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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society on Water Environment
Journal Basic Information
Journal DOI :
Korean Society on Water Quality
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Volume & Issues
Volume 30, Issue 6 - Nov 2014
Volume 30, Issue 5 - Sep 2014
Volume 30, Issue 4 - Jul 2014
Volume 30, Issue 3 - May 2014
Volume 30, Issue 2 - Mar 2014
Volume 30, Issue 1 - Jan 2014
Selecting the target year
The Removal Efficiency of Microcystis spp. and Its Ecotoxicity Using Clay
Park, Hye-Jin ; Kim, Sang-Hoon ; Park, Woo-Sang ; Lee, Jae-Yoon ; Lee, Jae-An ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 261~268
DOI : 10.15681/KSWE.2014.30.3.261
Four clays (both natural and commercial types) mainly used in Korea were tested for removal efficiency of Microcystis spp. and ecotoxicity on Daphnia magna and Vibrio fischeri. Four clays (clay A~D) were composed of 91.9~100% of sand (0.02~0.2 mm in particle size). Clay D consisted of lager particles than other clays. Major elements of the four clays were
(5.4~7.9%). They contained kaolinite (clay mineral), quartz, muscovite, and so on. Clay C and D contained montmorillonite, one of the clay minerals improving clay-cell aggregation. For clay A, B and C, removal efficiency of Microcystis spp. was over 60% at 2 g/L. It reached about 100% at over 5 g/L. For clay D, it was over 60% and 95~100% at 5 g/L and 20 g/L respectively. After adding clays, pH decreased. The greatest drop of pH appeared at clay C. Except for addition of 100 g/L clay C, ecotoxicity on D. magna and V. fischeri didn't appeared at all dose of clays.
A Study on Performance Estimation and Operation Strategy of Biological Aerated Filter Using Semi-Empirical Biofilm Model
Yoo, Kwangtae ; Kim, Jongrack ; Yun, Zuwhan ; Hwang, Hojae ; Lee, Hansaem ; Kim, Sungpyo ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 269~282
DOI : 10.15681/KSWE.2014.30.3.269
The objective of this study is to find out whether the developed semi-empirical biofilm model can be applicable to real BAF pilot-scale wastewater treatment. In addition, the optimum operating conditions of BAF as a function of process variables such as organic loading change can be drawn based on the simulation results of model. The results will provide the economic and efficient BAF process design and operating control. As a result, developed semi-empirical biofilm model which is relatively simple compared to mathematical model can simulate three BAF processes consisted of 25 layers within 1 seconds. When this model was used for simulating real pilot scale BAF process and the simulated water quality values were compared to experimental ones, simulated TCOD, SCOD, TN,
-N, alkalinity values were different to experimental ones within 21%, 20%, 8.1%, 48%, 10%, and 23%, respectively. Therefore, if the BAF system was equipped with automatic control, the BAF process can be better efficiently adapted under the condition of significant change of influent loading.
Distribution of Epilithic Diatom Communities in Relation to Land-Use and Water Quality in the Geum River System, South Korea
Cho, In-Hwan ; Hwang, Soon-Jin ; Kim, Baik-Ho ; Kim, Yong-Jae ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 283~291
DOI : 10.15681/KSWE.2014.30.3.283
To study the distribution characteristics of diatom communities in relation to the gradient of water quality and land-use, water samples and epilithic diatoms were collected from 90 sites including mainstream and tributaries, in the Geum River System (GRS) during no rainfall, May 2011. Of 239 taxa identified, Achnanthes convergens and Cymbella minuta were dominated over all the sites. Cluster analysis on the GRS divided into three groups. Group 1 (G1) is the mountainous upstream, a relatively good water quality, and mainly consisted of saproxenous species. Group 2 (G2) is the urban sites, polluted (high in electric conductivity, total phosphate and soluble reactive phosphorus), and saproxenous and common species. Group 3 (G3) is the agriculture sites, and polluted (turbidity, total nitrogen, nitrate), and saprophilous species. There were some discrepancies between abiotic and biotic variables in GRS; biologically similar between G1 and G2, but abiotically similar between G2 and G3. These differences may attribute to not only physiological characteristics of diatom cells, but complicate relationships between microhabitat and water quality. Thus, an urgent development of generalized or standardized methods to diminish the differences between epilithic diatom community and environments is advent.
