• Title/Summary/Keyword: electrocoagulation

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Comparison of Electrocoagulation and Chemical Coagulation in Removal on Water Treatment (정수처리에서 전기응집과 화학응집의 처리효율 비교)

  • Han, Moo-Young;Song, Jae-Min;Park, Sang-Cheol
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.5
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    • pp.689-695
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    • 2004
  • Electrocoagulation has been suggested as a promising alternative to conventional coagulation. The process is characterized by reduced sludge production, no requirement for chemical use, and ease of operation. However, this coagulation has scarcely been studied in water purifying process. This study was performed several batch experiments to compare turbidity removal between electrocoagulation and chemical coagulation. In addition, characteristics of floe were evaluated with zeta potential and particle size distributions. Electrocoagulation showed a relatively higher removal of turbidity (approximately 5%) with the same aluminum amount than conventional chemical coagulation. In addition, turbidity removal by electrocoagulation was less sensitive to pH and was greater for more extensive pH range than chemical coagulation. The results of zeta potential and floc size distributions illustrated that electrocoagulation provided the preferable conditions for coagulation such as zeta potential close to zero millivolt and increased portions of particles in the range of 40 and $100{\mu}m$.

TiO2 Removal using Electrocoagulation-electroflotation Two-step Process (전기응집-전기부상 2단계 공정을 이용한 TiO2 제거)

  • Dong-Seog Kim;Young-Seek Park
    • Journal of Environmental Science International
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    • v.32 no.5
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    • pp.385-394
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    • 2023
  • There is a need for a method that can effectively remove wastewater containing small-sized particles such as TiO2. In this study, we attempted to remove TiO2 wastewater using electrocoagulation-electroflotation two-step separation. The TiO2 wastewater was effectively removed via batch electrocoagulation-electroflotation separation. However, in the batch process, the simultaneous operation of electrocoagulation and electoflotation was challenging due to the high residual turbidity. In the continuous operation, electrocoagulation and electoflotation reactors were kept separate. The turbidity removal in continuous operation was similar to that in the batch process, nevertheless, the residual Al concentration was high, leading to the conclusion that counterterm ensures against residual Al were necessary.

Performance Evaluation of Electrocoagulation and Electrodewatering for the Reduction of Water Content in Wastewater Sludge (전기응집 및 탈수 시스템을 이용한 슬러지 함수율 저감 특성)

  • 이재근;김영환;신희수
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.5
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    • pp.1098-1107
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    • 2001
  • This study is to develop the pretreatment for the excess and digested sludge by elector-coagulation and dewatering. Electrocoagulation is applied to excess and digested sludge before transferring to the pistion type for dewatering. Piston type filter press as a laboratory scale plant was used to estimate the dewaterability. MMD of excess sludge was increased from initial diameter of particles ($34.16{\mu}m$) to the 87%($64.01{\mu}m$) after electrocoagulation. Al electrode is more effective than Fe electrode for the dewaterabiltity of excess sludge Electrodewatering after electrocoagulation as pretreatment makes the water content of sludge cake 50~60 wt%.

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Design and Performance Evaluation of Sludge Dewatering System based on Electrocoagulation and Electroosmosis (전기응집 및 전기탈수을 이용한 슬러지 탈수 성능평가 분석)

  • Shin, Hee-Soo;Yeo, Chang-Sin;Byun, Sang-Hyun;Lee, Jae-Keun
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1992-1997
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    • 2003
  • This study is to develop the pretreatment for the excess and digested sludge by electro-coagulation and dewatering. Electrocoagulation is applied to excess and digested sludge before transferring to the piston type press for dewatering. Piston type filter press as a laboratory scale plant was used to estimate the dewaterability. MMD of excess sludge was increased from initial diameter of particles(34.16 ${\mu}m$) to the 87%(64.01 ${\mu}m$) after electrocoagulation. AI electrode is more effective than Fe electrode for the dewaterability of excess sludge. Electrodewatering after electrocoagulation as pretreatment makes the water content of sludge cake $50{\sim}60$ wt%.

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The Investigation of COD Treatment and Energy Consumption of Urban Wastewater by a Continuous Electrocoagulation System

  • DEDE SAGSOZ, Yesim;YILMAZ, Alper Erdem;EKMEKYAPAR TORUN, Fatma;KOCADAGISTAN, Beyhan;KUL, Sinan
    • Journal of Electrochemical Science and Technology
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    • v.13 no.2
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    • pp.261-268
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    • 2022
  • In this study, electrochemical treatment of urban wastewater with electrical conductivity of 1000 μS cm-1 and chemical oxygen demand of 250 mg L-1 was investigated using the variables of initial pH value, current density and flow rate. Electrocoagulation was used, in which aluminum and stainless steel were selected, as the electrochemical treatment process. The electrocoagulation process was operated in continuous mode. The data obtained in experimental studies show that the best COD removal efficiency occurred in experiments where the initial pH value was 6. The increase in current density from 5 A to 15 A decreased the removal efficiency from 79 to 67%. The increase in flow rate under constant current density also reduced the efficiency of removal as expected. In experiments in which current density and flow rate were examined together, the increase in flow rate allowed the application of higher current densities. This situation led to considerable reductions in energy consumption values, even if the COD removal efficiency did not significantly increase. The high COD removal obtained with the use of high flow rate and high current density indicates that the electrocoagulation process can be used for high flow rate municipal wastewater treatment.

