scholarly journals Electrochemical Treatment of synthetic and Actual Dyeing Wastewaters Using BDD Anodes

2010 ◽  
Vol 3 ◽  
pp. ASWR.S3639 ◽  
Author(s):  
Nasr Bensalah ◽  
Ahmed Abdel-Wahab
Keyword(s):  
Supporting Electrolyte ◽  
Great Influence ◽  
Electrochemical Treatment ◽  
Electrochemical Process ◽  
Operating Conditions ◽  
Anode Surface ◽  
Boron Doped Diamond ◽  
Potential Region ◽  
Toc Removal ◽  
Boron Doped

In this work, the treatment of synthetic wastewaters containing methylene blue (MB) and rhodamine B (RB) and actual textile wastewaters (ATW) using boron doped diamond (BDD) anodic oxidation was investigated. Voltammetric study has shown that both MB and RB can be oxidized directly at the anode surface in the potential region where the electrolyte salt is stable. Galvanostatic electrolyses of synthetic and actual industrial wastewaters have led to total abatement of COD and TOC at different operating conditions (electrolyte salt and initial pollutant concentration and current density) and the efficiency of the electrochemical process was governed only by mass-transfer limitations. The nature of the supporting electrolyte has a great influence on the rate and the efficiency of the electrochemical oxidation of dyes. The treatment in the presence of NaCl appears to be more efficient in the COD removal, while in the presence of Na2SO4 improves the TOC removal. From the experimental results it seems that the primary mechanisms in the oxidation of dyes are the mediated electro-oxidation by hydroxyl radicals and other oxidants electro-generated from supporting electrolyte oxidation.

Anodic Oxidation of Aqueous Wastes Containing Hydroquinone on BDD Electrode

2015 ◽  
Vol 18 (1) ◽  
Author(s):  
Hassen Trabelsi ◽  
Nasr Bensalah ◽  
Abdellatif Gadri
Keyword(s):  
High Efficiency ◽  
Supporting Electrolyte ◽  
Electrochemical Process ◽  
Applied Current ◽  
Boron Doped Diamond ◽  
Potential Region ◽  
Boron Doped ◽  
Electro Oxidation ◽  
Discontinuous Mode ◽  
Hplc Analyses

AbstractThe electrochemical oxidation of 1,4 dihydroxybenzene, was studied by galvanostatic electrolysis using boron-doped diamond (BDD) as anode. The efficiency of the electrochemical process was found to depend mainly on the pollutant concentration present in the waste and on the applied current density. The voltammetric results showed that hydroquinone oxidation takes place in the same potential region as that of phenol where the supporting electrolyte is stable. Synthetic wastewaters containing hydroquinone have been treated in a bench-scale electrolysis plant. This plant operates in a discontinuous mode by recirculating the waste continuously through a single-chamber electrochemical flow cell. The complete mineralization of hydroquinone and the electro-generated pollutants is obtained in the electrolytic device. HPLC analyses show the formation of carboxylic acids as the main intermediates. The high efficiency of this technology can be explained in terms of the direct electro-oxidation at the BDD surface and the oxidation carried out by hydroxyl radicals and other electro-generated oxidants.

Electrochemical treatment of wastewaters containing 4-nitrocathecol using boron-doped diamond anodesA paper submitted to the Journal of Environmental Engineering and Science.

2009 ◽  
Vol 36 (4) ◽  
pp. 683-689
Author(s):  
Nasr Bensalah ◽  
Mohamed F. Ahmadi ◽  
Abdelatif Gadri
Keyword(s):  
Electrochemical Oxidation ◽  
Carboxylic Acids ◽  
Aromatic Ring ◽  
Supporting Electrolyte ◽  
Electrochemical Treatment ◽  
Boron Doped Diamond ◽  
Potential Region ◽  
Polymeric Product ◽  
Boron Doped ◽  
Mineral Product

The electrochemical oxidation of aqueous wastes polluted with 4-nitrocathecol has been studied on boron-doped diamond electrodes in an acidic medium. The voltammetric results showed that 4-nitrocathecol is oxidized in the potential region where the supporting electrolyte is stable. Galvanostatic electrolysis study showed that the oxidation of these wastes in a single-compartment electrochemical flow cell with boron-doped diamond anodes results in the complete mineralization of the organics. Cathecol, benzoquinone, 4-aminocathecol, maleic and oxalic acids have been detected as soluble organics, polymeric product as solid product at the cathode surface and NO3– as mineral product during the electrolysis of 4-nitrocathecol. The electrochemical oxidation of 4-nitrocathecol consists of a sequence of steps: release of NO2 and (or) hydroxylation of the aromatic ring; formation of quinonic compounds; oxidative opening of aromatic ring to form carboxylic acids; and oxidation of carboxylic acids to carbon dioxide. Both direct and mediated oxidation processes are involved in these stages.

scholarly journals A Comparative Electrochemical-Ozone Treatment for Removal of Phenolphthalein

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
V. M. García-Orozco ◽  
C. E. Barrera-Díaz ◽  
G. Roa-Morales ◽  
Ivonne Linares-Hernández
Keyword(s):  
Electrochemical Treatment ◽  
Electrochemical Process ◽  
Ozone Treatment ◽  
Acidic Ph ◽  
Alkaline Ph ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Electrochemical Processes ◽  
Density Values

