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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
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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
Selecting the target year
Characteristics of Natural Organic Matter (NOM) on Han River and Criterion of Enhanced Coagulation
Jeong, Young-Mi ; Kweon, Ji-Hyang ; Lee, Sang-Hyup ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 653~661
The Disinfectants/Disinfection By-products(D/DBP) Rule proposed by the US Environmental Protection Agency requires the implementation of enhanced coagulation as a control strategy for natural organic matter(NOM) removal and as a means of limiting the formation of all DBPs, i.e., not just the trihalomethanes and haloacetica acids. To control DBP formation, several best available technologies(BATs) were determined for removal of DBPs and DBP precursors. The enhanced coagulation is one of the BATs for DBP precursors removal. Treatment facilities that achieve a specified percent removal of total organic carbon(TOC) prior to the application of a continuous disinfectant or that achieve a residual TOC concentration < 2 mg/L prior to the application of a continuous disinfectant are considered to be in compliance with enhanced coagulation. The enhanced coagulation was applied to raw water in Korea, the Han River. Raw water were examined and effects of different raw water qualities on enhanced coagulation were investigated. Three analyses were used for raw water characteristics, water quality measurement, molecular weight distributions, hydrophobic/hydrophilic fractionation. The Han River had the relatively low alkalinity and low organic carbon concentration. The results of molecular weight distributions showed significant portions of low molecular weight organics, which is very different from most water in USA. The alum doses for the required TOC removal guided from USEPA manual were quite low(i.e. 10~30 mg/L alum) for the water, probably due to the specific water quality of the Han River.
A Study on the Dye Wastewater Treatment Using
Kim, Chang-Kyun ; Chung, Ho-Jin ; Kim, Jong-Suk ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 663~670
This study was performed to provide basic information for evaluating the efficiency and applicable extent of photocatalysis and ozonation for the treatment of dye wastewater. The treatability of dye wastewater by UV/TiO2 and UV/TiO2/O3 advanced oxidation process(AOP) was investigated under various conditions. The experiments were conducted in a batch reactor of 50 liters equipped with twelve UV Lamps of 16W. In UV/TiO2 AOP, the removal efficiency of TCODMn and Color increased to 58% and 67% respectively with increasing UV intensity. Also, The removal efficiency of TCODMn and Color increased to 97% and 99% respectively with increasing H2O2. Acid area was more efficient than neutral and alkalic areas in wastewater treatment, and pH 5 was the most effective and the treatment efficiency continually increased as the amount of photocatalyst was increased. When the photocatalyst was increased, TCODMn was removed faster than Color.
Effect of Molecular Weight of NOM for Adsorption of 2-MIB on Virgin and Reactivated GAC
Kim, Sung-Jin ; Hong, Seong-Ho ; Choi, Ju-Sol ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 671~678
2-methylisoborneol(MIB) is a musty odor compound produced as a secondary metabolite by some cyanobacteria and actinomycetes. It is lead to distrust in tap water due to taste and odor. It is well known that activated carbon(AC) adsorption is the best available technology to remove 2-MIB and geosmin. In this study, physical characteristics of virgin AC and reactivated AC was compared. The effect of variation of NOM molecular weight on adsorption of 2-MIB in virgin AC and reactivated AC were also evaluated. BET surface area was decreased by 13 to 23% and total pore volume was decreased by 18 to 21% due to first and second reactivation compare to the virgin carbon. However, mesopore volume(Vmeso) was increased about 14% after reactivation. It showed that micropore volume was decreased and move to mesopore or macropore after reactivation. Decreased adsorption capacity of 2-MIB was greatly related to below 3000Da. Adsorption capacity of 2-MIB was rather greater in virgin AC than in reactivated, which is strongly related to micropore volume.
Reduction of Nitrate using Nanoscale Zero-Valent Iron Supported on the Ion-Exchange Resin
Park, Hee-Su ; Park, Yong-Min ; Jo, Yun-Seong ; Oh, Soo-Kyeong ; Kang, Sang-Yoon ; Yoo, Kyoung-Min ; Lee, Seong-Jae ; Choi, Yong-Su ; Lee, Sang-Hyup ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 679~687
Nanoscale zero valent ion (nZVI) technology is emerging as an innovative method to treat contaminated groundwater. The activity of nZVI is very high due to their high specific surface area, and supporting this material can help to preserve its chemical nature by inhibiting oxidation. In this study, nZVI particles were attached to granular ion-exchange resin through borohydride reduction of ferrous ions, and chemical reduction of nitrate by this material was investigated as a potential technology to remove nitrate from groundwater. The pore structure and physical characteristics were measured and the change by the adsorption of nZVI was discussed. Batch tests were conducted to characterize the activity of the supported nZVI and the results indicated that the degradation of nitrate appeared to be a pseudo first-order reaction with the observed reaction rate constant of 0.425 h-1 without pH control. The reduction process continued but at a much lower rate with a rate constant of 0.044 h-1, which is likely limited by mass transfer. To assess the effects of other ions commonly found in groundwater, the same experiments were conducted in simulated groundwater with the same level of nitrate. In simulated groundwater, the rate constant was 0.078 h-1 and it also reduced to 0.0021 h-1 in later phase. The major limitation in application of ZVI for nitrate reduction is ammonium production. By using a support material with ion exchange capacity, the problem of ammonium release can be solved. The ammonium was not detected in the batch test, even when other competitive ions such as calcium and potassium existed.
