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  • 1.
    Ambashta, Ritu D.
    et al.
    Bhabha Atom Res Ctr, India.
    Bhatnagar, Amit
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Sillanpää, Mika E. T.
    Lappeenranta Univ Technol, Finland.
    Supported iron-based catalysts under influence of static magnetic field for the removal of TBP and EDTA2015In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 54, no 10, p. 2700-2709Article in journal (Refereed)
    Abstract [en]

    Zerovalent metals offer decontamination of organic toxins in aqueous medium. In the present study, alumina-based iron and iron-nickel in the presence and the absence of magnetic field for the decontamination of tributyl phosphate (TBP) and ethylene diamine tetraacetic acid (EDTA) has been compared. TBP decontamination was improved in the presence of zerovalent metals. EDTA decontamination was not enhanced in the presence of zerovalent metals. The decontamination of TBP using iron-based alumina was higher than iron-nickel. The surface interaction on alumina surface, as characterized by attentuated total reflectance-Fourier transform infrared spectroscopy, and the surface interaction on metallic elements, as characterized by evaluating the magnetic moment values helped to understand the reason for the difference in role of alumina-based iron and iron-nickel on decontamination of TBP and EDTA.

  • 2.
    Daneshvar, Ehsan
    et al.
    Isfahan Univ Technol, Dept Fisheries, Fac Nat Resources, Esfahan, Iran.
    Kousha, Masoud
    Isfahan Univ Technol, Dept Fisheries, Fac Nat Resources, Esfahan, Iran.
    Sohrabi, Mohammad Salar
    Isfahan Univ Technol, Dept Fisheries, Fac Nat Resources, Esfahan, Iran.
    Panahbehagh, Bardia
    Kharazmi Univ, Fac Math & Comp Sci, Tehran, Iran.
    Bhatnagar, Amit
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Younesi, Habibollah
    Tarbiat Modares Univ, Fac Nat Resources, Dept Environm Sci, Noor, Iran.
    Sternberg, Steven P. K.
    Univ Minnesota, Dept Chem Engn, Duluth, MN 55812 USA.
    Application of response surface methodology for the biosorption of Acid Blue 25 dye using raw and HCl-treated macroalgae2015In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 53, no 6, p. 1710-1723Article in journal (Refereed)
    Abstract [en]

    The present study was conducted to optimize the various experimental conditions, such as biomass loading, initial C.I. Acid Blue 25 (AB25) dye concentration, and initial solution pH for biosorption of dye on raw and HCl-treated brown alga, Padina australis and red alga, Jania adhaerens. Biosorption process was optimized in a batch system under Box-Behnken design. Second-order polynomial equation was successfully used to describe the effects of studied variables on response. The quadratic models exhibited higher R-2 values, significant p-values, and insignificant lack-of-fit p-values showed high adequacy for predicting the response. Chemically modified red alga exhibited better AB25 dye biosorption capacity as compared to modified brown alga. Maximum dye removal efficiencies of 77.34, 71.28, 50.56, and 85.19% for P. australis, HCl-treated P. australis, J. adhaerens, and HCl-treated J. adhaerens, respectively, were obtained at optimal conditions. The surface modification on tested algal biomass was found to be strongly dependent on their cell wall constituents.

  • 3.
    Hansson, Henrik
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Marques, Marcia
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Rio de Janeiro State Univ, Brazil.
    Laohaprapanon, Sawanya
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Hogland, William
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Electrocoagulation coupled to activated carbon sorption/filtration for treatment of cleaning wastewaters from wood-based industry2014In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 52, no 28-30, p. 5243-5251Article in journal (Refereed)
    Abstract [en]

    The objective of this investigation was to study the use of a coupled treatment (electrocoagulation(EC) and sorption/filtration treatment) with different sequencing to reduce the organic pollutantsmeasured as chemical oxygen demand (COD) of five highly polluted wastewater streamsgenerated after washing surfaces and machinery in the wooden floor industry and to evaluate,how different sequencing of these treatment units affects the overall system efficiency. On thebasis of preliminary studies, an EC reactor (1.0 L) was constructed with monopolar electrodes inparallel connection in an array of four Al electrodes with surface area of 93.2 cm2and an appliedcurrent density of 161 A m–2. This reactor was coupled to a sorption/filtration unit with coalactivated carbon. The EC reactor was tested in two different sequences (before and after the sorption/filtration unit). The overall COD reduction varied from 2% ± 0.5% to 77% ± 2.9%, dependingon the sequence and the treated wastewater stream. The best result from efficiency andoperational viewpoints was obtained with the EC reactor placed after the sorption/filtrationcolumn. The increase in efficiency is likely to be due to the removal by sorption in the activatedcarbon of compounds that interfere with EC. Additionally, as desired, the use of EC before thesorption unit extended the activated carbon lifetime.