Cyanide Degradation from Plating Wastewater Using Iron Oxide Nanocomposite Layer
Jang, Jun-Won ; Kim, Hye-Ran ; Lim, Hyeong-Seok ; Park, Jae-Woo ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 292~297
DOI : 10.15681/KSWE.2014.30.3.292
We synthesized the self-organized nanoporous oxide with potentiostatic anodization of iron foil. The iron oxide nanocomposite (INCs) were fabricated in 1M
containing 0.5wt% NaF electrolyte holding the potential at 20, 40 and 60 V for 20min, respectively. Field Emmision Scanning Electron Microscopy (FESEM) and X-ray Diffractometer (XRD) were used to evaluate the micromorphology and crystalline structure of INC film. Also, this study was performed to evaluate the fenton reaction using INC film with hydroperoxide for degradation of cyanide dissolved in water. In case of INC-40V in the presence of
3%, the first-order rate constant was found to be
, and indicated to be
on commercial hematite powder. This result is shown to be good performance enough to replace the powder type for treatment of wastewater.
The Determination of TRC using an Electrochemical Method (I: Au electrode)
Lee, JunCheol ; Pak, DaeWon ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 298~303
DOI : 10.15681/KSWE.2014.30.3.298
We measured by electrochemical method for TRC (total residual chlorine) in ocean. From the results of Au electrode used for working electrode through cyclic voltammetry test, we obtained charge in voltage ranged from 0.0V-1.0V, and analyzed correlations of charge for TRC. Reduction peak TRC was investigated to be approximately 0.65 V vs. Ag/AgCl, and in the case that salt concentrations and temperatures in ocean appeared different, charge was analyzed for being different in the same TRC. However, in the case that each condition was constant, charge was measured at highly correlations for TRC.
The Determination of TRC using an Electrochemical Method (II: Pt electrode)
Lee, JunCheol ; Pak, DaeWon ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 304~310
DOI : 10.15681/KSWE.2014.30.3.304
The conventional methods for total residual chlorine such as iodometry and DPD colorimetric can cause secondary pollution due to additional agents, also have a wide error range. As for alternative, electrochemical method can measure TRC(Total residual chlorine), and is not required as additional agents, also very suitable for using the fields of ballast water because test time is relatively fast. Therefore, this study was investigated for changing charge by agitation, salt concentration, and temperature change. Charge showed differences based on changes of reduction peak with or without agitation. In contrast, TRC and charge were well correlated in constant agitation speed. As TRC and charge were analyzed with high correlations in constant salinity and temperature of ocean, thereby conductivity was firstly measured, and charge had high correlation for TRC in spite of changing salinity and temperature Pt electrode revealed high reliability (
) because it was rarely effected by TRC, On the other hand, Au electrode appeared inadequate (
) to use sensor in less than 1.0 ppm of TRC. For high accuracy and detection of TRC, Pt and Au electrodes for test time were, respectively, 14 and 22 seconds. As a result, Pt electrode was more valuable than Au electrode in terms of response time.
Variation of Sedimentation & Dewaterability Characteristics of Sewage Sludge under Various Coagulants
Baik, Seon Jai ; Jo, Jung Min ; Song, Hyun Woo ; Han, Ihn Sup ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 311~318
DOI : 10.15681/KSWE.2014.30.3.311
The purpose of this study is to investigate the effect of various types of coagulant on dewaterability and settleability of sewage sludge for the application of dewatering process. Cationic organic coagulants and inorganic coagulants of the aluminium base were used; PAC (Poly Aluminium chloride,
17%) and C-210P (0.2%). After Jar test, PAC 26 mg/L and 0.2% C-210P 55 mg/L was decided as the optimum concentration of the coagulant according to zeta potential measurement. pH, alkalinity and viscosity were measured in all experiments and the data on sedimentation characteristics is analyzed by SDI, SVI sedimentation rate and solid flux. The SRF(Specific Resistance of Filtration) experiment was conducted with the result of single and dual injection system as the dewaterability experiment. As a result, the organic coagulant making large floc has good characteristics of sedimentation and agglutination. Also, it is observed that the organic coagulants injection has a better dewaterability efficiency of coagulants under the condition of the lowest SRF value, followed by dual and inorganic coagulants injection.
Spatial Distribution and Geomorphological Characteristics of Headwater Stream (Dorang) Catchments in Geum River Basin
Kim, Haejung ; Cho, Hong-Lae ; Koo, Bhon Kyoung ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 319~328
DOI : 10.15681/KSWE.2014.30.3.319
Dorang - the Korean term for headwater streams - occupy a large portion of the total stream length in a basin, and contribute significantly towards the quantitative and qualitative characteristics, and the ecosystem, of the main river. The Ministry of Environment of South Korea has supported the investigation of the status of Dorang in the nation's four major basins, since 2007. Without a widely accepted academic or legal definition of Dorang, however, there are limits to understand the distribution of Dorang at the national scale and to systematically compile a Dorang database. This paper, through a review of the stream classification system and Korean legal system delineating streams, defines Dorang as 1st and 2nd order streams according to the Strahler ordering method, in a 1:25,000 geographical scale. Analysis of the Geum River basin, with this definition, reveals that the total length of Dorang is 20,622.4 km (73.6% of total stream length), and the number of Dorang catchments is 23,639 (71.3% of the basin area). Further analysis of the geomorphological characteristics of Dorang catchments shows that the average total stream length is 1.1 km, average catchment length is 1.2 km, average drainage area is
, and average drainage density is 3.08/km.
