Effects of operating conditions on the salt rejection of nanofiltration membranes in reactive dye/salt mixtures

Koyuncu, İsmail; Topacik, D.

doi:10.1016/s1383-5866(03)00088-1

Cited by 92 publications

(26 citation statements)

References 33 publications

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“…When comparing these results to the clean water permeabilities (Table 3) of TFC-SR (12.3), NF70 (2.6) and NF90 (3.6), it is clear that the salt concentration has little influence on the flux in the range of 0 to 200 ppm, while it has been shown that flux in NF membranes decreases at high (20-80 g/L) NaC1 concentrations [21]. In the case of TFC-SR the permeability even increased slightly for this concentration range.…”

Section: Charged Solute Rejection" Single Saltsmentioning

confidence: 93%

Salt rejection in nanofiltration for single and binary salt mixtures in view of sulphate removal

et al. 2005

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Three commercial membranes (NF70, NF90 and TFC-SR) were firstly characterized in terms of pure water flux and the: rejection of uncharged (alcohols and sugars) compounds. Subsequently, the rejection of monovalent (sodium and chloride) and divalent (calcium and sulphate) ions in single (NaC1, CaC12 and Na2SO4) and binary (NaC1/Na2SO4, CaClJCaSO4, NaC1/CaC12 and Na2SO4/CaSO4) salt mixtures was studied. According to the pure water permeability the TFC-SR membrane is a loosely packed NF membrane (12.3 L.m-2.h-1.bar-1 ), while both NF70 and NF90 are tightly packed (2.6 and 3.6 L.m-2.h" 1.bar-I). According to the uncharged solute rejection, the MWCO~70 = 60, MWCO~9o = 200 and MWCOrFc.sR > 500. NF70 and NF90 were equally efficient in rejecting 1-2, 1-1 and 2-1 salts (>90%), while TFC-SR showed typical negatively charged surface behaviour, i.e., R (1-2) salt > R (1-1) salt > R (2-1). Sulphate rejectkm decreased in the presence of sodium chloride more significantly than in the presence of calcium chloride due to the more efficient retention of the bivalent calcium.

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Section: Charged Solute Rejection" Single Saltsmentioning

confidence: 93%

Salt rejection in nanofiltration for single and binary salt mixtures in view of sulphate removal

et al. 2005

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“…For crossflow NF/RO, the predominant operation mode, crossflow velocity has a significant effect on concentration polarization and the ensuing permeate flux decline in addition to pressure (Bhattacharjee et al, 1999). For example, Koyuncu and Topacik (2003) observed that increased crossflow velocity resulted in higher rejection of NaCl, which was attributed to less concentration polarization under high crossflow conditions.…”

Section: Influence Of Operating Parametersmentioning

confidence: 99%

Removal of fluoride and uranium by nanofiltration and reverse osmosis: A review

2014

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“…The textile industry is notable among the industries that produce effluents with high pollution loads, commonly composed of organic molecules and complex salts (Koyuncu and Topacik, 2003). The environmental problems caused by dyeing effluents are even more serious when unfixed or non-degraded dyes from conventional treatment processes are discharged, since they have a potentially high environmental impact on water bodies due to their toxicity (Maurya et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of the Dye Reactive Blue 5g in Retorted Shale

Lambrecht

Barros

Arroyo

et al. 2015

Braz. J. Chem. Eng.

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-In this study the influence of the volumetric flow rate and feed concentration was investigated for the adsorption of the reactive dye Blue 5G. Experiments were carried out in a bed packed with retorted shale, at 30 o C. The ranges investigated were flow rate 2 -10 mL/min and the feed concentration 13-105 mg/L. Mathematical models were used to represent the dynamic sorption. The double resistance model considers the effects of the axial dispersion and the mass transfer resistance of the external film and inside the particles. As a result, the mass transfer coefficient of the external film and the internal mass transfer coefficient were estimated. The Thomas model was used to simulate the experimental data. In this model the fitted parameter was the adsorption kinetic constant. The first model provided an acceptable representation of the dynamic uptake of the reactive dye Blue 5G.

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Effects of operating conditions on the salt rejection of nanofiltration membranes in reactive dye/salt mixtures

Cited by 92 publications

References 33 publications

Salt rejection in nanofiltration for single and binary salt mixtures in view of sulphate removal

Salt rejection in nanofiltration for single and binary salt mixtures in view of sulphate removal

Removal of fluoride and uranium by nanofiltration and reverse osmosis: A review

Adsorption of the Dye Reactive Blue 5g in Retorted Shale

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