Synthesis of a new asymmetric semi permeable membrane and based alloy of two polymers PVC and PSU. Application in the treatment of a colored solution.

Dyes are an important in synthetic organic compounds. Are used in large quantities in the textile industries, plastic, cosmetic and tanning, etc. Use of indigoid dyes in textile finishing processes experienced in recent years a strong increase, causing a large volume of wastewater loaded with these dyes. Their release into aquatic systems without any prior treatment causes damage to the environment due to their toxicity, which requires treatment with suitable techniques that respect the environment. However, the complexity of these pollutants and their color greatly affect the effectiveness of treatments applied conventionally. Discoloration tests wastewater of textile industry and some colored solutions were carried out by the ultrafiltration membrane method. During this work, we synthesized a microporous asymmetric membrane alloy polysulfone and polyvinyl chloride. The objective of this work is to show the feasibility of the purification of industrial wastewater charged with indigoid dyes by ultrafiltration technique, using a new organic asymmetric membrane based on a mixture of two thermoplastic polymers, which are polysulfone (PSU) and polyvinyl chloride (PVC). From the results obtained in this work, it is found that the fading rate of the order of 89% corresponds to a membrane pressure of 20 cm Hg, in a basic medium at a pH of 11.80. According to this study, it appears that the operation of this asymmetric membrane based mixture (PSU and PVC) is very effective for the discoloration of a water solution of indigo dyes loaded with

New eco-friendly hydraulic binder based on a combination of inorganic additions and organic admixture: Formulation and Characterization

This work aims to valorize a mineral and a natural resources such as the Limestone Fillers (F-Limi) and the Natural Pozzolan (PN) by introducing them into the formulation of cement and / or concrete matrix, to minimize CO2 emissions into the atmosphere, to reduce the energy consumption and raw materials and as well as, to improve the physical and mechanical properties.In this work, we substituted the clinker by the combination between the F-Lime and NP at 40% by weight of cement with steps of 5% in the presence of two types of superplasticizers. The influences of the incorporation of these additions on the physical properties and mechanical performance of mortar and/or concrete in the fresh cement paste and hardened state were evaluated.The obtained results by different formulations developed to show that the replacement a part of clinker by the combination between the F-Lime and the PN has produced a new hydraulic binder eco-friendly and durable with improving the physical and the mechanical properties, namely increasing the fineness, decreasing the density, reduced the water demand, minimizing the porosity and the capillary absorption. The setting times and the compressive strength have been improved

Comparative study of the influence of inorganic additions on the physical-chemical properties and mechanical performance of mortar and/or concrete

In this work, we studied the comparative between the effect of inorganic additions such as the P.Lime and the PN on the physical-chemical properties of cement and the mechanical performances of mortar and/or concrete, while partially substituting the clinker by these materials, at various percentages ranging from 5% to 40% of each add by weight of cement with an interval of 5%.The obtained results by the different formulations elaborated show that the substitution a part of clinker by PN and/or P.Lime produced a new durable hydraulic binder with the physical-chemical and mechanical properties improved, namely the increases in the fineness by specific surface, the density is decreased, the setting time decreased as a function of the increase in the percentage of P.Lime and increased with the increases in the percentage of PN, the report of water/cement decreased as a function of the mass fraction of PN and increased with the percentage of P.Lime. The compressive strength at a young age (2days), median age (7days) and long term (28days) improve with the percentage of P.Lime and/or PN was increased

Uranium and radium activities measurements and calculation of effective doses in some drinking water samples in Morocco

Purpose: As a way of prevention, we have measured the activities of uranium and radium isotopes (234U, 238U, 226Ra, 228Ra) for 30 drinking water samples collected from 11 wells, 9 springs (6 hot and 3 cold), 3 commercialised mineral water, and 7 tap water samples. Methods: Activities of the Ra isotopes were measured by ultra-gamma spectrometry using a low background and high efficiency well type germanium detector. The U isotopes were counted in an alpha spectrometer.Results: The measured Uranium and radium activities are similar to those published for other non-polluting regions of the world. Except in one commercialised gaseous water sample, and in two hot spring water samples, the calculated effective doses during one year are inferior to the reference level of 0.1 mSv/year recommended by the International Commission on Radiological Protection. Conclusion: These activities don't present any risk for public health in Morocco. The sparkling water of Oulmes is occasionally consumed as table water and waters of warm springs are not used as main sources of drinking water.

Uranium and radium activities measurements and calculation of effective doses in some drinking water samples in Morocco

Purpose: As a way of prevention, we have measured the activities of uranium and radium isotopes (234U, 238U, 226Ra, 228Ra) for 30 drinking water samples collected from 11 wells, 9 springs (6 hot and 3 cold), 3 commercialised mineral water, and 7 tap water samples. Methods: Activities of the Ra isotopes were measured by ultra-gamma spectrometry using a low background and high efficiency well type germanium detector. The U isotopes were counted in an alpha spectrometer.Results: The measured Uranium and radium activities are similar to those published for other non-polluting regions of the world. Except in one commercialised gaseous water sample, and in two hot spring water samples, the calculated effective doses during one year are inferior to the reference level of 0.1 mSv/year recommended by the International Commission on Radiological Protection. Conclusion: These activities don't present any risk for public health in Morocco. The sparkling water of Oulmes is occasionally consumed as table water and waters of warm springs are not used as main sources of drinking water.  </p

Data on effect of a reducer of water and retarder of setting time admixtures of cement pastes and mortar in hardened stat

The aim of this work is to study the influence of the admixture of superplasticizers on the physical properties of cement paste to know the initial and final time, water content and mechanical performance of concrete.In this work we have incorporated an Advanced Superplasticité for Prolonged Slump Retention (ASPPSR402) in the formulation matrix of concrete at different percentages ranging from 0.5% to 5% by weight of cement with a step of 0.5%, while partially substituting the mixing water by the last one to reduce the amount of water used.The obtained results by different prospected formulations show that the admixture of ASPPSR402 in formulations matrix significantly reduces the (Water/Cement “W/C”) ratio. Subsequently, we observed that the initial and final time increases in function of the percentage of ASPPSR402. Similarly, the compressive strength at the young age, median age and long-term has been improved. Keywords: Superplasticizers, Reducer of water, Durable concrete, Retarder of setting, Physical properties, High performance, Compressive strengt