• Title/Summary/Keyword: Electro-Chemical Treatment

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Development of Electro-Chemical process for dyeing wasetewater treatment (전기산화반응을 이용한 염색폐수 색도제거 공정 기술개발)

  • Sin, Dong-Hun;Choe, Jang-Seung;Jo, Seok-Jin;Lee, Sang-Heon;Kim, Sun-Hyeon;Choe, Seong-Uk
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.10a
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    • pp.117-118
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    • 2008
  • The main objectives of this study are develop an Electro-Chemical process for dyeing wastewater treatment. In this work, We are investigated to optimization of electro-chemical process condition such as pH, additives(NaCl), reaction time, current density. As a result, About 89% of color(influent 452.5 ptco. unit) was removed by Electro-Chemical process using type C $SnO_2$ electrode. This results are promising potential for dyeing wastewater treatment.

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Study on Electro spinning Voltage and Strength Characteristics Using Agitation Solution (SWCNT 0.1% -PAN 3% -DMF 17%) (SWCNT 0.1%-PAN 3%-DMF 17% 교반용액을 활용한 전기방사 전압 및 강도특성연구)

  • Lee, Jongyeob;Bae, Sangdae;Kim, Kwonhoo
    • Journal of the Korean Society for Heat Treatment
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    • v.33 no.6
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    • pp.290-295
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    • 2020
  • In this study, Electro spinning was carried out using Cabon nanotube 0.1%-Polyacrylonitrile 3%-Dimethylformamide 17% agitation solution. It was investigated the solute and solvent correlations according to the electro spinning voltages ranging form 5 to 40 kV, based on the SEM image. Except voltage 25 kV, electro spinning was failed due to the lack of electro spinning (less than 60%). Voltage 25 kV was showed excellent properties, and was confirmed Cabon nanotube 58.1 nm and diameter of Cabon nanotube + Polyacrylonitrile 1.76 ㎛ as shown SEM image. Also, the tensile test results were showed that SK Chemical prepreg electro spinning angle of 0 and 90 degrees were 137 MPa and 60 MPa, respectively.

Study of Wastewater Treatment in the Continuous Electro-Coagulation Plug Flow Reactor after Ozone Treatment (오존처리수의 전기응집처리 연구)

  • 박영규
    • Journal of environmental and Sanitary engineering
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    • v.16 no.2
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    • pp.1-8
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    • 2001
  • The water treatment by electrochemical method was performed to increase the yield of production. Continuous plug flow reactor was operated to treat poultry and domestic wastewaters. Experimental results were compared with experimental results of the wastewater treatment by chemical coagulation, they were increased over 10% in the removal efficiency of COD and the production rate of sludge was reduced by 30%. Ozone utilized to degrade or change the organic chemical structures, which removal efficiency increased to 20% in the electro-coagulation reactor. Economic evaluation was performed to estimate total cost of electro-coagulation reactor in comparison with that of chemical coagulation method. The total cost to treat 1000 ton/day of domestic wastewater was reduced by 50%.

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A experimental study about plasma ion treatment to improve hardness of electro-polished surface (전해연마면의 표면경도 향상을 위한 플라즈마 이온질화 처리법에 관한 실험적 연구)

  • Kim, Jin-Beom;Hong, Pil-Gi;Seo, Tae-Il;Son, Chang-Woo
    • Design & Manufacturing
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    • v.13 no.1
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    • pp.13-18
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    • 2019
  • The size and prospects of the domestic semiconductor equipment market are increasing every year. In the case of various parts used inside semiconductor equipments, high durability such as high strength and abrasion resistance is demanded. Particularly, the gases used in semiconductor production processes are toxic. In order to prevent such toxic gas leakage, a precision processing technique and a surface treatment technique for preventing corrosion are required. Electro-polishing is an electro-chemical method of polishing a metal surface to make it smooth and polished. Electro-polishing is mainly used in the finishing process of metal surface. Unlike mechanical polishing, electro-polishing is used in many fields, such as fine chemical etching equipment, since no damaged layer or burr, fine polishing groove and particles are generated. However, in order to withstand the gas used in the semiconductor equipment, the parts must have high corrosion resistance. However, the surface hardness generally become lowered through electro-polishing. Therefore, in this study, surface hardness were experimentally observed before and after electro-polishing. Then, a method of improving hardness by preparing a nitrided layer by plasma ion nitriding treatment.

Photo and Electrocatalytic Treatment of Textile Wastewater and Its Comparison

  • Singaravadivel, C.;Vanitha, M.;Balasubramanian, N.
    • Journal of Electrochemical Science and Technology
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    • v.3 no.1
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    • pp.44-49
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    • 2012
  • Electrochemical and photochemical techniques have been proved to be effective for the removal of organic pollutants in textile wastewater. The present study deals with degradation of synthetic textile effluents containing reactive dyes and assisting chemicals, using electro oxidation and photo catalytic treatment. The influence of various operating parameters such as dye concentration, current density, supporting electrolyte concentration and lamp intensity on TOC removal has been determined. From the present investigation it has been observed that nearly 70% of TOC removal has been recorded for electrooxidation treatment with current density 5 mA/$dm^2$, supporting electrolyte concentration of 3 g/L and in photocatalytic treatment with 250 V as optimum lamp intensity nearly 67% of TOC removal was observed. The result indicates that electro oxidation treatment is more efficient than photocatalytic treatment for dye degradation.

