Efficient electrochemical reduction of nitrate to nitrogen using Ti/IrO2–Pt anode and different cathodes

Li, Miao; Feng, Chuanping; Zhang, Zhenya; Sugiura, Norío

doi:10.1016/j.electacta.2009.03.064

Cited by 229 publications

(106 citation statements)

References 42 publications

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“…(f) it is found that when the effluent pH was adjusted at 5, 7 and 9 the NH 4 + and chloramines were complete oxidized at the volumetric electric charge of 5,100 C/L at pH 7.These results confirm that the appropriate amount of Cl -lead sufficient amount of HOCl production, which could oxidize the NH 3 and other byproduct presumably into N 2 [9]. Also, it should be noted that the NH 3 formation rate increased with the increase in volumetric electric charges as shown in Figure 3 (a).…”

Section: Influence Of Chloride Ion Concentration On Reduction Of Nsupporting

confidence: 73%

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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: Influence Of Chloride Ion Concentration On Reduction Of Nsupporting

confidence: 73%

“…Therefore, it is challenging to find out the appropriate conditions to perform both cathodic reduction of NO 3 -and anodic oxidation of the produced NH 3 [9].…”

Section: B No 3 -Conversion Mechanism In An Electrochemical Flow Cellmentioning

confidence: 99%

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

Ashadullah¹,

Kishimoto²

2016

IJESD

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“…Lastly, electrochemical reduction is a non-biological nitrate removal mechanism that may occur in a BER (Li et al, 2009). This mechanism involves the change in oxidation state of nitrogen from nitrate to nitrite, nitric oxide, nitrous oxide, and eventually to nitrogen gas.…”

Section: Theorymentioning

confidence: 99%

Electrical stimulation for enhanced denitrification in woodchip bioreactors: Opportunities and challenges

Law

Soupir

Raman

et al. 2018

Ecological Engineering

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Woodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification efficiency of electrically augmented woodchip bioreactors and conduct a simple techno-economic analysis (TEA) to understand the possibilities and limitations for full-scale BER implementation for treatment of agricultural drainage. Up-flow column woodchip bioreactors were studied included two controls (non-energized, and without electrodes), two electrically enhanced bioreactors, each using a single 316 stainless steel anode coupled with graphite cathodes, and two electrically enhanced bioreactors, each with graphite for both anode and cathodes. Both pairs of electrically enhanced bioreactors demonstrated higher denitrification efficiencies than controls when 500 mA of current was applied. While this technology appeared promising, the technoeconomic analysis showed that the normalized N removal cost ($/kg N) for BERs was 2-10 times higher than the base cost with no electrical stimulation. With our current reactor design, opportunities to make this technology cost effective require denitrification efficiency of 85% at 100 mA. This work informs the process and design of electrically stimulated woodchip bioreactors with optimized performance to achieve lower capital and maintenance costs, and thus lower N removal cost. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. A B S T R A C TWoodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (< 10°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification efficiency of electrically augmented woodchip bioreactors and conduct a simple techno-economic analysis (TEA) to understand the possibilities and limitations for full-scale BER im...

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“…Complete mineralization takes place by means of direct anodic oxidation at the anodes with oxygen overpotential, such as Hydroxyl radicals, generated on these anodes, completely oxidize organic pollutants, contained in leachate. However, BDDE electrodes are subject to passivation 11 and are very expensive, lead dioxide coating does not have sufficient mechanical strength, and Ti/SnO 2 anode is apt to corrosion, while also having insufficient anode oxidation efficiency 12 . Therefore, for the electrochemical oxidation of leachate it was proposed to use a specially designed nanocomposite Ti/MnO 2 -SnO 2 anode with the size of SnO 2 nanoparticles not exceeding 40 nm (Fig.…”

Section: Resultsmentioning

confidence: 99%

An Integrated Innovative Technology for The Treatment of Municipal Solid Waste Landfill Leachate

Trifonova¹,

Roschina²,

Shirkin³

et al. 2015

Biosci., Biotech. Res. Asia

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The paper proposes an integrated innovative technology for the treatment of municipal solid waste landfill leachate, containing organic impurities resistant to oxidation and other toxic compounds. The developed process flow chart combines an advanced membrane technology with efficient developments of conventional wastewater treatment methods. In view of the complex multicomponent composition of municipal solid waste landfill leachate, it is proposed to use a modular approach to creating a process flow chart, which makes it possible to develop a leachate treatment technology for a specific MSW landfill, having the leachate with a specific qualitative composition. The development of this technology will make it possible to obtain purified water with characteristics, complying with the maximum allowable concentrations (MACs) for fishery water bodies.

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Efficient electrochemical reduction of nitrate to nitrogen using Ti/IrO2–Pt anode and different cathodes

Cited by 229 publications

References 42 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

Electrical stimulation for enhanced denitrification in woodchip bioreactors: Opportunities and challenges

An Integrated Innovative Technology for The Treatment of Municipal Solid Waste Landfill Leachate

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