• 제목/요약/키워드: wastewater flow

검색결과 672건 처리시간 0.034초

浸漬型 生物膜反應槽에 의한 負荷變動에서의 基質除去에 관한 연구 (A Study of Substrate Removal in Wastewater Flow Variations by Submerged Biofilm Reactor)

  • Nam, Chul-Hyun;Park, Jong-Woong
    • 한국환경보건학회지
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    • 제13권2호
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    • pp.83-90
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    • 1987
  • The objective of this study is to review the basic theories related substrate removal in wastewater flow variations using submerged biofilm reactor. An aerated biofilm reactor is that in which influent organic substrates are aerobically oxidized by the microorganisms of biofilm grown on the surface of submerged media. No sludge is returned, and oxygen is supplied by diffusers. Three types of aerated biofilm reactor are one stage-central aeration, one stageup flow aeration and two stage-side aeration. The orders of substrate removal capacity in wastewater flow variations showed two stage-side aeration, one stage-upflow aeration and one stage-central aeration. The phenonmenon of nonclosing volid in upflow aeration type was superior to these in central-side aeration type. Attached biofilm masses in case of upflow, side and central aeration reactor were 1.0mg/cm$^2$, 4.1 mg/cm$^2$ and 0.93 mg/cm$^2$, respectively. Yield coefficient for biofilm was 0.31 to 0.48. Especially, removal efficiency can be increased remarkably according to the number of biofilm reactor and the packed condition of media.

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동력학적 수리해석모델 해석을 통한 하수관거능력 평가 (Evaluation of Sewer Capacity using Kinetic Hydraulic Model)

  • 양해진;전항배;손대익;이준
    • 상하수도학회지
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    • 제23권5호
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    • pp.565-572
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    • 2009
  • Hydraulic modeling is widely used to simulate wastewater flow. The simulated models are used to prevent flood and many other problems associated with wastewater flow in planning or rehabilitating sewer systems. In this study, MAKESW (An engineer, South Korea), MOUSE (DHI, Denmark), and SWMM (XPSoftware, USA) are used to for hydraulic modeling of wastewater in C-city, South Korea and E-city, Iraq. These modeling tools produced different results. SWMM comparably overpredicted runoff and peak flow. In using SWMM, use of accurate data with a high confidential level, detail examination over the target basin surface, and the careful selection of a runoff model, which describes Korea's unique hydraulic characteristics are recommended. Modification of existing models through the optimization of variables cannot be achieved at this moment. Setting up an integrated modeling environment is considered to be essential to utilize modeling and further apply the results for various projects. Standardization of GIS database, the criteria for and the scope of model application, and database management systems need to be prepared to expand modeling application.

순환공정법(循環工程法)을 적용(適用)한 인공(人工) 사진폐액(寫眞廢液)으로부터의 전해채취(電解採取)에 의한 은(銀)의 회수(回收) (Recovery of Silver from Artificial Photographic Wastewater by Continuous Flow Electrolytic Process)

  • 정원주;김동수
    • 자원리싸이클링
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    • 제16권1호
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    • pp.68-72
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    • 2007
  • 전기적 환원을 이용한 인공 사진폐수에서의 은 회수를 연속순환식 공정을 적용하여 환원시간 및 두 전극간의 전합 차, 농도유량에 따른 영향을 검토하였다. 은 함유 인공폐수 처리에 있어 적용(인가) 전압과 초기 농도가 증가함에 따라 제거율이 증가함을 보였다. 은 함유 인공폐수의 전해 반응 시, 음극에 환원 석출된 물질의 정성적인 분석을 위해 EPMA 및 XRD 분석 결과, 석출된 물질이 은임을 확인하였다.

