Effect of operating parameters in a submerged membrane adsorption hybrid system: experiments and mathematical modeling

Guo, Wenshan; Shim, Wang Geun; Vigneswaran, S.; Ngo, Huu Hao

doi:10.1016/j.memsci.2004.09.009

Cited by 56 publications

(33 citation statements)

References 17 publications

(17 reference statements)

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“…The mass balance of the nitrate in bulk solution in the membrane reactor was calculated using Equation (5). This model was developed using the concept of a continuous flow stirred tank reactor (CSTR) and by incorporating membrane packing density (A M /V M ) and membrane correlation coefficient (MCC) into the adsorption model [3,13]. The first two terms on the right-hand side of Equation (5) represent adsorption.…”

Section: Mathematical Modelling Of the Results Of Smahsmentioning

confidence: 99%

“…The proportionality is represented by a surrogate parameter of membrane correlation coefficient (MCC). More details are given in the paper of Guo et al [3]. A higher value of MCC indicates a more efficient removal of adsorbate and adsorbent which contained the adsorbate by the membrane [13].…”

Section: Mathematical Modelling Of the Results Of Smahsmentioning

confidence: 99%

“…Although the MF or UF do not remove the nitrate, they can remove suspended solids, colloids, micro-organisms and micro-particles from water. The adsorbents are retained in the reactor [3,4] and kept continuously in suspension via aeration to facilitate increased adsorption of pollutants. The integrated adsorption and membrane filtration system offers several advantages.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Modelling of Nitrate Removal from Water Using a Submerged Membrane Adsorption Hybrid System with Four Adsorbents

et al. 2018

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Excessive concentrations of nitrate in ground water are known to cause human health hazards. A submerged membrane adsorption hybrid system that includes a microfilter membrane and four different adsorbents (Dowex 21K XLT ion exchange resin (Dowex), Fe-coated Dowex, amine-grafted (AG) corn cob and AG coconut copra) operated at four different fluxes was used to continuously remove nitrate. The experimental data obtained in this study was simulated mathematically with a homogeneous surface diffusion model that incorporated membrane packing density and membrane correlation coefficient, and applied the concept of continuous flow stirred tank reactor. The model fit with experimental data was good. The surface diffusion coefficient was constant for all adsorbents and for all fluxes. The mass transfer coefficient increased with flux for all adsorbents and generally increased with the adsorption capacity of the adsorbents.

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Section: Mathematical Modelling Of the Results Of Smahsmentioning

confidence: 99%

Section: Mathematical Modelling Of the Results Of Smahsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mathematical Modelling of Nitrate Removal from Water Using a Submerged Membrane Adsorption Hybrid System with Four Adsorbents

et al. 2018

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“…The resulting equations were then integrated numerically in the time domain. Nelder-Mead simplex algorithm technique (Guo et al 2005), which is based on minimizing the differences between the experimental and predicted adsorption values as a function of time, was used to estimate the values of D s and K f . The minimization of the differences was performed using the following object function:…”

Section: Hsdm Adsorption Kinetics Modelmentioning

confidence: 99%

“…A detailed explanation to this method is given elsewhere (Villadsen and Stewart 1967;Brown et al 1989;Guo et al 2005). …”

Section: Hsdm Adsorption Kinetics Modelmentioning

confidence: 99%

Nitrate removal using Purolite A520E ion exchange resin: batch and fixed-bed column adsorption modelling

Nur

Shim

Loganathan

et al. 2014

Int. J. Environ. Sci. Technol.

