Electrochemical denitrificaton of simulated ground water

Dash, Barsha; Chaudhari, Sanjeev

doi:10.1016/j.watres.2005.07.032

Cited by 186 publications

(80 citation statements)

References 23 publications

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“…(1) and (2)). The high pH along with almost constant TN concentration of electrolyzed effluent water recommends that NO 3 -was mainly transformed into NO 2 -and NH 3 according to the equations (1) and (2) in the cathode chamber [6]. Fig.…”

Section: B Influence Of Volumetric Electric Charge and Flow Rate On mentioning

confidence: 94%

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Influence of Operational Parameters on Rapid Nitrate Removal Using an Electrochemical Flow Cell

Ashadullah¹,

Kishimoto²

2016

IJESD

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Abstract-Nitrate contamination is a great concern all over the world. However, the conventional biological processes like the modified Ludzack-Ettinger process are time-consuming. Accordingly, a rapid process for nitrate removal is desired. We conceived an electrochemical process for rapid removal of nitrate, which contained electrochemical reduction of nitrate to ammonia and electrochemical break-point chlorination of ammonia. In this research, we investigated effects of operational parameters such as volumetric electric charge, flow rate and chloride ion concentration on electrochemical nitrate removal. A hand-made divided flow cell with a copper mesh cathode, a platinum-coated titanium anode and a cation exchange membrane as a separator was developed as well as applied to the treatment of synthetic water containing 1.42 mM of nitrate at various volumetric electric charges, flow rates and chloride ion concentrations. As a result, it was observed that the flow cell operated at a flow rate of 20 mL/min, chloride ion concentration of 800 mg/L, volumetric electric charge of 5,100 C/L and at pH 7 successfully removed nitrate from 1.42 mM to 0.43 mM without ammonia and nitrite accumulation within 1 minute contact time. Consequently, the electrochemical technique was thought to be feasible for the rapid removal of nitrate from water streams.Index Terms-Break-point chlorination, biological process, electrochemical process, nitrate contamination.

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Section: B Influence Of Volumetric Electric Charge and Flow Rate On mentioning

confidence: 94%

“…In the last decades, numerous cathode materials were studied by several researchers in the electrochemical denitrification such as, Cu, Fe, Zn, Pt/Ir, Pd and Au [5]. Some electrodes like Cu and Fe presented quite efficient promoters for NO 3 -reduction [6].…”

Section: A Electrochemical Water Treatment Conceptsmentioning

confidence: 99%

Influence of Operational Parameters on Rapid Nitrate Removal Using an Electrochemical Flow Cell

Ashadullah¹,

Kishimoto²

2016

IJESD

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“…Kinetics studies have important role in determining the rate constant and the order of reaction of this treatment removal [45]. So, rate constant is very significant in the design of wastewater treatment units.…”

Section: Kinetic Studiesmentioning

confidence: 99%

Removal of Imidacloprid Pesticide by Electrocoagulation Process using Iron and aluminum Electrodes

Ghalwa¹

2015

J Environ Anal Chem

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“…According to the World Health Organization (WHO) recommendations, the maximum allowable concentration of nitrate in drinking water is 50 mg/L (7). Various methods for nitrate elimination were reported such as ion exchange, biological treatment, reverse osmosis, chemical reduction, and electrochemical processes (7)(8)(9). These conventional technologies have some disadvantages such as generating a large amount of intermediates, which require further treatment, continuous monitoring, and slow kinetics rate (8)(9)(10)(11).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Hossini

Rezaee

2014

Health Scope

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Background:The presence of nitrate and its intermediates are considered undesirable compounds in the environment. Various methods have been proposed to remove nitrate from wastewater and water streams. Objectives: In this study, we investigated removal of nitrate from an aqueous solution by the process of electrocoagulation, using aluminum/graphite as the anode/cathode electrodes. Materials and Methods:We applied response surface methodology (RSM) as the statistical method for modeling, and optimizing the applied variables. All experiments were performed according to the standard methods for the examination of water and wastewater. To prepare the optimum condition, we considered the following amount of compounds and conditions: NaCl, 1 g/L; nitrate concentration range, 50-200 mg/L; applied electric current range, 0.05-0.2 A; anode, aluminum; cathode, graphite; and detention time: 120 minutes. Results:The results showed that by applying electric current of 0.14 A for 120 minutes, the nitrate content would reduce down to 97%. The obtained R 2 for the nitrate removal model was higher than 0.99. With regard to supporting electrolytes, more nitrate reduction is obtained with NaCl. The oxidation reduction potential (ORP) was changed from 220 to -375 mV and this range is suitable for denitrification and nitrate reduction. Conclusions:The results of this study show that it is possible to remove nitrate, and its intermediates from waste water. Regarding the desirability of the process, the field scale study is proposed.

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Electrochemical denitrificaton of simulated ground water

Cited by 186 publications

References 23 publications

Influence of Operational Parameters on Rapid Nitrate Removal Using an Electrochemical Flow Cell

Influence of Operational Parameters on Rapid Nitrate Removal Using an Electrochemical Flow Cell

Removal of Imidacloprid Pesticide by Electrocoagulation Process using Iron and aluminum Electrodes

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

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