The degradation of aqueous solutions containing phenolphthalein was carried out using ozone and electrochemical processes; the two different treatments were performed for 60 min at pH 3, pH 7, and pH 9. The electrochemical oxidation using boron-doped diamond electrodes processes was carried out using three current density values: 3.11 mA·cm−2, 6.22 mA·cm−2, and 9.33 mA·cm−2, whereas the ozone dose was constantly supplied at 5±0.5 mgL−1. An optimal degradation condition for the ozonation treatment is at alkaline pH, while the electrochemical treatment works better at acidic pH. The electrochemical process is twice better compared with ozonation.

scholarly journals OXIDAÇÃO ANÓDICA PARA DESCONTAMINAÇÃO DE UM EFLUENTE CONTAMINADO COM O HERBICIDA GLIFOSATO UTILIZANDO ANODO DE DIAMANTE DOPADO COM BORO

Química Nova ◽  
2021 ◽  
Author(s):  
Maycon Lima ◽  
Ana Fajardo ◽  
Elaine Santos ◽  
Aline Sales-Solano ◽  
Djalma Silva ◽  
...  
Keyword(s):  
Negative Impact ◽  
Oxygen Demand ◽  
Electrochemical Treatment ◽  
Operating Conditions ◽  
Boron Doped Diamond ◽  
Recirculation Flow ◽  
Electrochemical Systems ◽  
Boron Doped ◽  
Magnetic Stirring ◽  
Initial Ph

ANODIC OXIDATION FOR DECONTAMINATION OF CONTAMINATED EFFLUENT WITH GLYPHOSATE HERBICIDE USING BORON DOPED DIAMOND ANODE. Glyphosate is one of the most widely used herbicides in various crops. Based on the existing literature, this herbicide has carcinogenic characteristics, being able to be found in water courses, not only for its leaching in soils, but also in the effluents of the industries that produce it. Due to its negative impact on living beings, this work aims to investigate the applicability of the electrochemical treatment of a synthetic solution containing glyphosate with boron-doped diamond anode. Two electrochemical systems were tested (magnetic stirring and recirculation flow) for studying the applied current density (j = 30-200 mA cm-2), initial glyphosate concentration (250-850 mg L-1) and initial pH (3-9) as operating conditions. Best removal efficiencies were achieved at 100 mA cm-2, 850 mg L-1 of glyphosate and the natural effluent pH (≈5,0). The performance of the electrochemical systems was evaluated in terms of removal of chemical oxygen demand (COD) and energy requirements. After 120 min of treatment, comparing the magnetic stirring system to the recirculation it was verified that the first one is the most economically viable with an energy consumption of 56 kWh m-3. However, the results at both electrochemical systems are mor

scholarly journals Low-coherence photonic method of electrochemical processes monitoring

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Monika Kosowska ◽  
Paweł Jakóbczyk ◽  
Michał Rycewicz ◽  
Alex Vitkin ◽  
Małgorzata Szczerska
Keyword(s):  
Electrochemical Process ◽  
Electrochemical Measurements ◽  
Boron Doped Diamond ◽  
Silica Substrate ◽  
Low Coherence ◽  
Optical Responses ◽  
Boron Doped ◽  
Fabry Perot ◽  
Hybrid Characterization

AbstractWe present an advanced multimodality characterization platform for simultaneous optical and electrochemical measurements of ferrocyanides. Specifically, we combined a fiber-optic Fabry–Perot interferometer with a three-electrode electrochemical setup to demonstrate a proof-of-principle of this hybrid characterization approach, and obtained feasibility data in its monitoring of electrochemical reactions in a boron-doped diamond film deposited on a silica substrate. The film plays the dual role of being the working electrode in the electrochemical reaction, as well as affording the reflectivity to enable the optical interferometry measurements. Optical responses during the redox reactions of the electrochemical process are presented. This work proves that simultaneous opto-electrochemical measurements of liquids are possible.

scholarly journals Development of an Electrochemical Process for Blackwater Disinfection in a Freestanding, Additive-Free Toilet

2017 ◽  
Author(s):  
Katelyn Sellgren ◽  
◽  
Christopher Gregory ◽  
Michael Hunt ◽  
Ashkay Raut ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Electrochemical Process ◽  
Mixed Metal Oxide ◽  
Boron Doped Diamond ◽  
High Effectiveness ◽  
Electrochemical Disinfection ◽  
E Coli ◽  
Boron Doped ◽  
Improved Sanitation ◽  
Conventional Wastewater Treatment

Electrochemical disinfection has gained interest as an alternative to conventional wastewater treatment because of its high effectiveness and environmental compatibility. Two and a half billion people currently live without improved sanitation facilities. Our research efforts are focused on developing and implementing a freestanding, additive-free toilet system that treats and recycles blackwater on site. In this study, we sought to apply electrochemical disinfection to blackwater. We compared commercially available boron-doped diamond (BDD) and mixed metal oxide (MMO) electrodes for disinfection efficiency in E. coli–inoculated model wastewater. The MMO electrodes were found to be more efficient and thus selected for further study with blackwater. The energy required for disinfection by the MMO electrodes increased with the conductivity of the medium, decreased with increased temperature, and was independent of the applied voltage. Fecal contamination considerably increased the energy required for blackwater disinfection compared to model wastewater, demonstrating the need for testing in effluents representing the conditions of the final application.

Sign in / Sign up

Export Citation Format

Share Document