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Papers by Ahmed Boucherit

Research paper thumbnail of Brownian Motion and Coagulation Process

This review discusses the Brownian motion and coagulation/flocculation (C/F) in water/wastewater ... more This review discusses the Brownian motion and coagulation/flocculation (C/F) in water/wastewater treatment. In
water/wastewater treatment processes, pertinent questions relating to Brownian motion and C/F are often asked. Some of these questions are: Brownian motion and molecular agitation are favourable or not to separation processes? As high salinity (seawater) decreases disorder, increasing surface water salinity would be a convenient water treatment process or not? The processes of C/F are used to remove dissolved substances and colloids from water in order to assure efficient settling.

Research paper thumbnail of Electrocoagulation of Direct Brown 2 (DB) and BF Cibacete Blue (CB) Using Aluminum Electrodes

This work studies the electrocoagulation (EC) process for the treatment of colored solutions of t... more This work studies the electrocoagulation (EC) process for the
treatment of colored solutions of two dyes used in the textile
industry: direct brown 2 (DB) and BF cibacete blue (CB) using
aluminum electrodes in batch mode. Key EC parameters are investigated. The pH effect is found to be more important than the supporting electrolyte on the electrochemical process. The best EC efficiencies are as follows: for DB, 99.89% removal at 40 mg/L (pH 10, U = 12 V, tEC = 60 min); and for CB, 99.74% removal at 40 mg/L (pH 2.5, U = 12 V, tEC = 60 min). The power consumption is 16.56 and 17.04 kWh/m3 for DB and CB, respectively.

Research paper thumbnail of Degradation of direct yellow 9 by electro-Fenton: Process study and optimization and, monitoring of treated water toxicity using catalase

Ecotoxicology and Environmental Safety, 2014

The present study was undertaken to investigate the degradation and removal of direct yellow 9 (D... more The present study was undertaken to investigate the degradation and removal of direct yellow 9 (DY9) by the electro-Fenton (EF) process in batch reactor using iron and stainless steel electrodes. DY9 removal decreased with the increase in pH (3 to 8) and increased with the increase in current intensity (0.05 to 0.2A) and [H2O2] (0 to 0.5gL(-1), but not with high doses which led to low rates of DY9 removal and OH(∙) uptake). The regression quadratic models describing DY9 degradation yield "R (percent)" and electrical energy consumption "EEC (kWhkg(-1))" were validated by the analysis of variance (ANOVA) and were both noted to fit well with the experimental data. The R(2) correlation coefficients (0.995, 0.978), those adjusted coefficients (0.986, 0.939), and F values (110.7, 24.9) obtained for the responses validated the efficiency of model. The results revealed that among several other parameters, EEC depended essentially on the degradation yield. The eco-toxicity tests showed a positive correlation between catalase activity and DY9 concentration, and catalase could be qualitatively identified to assess the effect of dye and its by-products generated during the EF process.

Research paper thumbnail of Effect of pH on Electrocoagulation of Bentonite Suspensions in Batch Using Iron Electrodes

Journal of Dispersion Science and Technology, 2008

Research paper thumbnail of Screening and preliminary characterization of biosurfactants produced by Ochrobactrum sp. 1C and Brevibacterium sp. 7G isolated from hydrocarbon-contaminated soils

International Biodeterioration & Biodegradation, 2011

... were used. A glycolipid biosurfactant produced by Brevibacterium casei MSA19 showed a higher ... more ... were used. A glycolipid biosurfactant produced by Brevibacterium casei MSA19 showed a higher emulsification index than synthetic surfactants such as SDS, Tween 20, and Tween 80 (Seghal-Kiran et al., 2010a). Moreover ...

Research paper thumbnail of Removal of humic acids by continuous electromagnetic treatment followed by electrocoagulation in batch using aluminium electrodes

Research paper thumbnail of Study on mechanism of electrocoagulation with iron electrodes in idealised conditions and electrocoagulation of humic acids solution in batch using aluminium electrodes

Desalination and Water Treatment, 2009

This work consists to use distilled water as a solution in electrocoagulation (EC) tests using ir... more This work consists to use distilled water as a solution in electrocoagulation (EC) tests using iron
electrodes in order to bear witness to EC mechanisms and concerns EC of humic acids (HA) solution
(10 mg L1) in batch using aluminium electrodes with pH modification and magnetic agitation.
The pH of the distilled water is adjusted to three representative values: 2 (acid), 7 (neutral)
and 12 (alkaline). Based on the current intensity as a function of applied voltage variation and the
pertinent literature, three mechanisms are proposed for acid, neutral and alkaline pH. For pH 2,
Mechanism 1 explains Fe(OH)2(s) formation; for pH 7, Mechanism 2 concerns both the varieties
Fe(OH)2(s) and Fe(OH)3(s) production; and for pH 12, Mechanism 3 is characterised by Fe(OH)3(s)
apparition. From these results, it can be seen that there is an extremely high dependence of iron
species on pH in EC system. Finally, EC process using aluminium electrodes (better than iron
ones) is proved highly efficient for HA removal (more than 70%) by charge neutralisation and
adsorption (current density 16.6 A m2 during 30 min at pH 7).