  • 4. Koutahzadeh, N.
    et al.
    Daneshvar, E.
    Kousha, M.
    Sohrabi, M. S.
    Bhatnagar, Amit
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Biosorption of hexavalent chromium from aqueous solution by six brown macroalgae2013In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 51, no 31-33, p. 6021-6030Article in journal (Refereed)
    Abstract [en]

    The biosorption potential of six brown macroalgae viz. Nizamuddina zanardinii, Stoechospermum marginatum, Cystoseira indica, Dictyota cervicornis, Padina australis, and Sargassum glaucescens, for the removal of hexavalent chromium (Cr(VI)) was investigated in the present study. Optimum conditions were determined by studying the effect of initial solution pH, biomass dosage, initial Cr(VI) concentration, and contact time on Cr(VI) removal by the macroalgae. Cr(VI) sorption was found to be highly pH dependent and maximum sorption was obtained at pH 1.0. Freundlich isotherm model showed the best fit with the equilibrium data. The removal rate of Cr(VI) was relatively rapid during the first 30min, although the rate decreased gradually and the sorption reached equilibrium in about 70min for S. marginatum, 90min for N. zanardinii, and 150min for D. cervicornis, P. australis, S. glaucescens, and C. indica. Different kinetic models such as pseudo-first-order, pseudo-second-order, and intra-particle diffusion model were tested, and the experimental data was in agreement with the pseudo-second-order model. The results of the present study suggest that brown macroalgae could be used as effective biosorbents for Cr(VI) removal from aqueous solution.

  • 5. Santo, C.E.
    et al.
    Vilar, V.J.P.
    Bhatnagar, Amit
    Univ Porto, Fac Engn, LSRE LCM, LSRE Associate Lab, P-4200465 Oporto, Portugal.
    Kumar, E.
    Botelho, C.M.S.
    Boaventura, R.A.R.
    Sulphide removal from petroleum refinery wastewaters by catalytic oxidation2012In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 46, no 1-3, p. 256-263Article in journal (Refereed)
    Abstract [en]

    The catalytic oxidation of sulphides present in oil refinery wastewaters was investigated in the present study. The wastewaters were obtained from the wastewater treatment plant of the oil refinery in Matosinhos (Portugal), Galp Energia. Air, NaOCl and H2O2 were chosen as oxidants and Fe3+ and Mn2+ as the two catalysts to assess the effective combination of catalyst-oxidant for sulphide removal after oil separation in parallel plate interceptors. Primarily, air (oxygen) was used as the oxidant and the efficiency of two catalysts (Fe3+ and Mn2+) for sulphide removal was evaluated. Experimental data suggested that Fe3+ catalysed sulphide removal in the presence of oxygen was more effective than Mn2+ catalysed reaction. In a subsequent study, oxygen was replaced by NaOCl and H2O2, and the potential of various catalyst-oxidant combinations, NaOCl + [Fe3+], NaOCl + [Mn2+], H2O2 + [Fe3+], H2O2 + [Mn2+], was assessed. The NaOCl + [Fe3+] combination achieved the maximum sulphide oxidation. Pseudo-first-order and pseudo-second-order reaction models were fitted to the kinetic experimental data. The influence of temperature on the kinetic rate was also investigated.

  • 6.
    Svensson, Henric
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Marques, Marcia
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Rio de Janeiro State University, Brazil.
    Svensson, Britt-Marie
    Kristianstad University, Sweden.
    Mårtensson, Lennart
    Kristianstad University, Sweden.
    Bhatnagar, Amit
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Hogland, William
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Treatment of wood leachate with high polyphenols content by peat and carbon-containing fly ash filters2015In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 53, no 8, p. 2041-2048Article in journal (Refereed)
    Abstract [en]

    In the present study, two combinations of filter materials in filter/columns were examined for removal of total organic carbon (TOC) and polyphenols (PP) found in storm water runoff from wood storage areas in a wooden floor industry. One filter/column was packed with peat mixed with carbon-containing fly ash, while another filter/column contained only peat (without ash). The mixture of peat and ash has shown faster and higher removal capacity for TOC and faster removal with the same final removal capacity for PP (in grams of pollutant per kg of sorbent) at the saturation point. The superiority observed for the peat and ash filter is presumably due to the unique characteristics of peat and ash, which enhanced the treatment efficiency when used together in a mixture. Based on the observed results, filters formed by peat and carbon-containing ashes proved to be a potentially low-cost option for the treatment of storm water generated at storage areas of wood materials such as logs, sawdust and wood chips.

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