Showing papers in "Separation and Purification Technology in 2004"

TL;DR: In this article, the development, design and applications of electrochemical technologies in water and wastewater treatment are reviewed with particular focus on electrodeposition, electrocoagulation, electroflotation (EF), and electrooxidation.

TL;DR: In the case of metal anions, the metal cations can be adsorbed by chelation on amine groups of chitosan in near neutral solutions as discussed by the authors.

TL;DR: In this paper, the effect of adsorbent dose, solution pH, and contact time has been investigated to remove arsenite ions [As(III)] by activated alumina.

TL;DR: In this paper, a simplified operating cost analysis for the treatment of a textile wastewater by Electrocoagulation using iron and aluminium electrode materials has been discussed, and the effects of various parameters such as wastewater conductivity and pH, current density and operating time, on the operating cost have been discussed for two electrode materials, separately.

TL;DR: In this article, the authors studied 2,4-dichlorophenoxy-acetic acid (2,4D) adsorption on granular activated carbon in aqueous solution in a batch system with respect to pH, temperature and initial 2.4-D concentration.

TL;DR: In this article, the thermal power plant waste material, bottom ash, was utilized as a potential adsorbent for the toxic textile dye "malachite green" and the data obtained was successfully used to equate Langmuir and Freundlich adsorption isotherm models.

TL;DR: In this paper, the adsorption ability of Turkish tea waste (fibrous) obtained from various tea-processing factories was investigated for the removal of Cu(II and Cd(II) from single (non-competitive) and binary (competitive) aqueous systems.

TL;DR: In this paper, the removal of chemical oxygen demand (COD), color and suspended solid (SS) from olive oil mill wastewater (OMWW) was experimentally investigated by using electro-coagulation (EC).

TL;DR: In this article, the removal of ammonium ions from wastewater using a naturally occurring zeolite from Dogantepe region in Turkey was investigated, both batch and column experiments were carried out.

TL;DR: In this article, the preparation and utilization of coffee residues binding with clay as adsorbent (hereafter called CC-adsorbent) for removal of heavy metal ions in solution was investigated.

TL;DR: In this article, an overview of the work carried out on the development of amides/diamides as alternate extractants in the back end of fuel cycle has been given, where a straight chain amide, viz. N,N-dihexyl octanamide (DHOA) is a promising alternate to tri-n-butyl phosphate (TBP) in the reprocessing of irradiated uranium-based fuels.

TL;DR: In this article, a batch adsorption experiment was carried out to remove benzene, toluene, and phenol from aqueous solution using the above-mentioned organo-zeolites.

TL;DR: In this article, the authors examined whether imidazolium-based ionic liquids can replace conventional organic solvents in the extractive fermentation of lactate by investigating their extraction behaviors and solvent toxicity.

TL;DR: In this article, the initial fly ash carbon sorbents were generated by the chemical treatment of carbon-enriched fly ash concentrates with a 3-chloropropylamine-hydrochloride (CPAHCL) solution at 25 C.

TL;DR: In this article, the effects of surfactant-to-dye concentration ratio in the feed and the transmembrane pressure drop on permeate flux and observed retention of the dye have been studied as a function of the operating time.

TL;DR: In this paper, a bipolar electrocoagulation and electroflotation process was developed to treat laundry wastewater, which was carried out simultaneously in a single reactor with different operating parameters such as initial pH, hydraulic residence time (HRT) and current density.

TL;DR: In this paper, crosslinked polyion complex membranes made by blending 84% deacetylated chitosan and sodium alginate biopolymers followed by crosslinking with glutaraldehyde were tested for the separation of ethanol-water mixtures.

TL;DR: In this article, a new approach to obtain relatively high adsorption capacity utilizing wheat bran as a natural metal adsorbent was developed, which was achieved in about 10 min for all studied cations.

TL;DR: In this paper, an economic analysis was performed comparing different processes for the dehydration of isopropanol/water, and it was found that the hybrid system distillation-pervaporation with ceramic membranes was the most interesting process from economic point of view and could lead to a saving in total costs of 49% compared to azeotropic distillation.

TL;DR: In this paper, the authors evaluated the critical entry pressure, contact angle and critical solvent surface tension properties of polypropylene membranes and solvents for various membrane and solvent combinations for the case of bulk CO2 removal.

TL;DR: In this article, the authors used spent brewery grains (SBG), a byproduct of the brewing process, as an adsorbent of acid orange 7 dye (AO7), a mono-azo acid dye currently used in paper and textile industries.

TL;DR: In this paper, the competitive biosorption of two metal ions together, Cd (II) and Pb (II), by Phanerochaete chrysosporium, a filamentous fungus, under optimum conditions determined for each metal ion was investigated in terms of equilibrium isotherm and adsorption yield.

TL;DR: In this article, the removal of pollutants from acid mine drainage using metallurgical by-product slags was studied in laboratory scale, where the calcium glass type of slags had high surface area and porosity.

TL;DR: In this article, the effects of current density and electrode material on the removal of suspended solids, sulphides, chromium, COD and other pollutants have been discussed and the kinetics of flotation by electrolytically generated bubbles was also studied and found to obey first order rate expression.

TL;DR: In this paper, two abatement techniques, namely, adsorption by activated carbon fiber (ACF) and condensation at cryogenic temperatures for controlling emissions of volatile organic compounds (VOCs), were described.

TL;DR: In this article, the authors investigated the effect of ultrasonics on the cleaning of whey-fouled membranes and examined the variables that influence this effect, concluding that the use of ultrasonic treatment enhances the flux recovery following fouling.

TL;DR: In this article, a two-shape extraction model is proposed and compared with experimental data, which includes the shape factor of the particles population composed of stems and leaves (cylinders and plates).

TL;DR: In this article, the authors studied the equilibrium and kinetics of CO2 sorption on pure lithium zirconate, potassium doped lithium-zirconates, and potassium-doped lithium yttrium-zIRconate and modeled by gas-solid reaction equilibrium and a simple diffusion model based on the double shell CO 2 sorption mechanism.

TL;DR: In this paper, activated carbon was prepared from charcoal by chemical activation and was shown to be a good adsorbent for uranium from liquid aqueous radioactive wastes, the adsorption of uranium was studied as a function of pH, concentration of adsorbate, shaking time, particle size, amount of adorbent and temperature ΔH° and ΔS°.

TL;DR: In this paper, a study of the treatment of synthetic wastewater containing cadmium and cyanide using a laboratory-scale five-compartment electrodialysis cell is presented.