Fouling analysis and control in a DCMD process for SWRO brine

Nguyen, Quynh-Mai; Lee, Seockheon

doi:10.1016/j.desal.2015.03.039

Cited by 50 publications

(16 citation statements)

References 26 publications

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“…Analysis of fouling process and identification of foulants by means of characterization techniques are important to determine suitable treatment methods for fouling control. It is worth noting that very few studies have been published so far on fouling mechanisms in MD, OD and OMD and investigations on the kinetics behind fouling phenomena and fouling mitigation remain very scarce [12,13]. Two review papers have been published on fouling and scaling in MD but not on OD and OMD [14,15].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

et al. 2017

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“…This means that the rate of forward reaction with a formation of ammonium ion is almost 3.2 × 10 4 times faster than that occurring toward the formation of ammonia gas [45]. Consequently, the ammonia gas passed through the membrane can be ionized into ammonium ion quickly, thereby increasing the permeate pH [43,46]. Figure 4 shows rejection efficiencies of organics and phosphorus at the same operational conditions applied in Figure 3.…”

Section: Of 12mentioning

confidence: 97%

“…Ammonia transfer is driven by the difference in partial pressure of ammonia gas between feed wastewater and permeate. An explanation is that higher feed temperature can allow more ionization of the bicarbonate ions (HCO 3 − ) into carbonate ions (CO 3 2− ), leading to increase a feed wastewater pH [43]. In addition, an increase in temperature of feed wastewater should facilitate the volatilization of ammonium ion (NH 4 + ) into ammonia gas which can be passed through the hydrophobic membrane easily.…”

Section: Variations Of Solution Ph With Operational Conditionsmentioning

confidence: 99%

Permeate Flux and Rejection Behavior in Submerged Direct Contact Membrane Distillation Process Treating a Low-Strength Synthetic Wastewater

Bae

Kim

2020

Applied Sciences

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The effects of operational conditions such as permeate recirculation velocity, mixing intensity, and trans-membrane temperature on the performances of hydrophobic polyethylene (PE) hollow-fiber membrane were investigated by operating the submerged direct contact membrane distillation (SDCMD) process treating a synthetic low-strength wastewater. Permeate flux of the membrane increased with increasing a permeate recirculation velocity through the fiber lumen. However, the effectiveness was less pronounced as the velocity was higher than 0.5 m/s. Increasing rotational speed to 600 rpm, which can lead to mixing intensity from a bulk wastewater toward hollow-fiber membrane, enhanced permeate flux. Feed temperature played a more significant role in enhancing permeate flux rather than a permeate temperature under constant trans-membrane temperature. The SDCMD process treating a synthetic low-strength wastewater achieved an excellent rejection efficiency which is higher than 97.8% for both chemical oxygen demand (CODCr) and total phosphorus (T-P) due to the hydrophobic property of membrane material which can allow water vapor through membrane. However, the rejection efficiency of the ammonia nitrogen (NH3-N) was relatively low at about 87.5% because ammonia gas could be volatized easily through membrane pores in SDCMD operation. In a long-term operation of the SDCMD process, the permeate flux decreased significantly due to progressive formation of inorganic scaling on membrane.

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“…The deposit formed inside the membrane pores can be removed e.g. by using a HCl solution, however, this rinsing additionally enhances the degree of wettability and as a result, the advantages resulting from the application of high feed temperature will be rapidly lost 21, 29, 35 . Therefore, the internal scaling is more dangerous for the membrane performance, especially if the production of demineralised water is considered.…”

Section: Membrane Scalingmentioning

confidence: 99%

“…The obtained results indicate that the formation of substantially larger amounts of deposits in the module MK4 in a comparison to the modules MK3 (less deposit) also signifi cantly increased a depth of membrane walls wettability. In the work 35 scaling caused a rapid membrane wetting and the distillate conductivity increased to 250 μS/cm after 8 h of MD process duration due to a low membrane thickness (36 μm PTFE active layer/53 μm PP support layer). However, the values of wetting depth (10-30 μm) determined in our studies are small in a comparison with the total thickness of the walls of used membranes (400 μm).…”

Section: Membrane Scalingmentioning

confidence: 99%

Water Demineralization by Membrane Distillation Utilizing Cooling Water From Municipal Waste Incinerator

Gryta

2018

Polish Journal of Chemical Technology

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The membrane distillation performance was studied for production of demineralized water from surface water (river). Hot water from cooling water system of municipal waste incinerator was considered as an energy source for membrane distillation. The integration of membrane installation with such cooling water system allows to re-use up to 18 kW per 1 m2 of the membranes. The studies were performed with the application of polypropylene capillary membranes Accurel PP S6/2. The membrane modules were supplied with the feed heated to a temperature of 310 K and 330 K. The permeate fl ux obtained for these temperatures was 2.8 and 9.7 L/m2 h, and the distillate conductivity was 6 and 4 S/cm, respectively. The water demineralisation process was carried out for 1200 h without module cleaning. The behaviour of the permeate fl ux and distillate conductivity indicate that used membranes maintained their non-wettability over tested period. The performed SEM-EDS examinations confi rmed, that the deposits did not fi ll the pores and were mainly formed on the membrane surface. The scaling intensity was defi nitely smaller for lower temperature (310 K) of the feed. The amorphous deposits containing beside Ca also substantial amounts of the Si were mainly formed under these conditions, whereas at higher feed temperature dominated CaCO3 scaling.

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Fouling analysis and control in a DCMD process for SWRO brine

Cited by 50 publications

References 26 publications

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

Permeate Flux and Rejection Behavior in Submerged Direct Contact Membrane Distillation Process Treating a Low-Strength Synthetic Wastewater

Water Demineralization by Membrane Distillation Utilizing Cooling Water From Municipal Waste Incinerator

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