Effect of microbubbles on microfiltration pretreatment for seawater reverse osmosis membrane

Gwenaelle, Manvoudou Pissibanganga Ordelia; Jung, Jungwoo; Choi, Yongjun; Lee, Sang-Ho

doi:10.1016/j.desal.2016.06.012

Cited by 31 publications

(14 citation statements)

References 38 publications

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“…The values remain constant for about ~2hr showing the membrane filtration efficiency has dropped due to its ability to filter more particles is now limited. This finding is in agreement to the study conducted by (Gwenaelle et al, 2017) which stated that fouling could be initiated just after 15minutes of filtration. When the microbubbles were introduced to the system after the 700 th minute, the absorbance value varies from 0.019ms -1 to 0.0225ms -1 .…”

Section: Uv/vis and Semsupporting

confidence: 93%

“…Nevertheless, not all of the impurities were removed. The result obtained is similar to the ones conducted by Gwenaelle et al, (2017) where not 100% impurities will be removed by MBs. It has also been suggested that combining MBs with other chemicals such as coagulant may help in improving the rate of impurities eliminated by MBs.…”

Section: Colloids Deposition and Its Removal -Scanning Electron Microsupporting

confidence: 86%

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Membrane defouling using microbubbles generated by fluidic oscillation

Harun

Zimmerman

2018

Water Supply

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Impurities and colloidal substances are two of many fouling conditions that reduce the membrane filtration performance used in wastewater treatment. This study investigates the potential of fluidic-oscillation-generated microbubbles (MBs) to defoul the filtration membrane. Cartridge filters for microfiltration (MF) of 1 μm pore size were fouled using surface seawater collected from the Hull coastal area. The seawater was circulated at 5.8 L/min to actuate colloidal substance deposition on the membrane surface. The recorded feed channel pressure drop (ΔP) across the membrane filters showed rapid fouling occurred in the first 8 hrs of the circulation. Fluctuations of ΔP during the next 8 hrs were observed showing the colloids filling the pores of the membrane, and remaining steady for 2 hrs showing the membrane was completely fouled. The filtration membrane was cleaned and defouled using fluidic-oscillator-generated MBs. The fouled membranes were sparged with 1 L/min of air scouring for ∼1 to ∼2 hrs to remove the deposited colloids and impurities on the surface of the membrane. The membrane, analysed by Scanning Electron Microscopy (SEM), UV254 and Electrical Conductivity (EC) meter, showed the extent of MBs-mediated removal of the deposited colloidal particle from the membrane surfaces. This study found that the highest defouling rate occurs with MBs generated by fluidic oscillator (closed vent), followed by MBs generated by fluidic oscillator (opened vent) and MBs generated without fluidic oscillator at 9.53, 6.22, and 3.41 mbar/min, respectively.

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Section: Uv/vis and Semsupporting

confidence: 93%

Section: Colloids Deposition and Its Removal -Scanning Electron Microsupporting

confidence: 86%

Membrane defouling using microbubbles generated by fluidic oscillation

Harun

Zimmerman

2018

Water Supply

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“…energy consumption and cost), and deterioration of the membranes (i.e. material cost) . Biofouling refers to the settlement and growth of microbiological constituents onto the surface of the membrane which is commonly found in seawater.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional pretreatment techniques such as dual media filtration (DMF) as well as microfiltration (MF) and ultrafiltration (UF) are more commonly used for the pretreatment of seawater . Overall, the pretreated seawater using MF and/or UF has much higher quality than the conventional DMF .…”

Section: Introductionmentioning

confidence: 99%

Surface modification of anti‐fouling novel cellulose/graphene oxide (GO) nanosheets (NS) microfiltration membranes for seawater desalination applications

Ibrahim

Banat

Yousef

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Reverse osmosis (RO) is becoming the predominant technology for the future of desalinated of seawater. Nonetheless, operational challenges such as membrane biofouling in RO desalination plants result in membrane deterioration and high energy costs. In this regard, pre‐treatment technologies, such as microfiltration (MF) membranes, are proven to reduce the impact of membrane biofouling in RO systems. Hence, surface modifications of commercial cellulose MF membranes with graphene oxide nanosheets (GONSs) at different concentrations were carried out in this research study. The new membranes were characterized by scanning electron microscopy (SEM) and Raman spectroscopy amongst other methods of analysis. A continuous cross‐flow MF system was used to investigate the performance of the new cellulose/GONS membranes with regards to total bacteria count (TBC) removal, water flux, and biofouling resistance. RESULTS TBC removal efficiency of 93.6 ± 2.4% and 27.4 ± 12.5% was achieved using the new cellulose/GONS membranes and control pristine cellulose membranes, respectively. This higher removal efficiency was achieved at a water flux of 334.7 ± 10.4 L/(m2 h). Furthermore, a dramatic 55% increase in the transmembrane pressure (TMP) of the pristine cellulose membrane was observed after 24 h operation compared to only a 6% increase in the newly fabricated cellulose/GONS membranes, reflecting their strong anti‐fouling properties. CONCLUSION Surface modification of MF membranes with anti‐fouling nanomaterials such as GONS has the potential to be implemented in the pretreatment of seawater to improve the RO performance and lower the energy consumption. © 2020 Society of Chemical Industry

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“…The major studies in MNB has been performed for treatment of water, especially for treatment of grey and black water and seawater. Researches have shown the application of micro bubbles for desalination of sea water by the process of reverse osmosis (RO) and also for de-fouling of water [6]. They are also been used for ground water remediation process.…”

Section: Introductionmentioning

confidence: 99%

Parameters Influencing Size of Micro Nano Bubble

Sairam*¹,

Gunupuru²,

Mehrotra³

et al. 2019

IJITEE

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Micro Nano Bubble (MNB) have been researched widely for their potental use in different applications such as disinfection, removal of toxic material from water, separation etc. Various parameters such as water temperature, system operating pressure, gas types and gas flow rates contribute in the size of the MNB generated. This research illustrates the influence of various parameters and their significance in size of MNBs generated. Experiments conducted showed that feed gas as a vital parameter for generating bubbles in nano size

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Effect of microbubbles on microfiltration pretreatment for seawater reverse osmosis membrane

Cited by 31 publications

References 38 publications

Membrane defouling using microbubbles generated by fluidic oscillation

Membrane defouling using microbubbles generated by fluidic oscillation

Surface modification of anti‐fouling novel cellulose/graphene oxide (GO) nanosheets (NS) microfiltration membranes for seawater desalination applications

Parameters Influencing Size of Micro Nano Bubble

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