Hydraulic backwashing for low-pressure membranes in drinking water treatment: A review

Chang, Haiqing; Liang, Heng; Qu, Fangshu; Liu, Baicang; Yu, Hui; Du, Xi; Snyder, Shane A.

doi:10.1016/j.memsci.2017.06.077

Cited by 163 publications

(61 citation statements)

References 152 publications

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“…If this TMP parameter is important for the ultrafiltration monitoring process and the benefits in mbar thus recovered is essential for operation cost, it is more difficult to quantify. Hence, Chang et al [4] reported several methods in the literature to quantify the effect of backwash: for a constant flux condition, it is better to use the relationship (5) proposed by Chellam [17] that consider the variation of transmembrane pressure before and after backwash:…”

Section: Air Backwash and Classical Backwashmentioning

confidence: 99%

“…It is necessary to ensure a constant quality water, either at input or output of processes. Conventional water treatment processes are based on several stages, that take more time, have a high footprint on environment, and do not ensure a constant quality of treated water under the variable operating conditions [4,5]. However, ultrafiltration (UF) can clarify and disinfect water [6] more especially for drinking water production from natural water.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies show that air/water backwash is called by many different names, such as air sparging, air/water flushing, air lifting, air scrabbling, air scouring and gas backwash [12,13]. It is proved that this type of backwash including air/water is more efficient than normal backwash because the air help to dislodge the cake of fouling [4,14]. In our knowledge, all papers discuss the use of air while filtration cycle (injection in feed) or during backwash by injection of air simultaneously in water [12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of Air Backwash Frequency during the Ultrafiltration of Seawater

et al. 2020

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The main objective of this paper is to study the effect of new air backwash on dead-end ultrafiltration of seawater with a pilot at semi-industrial scale (20 m3/day). To control membrane fouling, two different backwashes were used to clean the membrane: classical backwash (CB) and new air backwash (AB) that consists of injecting air into the membrane module before a classical backwash. To evaluate the efficiency of AB and CB, a resistance in series model was used to calculate each resistance: membrane (Rm), reversible (Rrev) and irreversible (Rirr). The variation of the seawater quality was considered by integrating the turbidity variation versus time. The results indicate clearly that AB was more performant than CB and frequency of AB/CB cycles was important to control membrane fouling. In this study, frequencies of 1/5 and 1/3 appear more efficient than 1/7 and 1/9. In addition, the operation conditions (flux and time of filtration) had an important role in maintaining membrane performance—whatever the variation of the seawater quality.

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Section: Air Backwash and Classical Backwashmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of Air Backwash Frequency during the Ultrafiltration of Seawater

et al. 2020

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“…The conventional drinking water treatment processes face several obstacles that are seriously affected by water pollution and scarcity, making it difficult to produce drinking water efficiently. Low-pressure membrane filtration, which includes ultrafiltration (UF) and microfiltration (MF), is one of the most promising treatment technologies to improve water quality [1], and one of the alternatives for water disinfection [2,3]. Membrane water treatment devices were once used mainly in desalination projects.…”

Section: Introductionmentioning

confidence: 99%

Performance Study Of The Membrane Based Layered Double Hydroxides ‘ZnAl-Gh’ In The Purification Of Groundwater

Zerhouni¹,

Qabaqous²,

Filali³

et al. 2019

Karbala International Journal of Modern Science

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The objective of this work is focused on the preparation and characterization of plan microfiltration membrane Zn 3 Al-Gh and the study of their efficiency in the treatment of ground water. This membrane was carried by using the support of the clay such as Ghassoul 'Gh' prepared by using dry uniaxial compaction method. The layered double hydroxides (LDH) based on Zn 3 Al-CO 3 with molar ratio (Zn 2+ /Al 3+ =3) was deposited on support by direct co-precipitation method. The characterizations of the membrane LDH-Gh 'Zn 3 Al-Gh' and deposited layer Zn 3 Al-CO 3, was done by scanning electron microscopy analysis (SEM), X-ray diffraction (XRD), porosity and Fourier Transform Infrared Spectroscopy (FTIR),and shows that the deposition of the Zn 3 Al-CO 3 was carried on the Ghassoul support successfully. The chemical resistance and pure water permeability tests suggest the use of the Zn 3 Al-Gh membrane for the microfiltration applications. In this context, the performance of Zn 3 Al-Gh membrane has been used in attempt to remove the indicator bacteria of fecal pollution, and eventually pathogenic bacteria in company with them, which are existing in groundwater of the urban commune "Sebaa-Ayoune" (Fez-Meknes region, Morocco). The analysis of the samples of water after and before microfiltration showed the bacteria removal is important for all germs indicating of fecal pollution. On the other hand, the diminution of the turbidity, the conductivity and the concentration of Ca 2+ , SO 4 2-, NO 3 and NH 4 + were established.

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“…For the case of water and wastewater treatments, these types of separation and purification seem more under attention due to serious concerns about water shortage and methods of resolving within the past and future. Moreover, water purification with ultrafiltration (UF) membranes and their modification has been always a hot topic in the membrane science applications …”

Section: Introductionmentioning

confidence: 99%

Preparation of poly(vinyl chloride) (PVC) ultrafiltration membranes from PVC/additive/solvent and application of UF membranes as substrate for fabrication of reverse osmosis membranes

Dizajikan

Asadollahi

Musavi

et al. 2018

J of Applied Polymer Sci

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Ultrafiltration (UF) membranes were prepared from poly(vinyl chloride) (PVC) as main polymer, poly(vinyl pyrrolidone) (PVP) as additive, and 1‐methyl‐2‐pyrrolidone (NMP) as solvent using Design Expert software for designing the experiments. The membranes were characterized by SEM, contact angle measurement, and atomic force microscopy. The performance of UF membranes was evaluated by pure water flux (PWF) and blue indigo dye particle rejection. In addition, the molecular weight cutoff of UF membranes was determined by poly(ethylene glycol) (PEG) rejection. The UF membranes were used as substrates for fabrication of polyamide thin film composite (TFC) reverse osmosis (RO) membranes. The results showed that the model had high reliability for prediction of PWF of UF membranes. Also, increment in PVC concentration caused reduction of PWF. Moreover, at constant PVC concentration and if the concentrations of PVC was lower than 10 wt %, the PWF reduced by increasing the concentration of PVP. However, at PVC concentration higher than 11 wt %, increment in PVP concentration showed increment and reduction of PWF. The PEG rejection results showed that the prepared membranes had UF membranes properties. Finally, the NaCl rejection tests of RO membranes by PVC as substrates indicated that the performance of RO membranes were lower than commercial membranes. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46267.

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Hydraulic backwashing for low-pressure membranes in drinking water treatment: A review

Cited by 163 publications

References 152 publications

Optimization of Air Backwash Frequency during the Ultrafiltration of Seawater

Optimization of Air Backwash Frequency during the Ultrafiltration of Seawater

Performance Study Of The Membrane Based Layered Double Hydroxides ‘ZnAl-Gh’ In The Purification Of Groundwater

Preparation of poly(vinyl chloride) (PVC) ultrafiltration membranes from PVC/additive/solvent and application of UF membranes as substrate for fabrication of reverse osmosis membranes

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