Turbidity Treatment of TiO2 Wastewater by Electrocoagulation/flotation Process (전기응집/부상 공정을 이용한 TiO2 폐수의 탁도 제거)

  • Park, Young-Seek
    • Journal of Environmental Science International
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    • v.19 no.1
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    • pp.89-96
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    • 2010
  • The separation of $TiO_2$ wastewater carried out by an electrocoagulation/flotation process, which had various operating parameters. The effect of electrode material (aluminum and four dimensionally stable electrode), applied current (0.07~0.5 A), electrolyte concentration (0~1 g/L), solution pH (3~11), initial turbidity (1000~20000 NTU) and suspended solid concentration (5000~25000 mg/L) were evaluated. Turbidity removal efficiency of the soluble anode (aluminum), which could produce metal ions, was higher than that of the dimensionally stable electrode. Considering operation time, turbidity removal and electric power, optimum current was 0.19 A. The more NaCl dosage was high, the less electric power was required. However, optimum NaCl concentration was 0.125 g/L considered removal efficiency, operation time and cost. Initial $TiO_2$ concentration did not affected turbidity removal on the electrocoagulation/flotation operation. The electrocoagulation/flotation process was proved to be a very effective separation method in the removal of $TiO_2$ from wastewater.

The Treatment of Textile Wastewater by Electrocoagulation Process (전해응집공정을 이용한 염색폐수의 처리)

  • 이용택;한승우;조영개;이현문;김태근;손인식;양병수
    • Journal of Environmental Science International
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    • v.9 no.4
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    • pp.359-363
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    • 2000
  • This research studied the characteristics and applicability of electrocoagulation using aluminium electrode for the color and COD removal in textile wastewater. Electrocoagulation reactor used two different electrode, Fe and Al, since in the general chemical wastewater treatment, aluminium and ferrous salts were used as coagulants. Aluminium electrode showed higher removal efficiency of color and COD than ferrous electrode did. The COD and color removal efficiency improved at the 0.192A/$dm^2$ current density. Thus, the electrocoagulation process with bipolar aluminium electrode showed better efficiency in the decolorization and COD removal rate of textile wastewater effluent than custom coagulants did.

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Treatment of a dye solophenyle 4GE by coupling electrocoagulation / nanofiltration

  • Djahida, Zerrouki;Amel, Benhadji;Mourad, Taleb Ahmed;Hayet, Djelal;Rachida, Maachi
    • Membrane and Water Treatment
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    • v.5 no.4
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    • pp.251-263
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    • 2014
  • The study contributes in the treatment of waste generated by the textile complex cotton of Draa Ben Khedda, Algeria. The azo dye "Direct Red Solophenyle 4GE" represents the base particle of the discharges and electrocoagulation with nanofiltration are used as a means of treatment. The solar photovoltaic is suitable for electrochemical process to reduce the energy cost. Several study parameters are considered in this work. The electrocoagulation batch gives the best reduction 37% for a dye concentration of 7.21 mg/L ($[NaCl]_{added}$=1g/L; $j=25.2mA/cm^2$). Coupling methods (electrocoagulation-nonofiltration) gives a complete discoloration rejecting concentration 52.4 mg/L (pHi = 7.6, $[NaCl]_{added}$=3g/L, $j=2.13mA/cm^2$). The result shows the coupling efficiency with a reduced amount of resulting slurry at the end of treatment.

Analysis of Electrocoagulation Process using Faraday's Law (Faraday's Law에 의한 전기응집공정의 분석)

  • Kim, Hye-Sook;Yun, Young-Im;Cho, Eun-Jeong;Choi, Yun-Hee;Oh, Mi-Young;Kim, Yeong-Kwan
    • Journal of Industrial Technology
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    • v.21 no.A
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    • pp.351-355
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    • 2001
  • This research was carried out to find out the possibility of using Faraday's law in analyzing the electrocoagulation system. Bench-scale reactor equipped with aluminum electrode plates was operated using synthetic wastewater which received sodium chloride for conductivity adjustment. Phosphate was added to the wastewater to induce the precipitation with Al. The amount of aluminum dissolved from the electrodes could be predicted by Faraday's law with a difference less than 5%. This difference was greater at a higher electric current, probably due to the increased solution temperature. However, effect of pH on the dissolution of the aluminum was negligible. The result of this study suggested that the operating condition of electrocoagulation system could be developed using the Faraday's law when the pollutant concentration is given.

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Removal of Hydrogen Fluoride from Waterjet Plasma Wastewater by Electrocoagulation (전해응집법에 의한 불화수소 함유 워터젯 플라즈마 폐수처리)

  • Lee, Chae Hong;Chun, Young Nam
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.10
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    • pp.702-708
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    • 2012
  • Tetrafluoromethane ($CF_4$) has been used as etching and Chemical Vapor Deposition (CVD) gases for semiconductor manufacturing processes. These gases need to be removed efficiently because of their strong absorption of infrared radiation and long atmospheric lifetimes which cause the global warming effect. Also, the wastewater including the fluorine is caused by of the ground water pollution. Long-term consumption of water containing excessive fluoride can lead to fluorosis of the teeth and bones. The wastewater including the fluorine among the by-product which is generated by using the waterjet plasma after destroying $CF_4$ by HF is generated. The system which can remove the hydrogen fluoride among the wastewater by using the electrocoagulation using this wastewater the aluminum electrode was developed. The operating condition such as initial pH, electrocoagulation time, wastewater flow rate, current density were investigated experimentally using a electrocoagulation. Through the parametric studies, the highest hydrogen fluoride destruction of 85% was achieved at 3.5 initial pH, 10 min electrocoagulation time, 10 mL/min wastewater flow rate and $159A/m^2$ current density.