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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
Effective Total Nitrogen (TN) Removal in Partially Aerated Biological Aerated Filter (BAF) with Dual Size Sand Media
Kang, Jeong-Hee ; Song, Ji-Hyeon ; Ha, Jeong-Hyub ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 5~14
A pilot-scale biological aerated filter (BAF) was operated with an anaerobic, anoxic and oxic zone at
. The influent sCOD and total nitrogen concentrations in the feedwater were approximately 250 mg/L and 35 mg N/L, respectively. sCOD removal at optimum hydraulic retention time (HRT) of 3 hours with recirculation rates of 100, 200 and 300% in the column was more than 96%. Total nitrogen removal was consistently above 80% for 4 and 6 hours HRT at 300% recirculation. For 3 hours HRT and 300% recirculation, total nitrogen removal was approximately 79%. Based on fitting results, the kinetic parameter values on nitrification and denitrification show that as recirculation rates increased, the rate of ammonia and nitrate transformation increased. The ammonium loading rates for maximum ammonium removed were 0.15 and 0.19 kg
-day for 100% and 200% recirculation, respectively. The experimental results demonstrated that the BAF can be operated at an HRT of 3 hours with 200 - 300% recirculation rates with more than 96 % removal of sCOD and ammonium, and at least 75% removal of total nitrogen.
Effects of polymeric Al and hydrolysis products of PAC at different pH on performance of nanofiltration with PAC coagulation pretreatment
Choi, Yang-Hun ; Kweon, Ji-Hyang ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 15~24
Coagulation can be used for pretreatment of NF membrane filtration. Foulants such as organic matter and particulate can be removed effectively with the process while high flux recovery is maintained. Recently various types of polyaluminium coagulants including polyaluminium chloride(PAC) are commercially available for water treatment. This study examines effects of polymeric Al and hydrolysis products of PAC on nanofiltration membrane performance. Dominant hydrolysis products were polymeric Al,
at acidic, neutral, and alkaline pH conditions, respectively. Under acidic pH condition, flux decline was increased with increasing PAC concentrations, possibly due to polymeric Al adsorption on membrane pore and/or surfaces. For neutral and alkaline pH conditions, little flux decline was observed with increasing PAC concentrations except the highest
concentration, with which rapid flux decline was shown. Removal of ionic matters was also varied with pH conditions in this study. Especially, conductivity removal was substantially low and
concentration in the permeate was quite high at neutral pH condition.
I-O Analysis for the Economic Impact of Water Industry
Choi, Han-Joo ; Park, Doo-Ho ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 25~32
Until now, we recognize that water supply is a public sector rather than business sector in Korea. In spite of the general recognition, water supply sector has an important role within the national economy as an industry. This study try to analyze the current status of water supply sector as a industry with input-output analysis. As we expected, water supply sector is still minor as an industry sector. However, this is not because water supply sector is not important as a industry, but because the price of water too low or free. With regard to the water price impacts, our results show that the 10% increasing water price has only increased 0.01% of the general price level, which is neglectable. To have a competitiveness as a industry, water sector should be reevaluated based on its socioeconomic value. Government policy for water supply sector should achieve two purposes; the one is for as a public service, the other is for the setting new paradigm as an industry.
The System Improvement of the Individual Sewage Treatment System
Jang, Hyo-Ju ; Lee, Jang-Hown ; Kang, Seon-Hong ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 33~40
Individual sewage treatment system is classified into a sewage treatment system which treats all the domestic sewage and a water-purifier tank which treats only effluent flushing from the toilet. The number of registered manufacturers has increased rapidly since 2001. As a result, price competition has increased among the manufacturers and has caused the problems such as the inappropriate production of individual sewage treatment system, the unreasonable permit for building completion and the shortage of the professional technology of the community's public officials in charge. This study collected the problem cases that are related with existing individual sewage treatment system and operation. Efficient improvement plan for the stable supply, installation, maintenance of individual sewage treatment system were suggested.
