Electrochemical treatment of wastewater polluted by nitrate: selective reduction to N2 on Boron-Doped Diamond cathode

2011 ◽  
Vol 63 (2) ◽  
pp. 206-212 ◽  
Author(s):  
V. Georgeaud ◽  
A. Diamand ◽  
D. Borrut ◽  
D. Grange ◽  
M. Coste
Keyword(s):  
Industrial Wastewater ◽  
Selective Reduction ◽  
Electrochemical Treatment ◽  
Nitrate Content ◽  
Boron Doped Diamond ◽  
Experimental Conditions ◽  
Electrochemical Tests ◽  
Boron Doped ◽  
Low Energy Consumption ◽  
Current Densities

Electrochemical tests of nitrate reduction on Boron-Doped Diamond cathode are investigated through a Design of Experiments (DOE) method. The results show good reduction of nitrate into almost exclusively N2. In the studied domain, the best experimental conditions are high initial nitrate content, low acidic pH values and low working current densities. The application of DOE conclusions on an agro-industrial wastewater gives really satisfying results: final nitrate contents lower than 50 mg/L without nitrite or ammonium formation, and with low energy consumption (under 25 kWh/kgNO3).

Use of seawater for the boron-doped diamond electrochemical treatment of diluted vinasse wastewater

2013 ◽  
Vol 68 (11) ◽  
pp. 2344-2350 ◽  
Author(s):  
V. M. Daskalaki ◽  
H. Marakas ◽  
D. Mantzavinos ◽  
A. Katsaounis ◽  
P. Gikas
Keyword(s):  
Electrochemical Treatment ◽  
Organic Content ◽  
Boron Doped Diamond ◽  
Total Oxidation ◽  
Boron Doped ◽  
Novel Approach ◽  
Nacl Concentration ◽  
Current Densities ◽  
Reactive Radicals ◽  
High Organic Content

Vinasse wastewater of high organic content (COD = 131,000 mg/L) and low biodegradability (BOD5/COD = 0.11) cannot be easily managed and usually require several consecutive treatment steps. The objective of this work was to dilute vinasse wastewater with seawater and then subject them to electrochemical oxidation over boron-doped diamond (BDD) electrodes. The use of seawater is a rational and novel approach for plants close to the seashore since it may achieve the desirable levels of effluent concentration and conductivity without consuming other water resources and extra electrolytes. Experiments were conducted at initial COD values of 830–8,400 mg/L, NaCl concentrations of 34–200 mM and current densities of 70–200 mA/cm2 for up to 5 hours. The effect of current density and NaCl concentration was marginal on the electrochemical treatment, while the single most important parameter was the initial COD concentration. The order of reaction for COD reduction appears to be ‘first’ at low effluent concentrations and it decreases to ‘zero’ at higher concentrations, denoting the importance of the ratio of organics to reactive radicals concentration. Based on COD and total organic carbon data, it is postulated that degradation occurs predominantly through total oxidation (i.e. mineralization) to carbon dioxide and water, which is characteristic of BDD anodes.

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.

Distillery Wastewater Treated by Electrochemical Oxidation with Boron-Doped Diamond Electrodes

2011 ◽  
Vol 14 (2) ◽  
Author(s):  
Christian E. Alvarez-Pugliese ◽  
Paola Moreno-Wiedman ◽  
Fiderman Machuca-Martínez ◽  
Nilson Marriaga-Cabrales
Keyword(s):  
Electrochemical Oxidation ◽  
Linear Sweep Voltammetry ◽  
Direct Oxidation ◽  
Linear Sweep ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Distillery Wastewater ◽  
Current Densities

AbstractElectrochemical oxidation of pretreated distillery wastewater was performed using a boron doped diamond anode (BDD). The role of direct oxidation of organic matter was assessed with experiments of linear sweep voltammetry, noting that the deactivation of the electrode surface occurs in the region of potentials below oxygen evolution. Then, galvanostatic bulk electrolyses were conducted during 4 hours at current densities (20 mAcm

Aqua-Biomant®: integrated biological and electrochemical oxidation for industrial wastewater treatment

2007 ◽  
Vol 55 (12) ◽  
pp. 195-200 ◽  
Author(s):  
A. Rüdiger ◽  
I. Rüdiger ◽  
L. Jurisevic
Keyword(s):  
Wastewater Treatment ◽  
Electrochemical Oxidation ◽  
Industrial Wastewater ◽  
Innovative Technology ◽  
Boron Doped Diamond ◽  
Industrial Wastewater Treatment ◽  
Boron Doped ◽  
High Efficient ◽  
Persistent Organic Compounds ◽  
Total Residence Time

An innovative technology for industrial wastewater treatment has been developed. The main focus of the new system is a transformation of persistent organic compounds (biorecalcitrant COD) into a biodegradable fraction, followed by high efficient biological elimination using specialised bacteria's. To fulfill these targets the Aqua-Biomant® process integrates two treatment steps: an aerated biological upflow filter and a electrochemical oxidation technique using boron doped-diamond electrodes. The advantages of the process are high efficient COD removal with reduced energy consumption combined with low total residence time.

Electrochemical treatment of cork boiling wastewater with a boron-doped diamond anode

2014 ◽  
Vol 36 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Annabel Fernandes ◽  
Diana Santos ◽  
Maria José Pacheco ◽  
Lurdes Ciríaco ◽  
Rogério Simões ◽  
...  
Keyword(s):  
Electrochemical Treatment ◽  
Boron Doped Diamond ◽  
Boron Doped
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