• Title, Summary, Keyword: Hydrocyclone

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Development of Dual Hydrocyclone Advanced Treatment Process for Total Phosphorus Removal (총인제거를 위한 Dual Hydrocyclone 고도처리공정 개발)

  • Lee, Myungjin;Yang, Seungho;Song, Daehyun;Lee, Junho
    • Journal of the Korean Society of Urban Environment
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    • v.17 no.3
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    • pp.271-280
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    • 2017
  • Ministry of Environment significantly from 2012, the public of the effluent water quality standards for water quality improvement of the sewage treatment plant effluent station in total phosphorus(TP) existing 2.0 mg/L to entry in the 0.2 mg/L or less separated into four regions to 2.0 mg/L or less. Accordingly, in order to satisfy the water quality standard of discharged water, various examination of the total phosphorus treatment according to the water quality characteristic is needed. In this study, developed a dual hydrocyclone advanced treatment process to enhanced the flocculation process and to remove TP efficiently. As a result of analyzing the treatment characteristics of the TP by the pilot plant, the concentration of treated water was 0.07~0.16 mg/L(mean 0.10 mg/L) and could be satisfied the concentration range of 0.2 mg/L less. The velocity gradient inside the dual hydrocyclone is estimated to be higher than the range of the commonly suggested G value, so that diffusion and mixing of the coagulant can be performed with a small capacity. The G t value of the external hydrocyclone for floc formation is in a suitable range And it was found that it satisfied the conditions of floc formation. Accordingly, the dual hydrocyclone advanced treatment process can reduce the volume of the process with a small capacity and a short residence time, and it is possible to form a cohesive floc only by feeding the pump, so that it is advantageous in terms of cost reduction and maintenance in a compact process configuration.

Performance Evaluation of Hydrocyclone Filter for Treatment of Micro Particles in Storm Runoff (Hydrocyclone Filter 장치를 이용한 강우유출수내 미세입자 제거특성 분석)

  • Lee, Jun-Ho;Bang, Ki-Woong;Hong, Sung-Chul
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.11
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    • pp.1007-1018
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    • 2009
  • Hydrocyclone is widely used in industry, because of its simplicity in design, high capacity, low maintenance and operational cost. The separation action of a hydrocyclone treating particulate slurry is a consequence of the swirling flow that produces a centrifugal force on the fluid and suspended particles. In spite of hydrocyclone have many advantage, the application for treatment of urban stormwater case study were rare. We conducted a laboratory scale study on treatable potential of micro particles using hydrocyclone filter (HCF) that was a combined modified hydrocyclone with perlite filter cartridge. Since it was not easy to use actual storm water in the scaled-down hydraulic model investigations, it was necessary to reproduce ranges of particles sizes with synthetic materials. The synthesized storm runoff was made with water and addition of particles; ion exchange resin, road sediment, commercial area manhole sediment, and silica gel particles. Experimental studies have been carried out about the particle separation performance of HCF-open system and HCF-closed system. The principal structural differences of these HCFs are underflow zone structure and vortex finder. HCF was made of acryl resin with 120 mm of diameter hydrocyclone and 250 mm of diameter filter chamber and overall height of 800 mm. To determine the removal efficiency for various influent concentrations of suspended solids (SS) and chemical oxygen demand (COD), tests were performed with different operational conditions. The operated maximum of surface loading rate was about 700 $m^3/m^2$/day for HCF-open system, and 1,200 $m^3/m^2$/day for HCF-closed system. It was found that particle removal efficiency for the HCF-closed system is better than the HCF-open system under same surface loading rate. Results showed that SS removal efficiency with the HCF-closed system improved by about 8~20% compared with HCF-open system. The average removal efficiency difference for HCF-closed system between measurement and CFD particle tracking simulation was about 4%.

A Study on the Solid-Liquid Separation of Cooling Water in Ships (선박용 냉각수의 고.액분리에 관한 연구)

  • Choi, M.S.;Kim, J.H.;Jo, D.H.;Han, W.H.;Kim, B.G.
    • Journal of the Korea Society For Power System Engineering
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    • v.7 no.4
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    • pp.25-30
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    • 2003
  • Hydrocyclone has been widely used for the solid-Liquid separation in many industrial sites because of its comparatively preferable applications that can be applied to wide-range panicle sizes. If seawater with impurities flows through pumps or heat exchanger, it might cause an decrease in efficiency of cooling system. In this paper, we have suggested solid methods of separating impurities from seawater in the cooling system by using a Hydrocyclone. The effects of design factors as solid concentration, cyclone inlet pressure, flow rate and diameter of underflow on the seperating performance of the Hydrocyclone were investigated. The results from the study are summarized as follows: 1) In proportion to the increase of solid concentration, the efficiency of solid-liquid separation is improved. 2) According as the cyclone inlet pressure increases the efficiency of separation is improved. Conclusively, this research suggested that the Hydrocyclone will be used as a pre-treatment system of cooling water in ships, and eventually prevent unexpected accidents in engine systems.

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Simulation analysis on the separation characteristics and motion behavior of particles in a hydrocyclone

  • Xu, Yanxia;Tang, Bo;Song, Xingfu;Sun, Ze;Yu, Jianguo
    • The Korean Journal of Chemical Engineering
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    • v.35 no.12
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    • pp.2355-2364
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    • 2018
  • We evaluated the effect of particle size and associated dynamics on a hydrocyclone separation process in order to understand the movement of the particle trajectories inside the hydrocyclone via numerical analysis, with particles of acid hydrolysis residues discharged in $TiO_2$ production via the sulfate method as a case study. The values obtained from the numerical simulation were successfully compared with those from experimental tests in the literature, allowing a description of the dynamics of the particles, their acting forces, and their relevant properties together with separation efficiency. The results showed that particle motion is jointly controlled by the drag force, the pressure gradient force and the centrifugal force. With increasing particle size, the influence of the drag force is weakened, whereas that of the centrifugal force and pressure gradient is strengthened. Factors including particle density, slurry viscosity, and inlet slurry flow rate also contribute to a clear and useful understanding of particle motion behavior in the hydrocyclone as a method for improving the separation efficiency.

