 1k Da was removed through coagulation and sedimentation in the drinking water treatment processes. In case of advanced water treatment processes, the organic matter with MW 1k~100k Da decreased by means of ozone oxidation for high molecular weight substances. As the result low molecular organic matter increased. In the BAC and GAC processes, the organic matter with MW less than 100k Da decreased.
Simplification of ASM No. 1 Using Aerobic-Anoxic SBR
Kim, Shin-Geol ; Choi, In-Su ; Koo, Ja-Yong ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 409~420
ASM No. 1 is a very useful model to analyze wastewater treatment system removing organic carbon and nitrogen material. But it isn't adequate to control the wastewater treatment system with real time since it has many material divisions and parameters. So, the purpose of this study is the simplification of ASM No. 1 to control the wastewater treatment system. ASM No. 1 was changed with the model which has 3 material divisions(COD, NH4+, NO3-) and two phases(Aerobic and Anoxic condition). SBR was running with two phases(Phase Ⅰ and Ⅱ). Phase Ⅱ running 20 minutes with aerobic time was used for deciding model parameters and Phase Ⅰ running 12 minutes with aerobic time was used for proving the simplified model. The simplified model was compared with ASM No. 1 using data of Phase Ⅰ and Ⅱ. As a result of model comparison, the simplified model has enough ability to express the variation of NH4+ compound.
A Study on Comparison of the Darcy-Weisbach and Hazen-Williams Equation
Kim, Tae-Kyoungi ; Rhee, Kyoung-Hoon ; Sun, Byoung-Jin ; Chio, Cheong-Ho ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 421~428
Many engineering problems on the pipeline flow use continuity, energy, friction loss head equation. To calculate friction loss head in a pipeline, Darcy-Weisbach and many average velocity equations can be used and Hazen-Williams equation is used frequently in the pipe network for the water supply systems. Darcy-Weisbach equation is a general one acquired from applying Bernoulli's equation in the pipeline flow and Hazen-Williams equation is a experimental one in case that pipe velocity is below 3m/sec and pipe diameter is over 50mm.In this study, comparing Darcy-Weisbach with Hazen-Williams equation, relation f and C that are expressed as roughness coefficients of those equations is explained. Next, head losses calculated from using those equations are compared and those are applied in realistic pipelines. Comparing f with C, the f is decreasing linearly according to increase of the Reynolds number Re and increasing in case the C is decreasing. additionally, the C is increasing up to a point and then is decreasing according to increase of the Re. Next, the C is increasing and Re's range for increase of the C lengthens in case of decreasing of the relative roughness ε/d.Comparing head losses acquired from the two equations, head loss appears large in case that the C is decreasing and the ε/d is increasing. additionally, Head loss calculated by the Darcy-Weisbach equation varies larger than one by Hazen-Williams equation in regard of the Re. Next, change aspect of head loss acquired by the C is distinguished more clearly than the one by the ε/d.
High-Rate Nitrogen Removal using a Submerged Module of Sulfur-Utilizing Denitrification
Moon, Jin-Young ; Hwang, Yong-Woo ; Ga, Mi-Sun ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 429~437
This study aims to develop a sulfur-using denitrification process which is possible a renovation to advanced treatment plant submerging a simple module in activated sludge aeration tank. At first, the impact factor of sulfur-using denitrification was appreciated by the batch test. Secondly, reflecting a dissolved oxygen effect of sulfur-using denitrification that was confirmed by the batch test, in a continuous nitrification/sulfur-using denitrification, high-rate nitrogen removal reaction was induced at optimum condition controlling DO concentration according to phases. Also, inside and outside of sulfur-using denitrification module was covered with microfilter and the module was considered as an alternative of clarifier. Result of batch test for sulfur-using denitrification, NO2--N was lower for consumption of alkalinity and sulfur than that of NO3--N. These results revealed the accordance of theoretical prediction. In continuous nitrification/sulfur-using denitrification experiment, actual wastewater was used as a influent, and influent nitrogen loading rates were increased 0.04, 0.07, 0.11, 0.14 kg N/m3-day by changing hydraulic retention times. At this time, nitrogen loading rates of packed sulfur were increased 0.23, 0.46, 0.69, 0.93 kg N/m3-day. As a result, nitrification efficiency was about 100% and denitrification efficiency was 93, 81, 79, 72%. Accordingly, nitrogen removal was a high-rate. Also the module of sulfur-using denitrification covered with microfilter did not make a fouling phenomena according to increased flux. And the module was achieved effluent suspended solids of below 10 mg/L without a clarifier. In conclusion, it is possible a renovation to advanced treatment plant submerging a simple module packed sulfur in activated sludge aeration tank of traditional facilities. And the plant used the module packed sulfur is expected as a effective facilities of high-rate and the smallest.
Biogas Purifying for Fuel cell Power Plant
Lee, Jong-Gyu ; Jun, Jae-Ho ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 439~444
Using the anaerobic digester gas as a fuel, fuel cells have the potential to provide significant environmental and economic benefits. A molten carbonate fuel cell power plant was installed in the municipal sewage works of Tancheon in Seoul. The fuel cell unit operates on anaerobic digester gas and provides power and heat for the sewage works. This is the first project of its kind in Korea. This article outlines the experiences of gas purification process with planning, installation and operation. The engineering and installation phase is described regarding to the special features of digester gas, for example impurities in gas composition. Such impurities would be harmful to fuel cells. Operational results from the field test with a gas purification process plant were presented in this paper.
