Performance of nanofiltration and reverse osmosis membranes for arsenic removal from drinking water

Elcik, Harun; Çelik, Suna Özden; Çakmakçı, Mehmet; Özkaya, Bestami

doi:10.1080/19443994.2015.1111812

Cited by 50 publications

(11 citation statements)

References 27 publications

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“…The permeate flux rates versus applied pressure for the membranes are presented in Figure 5. This figure also shows that there is a good agreement in the results of the present work with others (Elcik et al, 2015). Maximum fluxes were observed at 1.5 MPa, with treated water, with rates of 20.55 × 10 -6 and 13.44× 10 -6 m.s -1 obtained from NF90 and BW30, respectively.…”

Section: Effects Of Operating Pressure On Permeate Fluxsupporting

confidence: 91%

The Impact of Operational Conditions on Commercial Membranes using in Removing Nitrate from Drinking Water

Harfoush

2020

AQUADEMIA

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It is a great advantage to reduce the energy requirement for the provision of consumable groundwater to an absolute minimum. Reverse osmosis (RO) and nanofiltration (NF) are two of the most commonly used technologies for desalination water to provide potable water with lowest energy consumption. However, there is still lack of a thorough comparison between these two methods providing the better option in different conditions. Therefore, in this paper, nitrate rejection and the effects of operation conditions on the performance of RO and NF systems are compared. Several wells in Zarch District, Iran, are polluted by nitrate and groundwater is a major drinking water source in the region. The aim of this research was to evaluate the efficiency of nitrate removal by two commercial membranes NF90 and BW30 (both Dow Filmtec) using natural water under different operating conditions. Experiments were conducted to assess the influence of temperature and pressure on nitrate removal by the membranes. The results indicated that BW30 (reverse osmosis) performs better removing nitrate than NF90 (Nano-filter). With a feed of 200 mg-NO3-.L-1 (as nitrate), only permeate from the BW30 membrane met the required quality standard for drinking purposes (50 mg-NO3-.L-1). When the feed concentration increased to 250 mg-NO3-.L-1 , both membranes failed to achieve the standard in the permeate. The membranes showed similar nitrate removal behaviour under different applied temperatures and pressures. It was concluded that the BW30 membrane can be used to produce drinking water in the study area with influent concentrations below 200 mg-NO3.L-1 .

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Section: Effects Of Operating Pressure On Permeate Fluxsupporting

confidence: 91%

The Impact of Operational Conditions on Commercial Membranes using in Removing Nitrate from Drinking Water

Harfoush

2020

AQUADEMIA

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“…Various techniques for arsenic removal methods and their technological developments from water and wastewater treatments have been studied such as membrane filtration [4,9], biological processes [10], coagulation-flocculation [11], ion exchange [12,13], and adsorption [14][15][16]. Within these methods, the adsorption has been widely extended as a competitive application for the water and wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Magnetic Xerogel Monolith as an Adsorbent for As(V) Removal from Groundwater

et al. 2021

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Arsenic contamination of groundwater is still a global problem due to the toxicity at low dose on human health confirmed by epidemiological studies. Magnetic xerogel monoliths (MXs) were synthesized by the sol-gel polymerization using resorcinol, formaldehyde, alkaline catalyst and magnetite. The varying molar ratios of magnetite and resorcinol (M/R) in the gel were evaluated for As(V) removal from groundwater. The surface chemistry, structure and morphology of MXs related to arsenic adsorption were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and point of zero charge. Batch adsorption experiments were carried out to investigate the effects of Fe contents, initial pH and adsorbent dose on As(V) removal performance. The MXs with molar ratio of M/R at 0.15 gave the maximum As(V) adsorption capacity and removal with values of 62.8 µg/g and 86.7%, respectively. The adsorption data were well described by the Elovich equation of the kinetic model and the Freundlich isotherm. The thermodynamic studies demonstrated that the adsorption process was endothermic and spontaneous in nature. MXs showed to be a good alternative for As(V) removal from groundwater and achieving the efficient desorption, and thus fulfilled the Mexican standard for drinking water.

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“…They have persistent and non-biodegradable characteristics, which cause environmental pollution in both atmospheric and aquatic environment [4][5][6][7]. Several techniques have been applied for heavy metal removal including adsorption by activated carbon, natural low-cost adsorbents and gamma alumina, ion-exchange system, membrane processes, electrochemical applications [5][6][8][9][10][11][12]. Many studies have demonstrated that nano zero valent iron (nZVI) can effectively be used to remove chrome and arsenic as heavy metals [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Copper Metal Ion from Aqueous Solution by Nanoscale Zero Valent Iron (nZVI) Supported on Activated Carbon

Altuntaş

Debik

Kozal

et al. 2017

PEN

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Copper is from one of the most important heavy metals, which adheres to the ecological system by harmful human activities. It is toxic, persistent, and non-biodegradable metal, which causes environmental pollution in both the atmosphere and aquatic environment. Copper pollution found in undesirable concentrations in industrial wastewaters especially from electronics industries, cooling systems and plating industry. Physical methods are mostly applied to remove Cu(II) including adsorption and membrane processes. Nanoparticles (e.g. nano zero valent iron (nZVI), carbon nanotubes, titanium dioxide nanoparticle) have been considered to be promising alternatives to conventional adsorbents. They have advantages by having more surface area and nano-sized pores, which helps to adsorb more molecules. In this study, in order to enhance adsorption by activated carbon and lower the cost of nanoparticle synthesis, nZVI is synthesized on activated carbon(AC-nZVI). It was investigated for its effectiveness in copper removal from aqueous solution. The effect of AC-nZVI dosage, pH and the initial concentration of Cu were investigated. Adsorption capacities are obtained for nZVI and AC-nZVI as 414 mg/g and 510 mg/g, respectively. 200mg/L AC-nZVI concentration was determined as sufficient for %96 removal rate. Langmuir isotherm gave the best fit and the maximum adsorption capacity according to Langmuir isotherm is calculated as 588,24 mg/g.

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Performance of nanofiltration and reverse osmosis membranes for arsenic removal from drinking water

Cited by 50 publications

References 27 publications

The Impact of Operational Conditions on Commercial Membranes using in Removing Nitrate from Drinking Water

The Impact of Operational Conditions on Commercial Membranes using in Removing Nitrate from Drinking Water

Synthesis and Characterization of Magnetic Xerogel Monolith as an Adsorbent for As(V) Removal from Groundwater

Adsorption of Copper Metal Ion from Aqueous Solution by Nanoscale Zero Valent Iron (nZVI) Supported on Activated Carbon

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