호소 퇴적물의 입자별 분리 및 오염특성 파악

  • 이홍수;최이송;오종민
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.409-412
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    • 2003
  • 본 연구는 호소내 오염된 퇴적물 처리를 위한 전처리 장치로 Hydrocyclone의 이용가능 성을 평가하는 실험이다. 외국의 선행 연구자인 Rietema의 표준 규격을 참고하여 제작된 Hydrocyclone을 이용하여 기흥저수지 퇴적물로 실험을 실시하였다. 실험결과 입자에 따른 오염 도 평가에서는 입자가 작을수록 포함된 오염물의 농도가 높은 것으로 나타났다. 또한 퇴적물을 이용한 장치특성 및 운전조건 변화에 따른 실험에서 공급속도가 빠르고, 공급시료의 농도가 낮으며, 장치의 크기가 작을수록 입자별 분리효율이 높았다.

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준설토의 농축 및 분리를 위한 Hydrocyclone의 적용가능성 평가

  • 오종민;조영민;노성혁
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.216-219
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    • 2001
  • In this study, a hydrocyclone operated by centrifugal force was examined as a part of dredge system of lake sediments. It does not help dehydration of the sediments, but also enables the classification of fine particles in the stable and sanitary treatment. Several experiments were performed focusing on the separation efficiency under the condition of room temperature with virtual sediment samples and simulated particles. As a result of the experiment, it was found that the apex size of the cyclone greatly affected the cut diameter(d$_{50}$), and high density particles were separated more effectively.y.

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CLASSIFICATION OF LAKE SEDIMENTS BY USING HYDROCYCLONES

  • Jo, Young-Min;Jang, Hyun-Tae
    • Proceedings of the Korean Environmental Health Society Conference
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    • pp.64-69
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    • 2001
  • The present work provides a result from the preliminary experiment for hydrocyclone technology. In this work, local lake sediments and waste coal fly ash were used as test samples, prior to the application of hydrocyclone technology to the waste sludge thickening. A few cyclones based on the Rietema standard geometry were prepared. Chemical analysis of the sediments showed that more organic contaminants were in smaller particles. The experimental tests further showed that physical characteristics of particles, configuration of the cyclone and operation condition would affect the separation efficiency. The current results showed that small size cyclones might improve the separation and concentration of the lake sediments, and higher inlet velocity would increase the concentration rate of under flow and absolute concentration of sediment particles.

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Numerical Study of Turbulent Flow in a Hydrocyclone (하이드로사이클론 내의 난류유동해석)

  • Ju, Jong-Il;Choi, Young-Seok;Lee, Yong-Kab;Kim, Tak-Hyun;Kim, sangyong
    • The KSFM Journal of Fluid Machinery
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    • v.6 no.2
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    • pp.34-40
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    • 2003
  • Numerical studies have been conducted to predict the solid-liquid separation efficiency of turbulent flow in a hydrocyclone using a commercial CFD code. To validate the CFD code, several preliminary numerical calculations are carried out to determine the influence of parameters such as grid systems, numerical schemes, and turbulence models. The numerical studies have been performed on the hydrocyclones with the different vortex finder geometries by changing the mass flow rate, and the results were compared with the experimental data. The results show that the CFD code can be used as a design tool to improve the performance of hydrocyclones.

Numerical Analysis of A Vortex Cyclone in A Recirculating Aquaculture System (순환여과 양식장에서 와류형 분리기에 대한 수치적 검토)

  • Jeong, S.K.;Kim, E.
    • Journal of the Korea Society For Power System Engineering
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    • v.9 no.1
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    • pp.36-41
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    • 2005
  • This study investigated the performance of a vortex hydrocyclone for solid removal in a recirculating aquaculture system. In a fish-breeding industry, effluent water is mainly disposed by gravity sedimentation. Thus, a large settling tank and a lot of water are needed to purify effluent water. However, this typical method does not show consistent efficiency. In case of low efficiency, discharged water contains a lot of feeding sediments. This causes environmental problems. Instead of this typical method a hydrocylone is tested to discharge water which contains a lot of feeding sediments. In this paper, a hydrocyclone with low velocity and pressure drop in a recirculating aquaculture system is investigated.

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Performance Analysis of a Hydrodynamic Separator for Treating Particulate Pollutants in Highway Rainfall Runoff

  • Yu, Jianghua;Yi, Qitao;Kim, Young-Chul
    • Environmental Engineering Research
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    • v.14 no.4
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    • pp.262-269
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    • 2009
  • This study examined the separation characteristics of particles in the rainfall runoff from paved roads using a ${\varphi}7.5$ cm hydrocyclone. The volume fraction and total suspended solids concentrations in the overflow and underflow from the hydrocyclone, as well as the separation efficiency were determined. The results indicated that the overflow volume increased with increasing operational pressure, but decreased with decreasing ratio of underflow outlet to inlet sizes ($D_u/D_i$), while the underflow to overflow volumes showed contrary behavior. The total suspended solid (TSS) concentration ratio between the overflow and inflow ($TSS_{over/in}$) decreased as a function of the operational pressure, while the corresponding ratio of underflow to inflow ($TSS_{under/in}$) increased. There was no visible difference in the $TSS_{over/in}$ with increasing $D_u/D_i$ ratio, but the $TSS_{under/in}$ decreased sharply. The particle removal efficiency was mainly affected by the particle size.