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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Membrane Water Treatment
Journal Basic Information
Journal DOI :
Editor in Chief :
Enrico Drioli / Young Chul Choi / Ruey-Shin Juang
Volume & Issues
Volume 1, Issue 4 - Oct 2010
Volume 1, Issue 3 - Jul 2010
Volume 1, Issue 2 - Apr 2010
Volume 1, Issue 1 - Jan 2010
Selecting the target year
Application of membrane distillation process for tap water purification
Gryta, Marek ;
Membrane Water Treatment, volume 1, issue 1, 2010, Pages 1~12
DOI : 10.12989/mwt.2010.1.1.001
Membrane distillation process was used for purification of pre-treated natural water (tap water). The rejection of inorganic and organic compounds in this process was investigated. The obtained rejection of inorganic solutes was closed to 100%, but the volatile organic compounds (VOCs) diffused through the membrane together with water vapour. The content of trihalomethanes (THMs) in the obtained distillate was two-three fold higher than that in the feed, therefore, the rejection of the total organic compounds present in the tap water was reduced to a level of 98%. The intensive membranes scaling was observed during the water separation. The morphology and composition of the fouling layer was studied using scanning electron microscopy coupled with energy dispersion spectrometry. The influence of thermal water pre-treatment performed in a heat exchanger followed by filtration on the MD process effectiveness was evaluated. This procedure caused that significantly smaller amounts of
crystallites were deposited on the membrane surface, and a high permeate flux was maintained over a period of 160 h.
A computer simulation of ion exchange membrane electrodialysis for concentration of seawater
Tanaka, Yoshinobu ;
Membrane Water Treatment, volume 1, issue 1, 2010, Pages 13~37
DOI : 10.12989/mwt.2010.1.1.013
The performance of an electrodialyzer for concentrating seawater is predicted by means of a computer simulation, which includes the following five steps; Step 1 mass transport; Step 2 current density distribution; Step 3 cell voltage; Step 4 NaCl concentration in a concentrated solution and energy consumption; Step 5 limiting current density. The program is developed on the basis of the following assumption; (1) Solution leakage and electric current leakage in an electrodialyzer are negligible. (2) Direct current electric resistance of a membrane includes the electric resistance of a boundary layer formed on the desalting surface of the membrane due to concentration polarization. (3) Frequency distribution of solution velocity ratio in desalting cells is equated by the normal distribution. (4) Current density i at x distant from the inlets of desalting cells is approximated by the quadratic equation. (5) Voltage difference between the electrodes at the entrance of desalting cells is equal to the value at the exits. (6) Limiting current density of an electrodialyzer is defined as average current density applied to an electrodialyzer when current density reaches the limit of an ion exchange membrane at the outlet of a desalting cell in which linear velocity and electrolyte concentration are the least. (7) Concentrated solutions are extracted from concentrating cells to the outside of the process. The validity of the computer simulation model is demonstrated by comparing the computed results with the performance of electrodialyzers operating in salt-manufacturing plants. The model makes it possible to discuss optimum specifications and operating conditions of a practical-scale electrodialyzer.
Permeability of anion-exchange membrane for Cl
ions. Dialysis of hydrochloride acid in the presence of nickel chloride
Palaty, Zdenek ; Bendova, Helena ;
Membrane Water Treatment, volume 1, issue 1, 2010, Pages 39~47
DOI : 10.12989/mwt.2010.1.1.039
Using a conventional two-compartment cell with stirrers the separation of an aqueous solution of HCl-
by an anion-exchange membrane Neosepta-AFN was investigated. The dialysis process was characterized by the permeability coefficient of the membrane towards to
ions. This quantity was determined by the numerical integration of equations, which describe the time dependence of the total concentration of
ions in compartment initially filled with stripping agent (water), combined with an optimizing procedure. The analysis of the experimental results showed that this permeability coefficient is a satisfactory characteristic for the process studied. It can be graphically correlated with the initial acid and initial salt concentrations in the compartment initially filled with acid+salt mixture.
