Electrochemical treatment of residual ammonia nitrogen in biologically pretreated coking wastewater with three-dimensional electrodes

2011 ◽  
Vol 63 (11) ◽  
pp. 2732-2736 ◽  
Author(s):  
Xu-wen He ◽  
Li-yuan Liu ◽  
Hao Wang ◽  
Gong Zhang ◽  
Jing-wen Gong ◽  
...  
Keyword(s):  
Current Density ◽  
Three Dimensional ◽  
Surface Characteristics ◽  
Electrochemical Treatment ◽  
Ammonia Nitrogen ◽  
Electrode System ◽  
Coking Wastewater ◽  
Two Dimensional ◽  
Electrode Distance ◽  
Good Surface

The electrochemical oxidation of the residual ammonia nitrogen contained in biologically pretreated coking wastewater using three-dimensional electrode system was studied. The results show the Ti/RuO2/IrO2 anode plates and the coke have good surface characteristics for the purpose of this study. In addition, studies also show that the three-dimensional electrode system should be able to give a satisfied solution to the residual bio-refractory ammonia nitrogen in biologically pretreated coking wastewater in comparison to conventional two-dimensional electrodes. At coke size of 10–20 mesh, electrode distance of 1.0 cm and current density of 4.5 mA/cm2, the residual ammonia nitrogen in the three-dimensional electrode system was almost completely removed in 60 min.

Electrochemical Treatment of Oilfield Produced Wastewater on Ni-Sb- SnO2/Ti Electrodes

2013 ◽  
Vol 16 (2) ◽  
Author(s):  
Wang Yun-Hai ◽  
Kuang Jun-Yao
Keyword(s):  
Energy Efficiency ◽  
Current Efficiency ◽  
Current Density ◽  
Tin Dioxide ◽  
Electrochemical Treatment ◽  
Cod Removal ◽  
Electrolysis Time ◽  
Removal Ratio ◽  
Electrode Distance

AbstractNickel and antimony doped tin dioxide (NATO) coated titanium electrodes were used for electrochemical treatment of oilfield produced wastewater. The effects of electrode distance, current density and electrolysis time on COD removal ratio, current efficiency, energy efficiency and BOD to COD ratio were investigated. The optimized electrode distance of 5 mm and current density of 6 mA cm

Comparative Research on Treating Vehicle-Washing Wastewater with Two and Three-Dimensional Electrode Method

2013 ◽  
Vol 777 ◽  
pp. 370-374 ◽  
Author(s):  
He Lan Guan
Keyword(s):  
Comparative Research ◽  
Degradation Rate ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Electrolysis Time ◽  
Electrode Distance ◽  
Electrode Method ◽  
Aluminum Electrodes ◽  
Washing Wastewater ◽  
Better Than

Treatment of two-dimensional and three-dimensional electrode method was researched and compared respectively using aluminum electrodes. The influences of voltage, electrolysis time, pH and electrode distance on the result were also discussed. It was found that the degradation rate of wastewater with three-dimensional electrode method was much better than two-dimensional method. For the treatment of vehicle-washing wastewater, the best of voltage was 20V, the electrolysis time was 30 min, and the electrode distance was 2cm.

Three-Dimensional Surface Characterization by Two-Dimensional Autoregressive Models

1995 ◽  
Vol 117 (3) ◽  
pp. 385-393 ◽  
Author(s):  
Min S. Hong ◽  
Kornel F. Ehmann
Keyword(s):  
Surface Characterization ◽  
Three Dimensional ◽  
Surface Characteristics ◽  
Analytical Tool ◽  
Autoregressive Models ◽  
Density Functions ◽  
Two Dimensional ◽  
Engineered Surfaces ◽  
Spectrum Density ◽  
Dimensional Surface

An attempt is made to characterize and synthesize engineered surfaces. The proposed method, based on two-dimensional difference equations and two-dimensional linear autoregressive models, is not only an analytical tool to characterize but also to generate/synthesize three-dimensional surfaces with desired properties. The developed method expresses important three-dimensional surface characteristics such as the autocorrelation or power spectrum density functions in terms of the two-dimensional autoregressive coefficients.

