Long-term performance of membrane distillation process

Gryta, Marek

doi:10.1016/j.memsci.2005.04.049

Cited by 246 publications

(140 citation statements)

References 15 publications

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“…However, Gryta, et al [68] observed a high decline of the permeate flux due to the blockage of the membrane pores when wastewater was concentrated in salts up to 48.9 g/L (mainly NaCl in presence of other salts like Mg, K and Ca) [68]. The effect of the salts crystallization on pore wetting was detected by Gryta [33,69] who found a significant wetting of pores in the presence of CaCO 3 crystals when treating water containing organic matter (TDS = 409-430 mg·L −1 , TOC = 6.8-8.5 mg·L −1 ). This phenomenon led to a decrease of the permeate flux and an increase of the salts concentration of the permeate.…”

Section: Inorganic Foulingmentioning

confidence: 98%

“…Biofouling or biological fouling refers to the growth of bacteria or micro-organisms on the membrane surface (see Figure 3) and biological particles or colloidal species that may be trapped at both the membrane surface and/or pores forming a biofilm [69]. This type of fouling has been less studied in MD compared to other membrane processes such as MF.…”

Section: Biofoulingmentioning

confidence: 99%

“…Generally, after rinsing the membrane with distilled water, the used chemical cleaning agents include acids, alkalis, surfactants, enzymes and metal chelating agents (i.e., organic compounds that form complexes with metal ions) [15,17,156]. Research studies used different strong and weak acids to clean scales such as HCl, which is particularly effective to remove basic crystal salts (e.g., CaCO 3 ) by dissolving the deposit from the membrane surface [14,49,69]. According to Gryta [49], rinsing the membrane module by 3 wt % HCl allowed to dissolve the CaCO 3 scale on the PP hollow fiber membrane and restore the initial membrane permeability.…”

Section: Membrane Cleaningmentioning

confidence: 99%

“…According to Gryta [49], rinsing the membrane module by 3 wt % HCl allowed to dissolve the CaCO 3 scale on the PP hollow fiber membrane and restore the initial membrane permeability. In another study, Gryta [69] used 2-5 wt % HCl solution to rinse the membrane module every 40-80 h of DCMD operation. As a result, the formed deposit, which was mainly CaCO 3 , was removed and the initial efficiency of the membrane module was recovered.…”

Section: Membrane Cleaningmentioning

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: 98%

Section: Biofoulingmentioning

confidence: 99%

Section: Membrane Cleaningmentioning

confidence: 99%

Section: Membrane Cleaningmentioning

confidence: 99%

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Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

et al. 2017

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“…In comparison with other separation operations, MD has obvious advantages: almost a complete rejection of dissolved and non-volatile species, lower operating pressure than pressuredriven membrane processes, reduced vapour space compared to traditional distillation, low operating temperature of a feed enables the utilization of waste heat as a preferable energy source [12][13][14][15][16][17][18]. Although the MD technology has the advantages that other membrane technologies have not, one of main obstacles impeding the implementation of MD is membrane fouling, which is caused by interactions between the membrane and the various components during the process [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of coagulation pretreatment on membrane distillation process for desalination of recirculating cooling water

Wang

Tie³

et al. 2008

Separation and Purification Technology

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a b s t r a c tThe objective of this work was to study the performance of coagulation pretreatment and the effect of coagulation pretreatment on membrane distillation (MD) process for desalination of recirculating cooling water (RCW). In this study, RCW was desalinated by MD process after pretreated by coagulation, precision filtration, acidification and degassing. Pre-coagulation of RCW with poly-aluminum chloride (PACl) coagulant improves the elimination of total organic carbon (TOC), total phosphorus (TP) substances. The optimized pH value and PACl dosage were 7 and 15 mg/L, respectively. Compared with MD process without coagulation pretreatment, much slighter MD flux decrease was observed when coagulation pretreatment was employed for desalination of RCW using MD process. Compared with the membrane flux of MD process for the RCW without coagulation pretreatment, about 23% improvement of MD flux was obtained by employing coagulation pretreatment after 30 days operation. The variation of crystal morphology on membrane surface and hydrophobic character of PVDF hollow membranes were investigated. The results show that distorted rhombic magnesium-calcite scale formed on membrane surface when coagulation pretreatment was employed. However, the deposited magnesium-calcite on the membrane surface was loosely packed with particles of much smaller size when RCW without coagulation pretreatment was fed. It is because that the coagulation pretreatment removed most of the natural organic matter (NOM) and antiscalant additives in RCW, which act as an inhibitor to calcium carbonate crystal growth in water. After coagulation pretreatment, bigger crystal deposit formed on membrane surface with the increase in CF of RCW. It was rather difficult for bigger crystal to enter membrane pores and thus the formation of bigger crystal reduced partial wetting of membrane, which enhanced trans-membrane flux. The hydrophobic character of PVDF hollow membranes used in MD process can be easily recovered by chemical rinsing using acid-base solutions. The results indicate that the pretreatment with chemical coagulant, PACl, is effective for the desalination of RCW by MD process.Crown

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Membrane Distillation

Khayet

2008

Advanced Membrane Technology and Applications

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Long-term performance of membrane distillation process

Cited by 246 publications

References 15 publications

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

Effect of coagulation pretreatment on membrane distillation process for desalination of recirculating cooling water

Membrane Distillation

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