Characteristics of Pit Corrosion and Estimation Models of Corrosion Depth in Buried Water Pipes
Kim, Jea-Hag ; Ryu, Tae-Sang ; Kim, Ju-Hawn ; Ha, Sung-Ryung ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 689~699
The accurate estimation of water pipe deterioration is indispensable to prevent pipe breakage and manage in advance. In this study, corrosion of water pipe is adopted, which is relatively underestimated although it takes most part of deteriorating pipeline. Predicting corrosion rate and corrosion depth of a pipe can make an increase the life span of the pipeline, which is laid under the ground according to characteristics of soil and water corrosion. For the purpose, mathematical models that can presume nominal depth through estimation of pit corrosion and corrosion rate is introduced. As comparison of results with conventional methods in other foreign countries, it is evaluated that the external corrosion depth is estimated less than the models, proposed by other researchers and the internal corrosion rate was processed faster than the external corrosion rate.
Forecast of Influent Characteristics in Wastewater Treatment Plant with Time Series Model
Kim, Byung-Goon ; Moon, Yong-Taik ; Kim, Hong-Suck ; Kim, Jong-Rack ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 701~707
The information on the incoming load to wastewater treatment plants is not often available to apply to evaluate effects of control actions on the field plant. In this study, a time series model was developed to forecast influent flow rate, BOD, COD, SS, TN and TP concentrations using field operating data. The developed time series model could predicted 1 day ahead forecasting results accurately. The coefficient of determination between measured data and 1 day ahead forecasting results has a range from 0.8898 to 0.9971. So, the corelation is relatively high.We made forecasting program based on the time series model developed and hope that the program will assist the operators in the stable operation in wastewater treatment plants.
Dewatering Characteristic of Water Treatment Plant Sludges based on Detention Time
Moon, Yong-Taik ; Kim, Byung-Goon ; Kim, Youn-Kwon ; Kim, Hong-Suck ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 709~715
The dewaterability of a sludge can be characterized by two ways : the residual moisture content in the sludge cake after dewatering process, and the filtration of the sludge. Time to filter (TTF) represents filtration processes that are special cases of the flow through a solid matrix concept. TTF characterizes a resistance to filtration. The sludge resistance, in turn, can be subdivided into resistances associated with the solid phase and the liquid phase to evaluate the effect of each of the two phases on sludge dewaterability. In order to determine the dewatering characteristics of the water sludge samples, TTF and zeta potential were measured. For these studies cationic polymer was chosen for water sludge dewatering experiments. The zeta potential of thickener sludges neared from minus values to zero values till 4 days after sampling. The dewaterability of thickener sludges using cationic polymer was deteriorated according to the increase of detention time. As the detention time was increased from 4 to 10 days, the optimal dose of the polymer was increased from 4 to 8 ㎎/ℓ. Therefore, the optimal detention time plays an important part for the dewaterability of a sludge.
