41-50. Two types of distinct mechanisms were observed, one involving particle destabilization by oppositely charged ferrous ions and the other involving coprecipitation or enmeshment of silica particles with the iron hydroxides. Electrocoagulation History Electrocoagulation “EC” was discovered in the early 1900‘s and … Due to chemical production of aluminium at the cathode, the concentration of aluminium in the water at the outlet of the electrochemical reactor is much higher than the one calculated according to Faraday's law. The ratio mgl-1 Al3+ dosed /mgl-1 silica removed ranged from 1.09 ± 0.06 to 1.33 ± 0.05 when treating RW and 0.85 ± 0.1 when treating CTBW. This study investigates the results of electrocoagulation (EC) using aluminum (Al) electrodes as anode and stainless steel (grade 316) as a cathode for removing silica, calcium, and magnesium ions from simulated cooling tower blowdown waters. The optimal conditions are current density 144.06 A/m2, retention time 25.95 s, and pH value 7.29, resulting in silica concentrations in the treated effluent below 5 mg/L. BIBLAT Bibliografía Latinoamericana en revistas de investigación científica y social. Removal of silica is usually done as a means of preventing wear and damage to equipment. Silica is capable of forming scale deposits on surfaces in various water applications. silica removal using sodium aluminate. Background: Eagle Cement, a San Miguel group company, was having continuous blockages in their chillers due to Silica scaling. 2) 27 lb / d of sludge from the Ferric Hydroxide Box 818, 407 Taichung, Taiwan, Republic of China aluminium electrodes in an continuous, flocculator like, electrocoagulation reactor designed to remove silica from water. EEC for Leachate in China EEC for Silica removal at Eagle Cement in the Philippines B4 EEC treatment 180 ppm Silica after EEC Silica removed to 8 ppm. GWT electrocoagulation solutions have been instrumental in the treatment of the following contaminants: Oxidation of Organics such as Arsenic. An innovative, economical and efficient method of silica removal from waters Lime softening. Contact Us 281-339-5400 Scale deposits will reduce the efficiency of heating and cooling and interfere with the ability to operate systems within a defined pressure range. The response variables analyzed were: efficiency of aluminum to remove silica (ratio mgl-1 of dosed Al3+/mgl-1 SiO2 removed), removal efficiency of dosed Al3+, hydraulic head loss throughout the electrochemical reactor and voltage. The technology is also effective for the treatment of oily water to remove turbidity, colour and silica. In addition, temperature and settle time showed effects on silica removal. Electrocoagulation (EC), the passing of electrical current through water, has proven very effective in the removal of contaminants from water. Vol. Electrocoagulation: Effective Treatment of Silica Removal from Water. 3, May-June, 2014, pp. A novel current feed style, alternating pulse current, was proposed in electrocoagulation aiming at preventing the passivation A.H. Lundberg is partnering with electrocoagulation vendors to solve the challenges faced by the oil & gas industry in treating wastewater. In those cases, electrocoagulation provides an excellent pre-treatment technology to remove contaminants prior to reverse osmosis to prevent blinding of the membrane. - "Electrocoagulation for removal of silica nano-particles from chemical–mechanical-planarization wastewater" Electrocoagulation is found to be very efficient to remove dissolved Si from approximately 60 mg/L to less than 5 mg/L, corresponding to greater than 90% Si removal. Share on facebook. ABSTRACT: This study investigated the performance of electrocoagulation using iron and aluminum electrodes for removing silica, calcium and magnesium from cooling tower blowdown and reverse osmosis reject waters. For our purposes, a current density of j=38 A/m2 was selected in scaling up an electrocoagulation unit as at this current density a good silica removal is reached, the electrodes could be totally consumed without an important increase in voltage and they kept free of deposits. During electrocoagulation or chemical coagulation, some dissolved metals and metalloids species will co-precipitate or adsorb onto the surface of the hydroxylated coagulants. The removal efficiency of silica by zinc sulfate was higher than that by general coagulants such as aluminum and ferric salts. The major contaminant targeted is dissolved silica, which is the cause of the scaling problem in the steam generators in the oil-sands production process. The presence of chlorine in water raised considerably th e iron removal efficiency, but did not affect the iron production. Introduction In the past 10 years, electrochemical processes have received renewed interest as an alternative treatment method for industrial wastewater containing dispersed charged particles without chemical additions. production and in removing the formed flocs. The consumption costs of energy, chemicals and electrodes for RW treatment ranged from US$ 0.52 to 0.74 m-3, and was approximately US$0.53 m-3 for CTBW. V, No. At pH values of above 10, the mild steel anodes immediately passivated and were not able to deliver Fe2+ ions into the solution. B. By removing the color, suspended solids and silica, the water is of sufficient quality for reus Metal Plating: Metal platers use electrocoagulation to remove metals from the plating rinse water tank, enabling them to reuse the remediated water as process water. 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