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한국수처리학회> 한국수처리학회지> 상수관로 고유속 관망 설계 적용에 따른 효과분석

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상수관로 고유속 관망 설계 적용에 따른 효과분석

Effectiveness Analysis of High Velocity Water Distribution Network Design

박정수 ( Jeong-soo Park ) , 이호민 ( Ho Min Lee ) , 배철호 ( Cheol-ho Bae ) , 최태호 ( Tae-ho Choi ) , 이승엽 ( Seungyub Lee )
  • : 한국수처리학회
  • : 한국수처리학회지 29권6호
  • : 연속간행물
  • : 2021년 12월
  • : 3-11(9pages)
한국수처리학회지

DOI

10.17640/KSWST.2021.29.6.3


목차

1. 서론
2. 연구방법
3. 연구결과
4. 결론
References

키워드 보기


초록 보기

Traditional water distribution network (WDN) design approaches have primarily focused on fulfilling hydraulic conditions such as water pressure and demand while placing less emphasis on water quality issues. Owing to a large number of documented water quality failures, there has been an increasing interest in water quality management throughout the design or operational phases of WDNs. This paper presents a novel approach for designing high-velocity WDNs to improve water quality security and satisfy the hydraulics of the network. The following is a summary of the procedures: (1) define the hydraulic and water quality factors, (2) determine the network layout using the modified branched index, and (3) determine the pipe diameter in the network to achieve self-cleaning velocity. The proposed approach was applied to a portion of the CW city network. As a result, the network layout was transformed to a branched network to reduce the number of pipes that did not meet the self-cleaning velocity requirements. If the pipe did not achieve self-cleaning velocity after transforming the layout, additional pipe diameter adjustments were made to satisfy the self-cleaning velocity requirements. Owing to this effort, the length of the network was reduced, and 78.8% of the pipes achieved self-cleaning velocity. In addition, water age at dead-ends and changes in water age were minimized, allowing for efficient water quality management of the network.

UCI(KEPA)

I410-ECN-0102-2022-500-000944844

간행물정보

  • : 공학분야  > 환경공학
  • : KCI등재
  • :
  • : 격월
  • : 1225-7192
  • : 2289-0076
  • : 학술지
  • : 연속간행물
  • : 1993-2022
  • : 1396


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1녹조오염 호소수의 수질특성과 흡착여과공정에 미치는 영향

저자 : 김지연 ( Ji-yeon Kim ) , 현길수 ( Kil-soo Hyun )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 30권 1호 발행 연도 : 2022 페이지 : pp. 3-10 (8 pages)

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The objectives of this study were to characterize an algae polluted-lake water using conventional variables of Trophic State Index Korea (TSIko) and to evaluate the performances of granular activated carbon (GAC) adsorption and the filtration of membrane filter (MF) using stirred dead end filtration cell on pollutants removal (COD, T-N, T-P, chlorophyll-a (chl-a), secchi disc (SD), and dissolved organic matter(DOC)) in the algae-polluted-lake water. As a result, regression analyses of log transformed seasonal Chl-a against T-P and T-N showed that variation of the Chl-a was explained by the variation of T-P(r= 0.3887) but not by T-N(r=0.2721). Consequently, The data obtained from this study suggest that one of the ways controlling the eutrophication would be a reduction of phosphorus from the watershed. Applied filtration rates during this experiment were <4.0 m/h for GAC bed and 0.5 m3/m2.d for MF. Both GAC bed and GAC/MF system achieved more than 40% efficiency in removing geosmin and 2-methylisoborneol(2-MIB). The combined membrane process with GAC adsorption process was found to produce the highest quality finished water and could be proposed as one of the best available processes for removing geosmin. The increase of influent algae and DOC increased transmembrane pressure (TMP) of MF process. Membrane resistance of MF process coupled with GAC bed was lower than that MF process.