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Removing excessive nitrate from water is essential because it causes eutrophication which in turn has a harmful effect on aquatic life, resulting in a reduction in biodiversity and posing a danger to people's health when the water is used for drinking. In this study, nitrate removal from aqueous solutions was studied using an ion exchange resin (Purolite A520E) in batch and fixed-bed column experiments. Batch adsorption kinetics was very well described by pseudo-first-order, pseudo-second-order and homogeneous surface diffusion models for resin doses 1.5 and 3.0 g/L at a nitrate concentration 20 mg N/L. Column kinetic data satisfactorily fitted to the empirical Thomas model and a numerical model based on advectiondispersion equation for filtration velocities 2.5 and 5.0 m/h at a column height of 12 cm and inlet concentration 20 mg N/L. The experimental and Thomas model predicted breakthrough adsorption capacity ranges for the two filtration rates were 12.0-13.5 and 8.2-9.7 mg N/g, respectively, whereas the maximum adsorption capacity determined using Langmuir adsorption isotherm model in the batch study was 32.2 mg N/g.

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Enhancement of Oily Wastewater Treatment by Ceramic Microfiltration Membranes using Powder Activated Carbon

2011

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Results of a hybrid microfiltration-powdered activated carbon (MF-PAC) system for the treatment of synthetic oily wastewaters with mullite and mullite-alumina (50 % alumina content) ceramic membranes are presented. The experiments were conducted to determine the effects of the presence of PAC on MF process performance in terms of flux decline, membrane fouling, and total organic carbon (TOC) rejection. The experimental results demonstrate that PAC addition at low concentration (200-400 ppm) increases permeate flux by 19.6 % for mullite and 61 % for mullite-alumina MF membranes. However, high PAC concentration (1200 ppm) decreases the permeate flux by 22 % for mullite and 25 % for mullitealumina MF membranes. Also, TOC rejection increases from 93.8 to 97.4 % for mullite and from 89.6 to 92.4 % for mullite-alumina MF membranes. IntroductionLow pressure driven membrane separation techniques such as microfiltration (MF) have been considered as indispensable treatment methods in water and wastewater treatment applications to remove specific pollutants which are not normally removed by conventional processes. MF is excellent in removing microparticles, microorganisms, macromolecules, and most bacteria [1]. Ceramic membranes have numerous advantages: stability at high temperature and pressure resistance, good chemical stability, high mechanical resistance, long life, and good antifouling properties. Ceramic MF membranes can be made from alumina, mullite, cordierite, silica, spinel, zirconia, and other refractory oxides. Among these membranes, mullite ceramic membranes have very high chemical and thermal stability, and are very cheap because they can be prepared by extruding and calcining kaolin clay [2].Membrane fouling is characterized, in general, as the reduction of permeate flux through the membrane and, hence, leads to an irreversible loss of system productivity over time, caused by interactions between the membrane and the various components in the process stream. To reduce membrane fouling, some methods can be used. Using adsorbents as pretreatment is one way to minimize membrane fouling. Powdered activated carbon (PAC) 1) has the ability to adsorb primarily the lower molecular weight organic compounds and shows more affinity towards the hydrophobic components. Adsorption using PAC in combination with the membrane MF process can be used as a hybrid system for removing organic materials and improving permeate flux. PAC is generally used as a pretreatment step prior to the membrane operation or in combination with the membrane in a feed tank [3].PAC has been used as membrane pretreatment for both water and wastewater treatment. Kim et al. [4] showed that using PAC with polymeric MF membranes to treat lake water reduces the fouling rate by removing natural organic matter (NOM), compared with the system with no adsorbent. Ince et al. [5] used PAC and polymer membranes in a hybrid system to further reduce the chemical oxygen demand (COD) concentration of the jet-loop membrane bioreactor effluent to meet the COD disc...

show abstract

Effect of operating parameters in a submerged membrane adsorption hybrid system: experiments and mathematical modeling

Cited by 56 publications

References 17 publications

Mathematical Modelling of Nitrate Removal from Water Using a Submerged Membrane Adsorption Hybrid System with Four Adsorbents

Mathematical Modelling of Nitrate Removal from Water Using a Submerged Membrane Adsorption Hybrid System with Four Adsorbents

Nitrate removal using Purolite A520E ion exchange resin: batch and fixed-bed column adsorption modelling

Enhancement of Oily Wastewater Treatment by Ceramic Microfiltration Membranes using Powder Activated Carbon

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