Optimization of influent and effluent baffle configuration of a rectangular secondary clarifier using CFD and PIV test
Choi, Young-Gyun ; Bae, Kang-Hyung ; Yoon, Jong-Hwan ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 41~50
The influent and effluent baffle configurations seriously affect the hydraulic characteristics of the secondary clarifier in wastewater treatment plant. In this study, those baffle configurations were optimized by computational fluid dynamics(CFD) analysis and particle image velocity(PIV) test in order to obtain uniform flow in inlet region and to minimize upflow velocity in outlet region of the secondary clarifier. Theoretical analysis using CFD showed that more uniform flow could be accomplished when the influent baffle was located closely to the inlet opening. Effects of effluent baffle configuration on the upflow velocity in the outlet region of the secondary clarifier were analyzed with four types of effluent baffles which are widely adopted for secondary clarifier design. From the CFD analysis, McKinney baffle(EB-2) was estimated to be the most effective for restraining the upflow velocity in the outlet region and these trends were identified by PIV tests. In addition, the McKinney baffle showed the most uniform overflow velocity distribution around the weir.
Effects of Environmental Factors on Nitrite Accumulation in a Strong Nitrogen Removal System
Park, Noh-Back ; Choi, Woo-Yung ; Yoon, Ae-Hwa ; Jun, Hang-Bae ; Park, Sang-Min ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 51~62
The high concentration of N in the wastewater from livestock farming generally renders the efficiency of the wastewater treatment. Therefore, removal of N in livestock wastewater is crucial for successful treatment. The current study was conducted to investigate the optimum conditions for partial nitrification under anaerobic condition following nitritation in TPAD-BNR(two-phase anaerobic digestion-biological nitrogen removal) operating system. Sequential operating test to stimulate partial nitrification in reactor showed that partial nitrification occurred at a ratio of 1.24 in
-N. With this result, a wide range of factors affecting stable nitritation were examined through regression analysis. In the livestock wastewater treatment procedure, the hydraulic retention time (HRT) and pH range for optimum nitrite accumulation in the reactor were 1-1.5 days and 7-8, respectively. It was appeared that accumulation of
-N in the reactor is due to inhibition of the
-N oxidizer by free ammonia (FA) while the effect of free nitrous acid was minimal. Nitrification was not influenced by DO concentration at a range of 2.0-3.0 mg/L and the difference in the growth rate between
-N oxidizer and
-N oxidizer was dependent on the temperature in the reactor.
Application of the cooperative two-person nonzero-sum game for water resources development in the Tumen river basin
Park, Wan-Soo ; Lee, Sang-Eun ; Park, Hee-Kyung ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 63~72
This study aims to make a decision about the rational option for a multipurpose dams development of the Tumen river basin so that the adjoining countries will effectively deal with the chronic problems and fully satisfy the fast growing demand of water and power. It has been thus far investigated that the interests between North Korea and China closely depend on the selected option, and they are not well compatible with each other. These situations are defined in terms of the cooperative two-person nonzero-sum game. The Nash bargaining model is then applied to contemplate the rational option, considering two scenarios of economic growth of the North Korea. After analyzing the model, it was expected that 1) two multipurpose dams must be cooperatively developed, and 2) their benefits should be allocated according to demand of each country. The authors finally suggest that a cooperative organisation be established to effectively manage the dams beyond the border of the countries.
A Study by Proposal of Efficiency Increase for a Full-scale Wastewater Reclamation Facility using a Biofilter Packed with Granular Sulfur
Moon, Jin-Young ; Hwang, Yong-Woo ; Baek, Seung-Ryun ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 73~83
This study was performed to increase the removal efficiency of the biofilter packed with granular sulfur in municipal wastewater reclamation facility. Constituent units were influent water tank, denitrification tank, BOD reduction tank and outlet. And, the major operation factor is a biofilter packed with submerged granular sulfur. Actual wastewater and synthetic wastewater were used as influent wastewater. Experimental condition was divided into two phases according to the amount of a phosphorus coagulant. Total phosphorus removal efficiency was insignificant at mode I that phosphorus coagulant was not injected. The average influent and effluent total phosphorus concentrations at mode II were 0.5 ~ 1.0 mg/L and 0.27 mg/L, respectively. As for COD and BOD effluent concentrations, COD was 3.0 mg/L and BOD was 1.0 mg/L. Additionally, nitrogen removal rates were high at low influent DO concentration. In conclusion, a new process, biofilter packed with granular sulfur is expected to treat high-rate nitrogen wastewater and expected to be utilized as an alternative of technological innovation for the nitrogen treatment.
