Removal of Cadmium by Electrocoagulation and a Cost Evaluation

Q3 Environmental Science

Ekoloji Pub Date : 2012-12-31 DOI:10.5053/EKOLOJI.2012.853

A. Yılmaz, S. Bayar, R. Boncukcuoğlu, B. A. Fil

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引用次数: 12

Abstract

The electrocoagulation method was selected for the removal of Cd+2. The effects of the parameters such as current density, pH, and supporting electrolyte concentration on this method were studied. The Cd+2 concentration, stirring speed, and temperature were 250 mg/L, 150 rpm, and 293 K in the determination of the optimum pH. The results obtained showed that a pH of 6 provided the highest Cd+2 removals. A pH of 6 was taken to be a constant optimum value while studying the effects of current density and supporting electrolyte concentration on removal. Current density values were chosen as 0.25, 0.50, 1.00, and 1.50 mA/cm 2 . Increasing current density increased Cd +2 removals significantly. Removal of 58%, 85%, 95%, and 99% were found for current densities of 0.25, 0.50, 1.00, and 1.50 mA/cm2 with an initial concentration of 250 mg/L with a reaction time of 30 minute, respectively. An increase in current density caused an extreme increase in energy consumption. Energy consumption was 0.363 kW-h/m3 for a current density of 0.25 mA/cm2 with a reaction time of 30 minutes while it was 1.575, 3.85, and 7.51 kWh/m3 for a current density of 0.50, 1.00 and 1.50 mA/cm2 at a pH of 6, respectively. It was found that the effect of supporting electrolyte concentration on removal efficiency was negative. As supporting electrolyte concentration increased, removal efficiency decreased and the energy consumption rate increased. It was determined, as a the result of the experiments, that Cd +2 ions can be removed at the rate of 99% with a pH of 6, a 250 mg/L Cd+2 concentration, a 150 rpm stirring speed, a temperature of 293 K and a current density of 1.50 mA/cm2 in an aqueous solution.

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电絮凝法去除镉及其成本评价

选择电絮凝法去除Cd+2。研究了电流密度、pH、电解质浓度等参数对该方法的影响。Cd+2的最佳去除率分别为:浓度为250 mg/L、转速为150 rpm、温度为293 K。结果表明，pH为6时Cd+2去除率最高。研究了电流密度和负载电解质浓度对去除率的影响，以pH 6为恒定的最佳值。电流密度值分别为0.25、0.50、1.00和1.50 mA/ cm2。增大电流密度可显著提高Cd +2去除率。当电流密度为0.25、0.50、1.00和1.50 mA/cm2，初始浓度为250 mg/L，反应时间为30分钟时，去除率分别为58%、85%、95%和99%。电流密度的增加引起了能量消耗的急剧增加。当电流密度为0.25 mA/cm2、反应时间为30 min时，能耗为0.363 kW-h/m3;当电流密度为0.50、1.00和1.50 mA/cm2、pH = 6时，能耗分别为1.575、3.85和7.51 kWh/m3。结果表明，负载电解质浓度对去除率的影响为负。随着载体电解质浓度的增加，去除率降低，能耗增加。实验结果表明，在pH为6、Cd+2浓度为250 mg/L、搅拌速度为150 rpm、温度为293 K、电流密度为1.50 mA/cm2的水溶液中，Cd+2离子的去除率可达99%。

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来源期刊

Ekoloji 环境科学-生态学

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Cessation. Ekoloji is an international journal that focuses on papers that report results from original research on all disciplines engaged in the field of environmental research. We welcome articles that cover the entire spectrum of environmental problems and environmental pollutants, whether chemical, biological or physical. Its coverage extends to all environmentally related issues: air and water pollution, solid waste, noise, recycling, natural resources, ecology and environmental protection. It includes articles on basic and applied environmental pollution research, including environmental engineering and environmental health. All types of pollution are covered, including atmospheric pollutants, detergents, fertilizers, industrial effluents, metals, mining wastes, oil, pesticides, plastics, radioactive materials and sewage. It also includes research papers on ecological and environmental issues such as climate change, biodiversity. The primary criteria for publication are scientific quality and ecological/environmental significance. The journal will be read and contributed to by biologists, applied ecologists, environmental scientists, natural resource specialists, environmental engineers, environmental health specialists, agro-ecologists, veterinaries, agricultural engineers, landscape planners and designers. The journal welcomes full "research papers" and short "research notes", only in the English language.