III Articles

  • Preliminary studies of the oxidation of arsenic(III) by potassium ferrate

    Potassium ferrate was synthesized using ferric chloride, and its effects on the oxidation of arsenic(III) in water treatment were investigated. Under given coagulation conditions, the effects of several factors on arsenic oxidation efficiency were examined, which include the mole ratio of Fe(VI) and As(III) added in water and the time elapsed between the addition of potassium ferrate and the ...


    By Inderscience Publishers

  • Influences of soil properties on chromium (iii) sorption

    The presence of chromium in the environment is widespread due to its usage in many industrial processes. The metallurgic, tanning and plating industries are just a few examples of applications which use chromium on a daily basis (Nriagu and Nieboer, 1988). Chromium is stable in 2 oxidation states: cationic Cr with a valence of 3 and anionic with a valence of 6. Chromium (III) is often considered ...


    By University of Tehran

  • Arsenic(III) removal by adsorption on sawdust carbon

    Studies on the removal of As(III) by adsorption on sawdust and sawdust carbon have been carried out at room temperature (25 ± 1°C). The adsorption isotherm of As(III) on sawdust carbon was obtained in a batch reactor. The process of uptake follows the first-order adsorption rate expression and obeys the Langmuir and Freundlich model of adsorption. The mass transfer coefficients as a function of ...


    By Inderscience Publishers

  • Supported liquid membrane system for Cr(III) separation from Cr(III)/Cr(VI) mixtures

    This paper presents the results of analyses of the chromium(III) transport process from mixtures of Cr(III)/Cr(VI) ions using supported liquid membranes (SLM), in which dinonylnaphthalene sulfonic acid (DNNSA) and di(2-ethylhexyl) phosphoric acid (D2EHPA) were used as carriers. In both cases the membrane worked as a selective barrier for Cr(VI) ions. The increase in both the time of Cr(VI) ...


    By IWA Publishing

  • Degradation of bisphenol A in water by Fe(III)/UVA and Fe(III)/polycarboxylate/UVA photocatalysis

    The photodegradation of the endocrine disrupting chemical Bisphenol A (BPA) under UVA irradiation in the presence of Fe(III) or Fe(III)-polycarboxylate systems was studied. The effect of Fe(III) concentration, aqueous pH and the presence of four carboxylic acids (oxalic, malic, tartaric and citric) were investigated. The Fe(III)/UVA system was able to effectively degrade BPA at pH 3 but failed at ...


    By IWA Publishing

  • Removal of chromium(III) from water samples by a low-cost sorbent: application to a mixture of chromium(III) and chromium(VI)

    Adsorption of Cr(III) and Cr(VI) ions from aqueous solutions and water samples has been investigated using Powdered Marble Waste (PMW). The effect of solution pH, initial metal concentration, sorbent dose, shaking time, temperature, and foreign ions on the adsorption of Cr(III) was studied. It was found that the sorption capacity increased with the increase of Cr(III) concentration and ...


    By Inderscience Publishers

  • City of High Point’s experience with bid-to-goal project – round III

    After being initially contacted by private vendors offering to provide proposals for operations of the City’s wastewater facilities, the City of High Point chose to remain in strong support of continued public control and adopted a new approach, Bid-to-GoalSM, to achieve a competitive level of operation. To date, six Divisions of the City have signed their Memorandum of Understanding (MOU) ...

  • Adsorption of hexavalent chromium by crosslinked chitosan–iron(III) in an air-lift reactor

    Column experiments were conducted in an airlift reactor containing a certain amount of crosslinked chitosan–iron(III) (Ch-Fe), to examine the effects of adsorbent mass, flow rate, and influent concentrations on Cr(VI) removal. The breakthrough time increased with an increase in Ch-Fe mass, but decreased with an increase in initial Cr(VI) concentration. The exhaustion time decreased with an ...


    By IWA Publishing

  • Comparison of spectrometry with arsenazo III and neutronic activation for U and Th determination in phosphogypsum

    Phosphogypsum is a byproduct from the phosphoric acid industry which is formed by crystallisation during sulfuric acid attack on phosphate rocks. While the composition of phosphogypsum is dihydrated calcium sulphate, the material can contain high levels of impurities that exist in phosphate rocks, such as radionuclides from the 238U and 232Th series. The most common way of disposing of ...


    By Inderscience Publishers

  • Introducing LaserGas III SP CO – a combustion analyzer for rough environments

    NEO Monitors unveils the industry’s most compact CO combustion analyzer suitable for the most demanding environments. LaserGas III CO includes measurement of CH4, H2O and temperature in one single unit designed to reduce risk. Based on decades of experience and customer feedback, NEO Monitors has designed an Ex-d certified tunable diode laser (TDLS) analyzer. The instrument is ...


