Dynamic adsorption of residual hydrocarbon oil from treated produced water on chitosan.

In this work Chitosan was investigated as an adsorbent for residual oil using real produced water stream from Kuwait oilfields. A laboratory bench-top glass tube column integrated with a dynamic flow loop was used in this investigation. Chitosan grains was packed into the glass tube column and real oily produced water was flowed through the tube. Experiments were performed to analyse the effects of several factor, such as initial oil concentration in the produced water feed, adsorption tube/Chitosan bed height and hydraulic loading, on the overall adsorption of oil from the produced water feed. The experimental data was also modelled using Langmuir and Freundlich isotherms to obtain adsorption capacity and intensity respectively. Experimental adsorption results show that the feed oil concentration was reduced following oil adsorption by Chitosan from 126.40 mg/L to zero until oil breakthrough; concentration of oil in the effluent also increased until full oil loading in the Chitosan adsorption bed; the turbidity of the effluent was reduced from 70.3 NTU to 0.11 NTU which is less than the recommended turbidity level of 0.5 NTU in drinking water. The modelling results show that Chitosan adsorption capacity is significantly dependent on the initial oil concentration and that the intensity of adsorption was generally constant and above unity

Adsorption of proteins to thin-films of PDMS and its effect on the adhesion of human endothelial cells

This paper describes a simple and inexpensive procedure to produce thin-films of poly(dimethylsiloxane). Such films were characterized by a variety of techniques (ellipsometry, nuclear magnetic resonance, atomic force microscopy, and goniometry) and used to investigate the adsorption kinetics of three model proteins (fibrinogen, collagen type-I, and bovine serum albumin) under different conditions. The information collected from the protein adsorption studies was then used to investigate the adhesion of human dermal microvascular endothelial cells. The results of these studies suggest that these films can be used to model the surface properties of microdevices fabricated with commercial PDMS. Moreover, the paper provides guidelines to efficiently attach cells in BioMEMS devices.Fil: Chumbimuni Torres, Karin Y.. The University of Texas at San Antonio; Estados UnidosFil: Coronado, Ramon E.. The University of Texas at San Antonio; Estados UnidosFil: Mfuh, Adelphe M.. The University of Texas at San Antonio; Estados UnidosFil: Castro Guerrero, Carlos. The University of Texas at San Antonio; Estados UnidosFil: Silva, María Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaFil: Negrete, George R.. The University of Texas at San Antonio; Estados UnidosFil: Bizios, Rena. The University of Texas at San Antonio; Estados UnidosFil: Garcia, Carlos D.. The University of Texas at San Antonio; Estados Unido

Dynamic absorption of carbon dioxide on microporous carbons

Adsorption of carbon dioxide on microporous carbon

Organic pollution selective degradation by adsorption on high silica zeolites and regeneration by ozone

This study concerns the treatment of industrial airstreams polluted with volatile organic compounds (VOCs), and focuses on highlighting the experimental feasibility of a new hybrid process combining VOC adsorption on hydrophobic zeolites and regeneration by an ozonated airstream in a single reactor. A preliminary study of high-silica zeolites has shown the different kinds of interactions between gaseous ozone and two mineral zeolitic adsorbents, a faujasite Y (FauY) and a ZSM-5 type silicalite (SilZ), and the conservation of the solids adsorption properties (capacities and selectivity) after their contact with ozone. Here, results concerning the contact of gaseous ozone and zeolites saturated with adsorbed VOC are presented. Using temperature measurements inside the fixed bed, oxidation of two models VOC, methyl ethyl ketone (MEK) and toluene (TOL), was observed on both zeolites. Adsorbents were fully regenerated, and the adsorption capacities of the zeolites after their contact with ozone were not affected when used in a discontinuous adsorption / oxidation mode. In addition, the adsorbed VOC were totally mineralized. Detection and identification of oxidation sub-products traces using mass spectrometer - gas chromatography (formic, oxalic, acetic acids, and acetaldehyde for TOL and 2,3-butanedione and acetic acid for MEK) makes possible the indentification of oxidative species. Moreover, a mass balance on oxygen showed that all the produced ozone was used for organic compounds oxidation. There was no or very little ozone lost via side-effect decomposition/deactivation mechanisms. At last, using the zeolites selectivity determined in a previous study toward a binary MEK-TOL mixture, the adsorption / ozonation cyclic process enables the recovery of the minor compound and the selective oxidation of the other component. The great interest of this new process is clearly highlighted, and the technology transfer to industrial operating plants is now studied

Étude de la Cinétique d’adsorption des molécules anti paludéennes par les résines

Objectives: This paper presents experimental results of static and dynamic adsorption of molecules of chloroquine sulfate by DOWEX 50 W, with the aim of proposing a technique to purify the blood content of certain drugs overdose in the body. Methodology: This study is a model of in vitro experiments. The dynamic adsorption simulates the elimination of drugs from blood, and the static adsorption simulates the elimination of drugs from stomach. Chloroquine adsorption tests were conducted by different resins to determine which has the best adsorptive as regards chloroquine. The influence of different parameters (mass of adsorbent, initial concentration, temperature, pH, flow rate) on the adsorptive resins was also studied. Results: The adsorption Kinetics of this drug depends on the balance between adsorbed and free substance in the solution. The influences of initial concentration (Co) of the drug, the mass of the resin, the temperature and the pH of the solution have been evaluated. The quantities of adsorbed chloroquine sulfate decreases. The different results obtained, in this in vitro modeling, can confirm the probable role of the resin in the elimination of a drug from blood, stomach or duodenum. Key words: modelisation, dynamic adsorption; chloroquine sulfate; resin DOWEX 50W; Kinetic constant J. Appl. Biosci. 201

Study on Dynamic Adsorption for BaS04 Inorganic Scaling

The technology to prevent the deposition of barium sulphate is still becoming a major challenge nowadays despite the modem equipment applied in the petroleum industry. Barium sulphate is a common downhole scale type in oil and gas wells with sea water that can reduce wells productivity. Scale inhibitor (SI) chemical treatment is the most common technique which has been applied successfully in oilfields over many years in order to prevent the formation of mineral scale. However, guidelines have been put in place to restrict the use and discharge of potentially toxic chemicals into the sea. The main objectives of this project are to analyze the two common scale inhibitors i.e. phosphonate, DTPMPA and polyaspartate, PASP and to study PASP competitiveness as a green scale inhibitor by observing samples morphology using Scanning Electron Microscopy, SEM and its permeability using Benchtop Permeability System, BPS. Several papers were referred, namely SPE 87453 and SPE 29002 as well as from Journal of Petroleum Science 6 and Engineering by Amer Badr Bin Merdhah et al7 (2010). Based on experiments conducted, the two Sis are compared and discussed