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2니켈 함유 폐수의 침전 처리에 대한 열역학적 기초 연구

저자 : 송혜원 ( Hyewon Song ) , 김동수 ( Dong-su Kim )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 30권 1호 발행 연도 : 2022 페이지 : pp. 11-18 (8 pages)

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Nickel is a widely used chemical species, but it is also known for its toxicity. The Pourbaix diagrams were constructed to investigate the influences of temperature and hydrogen ion on wastewater which contains nickel ion. Nickel exists as Ni3O4, Ni(OH)2, Ni2+, and Ni in the water of pH 0 to 14. In the temperature range of 288K to 318K, Ni(OH)2 was shown to have stable region from pH 5.7 to pH 14, and the area of stable region increases with temperature. The ratio of Ni(OH)2 to Ni and the ratio of Ni(OH)2 to Ni2+ wereexamined to be greater than the ratios of Ni3O4 to Ni and Ni3O4 to Ni2+, respectively. Also, the ratio of Ni(OH)2 to Ni2+ and the ratio of Ni3O4 to Ni2+ were shown to be proportional to the temperature, while Ni was not. The reduction-precipitation process of nickel ion to Ni(OH)2 by controlling the pH depending on the temperature following the value of pH 6.29 at 288K, pH 6.08 at 298K, pH 5.88 at 308K, and pH 5.70 at 318K, can be used to decrease concentration of nickel ion in wastewater and recover nickel from wastewater in the form of Ni(OH)2.

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3공공폐수처리시설의 연계처리 방안에 관한 연구 - 달성1차 산업단지 위주로

저자 : 조규진 ( Kyu-jin Cho ) , 박상원 ( Sang-won Park ) , 류태욱 ( Tae-uk Ryu )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 30권 1호 발행 연도 : 2022 페이지 : pp. 19-25 (7 pages)

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In this study, economical and efficient sewage and wastewater treatment methods were analyzed by distributing sewage flowing into the public wastewater treatment facility from the residential area of Dalseong 1st industrial complex to nearby sewage and wastewater treatment facilities. In the future, it was attempted to predict the increase in the amount of wastewater by industry by analyzing the change trend by industry within the Dalseong 1st Industrial Complex. Therefore, the environmental infrastructure around the Dalseong 1st Industrial Complex with the possibility of linked treatment was investigated. Based on this, the Hyeonpung Sewage Treatment Plant was judged to be suitable in consideration of various legal considerations such as the flow rate of each facility and effluent water quality standards. The distance from the public wastewater treatment facility in the Dalseong Industrial Complex to the Hyeonpung sewage treatment plant, the diameter of the pipe, and the type of pipe were reviewed, and the total project cost was more than KRW 2.8 billion. The Dalseong 1st Industrial Complex treats both sewage from residential areas and wastewater from industrial complexes, and the Hyeonpung Sewage Treatment Plant selected as the linked treatment area is a sewage treatment plant. Therefore, it is judged that the administrative procedure for changing the residential area of the Dalseong 1st Industrial Complex from a public wastewater treatment plant to a sewage treatment plant and consultation with related organizations is necessary.

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발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 6호 발행 연도 : 2021 페이지 : pp. 3-11 (9 pages)

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초록보기

Traditional water distribution network (WDN) design approaches have primarily focused on fulfilling hydraulic conditions such as water pressure and demand while placing less emphasis on water quality issues. Owing to a large number of documented water quality failures, there has been an increasing interest in water quality management throughout the design or operational phases of WDNs. This paper presents a novel approach for designing high-velocity WDNs to improve water quality security and satisfy the hydraulics of the network. The following is a summary of the procedures: (1) define the hydraulic and water quality factors, (2) determine the network layout using the modified branched index, and (3) determine the pipe diameter in the network to achieve self-cleaning velocity. The proposed approach was applied to a portion of the CW city network. As a result, the network layout was transformed to a branched network to reduce the number of pipes that did not meet the self-cleaning velocity requirements. If the pipe did not achieve self-cleaning velocity after transforming the layout, additional pipe diameter adjustments were made to satisfy the self-cleaning velocity requirements. Owing to this effort, the length of the network was reduced, and 78.8% of the pipes achieved self-cleaning velocity. In addition, water age at dead-ends and changes in water age were minimized, allowing for efficient water quality management of the network.