효과적 공간활용을 위한 Side Stream Plug-Flow Reactor를 이용한 하수 고도처리 공정 적용에 관한 연구 (A study on Applicable to Advanced treatment of using Side Stream Plug-Flow Reactor)

  • 김삼주;현인환;독고석
    • 상하수도학회지
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    • 제22권3호
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    • pp.367-372
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    • 2008
  • This study configured the conventional $A^2O$ (Anaerobic-Anoxic-Aerobic bioreactor) system which the fixed media immersed into the anoxic reactor(Named PFR system : Plug Flow Reactor) for evaluating the removal efficiency of nitrogen in the wastewater. The experimental equipment was a cylinder which was consist of 4 pleated PE Pipes(Length 330M, Diameter 100mm) including 2 rope shape media. As a result, the average effluent T-N removal efficiency of the conventional $A^2O$ system was 17.9, 40.3, 50.6, 44.6% in each mode, but the average effluent T-N removal efficiency of the PFR system could achieve 38.8, 57.1, 71.8, 65.4% in each mode. It indicated that the PFR system caused to the increasing of C/N ratio that effected to the increasing of the denitrification efficiency. Not only the effective T-N removal efficiency but also the controllable install space will give advantages for retrofitting of the wastewater treatment plant with the conventional treatment system to the PFR system.

소규모 오수발생지역의 고도처리시설을 위한 상.하 흐름형 인공습지 개발 (Development of Up- and Down-flow Constructed Wetland for Advanced Wastewater Treatment in Rural Communities)

  • 김형중;윤춘경;권태영;정광욱
    • 한국농공학회논문집
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    • 제48권6호
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    • pp.113-124
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    • 2006
  • The feasibility of the up- and down-flow constructed wetland was examined fur rural wastewater treatment in Korea. Many constructed wetland process was suffered from substrate clogging and high plant stresses because of long term operation. The up- and down-flow constructed wetland process used porous granule materials (charcoal pumice : SSR=10:20:70) for promoting intake rate of nutrient to plant, and especially flow type was designed continuously repeating from up-flow to down-flow. $BOD_5$ and SS was removed effectively by the process with the average removal rate being about 75% respectively. The wetland process was effective in treating nutrient as well as organic pollutant. Removal of TN and TP were more effective than other wetland system and mean effluent concentrations were approximately 7.5 and $0.4mg\;L^{-1}$ which satisfied the water quality standard for WWTPs. The treatment system did not experience any clogging or accumulations of pollutants and reduction of treatment efficiency during winter period because constructed polycarbonate glass structure prevented temperature drop. Considering stable performance and effective removal of pollutant in wastewater, low maintenance, and cost-effectiveness, the up- and down-flow constructed wetland was thought to be an effective and feasible alternative in rural area.

교방천 복원을 위한 분산형 유지유량 확보 방안 연구 (I): 수량.수질 타당성 검토를 위한 도시 물순환 모형 적용 (Study on decentralized options of the in-stream flow for restoring the Gyobang cheon: application of the Urban Volume and Quality (UVQ) model to examine feasibilities in water quantity and quality)

  • 신상민;최고은;이상은;박희경
    • 상하수도학회지
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    • 제25권5호
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    • pp.699-706
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    • 2011
  • This study has a purpose of examining technical feasibility of supplying the in-stream flow for the Gyobang cheon by using treated water from small wastewater treatment facilities as a decentralized option. To do this, the water and contaminant flow in study areas of the Gyobang cheon are defined from the context of the integrated urban water cycle, and analyzed by using the Urban Volume and Quality (UVQ) model. First, the UVQ model was built for the study areas of the Gyobang cheon and calibrated with observation data. Second, the decentralized options of the in-stream flow was explored with consideration of availability of water sources. The UVQ simulation then led to selecting the best option which would meet the criteria of water quantity and quality. It was finally concluded that using water sources out of study areas 1 and 2, adjoining the upper part of the Gyobang cheon, in the decentralized manner can be a feasible option for in-stream flow. It also seems that the UVQ model is useful to understand the water cycle in study areas of the Gyobang cheon.