Research paper thumbnail of Brownian Motion and Coagulation Process

This review discusses the Brownian motion and coagulation/flocculation (C/F) in water/wastewater ... more This review discusses the Brownian motion and coagulation/flocculation (C/F) in water/wastewater treatment. In
water/wastewater treatment processes, pertinent questions relating to Brownian motion and C/F are often asked. Some of these questions are: Brownian motion and molecular agitation are favourable or not to separation processes? As high salinity (seawater) decreases disorder, increasing surface water salinity would be a convenient water treatment process or not? The processes of C/F are used to remove dissolved substances and colloids from water in order to assure efficient settling.

Research paper thumbnail of Electrocoagulation of Direct Brown 2 (DB) and BF Cibacete Blue (CB) Using Aluminum Electrodes

This work studies the electrocoagulation (EC) process for the treatment of colored solutions of t... more This work studies the electrocoagulation (EC) process for the
treatment of colored solutions of two dyes used in the textile
industry: direct brown 2 (DB) and BF cibacete blue (CB) using
aluminum electrodes in batch mode. Key EC parameters are investigated. The pH effect is found to be more important than the supporting electrolyte on the electrochemical process. The best EC efficiencies are as follows: for DB, 99.89% removal at 40 mg/L (pH 10, U = 12 V, tEC = 60 min); and for CB, 99.74% removal at 40 mg/L (pH 2.5, U = 12 V, tEC = 60 min). The power consumption is 16.56 and 17.04 kWh/m3 for DB and CB, respectively.

Research paper thumbnail of Degradation of direct yellow 9 by electro-Fenton: Process study and optimization and, monitoring of treated water toxicity using catalase

Ecotoxicology and Environmental Safety, 2014

The present study was undertaken to investigate the degradation and removal of direct yellow 9 (D... more The present study was undertaken to investigate the degradation and removal of direct yellow 9 (DY9) by the electro-Fenton (EF) process in batch reactor using iron and stainless steel electrodes. DY9 removal decreased with the increase in pH (3 to 8) and increased with the increase in current intensity (0.05 to 0.2A) and [H2O2] (0 to 0.5gL(-1), but not with high doses which led to low rates of DY9 removal and OH(∙) uptake). The regression quadratic models describing DY9 degradation yield "R (percent)" and electrical energy consumption "EEC (kWhkg(-1))" were validated by the analysis of variance (ANOVA) and were both noted to fit well with the experimental data. The R(2) correlation coefficients (0.995, 0.978), those adjusted coefficients (0.986, 0.939), and F values (110.7, 24.9) obtained for the responses validated the efficiency of model. The results revealed that among several other parameters, EEC depended essentially on the degradation yield. The eco-toxicity tests showed a positive correlation between catalase activity and DY9 concentration, and catalase could be qualitatively identified to assess the effect of dye and its by-products generated during the EF process.

Research paper thumbnail of Effect of pH on Electrocoagulation of Bentonite Suspensions in Batch Using Iron Electrodes

Journal of Dispersion Science and Technology, 2008

Research paper thumbnail of Screening and preliminary characterization of biosurfactants produced by Ochrobactrum sp. 1C and Brevibacterium sp. 7G isolated from hydrocarbon-contaminated soils

International Biodeterioration & Biodegradation, 2011

... were used. A glycolipid biosurfactant produced by Brevibacterium casei MSA19 showed a higher ... more ... were used. A glycolipid biosurfactant produced by Brevibacterium casei MSA19 showed a higher emulsification index than synthetic surfactants such as SDS, Tween 20, and Tween 80 (Seghal-Kiran et al., 2010a). Moreover ...

Research paper thumbnail of Removal of humic acids by continuous electromagnetic treatment followed by electrocoagulation in batch using aluminium electrodes

Research paper thumbnail of Study on mechanism of electrocoagulation with iron electrodes in idealised conditions and electrocoagulation of humic acids solution in batch using aluminium electrodes

Desalination and Water Treatment, 2009

This work consists to use distilled water as a solution in electrocoagulation (EC) tests using ir... more This work consists to use distilled water as a solution in electrocoagulation (EC) tests using iron
electrodes in order to bear witness to EC mechanisms and concerns EC of humic acids (HA) solution
(10 mg L1) in batch using aluminium electrodes with pH modification and magnetic agitation.
The pH of the distilled water is adjusted to three representative values: 2 (acid), 7 (neutral)
and 12 (alkaline). Based on the current intensity as a function of applied voltage variation and the
pertinent literature, three mechanisms are proposed for acid, neutral and alkaline pH. For pH 2,
Mechanism 1 explains Fe(OH)2(s) formation; for pH 7, Mechanism 2 concerns both the varieties
Fe(OH)2(s) and Fe(OH)3(s) production; and for pH 12, Mechanism 3 is characterised by Fe(OH)3(s)
apparition. From these results, it can be seen that there is an extremely high dependence of iron
species on pH in EC system. Finally, EC process using aluminium electrodes (better than iron
ones) is proved highly efficient for HA removal (more than 70%) by charge neutralisation and
adsorption (current density 16.6 A m2 during 30 min at pH 7).