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발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 6호 발행 연도 : 2021 페이지 : pp. 13-20 (8 pages)

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Nitrogen is a very common element both in the atmosphere and in the water. The effect on temperature to the nitrogen compounds has been observed by constructing the nitrogen-water Pourbaix Diagram at 278 K, 288 K, 298 K, 308 K, and 318 K. Typically, between pH -2 to 16, nitrogen was examined to be stable as NO3 -, NH4 +, NO2 -, and NH4OH. The absolute values of the slope of the boundary line between each chemical species were shown to increase as the temperature increases. The area of each chemical species in a stable state was calculated to compare the tendency of existing form of each chemical species. The areas of the stable region for NH4 + was observed to decrease with temperature, while those for NO3 -, NH4OH, and NO2 - were investigated to increase linearly as the temperature increases. The thermodynamical calculation applied in this study is expected to be further studied and applied to water control and purification of water from contamination such as algal bloom.

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Radiation severely damages the environment in the event of a radioactive explosion, such as the one that occurred at the Fukushima nuclear power plant in 2011. Radioactive cesium and radioactive iodine, in particular, are known to be the main causes of environmental pollution. This study aimed to develop a composite adsorbent that can remove Cs+ and I- from a waterbody simultaneously. Prussian blue (PB) and organoclay are known to be effective in adsorbing cesium and iodide, respectively. Therefore, an organoclay-PB in alginate (OPAL) bead with layer-by-layer synthesis was developed. Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric (TG) analyses were used to determine if organoclay and PB were synthesized in the OPAL bead. According to the isothermal adsorption experimental results, the maximum adsorption capacity of Cs+ and I- obtained using the Langmuir isotherm model was 26.4 and 3.39 mg/g, respectively. The adsorption rate of Cs+ on the OPAL bead was found to be fast in a dual solute adsorption system. The adsorption capacity of the single and dual solute adsorption systems for Cs+ ions increased rapidly up to 1 h, and the adsorption equilibrium was attained 3 h later. The dual solute adsorption system had a higher adsorption rate for I- ions. This demonstrates that the developed composite adsorbent can be used to remove Cs+ and I- from water simultaneously.

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Although sewage treatment plants play an important role in water purification, odors from the facilities are frequently a source of complaints, eliciting objections from both plant workers and neighbors. Hydrogen sulfide is a natural by-product of anaerobic digestion that has a strong, unpleasant odor. Therefore, many researchers in Korea have attempted to characterize odors emitted by sewage treatment plants in odor to reduce their emissions. However, these researches have primarily focused on odor intensity scales or the measurement of odor compounds in several sites without considering detailed information of the statistical analysis. In this study, using 75th percentile of unit processes as the complex odor, the operations connected with sludge thickening were discovered to be the main emission sources of odorous substances, followed by primary settling, equalization, anaerobic, dewatering, anoxic, preliminary treatment, and aerobic processes. These results will be aid in identifying major odor sources associated with sewage treatment processes and prioritizing an odor control plan. In this study, the possibility of predict complex odor from hydrogen sulfide concentrations was considered when performing correlation and regression analysis. It could be used to define the requirements for installing odor eliminators and establishing odor regulations in sewage treatment plants.

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Nondestructive diagnostic technology can be used to check for abnormalities such as metal loss, deformation, and cracks in water pipelines. However, new standards and guidelines for water pipeline maintenance must be revised or established in order to apply new technologies such as nondestructive diagnosis to the field. Herein, policies and guidelines are proposed for the diagnosis of water pipelines using nondestructive technology. Amendments are proposed to allow accurate and reliable nondestructive diagnostic technology to be applied to pipeline maintenance by reviewing the diagnostic standards and laws for water pipelines. The design standards for water conveyance, water transmission, and water distribution pipelines have been revised in order to use advanced technologies such as nondestructive technology to identify abnormalities while minimizing the impact on facilities when inspecting and diagnosing water pipelines. In addition, a revision of the detailed guidelines of the Ministry of Land, Infrastructure, and Transport according to the KS and ASTM standard is required to allow for the use of nondestructive equipment when inspecting welds. Nondestructive diagnostic guidelines that summarize the characteristics and performance of nondestructive diagnostic equipment, diagnostic procedures, and verification processes are also proposed to help managers understand the technology and easily apply it in the field when diagnosing water pipelines.

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