Kinetics for ammonium ion removal using a three-dimensional electrode system

2013 ◽  
Vol 67 (1) ◽  
pp. 168-173 ◽  
Author(s):  
Qicheng Qiao ◽  
Yuemin Zhao ◽  
Lizhang Wang
Keyword(s):  
Rate Constant ◽  
Current Density ◽  
Three Dimensional ◽  
Electrode System ◽  
Experimental Results ◽  
Ammonium Ion ◽  
Ion Removal ◽  
First Order Kinetics ◽  
Accurate Design ◽  
Chlorine Ions

Electrochemical oxidation of ammonium ions (NH4+) by using a three-dimensional electrode (TDE) composed of IrO2–Ta2O5/Ti anode and bamboo carbon was carried out in this paper. Experimental results reveal that the NH4+ oxidation follows first-order kinetics at lower NH4+ concentration and the rate constant is highly dependent on the applied current density, dosage of chlorine ions and initial NH4+ concentration. In addition, increasing current density, more Cl− dosage and higher initial NH4+ concentration are beneficial for NH4+ removal. By inspecting the relation between rate constant and those operating factors, an overall empirical equation for estimation of the rate constant of NH4+ oxidation is presented. The estimated model is in good agreement with the experimental results and it could also be used for accurate design of the TDE system.

Tertiary Treatment of Paper Industries Effluent with Advanced Electrochemical Oxidation Process in the Presence of Modified Bentonite Powdery Electrodes

2013 ◽  
Vol 690-693 ◽  
pp. 1065-1068 ◽  
Author(s):  
Zhen Wang ◽  
Ze Sheng Cheng ◽  
Yu Liu ◽  
Na Na Bo ◽  
Ying Liu
Keyword(s):  
Removal Efficiency ◽  
Current Density ◽  
Paper Industry ◽  
Three Dimensional ◽  
Electrode System ◽  
Pulp And Paper ◽  
Tertiary Treatment ◽  
Modified Bentonite ◽  
Cost Treatment ◽  
Pulp And Paper Effluent

Tertiary treatment wascarried out to treat pulp and paper effluent from secondary treatment processby a three-dimensional electrode system equipped with modifiedbentonites as powdery electrode. The cetyl trimethylammonium bromide modified bentonite (CTAB-bent) and hydroxy-aluminum pillaredorganic bentonite (OH-Al-CTAB-bent) were synthesized and characterized by XRDand FTIR spectroscopy analysis.The impacts such as the dosage of particle electrode, electrolysis times,current density were on the COD removal efficiency and decolorization effect ofeffluent were also investigated. The results showed that the experimentscarried out by three-dimensional electrode system with OH-Al-CTAB-bent weresufficient for the COD and color removal efficiency. A current density of 30mA/cm2, electrolysis time of 40min, and the particle electrodedosage of 1.6g/L were selected as an optimum conditions that allows fast andlow cost treatment. The effluent can achieve the discharge standard of waterpollutants for pulp and paper industry (GB3544-2008) after electrolysis.

scholarly journals Metal powder electrolysis: The shape of powder particles as a function of the exchange current density and overpotential for hydrogen evolution reaction

2020 ◽  
Vol 85 (3) ◽  
pp. 347-352
Author(s):  
Nebojsa Nikolic
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Dendritic Growth ◽  
Three Dimensional ◽  
Exchange Current ◽  
Exchange Current Density ◽  
Two Dimensional ◽  
Molten Salt Electrolysis ◽  
Powder Particles

The short survey of the dependence of the shape of electrolytically produced powder particles on the exchange current density for metal deposition and overpotential for hydrogen evolution reaction is presented. The decrease of the exchange current density leads to a branching of dendrites and their transformation from needle-like and the two-dimensional (2D) fern-like to the three-dimensional (3D) pine-like shapes. Vigorous hydrogen evolution inhibits the dendritic growth leading to a formation of cauliflower-like and the spongy-like particles. The very thin needles were obtained by molten salt electrolysis. Mechanisms responsible for the formation of both the dendritic (the general theory of disperse deposits formation) and the cauliflower-like and the spongy-like particles (the concept of ?effective overpotential?) were also mentioned.

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