Potential for scaling by sparingly soluble salts in crossflow DCMD

He, Fei; Gilron, Jack; Lee, Hanyong; Song, Liming; Sirkar, Kamalesh K.

doi:10.1016/j.memsci.2007.11.056

Cited by 146 publications

(103 citation statements)

References 24 publications

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“…He, et al [34] did not observe any decrease of the permeate flux even for very high calcium sulfate and calcium carbonate aqueous solutions [35]. In the most unfavorable case, the decrease of the permeate flux was only 11% after 6 h of DCMD operation of a feed solution containing both calcium sulfate and calcium carbonate with the saturation index (SI) 1.21 and 49 at 75 • C, respectively.…”

Section: Inorganic Foulingmentioning

confidence: 95%

“…fouling in MD is still relatively less studied and poorly understood [33][34][35]. In MD, fouling can be divided into three types: organic fouling, inorganic fouling and biological fouling.…”

Section: Fouling In MDmentioning

confidence: 99%

“…When salts are precipitated, these can be removed by a simple circulation of water tangentially to the membrane [34]. He, et al [35] cleaned the membranes by washing first with HCl (e.g., elimination of CaCO 3 by reducing the pH) then with pure water (e.g., elimination of salts by dissolution) followed by membrane drying.…”

Section: Inorganic Foulingmentioning

confidence: 99%

“…He, et al [34], who coated PP hollow fiber membranes with a porous fluorosilicone for their use in DCMD process, claimed that the fluorosilicone coating could discourage surface nucleation and particles attachment. In another study [35], mentioned that the porous fluorosilicone coating layer on the PP hollow fiber membranes was helpful to eliminate and develop the necessary resistance against the deposit scale such as CaSO 4 and CaCO 3 in DCMD experiments.…”

Section: Membrane Modificationmentioning

confidence: 99%

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Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

et al. 2017

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Various membrane separation processes are being used for seawater desalination and treatment of wastewaters in order to deal with the worldwide water shortage problem. Different types of membranes of distinct morphologies, structures and physico-chemical characteristics are employed. Among the considered membrane technologies, membrane distillation (MD), osmotic distillation (OD) and osmotic membrane distillation (OMD) use porous and hydrophobic membranes for production of distilled water and/or concentration of wastewaters for recovery and recycling of valuable compounds. However, the efficiency of these technologies is hampered by fouling phenomena. This refers to the accumulation of organic/inorganic deposits including biological matter on the membrane surface and/or in the membrane pores. Fouling in MD, OD and OMD differs from that observed in electric and pressure-driven membrane processes such electrodialysis (ED), membrane capacitive deionization (MCD), reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF), microfiltration (MF), etc. Other than pore blockage, fouling in MD, OD and OMD increases the risk of membrane pores wetting and reduces therefore the quantity and quality of the produced water or the concentration efficiency of the process. This review deals with the observed fouling phenomena in MD, OD and OMD. It highlights different detected fouling types (organic fouling, inorganic fouling and biofouling), fouling characterization techniques as well as various methods of fouling reduction including pretreatment, membrane modification, membrane cleaning and antiscalants application.

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Section: Inorganic Foulingmentioning

confidence: 95%

Section: Fouling In MDmentioning

confidence: 99%

Section: Inorganic Foulingmentioning

confidence: 99%

Section: Membrane Modificationmentioning

confidence: 99%

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Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

et al. 2017

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“…In recent years, a number of studies have investigated the effect of membrane scaling on the overall MD process utilizing different types of membranes such as flat-sheet and hollow fibers, as well as using different modules [4]. However, the majority of studies focused on the negative effects and mitigation strategies of inorganic membrane scaling such as calcium carbonate or calcium sulfate [16][17][18]. As far as we know, there are limited studies dedicated to silica scaling in the MD process.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic irradiation control of silica fouling during membrane distillation process

et al. 2016

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• Ultrasonic irradiation was introduced into membrane distillation process.• Influence of ultrasonic irradiation on silica fouling control was investigated.• Calcium ion would destroy silica colloid stability and aggravate membrane fouling.• Ultrasonic irradiation can mitigate silica fouling and maintain permeate flux. a b s t r a c t a r t i c l e i n f o Ultrasonic irradiation was introduced into membrane distillation process and the influence of ultrasonic irradiation on silica fouling control was investigated. A gradual decline of permeate flux during the concentration process of silica solution was observed due to the formation and deposition of colloidal polysilicic acid on the membrane surface. The PTFE hollow fiber membrane could maintain its mechanical properties and initial pore size distribution in the presence of ultrasonic irradiation. Ultrasonic wave brought significant mechanical and thermal effects, and generated powerful shock wave and microstreaming with high speed. The microstreaming, shock wave and acoustic vortex streaming stimulated the liquid-membrane interface continuously, therefore the membrane surface could be effectively kept clean and the permeate flux was hardly affected by the increasing of concentration factor. Due to the charge neutralization and compression of double charged layer induced by calcium ions, the silica colloid stability was eliminated and the colloids aggregated. A large amount of silica scaling was deposited on the membrane surface even at the beginning of concentration process. With ultrasonic irradiation, the permeate flux maintained stable and was enhanced by about 43%; the ultrasonic irradiation could effectively control silica fouling during membrane distillation.

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Scaling

Gilron

2013

Encyclopedia of Membrane Science and Technology

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Scaling is one of the most vexing problems affecting the use of membranes for pressure‐driven desalination. The scaling problems most commonly encountered are caused by calcium carbonate, calcium sulfate, and silica in brackish water RO; calcium carbonate and calcium sulfate in seawater RO; and calcium carbonate and calcium phosphate in desalination of municipal wastewater. This article surveys the conditions leading to scaling, mechanisms by which scaling can cause flux decline, thermodynamics and kinetics of scaling, present state of the art in preventing scaling, new processes proposed for mitigating the problem, and new techniques for detecting the onset of scaling.

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Potential for scaling by sparingly soluble salts in crossflow DCMD

Cited by 146 publications

References 24 publications

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

Ultrasonic irradiation control of silica fouling during membrane distillation process

Scaling

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