Fouling in direct contact membrane distillation process

Gryta, Marek

doi:10.1016/j.memsci.2008.08.001

Cited by 409 publications

(291 citation statements)

References 59 publications

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“…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%

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: Fouling In MDmentioning

confidence: 99%

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

et al. 2017

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“…The membrane fouling phenomenon is an important limitation of the membrane technology to be generally employed. Fouling is defi ned as existence and growth of microorganisms and a deposition of suspended or dissolved substances on the membrane surface and/or within its pores, which results in a fl ux decline 2, 4 . Several types of fouling can occur in the membrane systems, e.g.…”

Section: -2mentioning

confidence: 99%

“…The organic fouling is mainly associated with adsorption/ deposition of dissolved or colloidal organic material on the membrane surface. This can be adsorption at a molecular level or a gel layer formation of macromolecules on the membrane surface 4 . To overcome this problem, a cleaning process must be carried out.…”

Section: -2mentioning

confidence: 99%

The chemical cleaning of ceramic membrane used in UF

Tomaszewska

Białończyk

2012

Polish Journal of Chemical Technology

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Ultrafi ltration (UF) is one of the membrane processes which is mostly used in the dairy industry for the separation and concentration of whey components or fermentation broth. Fouling of UF membranes in the food industry is primarily due to a deposition of microorganisms, proteins, fats and minerals on the membrane surface. Thus, cleaning of the membranes is an essential step of UF separation. The results from investigations of chemical cleaning of a ceramic UF membrane fouled by precipitation of whey components and yeast contained in the fermentation broth are presented. The effect of cleaning procedure on the degree of permeability restoration by the fouled membrane was studied. The results demonstrated that a combination of sodium hydroxide, phosphoric acid and sodium hypochlorite as a disinfectant could be successfully used to achieve an optimum recovery of the membrane properties.

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“…Membrane scaling in MD process is of particular importance, as scaling can alter membrane surface properties, change membrane pore structure, potentially lead to the wetting of membrane pores and ultimately cause a decline in membrane permeability [11]. Scaling of sparingly soluble salts such as CaCO 3 , CaSO 4 , and silicates has been identified as a cause of flux decline when recovering water from natural streams, including brines from desalination processes [12][13][14][15]. 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].…”

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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Fouling in direct contact membrane distillation process

Cited by 409 publications

References 59 publications

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

The chemical cleaning of ceramic membrane used in UF

Ultrasonic irradiation control of silica fouling during membrane distillation process

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