Electrooxidation of tannery wastewater with continuous flow system: Role of electrode materials

  • Tien, Tran Tan;Luu, Tran Le
    • Environmental Engineering Research
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    • 제25권3호
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    • pp.324-334
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    • 2020
  • Tannery wastewater is known to contain high concentrations of organic compounds, pathogens, and other toxic inorganic elements such as heavy metals, nitrogen, sulfur, etc. Biological methods such as aerobic and anaerobic processes are unsuitable for tannery wastewater treatment due to its high salinity, and electrochemical oxidation offers a promising method to solve this problem. In this study, raw tannery wastewater treatment using DSA® Ti/RuO2, Ti/IrO2 and Ti/BDD electrodes with continuous flow systems was examined. Effects of current densities and electrolysis times were investigated, to evaluate the process performance and energy consumption. The results showed that a Ti/BDD electrode is able to reach higher treatment efficiency than Ti/IrO2, and Ti/RuO2 electrodes across all parameters, excluding Total Nitrogen. The main mechanism of tannery wastewater oxidation at a Ti/BDD electrode is based on direct oxidation on the electrode surface combined with the generation of oxidants such as °OH and Cl2, while at DSA® Ti/RuO2 and Ti/IrO2 electrodes, the oxidation mechanisms are based on the generation of chlorine. After treatment, the effluents can be discharged to the environment after 6-12 h of electrolysis. Electrooxidation thus offers a promising method for removing the nutrients and non-biodegradable organic compounds in tannery wastewater.

2단간헐폭기 및 유로변경 간헐폭기 활성슬러지 시스템을 이용한 도시하수 처리 (Performances of Intermittently Aerated and Dynamic Flow Activated Sludge Process)

  • 원성연;민경국;이상일
    • 환경위생공학
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    • 제13권1호
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    • pp.26-31
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    • 1998
  • Removal of nitrogen and phosphate in wastewater is concerned to important for the prevention of eutrophication in receiving water and lake. Conventional activated sludge system designed for organics removal can be retrofitted only by modification of aeration basin to maintain anaerobic and aerobic state. Biological nutrient removal processes(BNR) such as Bardenpho, A$^{2}$/O, UCT, VIP were generally used for the treatment of wastewater. However these BNR processes used in large scale WWTP were not suitable in small scale WWTP(i.e., package type WWTP) due to relatively large fluctuation of flow rate and concentration of pollutants. The purpose of this research was to develop the compact, effective and economical package type WWTP for the removals of carbon and nitrogen in small scale wastewater. Intermittently aerated activated sludge system (IADFAS) were investigated for removal of nitrogen in both domestic wastewater, Bardenpho process was also evaluated. Nitrogen removal of IAAS, IADFAS, Bardenpho were 75, 77 and 67%, respectively.

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고온호기발효공법을 이용한 유기성폐수의 처리 (The Treatment of Organic Wastewater using Thermophilic Oxic Process)

  • 유순주;류재근;서윤수;도삼유평
    • 환경위생공학
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    • 제10권2호
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    • pp.13-22
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    • 1995
  • Most of small- scale livestock facility have difficulties to treat organic wastewater by activated sludge process as distinguished feces and urine. The organic wastewater discharged have characteristics of slurry, high concentration of BOD, 55 etc. This study was performed to estimate suitable condition for the application of packing materials, air flow, pollutant load and so on as important parameter to treat organic wastewater by thermopile oxlc process. As a result obtained at this experiments the most suitable condition for BOD load, air flow indicate 3.0kg · m$^{-3}$ day$^{-1}$,50 ∼ 100L· min$^{-1}$ m$^{-3}$, respectively, and we knew that it was necessary to add waste contained high calories to degrade about 80% of pollutant among waste- water. It showed that plastic material can be used as packing media because it can be provided as inhabitation for microorganism owing to intensity of material and characteristic of keeping moisture.

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고양정 및 저유량을 만족하는 폐수처리용 펌프 설계 최적화 (Design Optimization on Wastewater Treatment Pump of Satisfaction for High Head and Low Flow Rate)

  • 김성;김진혁
    • 한국수소및신에너지학회논문집
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    • 제33권5호
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    • pp.583-590
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    • 2022
  • In this paper, the performance characteristics of the 2 vane pump for wastewater treatment were investigated using response surface method(RSM) with commercial computation fluid dynamics(CFD) software. Design variables of wastewater treatment pump were defined with the meridional plane of the 2 vane pump impeller. The objective functions were defined as the total head and the efficiency at the design flow rate. The hydraulic performance of optimum model was verified by numerical analysis and the reliability of the model was retained by comparison of numerical analysis and comparative analysis with the reference model.