• Title/Summary/Keyword: Water quality comparison

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Study on the unification between KS I ISO standard and official test method enacted by Korean Ministry of Environment - drinking water and indoor air quality - (환경오염공정시험기준과 KS ISO규격의 일원화에 관한 연구 - 먹는 물 및 실내공기질 -)

  • Lee, Jeong-Il;Lee, Ju-Hee;Lee, Jeong-Hee;Lee, Jun-Hee;Lee, Won-Seok;Kim, Ji-In;Kim, Bo-Kyung;Choi, Sung-Hun
    • Analytical Science and Technology
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    • v.25 no.2
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    • pp.102-113
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    • 2012
  • Our study researched on unification of KS I ISO standard harmonized with ISO and Official Test Method enacted by Korean Ministry of Environment-drinking water and indoor air quality. We reviewed KS methods related to drinking water and indoor air quality for about 23,000 KS methods. KS methods related environmental field are classified as KS I, total 635 methods and 583 KS I methods were harmonized with ISO. For Environmental Standard methods for drinking water, 100 methods were reviewed according to 232 KS methods related to ISO/ TC 147 "Water Quality". Environmental Standard methods for indoor air quality were reviewed according to 95 KS standard methods related to ISO/TC 146 "Air Quality". By reviews and comparison tests for unifiable ES for drinking water and indoor air quality with KS methods harmonized with ISO, it was evaluated that for 100 ES methods for drinking water, 23 ES methods were unification complete, 29 ES methods were unification possible, 12 ES methods were unification impossible, no corresponding methods were found in KS I ISO for 36 ES methods and for 17 ES methods for indoor air quality,1 ES methods were unification complete, 3 ES methods were unification possible, 3 ES methods were impossible, no corresponding methods were found in KS I ISO for 10 ES methods.

Comparison of the Net Inflow Rates of Seawater Exchange Breakwater of Different Shapes (해수교환방파제의 형상별 순유입유량 특성 비교)

  • Lee, Dal-Soo;Lee, Chang-Hoon;Oh, Young-Min;Chun, In-Sik;Kim, Chang-Il
    • Ocean and Polar Research
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    • v.25 no.spc3
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    • pp.393-397
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    • 2003
  • The seawater exchange breakwaters can be effectively employed to conserve or enhance the water quality inside harbors by transmitting the exterior water into the harbor. In the present study, three shapes of the breakwater, that is, the flow conduit embedded type, the wave chamber type and the oscillating water channel type are compared far their water exchanging capability through regular wave experiments. The results show that the net influx of water appears differently depending on wave period for each breakwater type. The net influx of the wave chamber type is much greater than that of the flow conduit embedded type. It is also ascertained that the influx of the oscillating water channel type can be greatly enhanced by attaining the resonance condition inside the channel at the wave periods frequently occurring at the fields where the breakwaters are to be installed.

A Study on the Variation of Water Quality and the Evaluation of Target Water Quality Using LDC in Major Tributaries of Nakdong River Basin (낙동강수계 주요 지류의 수질특성변화 및 LDC를 이용한 목표수질 평가에 관한 연구)

  • Lee, Sangsoo;Kang, Junmo;Park, Hyerim;Kang, Jeonghun;Kim, Shin;Kim, Jin-pil;Kim, Gyeonghoon
    • Journal of Korean Society on Water Environment
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    • v.36 no.6
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    • pp.521-534
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    • 2020
  • In this study, the variation of water quality was analyzed for six sites in major tributaries of the Nakdong River Basin. Standard-FDC (Flow Duration Curve) was developed using PM (Percentile Method), one of the statistical FDC estimation methods. The LDC (Load Duration Curve) was obtained using the developed FDC. The current method and the LDC evaluation method were compared and analyzed to evaluate the achievement of TWQ (Target Water Quality). Regarding the monthly flow rate variation, the five sites showed the distribution of the lowest flow rate between May and June, indicating a high probability of dry weathering of the streams. The variation of water quality confirmed the vulnerable timing of flow rate in each site, and it is therefore deemed necessary to plan to reduce T-P and TOC. A comparison and evaluation of TWQ showed that there was a difference between the TWQ values achieved by the two techniques. In addition, the margin ratio to the 50% excess ratio can be found in the LDC evaluation. The results of the LDC evaluation by section and by month showed whether or not the water quality was exceeded by flow conditions, along with the vulnerable sections and timing. Accordingly, it is judged that this method can be used for water quality management in TMDLs (Total Maximum Daily Loads).

