Product and by-product formation in laboratory studies on disinfection electrolysis of water using boron-doped diamond anodes

Bergmann, M. E. Henry; Rollin, Johanna

doi:10.1016/j.cattod.2007.03.038

Cited by 187 publications

(137 citation statements)

References 12 publications

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“…On the one hand, the metallic hydroxides that are formed tend to polymerize because of the interactions between the hydroxyl groups; they then become microflocs, and then big flocs which are responsible for the coagulation and the flocculation (Kumar et al 2004). On the other hand, different chlorine species formed have been recognized as key oxidants, responsible for the inactivation of microbial cells in electrochemical disinfection (Bergmann and Rollin 2007). It has been demonstrated that chlorine species diffuse through the cell walls, produces a dysfunction in the internal enzyme groups and hence inactivates cells.…”

Section: Effect On E Coli Inactivationmentioning

confidence: 99%

“…- (Bergmann and Rollin 2007); and the electrogeneration of disinfection by-products, especially in the case where chloride ions are present such as the following active chlorine species Cl 2 , HOCl and OCl -. It was eventually demonstrated that even at very low chloride concentrations (\100 mg L -1 ), sufficient free chlorine can be electrochemically produced to efficiently disinfect water (Bergmann and Koparal 2005).…”

Section: Introductionmentioning

confidence: 99%

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Effect of electrode material and supporting electrolyte on the treatment of water containing Escherichia coli by electrocoagulation

Ndjomgoue-Yossa

Nanseu‐Njiki

Kengne

et al. 2014

Int. J. Environ. Sci. Technol.

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Laboratory experiments were carried out to investigate the mechanisms of electrochemical disinfection of artificial wastewater contaminated by Escherichia coli culture (5 9 10 5 UFC/100 mL) using electrocoagulation. In order to go deeply into the mechanism of the process, the behaviors of two dissolved-type electrodes (ordinary steel and aluminum) and a non-dissolved-type (carbon graphite) electrode were compared. The ordinary steel electrode was found more efficient for E. coli cells destruction compared to aluminum and carbon graphite electrodes. In order to determine the most favorable condition for the treatment, the effect of various supporting electrolytes including, sodium chloride, sodium sulfate and sodium nitrate, was scrutinized. E. coli is inactivated by 5 log units for a charge loading of 37.30 F/m 3 for sodium sulfate, 24.87 F/m 3 for sodium nitrate and 12.43 F/m 3 for sodium chloride. It thus appears that the most favorable supporting electrolyte type for this method of disinfection is sodium chloride, a fact which can be explained by the formation of disinfectant byproducts such as chlorine dioxide, hypochlorite ions and perchlorate ions. From the results obtained, electrocoagulation applied to the elimination of E. coli proceeds through three combined effects: the electric field, the actions of oxidants electrogenerated during the process and the adsorption by the metallic hydroxides formed in solution.

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Section: Effect On E Coli Inactivationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of electrode material and supporting electrolyte on the treatment of water containing Escherichia coli by electrocoagulation

Ndjomgoue-Yossa

Nanseu‐Njiki

Kengne

et al. 2014

Int. J. Environ. Sci. Technol.

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“…Using a BDD anode, besides direct electron transfer reactions, the electro-oxidation pathway of Cl À also includes the chemical oxidation reactions with hydroxyl radicals [33][34][35][36][37][38][39]. The possible pathway is exhibited in reaction scheme (6) listed in Table 1.…”

Section: Introductionmentioning

confidence: 99%

On the role of salts for the treatment of wastewaters containing pharmaceuticals by electrochemical oxidation using a boron doped diamond anode

Lan

Coetsier

Causserand

et al. 2017

Electrochimica Acta

153

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Refractory pharmaceuticals remain in biologically treated wastewater and are continuously discharged into aquatic systems due to their limited biodegradability. Electrochemical oxidation is promising for the treatment of such refractory compounds, in particular using a boron doped diamond (BDD) anode. This study investigates the role of salts, such as sulfates and chlorides in the electrochemical treatment of wastewater. The presence of sulfates accelerated the removal of ciprofloxacin and sulfamethoxazole, but had no effect on the oxidation of salbutamol. This comparison highlights the selectivity of the reaction between organics and sulfate radicals. The addition of chlorides into the solution led to a remarkablyfaster degradation of ciprofloxacin. However, incomplete mineralization was observed at high current densities due to the significant formation of halogenated organic compounds (AOX). The formation of refractory and toxic compounds such as ClO 4 À and AOX can be limited under the control of (i) applied current intensity and (ii) duration of electrolysis. Electrochemical oxidation of concentrated biologicallytreated hospital wastewater investigated the excellent removal of biorefractory pharmaceuticals and confirmed the acceleration effect of salts on pharmaceutical degradation.

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“…When they are applied in desalination processes, the major waste output is concentrated brine. The concentrated brine generated from desalination is usually discarded into the surrounding sea, resulting in a negative impact to the marine environment and endangering native marine life and ecosystems [5][6][7]. Over-disposal can even cause a rapid salinity increase in specific sea areas, resulting in dead seas.…”

Section: Introductionmentioning

confidence: 99%

A Study on Brine Resource Utilization in Desalination Plants

Chang¹,

Wu²,

Li³

et al. 2017

dteees

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Abstract. In this study, we utilized electrolytic catalysis technology and the concentrated brine from the Matsu Nankan Desalination Third Stage Plant to develop a brine resource utilization process, producing a multi-oxidant with disinfection efficacy, containing chlorine dioxide (ClO 2 ), chlorine (Cl 2 ), ozone (O 3 ) and hypochlorous acid (HOCl). This experimental result is expected to achieve waste resource utilization by using the waste concentrated brine as an electrolyte material to produce disinfectants by an electrolysis procedure. The disinfectant generated can also be used in many sterilizing processes in the plant. In the study, the optimal operational conditions were controlled at 40 ℃ for temperature and 12 V for cell voltage. 6 % NaClO 2 was added into the same brine. Under these optimum conditions, the major product became ClO 2 with a maximum concentration of 1074 mg L -1 . Comparing the disinfection efficacies between 1 ppm of commercial 10 % hypochlorous acid and the multi-oxidant produced in this study, the efficacies of hypochlorous acid and the multi-oxidant reached 28 % and 93 %. The latter was three times greater than the former. In conclusion, the multi-oxidant produced by recycling the brine from desalination plants was expected to have applicability and economic value.

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Product and by-product formation in laboratory studies on disinfection electrolysis of water using boron-doped diamond anodes

Cited by 187 publications

References 12 publications

Effect of electrode material and supporting electrolyte on the treatment of water containing Escherichia coli by electrocoagulation

Effect of electrode material and supporting electrolyte on the treatment of water containing Escherichia coli by electrocoagulation

On the role of salts for the treatment of wastewaters containing pharmaceuticals by electrochemical oxidation using a boron doped diamond anode

A Study on Brine Resource Utilization in Desalination Plants

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