Chemical Vapor Deposition Polymerization of Poly(arylenevinylene)s and Applications to Nanoscience

  • Joo, Sung-Hoon;Lee, Chun-Young;Kim, Kyung-kon;Lee, Ki-Ryong;Jin, Jung-Il
    • Bulletin of the Korean Chemical Society
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    • v.27 no.2
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    • pp.169-184
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    • 2006
  • A review is made on the chemical vapor deposition polymerization (CVDP) of insoluble and infusible poly(arylenevinylene)s and its applications to nanoscience. Poly(p-phenylenevinylene) (PPV), poly(naphthylenevinylene)s, poly(2,5-thinenylenevinylene) (PTV), and other homologous polymers containing oligothiophenes could be prepared by the CVDP method in the form of films, tubes, and fibers of nano dimensions. They would be readily converted to graphitic carbons of different structures by thermal treatment. Field emission FE) of carbonized PPV nanotubes, photoconductivity of carbonized PPV/PPV bilayer nanotubes and nanofilms also were studied.

Study on the Effect of Surface Finishing Methods on Pitting Corrosion Behavior of 304 Stainless Steel Alloy

  • Yun, JunTae;kim, Se-Woong;Hwang, HyangAn;Toor, Ihsan-Ul-Haq;Shon, MinYoung
    • Corrosion Science and Technology
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    • v.8 no.6
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    • pp.209-216
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    • 2009
  • In this study the effect of different surface finishing techniques on the pitting corrosion behaviour of a commercial 304 stainless steel alloy was investigated. Surface finishing methods were divided into two categories, i.e. mechanical and chemical. Mechanical treatment methods include power tooling such as grinding, emery paper brushing, stainless steel wire brushing and stainless steel shot blasting. Chemical treatment methods include chemical passivation (phosphoric acid, citric acid, nitric acid) and electro-cleaning (phosphoric acid and citric acid). Potentiodynamic polarization experiments were carried out in 3.5 wt. % NaCl solution at room temp. (20 $^{\circ}C$). The results showed that chemical treatment methods improved the corrosion resistance of stainless steel 304, measured in terms of pitting potential ($E_{pit}$). Corrosion resistance of the specimens was increased in the order of; electro-cleaning > manual passivation > mechanical cleaning. Surface of electro-cleaned specimens was smoother than rest of the surface treatment methods. Chrome content in chemically treated specimens was higher than in mechanically treated specimens as shown by EDX analysis.

Control of Nano-Scaled Surface Microstructure of Al Sample for Improving Heat Release Ability (Al 소재의 방열특성 향상을 위한 미세조직 제어 연구)

  • Yeo, In-Chul;Kang, In-Cheol
    • Journal of Powder Materials
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    • v.22 no.1
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    • pp.21-26
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    • 2015
  • In this study, the control of microstructure for increasing surface roughness of Al with an electro-chemical reaction and a post treatment is systematically investigated. The Al specimen is electro-chemically treated in an electrolyte. In condition of the post treatment at $100^{\circ}C$ for 10 min, a change of the surface microstructure occur at 50V (5 min), and a oxidized layer is at 400V, to which lead a decreasing surface roughness. The minimum temperature of the post treatment for a change of microstructure is $80^{\circ}C$. Moreover, in the condition of 300V (5 min), the electro-chemical reaction is followed by the post treatment at $100^{\circ}C$, the critical enduring time for the change of microstructure is 3 min. The longer post treatment time leads to the rougher surface. The treated Al specimen demonstrate better heat release ability owing to the higher surface roughness than the non-treated Al.

Modeling and Optimization of High Strength Wastewater Treatment Using the Electro Oxidation Process (전기산화공법을 이용한 고농도폐수 처리공정의 모델링 및 최적화)

  • Lee, Hongmin;Lee, Sangsun;Hwang, Sungwon;Jin, Dongbok
    • Korean Chemical Engineering Research
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    • v.54 no.3
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    • pp.340-349
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    • 2016
  • Electro oxidation system was designed in this study for the reduction of COD (Chemical Oxygen Demand) from high-strength wastewater, produced during refinery turnaround period. First, BDD (Boron Doped Diamond) electrode was synthesized and electro oxidation system of actual industrial wastewater was developed by adopting the synthesized BDD electrode. The experiments were carried out under various operating conditions under certain range of current density, pH, electrolyte concentration and reaction time. Secondly, reaction kinetics were identified based on the experimental results, and the kinetics were embedded into a genetic mathematical model of the electro oxidation system. Lastly, design and operating parameters of the process were optimized to maximize the efficiency of the pretreatment system. The coefficient of determination ($R^2$) of the model was found to be 0.982, and it proved high accuracy of the model compared with experimental results.

A Study on the Effect of Non-martensitic Layer on the Fatigue Strength in Carburized Gears (첨탄기어의 피로강도에 미치는 표면이상층의 영향에 관한 연구)

  • 류성기;박준철
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.2
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    • pp.357-364
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    • 2001
  • This study deals with the effect on non-martensitic layer on the fatigue strength in carburized gear. The test gears are carburized, then treated by the combination of chemical polishing and electro-polishing. Carburization treatment is used widely on parts of power transmission system like surface hardened layer to improve fatigue strength. Carburized gears are observed using a scanning electron microscope(SEM) to determine the characteristics of crack initiation mechanism in the surface layer. The constant street amplitude fatigue test is performed by using and electro-hydraulic servo-controlled pulsating tester. The S-N curves are obtained and illustrated. The effect of non-martensitic layer on the fatigue strength is clarified.

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