Application of response surface methodology in pes/speek blend NF membrane for dyeing solution treatment
Lau, W.J. ; Ismail, A.F. ;
Membrane Water Treatment, volume 1, issue 1, 2010, Pages 49~60
DOI : 10.12989/mwt.2010.1.1.049
In this study, response surface methodology (RSM) was performed in NF membrane process to evaluate the separation efficiency of membrane in the removal of salt and reactive dye by varying different variables such as pressure, temperature, pH, dye concentration and salt concentration. The significant level of both the main effects and the interaction were observed by analysis of variance (ANOVA) approach. Based on the statistical analysis, the results have provided valuable information on the relationship between these variables and the performances of membrane. The rejection of salt was found to be greatly influenced by pressure, pH and salt concentration whereas the dye rejection was relatively constant in between 96.22 and 99.43% regardless of the changes in the variables. The water flux on the other hand was found to be affected by the pressure and salt concentration. It is also found that the model predictions were in good agreement with the experimental data, indicating the validity of these models in predicting membrane performances prior to the real filtration process.
A multi-level approach for the optimization of an ultrafiltration plant processing surface water
Zondervan, E. ; Roffel, B. ;
Membrane Water Treatment, volume 1, issue 1, 2010, Pages 61~74
DOI : 10.12989/mwt.2010.1.1.061
This paper will integrate models at different levels (from filtration, backwashing to chemical cleaning and membrane lifetime) that can be used to minimize overall operating costs of a dead-end ultra filtration process that is used for the purification of surface water. Integration of the models leads to a multi-level optimization problem (at different levels different objectives should be reached). This problem is solved as a MINLP. Systematic modelling and optimization of membrane systems is not extensively discussed in the scientific literature. In this paper the first steps are taken in the formulation of proper models and the use of systems engineering tools to come to real optimal operating conditions. The optimized variables are used to calculate fouling profiles which can subsequently be used as inputs for a control system that actually enforces the profiles to a real pilot plant.
Membrane engineering progresses in desalination and water reuse
Macedonio, Francesca ; Drioli, Enrico ;
Membrane Water Treatment, volume 1, issue 1, 2010, Pages 75~81
DOI : 10.12989/mwt.2010.1.1.075
The aim of this work is to analyse and discuss the use of the Economic Evaluation and of some new "metrics" for an appropriate valuation of membrane operations in the logic of Process Intensification. In particular, the proposed approach has the goal to show how the utilized indicators can drive to the choice of the most convenient process. Although in this work the planned procedure is applied, as a case study, to the membrane-based systems for boron and arsenic removal from waters, the suggested approach can be generally applied to any other process of interest.
Surface modification of polypropylene membrane to improve antifouling characteristics in a submerged membrane-bioreactor: Ar plasma treatment
Zhou, Jin ; Li, Wei ; Gu, Jia-Shan ; Yu, Hai-Yin ;
Membrane Water Treatment, volume 1, issue 1, 2010, Pages 83~92
DOI : 10.12989/mwt.2010.1.1.083
To improve the antifouling characteristics of polypropylene hollow fiber microporous membranes in a submerged membrane-bioreactor for wastewater treatment, the surface-modification was conducted by Ar plasma treatment. Surface hydrophilicity was assessed by water contact angle measurements. The advancing and receding water contact angles reduced after the surface modification, and hysteresis between the advancing and receding water contact angles was enlarged after Ar plasma treatment due to the increased surface roughness after surface plasma treatment. After continuous operation in a submerged membrane-bioreactor for about 55 h, the flux recovery after water cleaning and the flux ratio after fouling were improved by 20.0 and 143.0%, while the reduction of flux was reduced by 28.6% for the surface modified membrane after 1 min Ar plasma treatment, compared to those of the unmodified membrane. Morphological observations showed that the mean membrane pore size after Ar plasma treatment reduced as a result of the deposition of the etched species; after it was used in the submerged membrane-bioreactor, the further decline of the mean membrane pore size was caused by the deposition of foulants. X-ray photoelectron spectroscopy and infrared spectroscopy confirmed that proteins and polysaccharide-like substances were the main foulants in the precipitate.