Reduced Post-Chlorine Dosage Required for Disinfection: Improvement with Ozonation and GAC Process
Baek, Young-Ae ; Joe, Woo-Hyeun ; Kim, Jong-Moon ; Choi, Young-Jun ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 445~452
This study was carried out to examine effect of post-chlorine dosage reduction by ozonation and GAC process in the field plant for 3years in the "G" water purification plant in Seoul. And it is to compare GAC with BAC process in removal effects of TOC, THMs, THMFP, UV254.As a result, chlorine dosage of ozonation and GAC(=BAC) is less demand than GAC. Seasonal reduction of chlorine demand is from about 37% to 59% with BAC, and from 24 to 46% with GAC. Higher reduction in BAC could be achieved. The efficiency of chlorine demand reduction with ozonation was depending on the organic carbon removal. UV254 concentration is less about 0.13～0.74L/mg.m in BAC than GAC. Therefore, the combination of ozonation and GAC was more effective in reducing post-chlorine than the single GAC. TOC was also monitored, and results show that a linear relationship between TOC and chlorine demand is appropriate under each treatment process. It means that removal of organic matter(TOC) from finished water is necessary to reduce post-chlorine dosage in clear well and to minimize order of chlorine in distribution systems.
The Development and Application of the Performance Indicator for Sewage System Service in Korea
Ahn, Young-Mi ; Kim, Duk-Jin ; Yoon, Hyun-Shik ; Kim, Young-Jo ; Yoo, Man-Sik ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 453~465
With rapid expansion of the water market and growth of water companies, the recent trends in international water industry show that standardization of service activities concerning management of water and wastewater system (ISO/TC 224, to be issued in the second half year of 2007) is expected to have a large influence on the global water market including liberalization of water service market. In the Draft International Standard(DIS) of ISO/TC224, Performance Indicators(PIs) are suggested to estimate the service activities relating to water and wastewater treatment facilities. PIs have been developed in many countries including some international organization(World Bank, IWA and etc.) for service benchmarking. To evaluate public service level and establish plans to improve service level of wastewater utilities, we developed PIs for 120 items and applied them to 10 sewage utilities in the consideration of their scales, circumstances and conditions. In this study, we verified the applicability of the developed performance indicators(PIs). So, we concluded that PIs developed for the purpose of this study can be a useful tool applicable to objective evaluation of the service level of sewage utilities. Using the evaluation tool of PIs developed, it can also be used as a benchmarking tool in this industry as well as for enhancing the efficiency of operation and management of the sewage system. It will also contribute to the water resource management through determination of investment priorities based on the evaluation results and to raising international competitiveness of the domestic sewage utilities to meet the future opening of the water market.
Effects of Temperature on Production of Hydrogen in Anaerobic Fermentation
Kim, Choong-Gon ; Kang, Seon-Hong ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 467~475
This study was conducted to examine temperature effects on hydrogen production in anaerobic fermentation. 18 batch reactors were operated at mesophilic(35˚c) and thermophilic conditions(55˚c) to achieve maximum hydrogen production in anaerobic fermentation. Optimum hydrogen production conditions were also investigated at each temperature. Different trends were observed regarding pH effects on hydrogen production. This effect was not significant for mesophilic fermentation (35℃). In this case, pH may not drop to interfere hydrogen production during the test. However, hydrogen production decreased without pH control for thermophilic condition (55℃). Effects of heat treatment were observed for both fermentation process. Hydrogen production with heat treatment was higher than hydrogen production without heat treatment for both fermentation processes. The amount of produced hydrogen for each substrate concentration with temperature changes showed that more hydrogen was produced at 35˚C than at 55˚C.
Characteristics of Adsorption on the RO Membrane Surface by Coagulants Types
Jeong, Young-Mi ; Park, Chan-Hyuk ; Lee, Sang-Hyup ; Kweon, Ji-Hyang ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 477~483
A coagulation process for RO (reverse osmosis) membrane pretreatment system was an effective technology to remove colloidal and particulate matters. However, coagulant residuals from the pretreatment process may negatively affect RO membrane performance. The bench-scale coagulant exposure study was performed to investigate the effect of their residual on adsorbed mass which related to the membrane performance. Coagulant addition in this study ranged from 0 to 5mg/L ferric chloride, alum, and 2mg/L cationic polymer(poly-di-methyldiallyl ammonium chloride) as coagulant aids. This results showed that adsorbed mass is not significantly increased during short-time period, however, accumulated mass of coagulants on the membrane surface is significantly increased during long-time experimental period. The effect of pH on coagulants adsorption characteristics was significantly differed due to the electrostatic repulsive interactions between soluble coagulants and membrane surface charge. This data suggest that the RO membrane performance of drinking water treatment plant could be decreased by adsorption of residual coagulants when applied for the coagulant pretreatment process.
The Optimal Composing the Filter-Bed for Coping with Daily Flow-Rate Fluctuation for the Performance of Sand Filtration Process
Park, Dong-Hak ; Park, No-Suk ; Kim, Seong-Su ; Bae, Cheol-Ho ; Jung, Nahm-Chung ; Cjoi, Seung-II ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 485~491
Long Term Operation of Microfiltration Membrane Pilot Plant for Drinking Water Treatment
Kim, Chung-H. ; Lee, Byung-G. ; Lim, Jae-L. ; Kim, Seong-S. ; Lee, Kyeong-H. ; Chae, Seon-H. ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 493~501
Removal of High Concentration Manganese in 2-stage Manganese Sand Filtration
Kim, Chung-H. ; Yun, Jong-S. ; Lim, Jae-L. ; Kim, Seong-S. ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 4, 2007, Pages 503~508