Analysis and Comparison about NPS of Plane Field and Alpine Field (평지밭과 고랭지밭의 비점오염에 대한 분석과 비교)

  • Choi, Yong-hun;Won, Chul-hee;Seo, Ji-yeon;Shin, Min-Hwan;Yang, Hee-jeong;Lim, Kyoung-jae;Choi, Joong-dae
    • Journal of Korean Society on Water Environment
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    • v.25 no.5
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    • pp.682-688
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    • 2009
  • A plane field and a sloped field located at low-land plane and alpine areas, respectively, were monitored with respect to runoff, water quality and fertilizer uses from March to December, 2008. Runoff volume and Non-Point Source (NPS) loads were estimated and analyzed with respect to fertilizer uses. Total TN and TP loads from the sloped field were higher than those from plane field because of larger chemical uses in the alpine field than in the plane field. Organic matter load from plane field was higher than that from sloped field because more organic compost was applied to plane field than to sloped field. Event Mean Concentration (EMC) of measured water quality indices were relatively higher in both fields. Organic matter load per 1 mm rainfall were higher in plane field and TN and TP loads per 1 mm rainfall were higher in sloped field than those in respective comparing field. It was concluded that the type and application method of fertilizer could play an important role in the estimation of NPS pollution loads and the development of Best Management Practices (BMPs). However, it was recommended that long-term monitoring is necessary to better describe the relationship between fertilizer uses and water quality from agricultural fields because numerous natural and management factors other than fertilizer also affect runoff quality.

Water Quality Control in the Semiclosed Culture System Growing a Flounder, Paralichthys Olivaceus (반폐쇄 순환여과식 넙치양식장의 수질제어에 관한 연구)

  • YANG Byung-Soo;LEE Heon-Mo;JEONG Byung-Gon
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.25 no.3
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    • pp.197-204
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    • 1992
  • A comparative evaluation of water quality in the existing semiclosed fish culture system was made to improve the system management. From the comparison of water quality between the flow-through mode and the recycle mode of the semiclosed system, the malfunctioning of the settling channel deteriorated water quality and reduce the nitrification rate in the recycle mode. The peak concentrations of COD, $PO_4-P$ and SS in the fish tanks appeared just after feeding, and then decreased to normal levels within two hours. However, the $NH_4-N$ concentration increased slightly after two hours of feeding in the recycle mode. The water exchange rate was directly related to the water quality in the semiclosed fish culture system.

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Evaluation of Korean Water Quality Standards in Winter by Characteristics and Statistical Analyses of the Effluent Water Quality at the Sewage Treatment Plants in Korea (우리나라 공공하수처리시설의 방류수 수질현황 분석을 통한 겨울철 방류수수질기준의 적정성 평가)

  • Um, Chul Yong;Chu, Kyoung Hoon;Yun, Zu Whan;Choi, Ik Hoon;Park, Jae Young;Lee, Han Saem;Ko, Kwang Baik
    • Journal of Korean Society on Water Environment
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    • v.27 no.4
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    • pp.523-532
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    • 2011
  • In this study, from 2004 to 2008 influents and discharging effluents from 241 municipal public sewage treatment plants were surveyed. Statistics including average, Coefficient of Variation (CV) and Coefficient of Reliability (COR) for each season, time series analysis for removal efficiency and water quality of effluents, and a comparison of the effluent standards in Korea and other countries were presented. The average concentrations of TN and TP in influents. during winter season were 32.6 and 3.78 mg/L and during other season were 30.8 and 3.61 mg/L in 2008, respectively. The average TN concentration on the basis of the maximum monthly concentrations in the effluents during winter season ranged from 14.2~17.4 mg/L and during other season ranged from 12.2~14.8 mg/L. The TP concentration in the effluents depending on the each season was no big difference. TN removal efficiency decreased from Jan. to Feb. and TP removal efficiency decreased in Jan., Jun and July. Maximum COR during winter season were 0.61 but the COR for TN and TP during other season ranged from 0.96~1.48 and 1.09~1.81, respectively, due to big difference in the standard for TN and TP in effluents depending on the season. TN and TP standards for effluent of sewage treatment during winter season in Korea was much higher than those in other countries. Therefore the lower effluent standards during winter season is essential for the water quality improvement.

Effects on Water Quality in the Development and the Comparative Analysis of Water Quality Results in Post-environmental Impact Investigation - Focused on a Quarry Mine and Sports Facilities - (개발 사업에 의한 수질영향조사 및 사후환경영향조사 수질결과에 대한 비교·분석 -토석채취사업 및 체육시설 조성사업을 중심으로-)

  • Lee, Seyong;Roh, Younghee;Cho, Hanna;Maeng, Junho
    • Journal of Environmental Impact Assessment
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    • v.26 no.6
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    • pp.524-537
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    • 2017
  • Post-Environmental impact investigation(Post-EII) plays an important role in investigating and reducing the environmental impacts of construction operations in South Korea. To date, it has been estimated that the results for Post-EII showed the low reliability; however, understanding those reliability has rarely been studied. We investigated the effect on water qualities by construction operations of the quarry mine, training center, and golf club in South Korea. In addition, the results of water quality analysis in this study were compared and analyzed with those in Post-EII. Treated wastewater in a quarry mine showed high concentrations of biochemical oxygen demand(BOD), suspended solid(SS), total nitrogen(T-N), and total phosphorus(T-P). Compared with the water quality results between this study and Post-EII, the concentrations of BOD, SS, T-N, and T-P in the treated wastewater were higher than the interquartile range(IQR) as well as the range of the results from minimum to maximum in Post-EII(p<0.05). The concentrations of BOD, SS, T-N, and T-P in treated wastewater were high under constructions in a training center. The concentrations of BOD and SS exceeded the consultation standard for the treated wastewater. These concentrations showed the significant difference with the IQR and the range from minimum to maximum of the water quality results in Post-EII(p<0.05). Therefore, the management and monitoring for water quality should be conducted in the treated wastewater by of construction operations. In addition, the alternative to enhance the reliability for the water quality results should be sought in Post-EII.