Estimating Chlorophyll-a Concentration using Spectral Mixture Analysis from RapidEye Imagery in Nak-dong River Basin
Lee, Hyuk ; Nam, Gibeom ; Kang, Taegu ; Yoon, Seungjoon ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 329~339
DOI : 10.15681/KSWE.2014.30.3.329
This study aims to estimate chlorophyll-a concentration in rivers using multi-spectral RapidEye imagery and Spectral Mixture Analysis (SMA) and assess the applicability of SMA for multi-temporal imagery analysis. Comparison between images (acquired on Oct. and Nov., 2013) predicted and ground reference chlorophyll-a concentration showed significant performance statistically with determination coefficients of 0.49 and 0.51, respectively. Two band (Red-RE) model for the October and November 2013 RapidEye images showed low performance with coefficient of determinations (
) of 0.26 and 0.16, respectively. Also Three band (Red-RE-NIR) model showed different performance with
of 0.016 and 0.304, respectively. SMA derived Chlorophyll-a concentrations showed relatively higher accuracy than band ratio models based values. SMA was the most appropriate method to calculate Chlorophyll-a concentration using images which were acquired on period of low Chlorophyll-a concentrations. The results of SMA for multi-temporal imagery showed low performance because of the spatio-temporal variation of each end members. This approach provides the potential of providing a cost effective method of monitoring river water quality and management using multi-spectral imagery. In addition, the calculated Chlorophyll-a concentrations using multi-spectral RapidEye imagery can be applied to water quality modeling, enhancing the predicting accuracy.
A Study on a GIS based Updating Methodology of Landcover Maps for the Enhancement of Utilization in the Total Maximum Daily Loads
Kwak, Geun Ho ; Kim, Kye Hyun ; Lee, Chol Young ; Oh, Seong Kwang ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 340~350
DOI : 10.15681/KSWE.2014.30.3.340
Recently, TMDL has been implemented to estimate the amount of pollutant loads and to establish proper mitigation strategy to decrease the pollutant loads by the Ministry of Environment. To estimate the amount of pollutant loads with reasonable accuracy, securing landcover map with periodically updating is essential. However, in reality, due to the technical and financial difficulties, the landcover map has not been updated annually. Hence, this study mainly aims to suggest an effective GIS-based updating method in order to promote utilization of landcover map in the estimation of pollutant loads. Bupyeong-gu at the City of Incheon with the total area of
was chosen for this study and spatial data including digital topographic maps, ortho aerial photo, and satellite images were collected and utilized. A total of 7,235 feature entities were newly produced through the updating process of five steps and it was revealed that the classification of landcover with the total area of
was to be changed. The validity and feasibility of the suggested method were proved with the accuracy of 97.9% from the field verification. Further study needs to be made for devising more automated method to update landcover map to facilitate TMDL for individual local governments.
Application of Margin of Safety Considering Regional Characteristics for the Management of Total Maximum Daily Loads
Park, Jun Dae ; Oh, Seung Young ; Kim, Yong Seok ;
Journal of Korean Society on Water Environment, volume 30, issue 3, 2014, Pages 351~360
DOI : 10.15681/KSWE.2014.30.3.351
The allocation of margin of safety (MOS) at a uniform rate to all areas of the unit watershed makes it very difficult to keep the load allotment stable in the area for lack of reduction measures like forest land. This study developed an equation to calculate margin of safety differentially according to the regional characteristics. The equation was formulated on the basis of the regional characteristic factors such as a load contribution factor for land use type and a site conversion factor for the unit watershed. The load contribution factor represents a contribution of loads from a particular land use. The site conversion factor was derived from the site conversion ratio of a unit watershed. Margin of safety for the non-point pollution load in the land use sector decreased by 20~25% in three river basins. The margin of safety in the unit watersheds with low site occupation ratios decreased in high rate, while in the unit watersheds with large urban area decreased in low rate. With the application of the differential margin of safety considering regional characteristics, not only the reduction of pollution loads can become lighter but also it can be easier to develop plans for Total Maximum Daily Loads (TMDLs) even where the reduction measures are not available.