effluent from ro (reverse osmosis) systems during recovery gradually becomes concentrated and supersaturated with soluble salts such as calcium carbonate (caco3), calcium sulfate (caso4), barium sulfate (baso4) and silica (sio2). thus we were looking for procedures to prevent precipitation of soluble salts on the membrane surface and decrease membrane permeability. therefore, recovery could be ...

thermoluminecsence (tl) characteristics of pure caso4 nanoparticles produced by co-precipitation method are presented. the formation of the nanoparticles was confirmed by x-ray diffraction (xrd) and scanning electron microscope (sem). tl glow curve of this phosphor, exposed to gamma radiation exhibits five overlapping glow peaks in the complex glow curve at 463, 470, 483, 498 and521(k) respecti...

Limestone Chemical Looping Combustion process (LCL-C™) patented by Alstom Power Inc. proposes the formation of a CaSO4 oxygen carrier via sulfur retention when supplying Ca-based sorbent together with sulfurous fuels in fuel reactor. In present research work, four sorbents, three limestones and one dolomite different physico-chemical characteristics, have been evaluated as precursors during con...

Coal-mine effluent treatment has the potential to both reduce environmental impact of and provide economic opportunities by recovering valuable minerals clean water. In this study, we modeled a novel process, which includes nanofiltration (NF), two-step crystallization, reverse osmosis (RO), electrodialysis (ED), multi-effect distillation (MED), NaCl crystallizer, performed techno-economic anal...

According to the classical view, a plant cell is a metabolic microcosm separated from the medium without by a membrane, the plasmalemma, which acts as a permeability barrier to polar solutes including inorganic ions. Many such solutes nevertheless are taken into the cell. This phenomenon is commonlv thought to be due, not to diffusion of the free ions across the plasmalemma, but to the operatio...

A new force field (MSXX FF) was developed for barium sulfate (BaSO4) to reproduce the experimental properties of BaSO4 crystal (density, lattice energy, compressibility, and vibrational spectrum) and to describe properly the interaction between BaSO4 and water (binding energies and interatomic distances of Ba(H2O)8 and (SO4)(H2O)6 clusters determined from ab initio quantum mechanics calculation...