A Study on Evaluation and Prioritization Process of Wastewater Reuse Alternative in Watershed Level (유역차원의 하수처리수 재이용 대안평가와 우선순위 결정과정에 관한 연구)

  • Chung, Eun-Sung;Jun, Sang-Mook;Lee, Jin Hee;Ahn, Jong Ho
    • Journal of Korean Society on Water Environment
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    • v.29 no.2
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    • pp.259-269
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    • 2013
  • This study aims to show the feasibility of wastewater reuse through hydrological analysis and propose a framework for planning using multi-criteria decision making technique. Ten alternatives of wastewater reuse (BOD: 3.0 mg/L & 4.7 mg/L) and two references in the urban watershed were considered and analyzed by using Hydrological Simulation Program in Fortran (HSPF). Though wastewater reuse has a positive effect on water quantity, it may degrade the water quality due to the high discharge concentration. This study showed that wastewater reuse can be a great alternative for the rehabilitation of distorted water cycle, if the quality is improved up to the natural streamflow and the quantity is increased up to the instreamflow requirement. In addition, to determine the project priority, three criteria were compared: 1) impacts on water quantity and water quality, respectively, 2) consideration of present hydrologic vulnerabilities on water quantity and quality and not, and 3) social and economic considerations and not. From the performance values to all criteria, the specific ranking can be derived and the feasibility of each wastewater reuse project can be checked with the comparison of the existing facilities. As a result, DJ and DR were derived to become effective in any evaluation conditions while SS and WG were improper alternatives if various criteria were considered. The decision making for project prioritization must be careful with the consideration of various impacts of wastewater reuse because the evaluation of wastewater reuse alternative showed very different priorities for each criteria.

Temporal and spatial variation analysis on nutritive salt of Hongze Lake

  • Zhang, Min;Chu, Enguo;Xu, Ming;Guo, Jun;Zhang, Yong
    • Environmental Engineering Research
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    • v.20 no.1
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    • pp.19-24
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    • 2015
  • This paper mainly focuses on the research of the monitoring data about the total nitrogen (TN), total phosphorus (TP) of ten monitoring points of Hongze Lake in 28 years. Our study adopts the technical methods such as difference comparison, correlation analysis, Mann-Kendall, etc. to analyze the statistical characteristics, regional differences, and temporal and spatial variation condition of ten monitoring points of Hongze Lake in 1986-2013 as well as the reason for the time and space variation of TN and TP. The results show that the TN and TP of Hongze Lake change dramatically during the period of 1994-2004. In all the monitoring periods, TN and TP of the HZ5, HZ6, HZ7, HZ8 monitoring points in the estuary surrounding the Huaihe River are the highest, which suggests that TN and TP of Hongze Lake should not be ignored for the pollution along the Huaihe River. The TN concentration in the core area is the highest, but that in the development control area is the lowest. In most of the years, TN concentration is higher than 2 mg/L, and the water quality is V class and poor V class water quality in China's Environmental Quality Standards for Surface Water (GB3838-2002). TP concentration of the three areas is basically close, that is lower than 2 mg/L in most of the years, and the water quality is within the V class. The TN and TP concentration of Hongze Lake decreased and intensifying trend of eutrophication is controlled after 2004.

Quality Comparison of Activated Carbon Produced From Oil Palm Fronds by Chemical Activation Using Sodium Carbonate versus Sodium Chloride

  • MAULINA, Seri;HANDIKA, Gewa;Irvan, Irvan;ISWANTO, Apri Heri
    • Journal of the Korean Wood Science and Technology
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    • v.48 no.4
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    • pp.503-512
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    • 2020
  • Using Na2CO3 versus NaCl as chemical activator, we compared the quality of activated carbon produced from oil palm fronds as raw material. These activators were selected for comparison because both are readily available and are environmentally friendly. In the manufacturing, we used Indonesian National Standard (SNI 06-3730-1995) parameters. For the quality comparison, we determined activated-carbon yield, moisture, ash, volatiles, and fixed-carbon contents; and adsorption capacity of iodine. The best characteristics, assessed by morphological surface analysis and Fourier transform infrared (FTIR) spectral analysis, were observed in the carbon activated by Na2CO3 at an activator concentration of 10% and carbonization temperature of 400 ℃. The results were as follows: activated-carbon yield, 84%; water content, 8.80%; ash content, 2.20%; volatiles content, 14.80%; fixed-carbon content, 68.60%; and adsorption capacity of iodine, 888.51 mg/g. Identification using the FTIR spectrophotometer showed the presence of the functional groups O-H, C=O, C=C, C-C, and C-H in the Na2CO3-activated carbon.