Reduction of Cake Resistance by Floc Reaggregation in a Membrane-Feed-Pipe
Kim, Tae-Young ; Park, Hee-Kyung ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 717~726
Fully-grown flocs in a mixing tank of membrane filtration with dead-end membrane are ruptured while passing through a pump and the ruptured flocs are aggregated again in a Membrane-Feed-Pipe (MFP). To look at more details, this study tries to relate the reaggregation to a parameter of mixing intensity in MFP, i.e., G-value. The G-value is a function of Reynolds number, pipe diameter, friction factor and average velocity in MFP. To deal with polydispersity condition, we develop a representative particle size called in this study EDPD (Effective Diameter for Polydispersity condition in Dead-end filtration). The experimental results show that as the G-value increases, the EDPD decreases and also the cake resistance increases. Through comparison between EDPD and cake resistance, these results show that cake resistances are controlled by reaggregation phenomenon in MFP. The effect of detention time in MFP, however, does not affect the reaggregation of the broken flocs as G-values are increased
A Study on Removal of Organism and Nitrogen, Phosphorus in Wastewater Treatment Process Using Nitrifier Activated Reactor
Dong, Young-Tak ; Seo, Dong-Whan ; Bae, Yu-Jin ; Park, Ju-Seok ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 727~735
A Study on the Sludge-reduced Sewage Treatment Process Combined with Sludge Solubilization Technique Using Alkalophiles
Shin, Kyung-Sook ; Kim, Yoon-Seok ; Han, Dae-Hoon ; Han, Woon-Woo ; Rhee, Young-Ha ; Hur, Hyung-Woo ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 737~744
Recently, one of the most interesting topic in the field of wastewater treatment is the disposal of excess sludge. The new concept of excess sludge reduction with recirculation of solubilized sludge via effective microorganisms for cell disruption within the wastewater treatment process has been developed in this study. The alkalophiles for degradation of sludge cell wall was isolated as Exiguobacterium sp., which could be more effectively solubilized sludge in the anaerobic condition. The SCOD of solubilized excess sludge by Exiguobacterium sp. was up to about 2,000mg/L and average TN and TP concentration of solubilized component were 117mg/L and 58mg/L, respectively and C/N ratio was more than 17. To investigate the effects of solubilized sludge by alkalophiles on excess sludge reduction and nutrient removal efficiency, the pilot plant of DFⓢ-MBR process, combined with membrane bioreactor and sludge solubilization tank, was operated. In the control run(without sludge solubilization), the daily sludge production was about 4.54 kgMLVSS/day. However, in the DFⓢ-MBR(with sludge solubilization), the daily sludge production was decreased to 1.39kgMLVSS/day. The effluent quality satisfied the effluent regulation in both cases. Furthermore, the DFⓢ-MBR showed relatively better TN removal efficiency in spite of high influent loading. So we concluded that the solubilized excess sludge by alkalophiles was effectively degraded in the MBR process as the carbon source and 70% of sludge reduction efficiency can be achieved.
Estimation of the Optimum Factor of the Struvite Crystalization for the Nitrogen and Phosphorus Removal in WWTP
Kim, Ji-Yeon ; Moon, Yong-Taik ; Seo, In-Seok ; Kim, Byung-Goon ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 745~753
By struvite and hydroxyapatite crystallization, was high concentration of nitrogen and phosphorus in wastewater simultaneously. Particularly, removal of nitrogen and phosphate for crystallization have been applied to landfill leachates and animal wastewater. The purpose of this study is to decide the optimum struvite crystallization factors, sequence of Mg2+ addition, pH control and Mg2+, PO43- molar ratio.In conclusion, dosage of the magnesium followed by pH control formed magnesium hydroxide, so pH was decreased. Therefore, pH control after magnesium dosage was necessary. If after pH adjustment, magnesium puts in, pH 11 was necessary. Over pH 10, it was not good for struvite crystallization efficiency by side reaction. Following of the Mg2+ and the PO43- are dosed excessively, the removal efficiency of the NH4+ increased. A molar ratio of Mg2+:NH4+:PO43-, 1.3:1:1.3 was the most on effective for NH4+ removal at pH 9.5. But for the perfect removal NH4+, it is thought to be that molar ratio should be 2:1:2.
Numerical Analysis for Characteristics of Flow Fields and Disinfection Performances in the Clearwell with a Porous media Wall
Lee, Suk-Won ; Rhee, Gwang-Hoon ; Koo, Ja-Yong ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 755~761
Disinfection performance in clearwell is generally measured by CT, which is expressed by CT. C is represented by disinfection concentration, and T is represented by T10 which means 90% contact time in clearwell. In order to improve Disinfection performance, augmentation of T10 is required. Guide wall has been generally used to improve T10 because T10 changes according to flow field. In this study, porous media is proposed instead of guide wall, and disinfection performance between guide wall and porous media wall are compared. Flow field and T10 in each clearwell are investigated as well. Improved Disinfection performance appear in case of porous media wall compare to guide wall, and best performance occur in porosity factor b 1e+4.
The Effects of Anthracite Media Sphericity on Filtration Efficiency
Cheong, Won-Suk ; Choi, Suing-Il ;
Journal of Korean Society of Water and Wastewater, volume 21, issue 6, 2007, Pages 763~770
There are many design parameters affecting filtration efficiency such as filteration rate, media packing depth, size distribution, and so on. The sphericity, the ratio of the surface area of an equal volume sphere to the real surface area of the particles, is one of major physical characters of media. The effect of sphericity on the performance of anthracite filter has been investigated. Media from eight water treatment plants have been collected. The sphericity of each media has been calculated by using well known headloss equations such as Kozeny equation, Dahmarajah equation etc.. Columns packed with anthracite media having different sphericity have been used to compare headloss development, floc accumulation in the bed, particles in bed water, filtrate turbidities after backwash and so on. The repeated experiments have indicated that the sphericity of anthracite media may not have remarkable influence on the filter performance as it has been suspected. It also has been prospected in the experiment that the media of higher sphericity would store more particles in the bed and give better filtrate quality, if provided that the effective size and the size distribution of media would be the same