Application of Non-Thermal Plasma for the Simultaneous Removal of Odor and Sludge
Hwang, Hyun-Jung ; Ann, Hae-Young ; Shin, Seung-Kyu ; Song, Ji-Hyeon ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 85~92
In this study, odorous compounds emitted from various wastewater treatment were treated with using the non-thermal plasma reaction, and the effluent gas from the plasma reactor was introduced to a waste sludge reactor to achieve simultaneous sludge reduction. Hydrogen sulfide, the model odorous compound, was removed at 70% using the plasma reaction, and greater than 99% removal efficiency was observed when treated by the sludge reactor. In addition, the sludge reactor showed a high efficiency of ozone removal. As ozone reacted with sludge, oxidation with organic matters took place, and total COD decreased by 50~60% and soluble COD increased gradually. As a result, the integrated process consisting of the non-thermal plasma and the sludge reactor can be successfully applied for the simultaneous treatment of malodorous gas and waste sludge.
Scale Removal by Chemical Cleaning in Reverse Osmosis Membrane Process
DockKo, Seok ; Lee, Hyung-Jib ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 93~101
Reverse osmosis (RO) membranes have been widely used for desalination as well as water and wastewater treatment facilities. Cleaning process is important to maintain stable operation as well as prevention of membrane fouling. Purpose of this research is to analyze electrostatistic and chemical characteristics after cleaning of RO membrane against
scale. Four RO membranes of polyamide are used and examined about effect of chemical cleaning. EDTA (ethylene diamine tetraacetic acid) and SDS (sodium dodecil sulfate) and NaOH are applied for cleaning process after operation in synthetic water. Then, cleaning was performed with chemicals such concentration as 6hr, 12hr and 24hr, respectively. As a result, transmittances of FT-IR of four membranes are compared at each cleaning concentration. Ta/Tv shows difference of chemical composition between new membrane and cleaning membrane after cleaning. Type B of RO membrane is turned out to be most vulnerable to cleaning among four membranes. In terms of zeta potential, new membrane has -16 mV to +6 mV on pH while scaled membrane has -18 mV to 2 mV. However, it changed -23mV to 0.9 mV after cleaning. In comparison with existing salt rejection of RO membranes after cleaning, the rejection of the membranes goes down 0.7% maximum. Though cleaning changes the characteristics of membrane surface, it does not greatly affect salt rejection. pH is a critical factor to flux change in PA (polyamide) membrane.
Relationship between Physical Property of Re-agglomerated Floc and Turbulent flow
Park, No-Suk ; Kim, Seong-Su ; Kim, Kwan-Youp ; Kim, Jong-Oh ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 103~108
Until now, research reports that it is difficult for brokenup floc after coagulation to reaggregate and settling efficiency of reaggregated floc is relatively low have dominated in water treatment process. In contrast, from recent study conducted by the French researcher, because the density of the reaggregated floc was higher than the previous floc, the settling efficiency of reaggregated floc increased. In this study, 15 times wet test were carried out and the removal efficiency of reagrregated floc was considerably increased. Moreover, this result was explained using the turbulent model for the flow occurred around the floc. Consequently, in the case of suitable hydrodynamic condition for the reaggregation, the characteristics of the reaggregated floc was changed into the favorable condition for improvement of settling efficiency. Also, the most important factor for reaggregation of floc was governed by hydrodynamic shear stress.
A Study on the degradation of Lindane in water by a Photo-Fenton process and a UV/
Lee, Ju-Hyun ; Choi, Hye-Min ; Kim, Il-Kyu ;
Journal of Korean Society of Water and Wastewater, volume 24, issue 1, 2010, Pages 109~117
In the present study, the degradation characteristics of Lindane by Advanced Oxidation Processes(UV/
, Photo-Fenton process) were studied. The degradation efficiency of Lindane in aqueous solution was investigated at various initial pH values, Fenton's reagent concentrations and initial concentrations of Lindane. GC-ECD was used to analyze lindane. Lindane has not been degraded without application of AOPs over two hours. But, approximately 5% of lindane was degraded with UV or
alone. Lindane with UV/
process showed approximately 7% higher removal efficiency than
process. In the UV/
process, the pH values did not affect the removal efficiency. The optimal mole ratio of
for lindane degradation is about 1.0 in Photo-Fenton process. Also, the experimental results showed that lindane removal efficiency increased with the decrease of initial concentration of lindane. Under the same conditions, the order lindane of removal efficiency is as following : Photo-Fenton process > UV/
process. In addition, intermediate products were identified by GC-MS techniques. Than PCCH(Pentachlorocyclohexene) was identified as a reaction intermediate of the Photo-Fenton process.