    By NEO Monitors AS

  • Modeling of breakthrough curves for aqueous iron (III) adsorption on chitosan-sodium tripolyphosphate

    A fixed bed column packed with chitosan-sodium tripolyphosphate (CTPP) beads was used to remove aqueous Fe (III) ions. The adsorption of Fe (III) ions on CTPP beads was found to be dependent on operating conditions, such as the flow rate, adsorbent bed length, and feed concentration. The experimental data were assessed with Thomas, Adams-Bohart and Yoon-Nelson models to predict the ...


    By IWA Publishing

  • Adsorptive removal of As(III) from aqueous solution by waste litchi pericarps

    The present study investigated the removal of arsenite anions (AsO33−, referred to as As(III)) from aqueous solutions by waste litchi pericarps (LPs). Influential factors such as the adsorbent dose, contact time, solution pH, and initial As(III) concentration were investigated. The optimum conditions for As(III) adsorption by the LPs occurred at a contact time of 60 min, adsorbent dose ...


    By IWA Publishing

  • CAT III Runway Visual Range System at Newcastle Airport

    Newcastle International Airport recently became the first airport in the UK to achieve Category III status for the use of forward scatter meter runway visual range equipment.  This significant achievement was made by NATS and AGI Ltd using Biral's VPF-730 forward scatter sensors. The ability to a runway to operate in reduced visibility conditions is determined by the installed landing ...

  • Noor II and Noor III eye cost savings from site integration

    With similar timeframes and a shared site, the Noor II and Noor III CSP projects in Morocco’s Noor Ouarzazate Solar Complex are expected to gain from multiple synergies during both construction and operations, Badis Derradji, ACWA Power’s managing director for Morocco, told CSP Today. Parallel construction on the two projects is bringing considerable cost benefits, even though ...


    By FCBI Energy

  • On-line optical determination of floc size of Fe(III) coagulants

    This study investigated the floc aggregation, average floc size, floc size variance and floc growth velocity when ferric chloride (FeCl3) and polyferric chloride (PFC) were used to treat the simulated water samples. The factors including coagulant dose, ionic strength and solution pH, which affect the floc aggregation, were studied. Experiments were carried out in a bench-scale reactor using ...


    By IOS Press

  • Towards a new scheme for parametrisation of deep convection in NAME III

    This paper describes an updated scheme for parametrisation of atmospheric convection to be used in the Met Office Atmospheric Dispersion Model (NAME III). In this scheme, the vertical transport of particles due to convection is represented in a 1-dimensional model based on a ‘mass-flux’ approach. Empirical formulas are used to obtain the mass fluxes and the convective precipitation is used for ...


    By Inderscience Publishers

  • Adsorption characteristics of bio-adsorbent on chromium(III) in industrial wastewater

    The removal of chromium(III) (Cr(III)) from industrial wastewater by various low-cost methods has been widely investigated. In this paper, a type of bio-adsorbent was prepared using rice straw modified by fermentation and simple chemical treatment. The aim is to detect the adsorption mechanism and characteristics on Cr(III) ions. The analysis shows that the bio-adsorbent possesses four ...


    By IWA Publishing

  • Adsorption characteristic of As(III) on goethite waste generated from hydrometallurgy of zinc

    In this paper, goethite waste from hydrometallurgy of zinc was used as a raw material for arsenic adsorbent preparation. The goethite waste adsorbent (GWA) was characterized with scanning electron microscope (SEM), X-ray powder diffraction (XRD), and particle size distribution analysis. The adsorption of As(III) on GWA was studied as a function of contact time, pH, and coexisting anions. The ...


    By IWA Publishing

  • Adsorption of hexavalent chromium onto organic bentonite modified by the use of iron(III) chloride

    The adsorption of hexavalent chromium (Cr(VI)) was improved by using organic bentonite (OB) modified with iron(III) chloride. The adsorption mechanisms and characteristics of OB and organic bentonite modified by FeCl3 (FMOB) were studied by using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy (EDS). It was found ...


    By IWA Publishing

  • Catalytic wet peroxide oxidation of p-nitrophenol by Fe (III) supported on resin

    FeIII supported on resin (FeIII-resin) as an effective catalyst for peroxide oxidation was prepared and applied for the degradation of p-nitrophenol (PNP). Catalytic wet peroxide oxidation (CWPO) experiments with hydrogen peroxide as oxidant were performed in a batch rector with p-nitrophenol as the model pollutant. Under given conditions (PNP concentration 500 mg/L, H2O2 0.1 M, ...


    By IWA Publishing

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