The mathematical model for the potentiostatic work of CP-based electrochemical sensors and biosensors, used for the detection of two strong organic acids with the common “acid” functional group (using the example of –SO3H group), was developed and analyzed by the using of linear stability theory and bifurcation analysis. The steady-state stability conditions, corresponding to the better response, were developed. The presence of oscillatory and monotonic instabilities was also confirmed.

The possibility of diquat electrochemical detection, realized by conducting polymer electrode, doped by vanadium dioxide, was analyzed by theoretical point of view. It was shown, that the conducting polymer composite with VO2 may serve as an excellent electrode modifier for Diquat electrochemical detection. The steady-state may be maintained stable in the vast parameter region. The possibility for electrochemical instabilities in this system has also been studied.

In the present work, we have conducted a study which is to study the mechanical and hydrodynamic performance (permeability and selectivity) of two asymmetric ultrafiltration membranes, the base matrix is polysulfone PSU UDEL P1700 [1-3]. The first type of these membranes is composed only of polysulfone and the second type is made from polysulfone and polystyrene expanded (PSe) [2]. Both membranes were used in the bleaching of waste water loaded with vat dyes (indigo and sulfur black) by using the technical ultrafiltration (UF), while optimizing the hydrodynamic and mechanical conditions of harvested membranes [2, 4]. The results of this study have been shown that the selectivity and the permeability of the PSU/PSe membrane are more efficient with respect to those of the membrane completely comprised of PSU, on the one hand, and the measured values of the fading rate water loaded with the black sulfur dyes and indigo were recorded respectively at percentages 60.78% and 80.36% appropriate the membrane consisting of PSU only and at percentages 64.04% and 87.24% for the membrane composed of PSU/PSe, the other.The results of this study, we showed that adding PSe in very small quantities in the mixture of polysulfone only has increased mechanical and separative properties (permeability and selectivity) of the resulting membrane..

Solidification/Stabilization treatment of the exhausted oil-based drilling sludge using hydraulic binders, followed by a compaction at the paste phase, was used to reduce the mobility of the pollutants while improving the physical properties of the sludge. The treatment involved mixing the exhausted sludge with required quantities of hydraulic binders such as: Portland artificial cement, air quicklime and water, corresponding to the formulations tested. The obtained smooth paste was subjected to the compaction tests using a triaxial press for the production of standard specimens, in which, leaching tests, chemical analysis and compressive strength measurements were carried out after 30, 60 and 90 days curing. Results revealed that the compaction at the paste phase resulted in optimizing the amount of hydraulic binders and water and improving the retention capacity of pollutants in a cementing matrix compared to previous works. Furthermore, it led to the improvement of the mechanical properties of the stabilized/solidified sludge.

The corrosion behavior of C38 steel in HCl solution with different concentration of newly synthesized Picolinium-based Ionic liquids, 1-2-(4-Nitro Phenyl) 2-oxoethyl) -4N-Nmethyl) Picolinium Bromide (NPOMPB), was investigated by weight loss and electrochemical measurements. The effect of temperature on the corrosion behavior with the addition of (NPOMPB), was studied in the temperature range 298–328 K. Results obtained reveal that (NPOMPB) performs excellently as good corrosion inhibitor for C38 steel in 1.0 M HCl. Potentiodynamic polarization studies have shown that (NPOMPB) inhibition efficiency was found to increase with increase of the inhibitor concentrations to reach 96.5 % at 10-3M of (NPOMPB), due to the adsorption of the inhibitor molecules on the metal surface and the adsorption follows Langmuir’s adsorption isotherm. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability. To elaborate the mechanism of corrosion inhibition, the kinetic and thermodynamic parameters for Carbon steel corrosion and inhibitor adsorption, respectively were determined and discussed.  The Optical microscopy (OM) was used for its morphological studies. Of the surface film was applied in order to get better understanding about the relationship between the inhibition efficiency and molecular structure and also to show the presence of the interfacial elements.

This research work is to the study of a phase prior to provide effective assistance to all those who have to take decisions concerning the planning and implementation of wind energy projects. The main objective is the evaluation of the wind potential and the estimation of the production of a wind farm in the region of Annaba, we began by determining the parameters related to the wind: the velocity distribution, variation in temporal and spatial wind for 11 years, then the available wind energy potential estimate produced by the wind farm

The texture properties and adsorption affinity of Hematite Sand (HS) were studied by nitrogen at 77 K and methylene blue dye adsorption in aqueous phase, respectively. Characterization of raw HS and treated HS was performed. The experimental data were fitted to Langmuir as well as Freundlich adsorption isotherm equations using non-linear regression method. According to the BJH, 40 % of the total pore volume disappeared on treated HS surface after sieving process and acid treatment due to absence of microspores. Finally, the dye adsorption was influenced significantly by solution pH and the presence of inorganic salt (KCl)

In the present study, we carried out a bibliographic and analytically research on the various sources of pollution of wade Beht, by analysing the physicochemical parameters (pH, temperature, conductivity and turbidity) and biological parameters (DCO and DBO5) in water samples taken at five sampling points, to determine the degree of pollution. The results of the analysis of the physicochemical and biological parameters envisaged in this work were recorded in the following order: 7.6 ≤ pH ≤ 8.6, 20 °C for temperature, the conductivity was between 2900 and 3000 μS/cm for the first four sampling points while that measured for the discharge of the SURAC was obtained in the order of 3100 μS/cm. The control of the general parameters of the pollution at the point of evacuation point of the releases of the industry SURAC displayed the results in the order of 300 mg O2/l for DCO and 120 mg O2/l for DBO5. From the results obtained at the end of this study, we found that the measured values are higher than those indicated in the standards of the surface water quality grid, which means that the quality of the bottom waters wade Beht varied from bad to very bad.

The problem of agricultural pesticide utilization in the Arab countries is not only an issue of uncontrolled use, but it is also a problem pertaining to the handling, misuse and disposal of unwanted pesticides. Electrochemical measurements were performed using a computer controlled by Potentiostat/Galvanostat model PGZ 100 associated to ‘‘Volta-Master 4’’ software. The chemical oxygen demand  (COD) is measured according to the standard methods for examination of water and wastewater. The COD values were determined by the open reflux, with dichromate titration method. All measurements were repeated in triplicate and all results were observed to be repeatable within a 5 % margin of experimental error. Kinetic studies were carried out to determine the COD reduction efficiency for electrooxidation pesticides at different supporting electrolytes. For this purpose, the removal rate of COD was assumed to obey a first-order kinetic as follows. The influence of the current density on the COD removal during the electrochemical oxidation of pesticide Azoxystrobin was 40 mg L-1 at the BDD anode.

The present study focused on the electrochemical oxidation method to degrade a Fungicide Thiabendazole in an aqueous medium. Galvanostatic electrolysis of Thiabendazole solution was performed on a SnO2 anode. The influence of the electrolyte nature (KCl, NaCl, Na2SO4, and Na2CO3), sodium chloride concentration, and the time of degradation were investigated. The electrochemical treatment process of Thiabendazole was followed by chemical oxygen demand (COD) and UV-visible spectrophotometer measurements. It was observed that the removal of Thiabendazole was only achieved in the case of using NaCl as supporting electrolyte. The results have shown a good degradation of Thiabendazole, which the best obtained conditions for COD (73%) removal on the SnO2 anode are 60mA.cm-2 as current density and 2% of NaCl for four hours as time of treatment.