Wastewater treatment by membrane distillation

Gryta, Marek; Tomaszewska, Maria; Karakulski, Krzysztof

doi:10.1016/j.desal.2006.09.010

Cited by 172 publications

(89 citation statements)

References 11 publications

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“…In other cases, wetting across the whole membrane thickness was reported, which has been seen in PTFE and PVDF membranes, evidenced by the presence of salt crystals at various depths of the membrane's cross section [24,102]. Pore wetting may degrade the performance of the MD process either because it reduces the interface for evaporation and therefore the production of vapor, or because, once a pore is wetted, saline water may flow through and contaminate the distillate [24,59,57,102,112,113].…”

Section: Wetting and Permeate Water Quality Changementioning

confidence: 99%

“…Severe protein fouling was observed at temperatures higher than 20-38°C for aqueous solutions containing organic compounds at representative concentrations (i.e., wastewater, NOM, bovine serum albumin, etc.) [30,84,102] but it was practically absent at lower temperatures [103]. Notably, hydrophobic surfaces show an especially high tendency to get fouled by proteins [104], making MD membranes problematic for waters containing proteins, amino sugars or polysaccharides [105].…”

Section: Temperaturementioning

confidence: 99%

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Scaling and fouling in membrane distillation for desalination applications: A review

et al. 2015

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Section: Wetting and Permeate Water Quality Changementioning

confidence: 99%

Section: Temperaturementioning

confidence: 99%

Scaling and fouling in membrane distillation for desalination applications: A review

et al. 2015

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“…The treatment with HCl acid to reduce the pH value and limit the precipitation of carbonates was not necessary [35]. 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 ).…”

Section: Inorganic Foulingmentioning

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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“…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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Wastewater treatment by membrane distillation

Cited by 172 publications

References 11 publications

Scaling and fouling in membrane distillation for desalination applications: A review

Scaling and fouling in membrane distillation for desalination applications: A review

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

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

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