Understanding the oxidative cleaning of UF membranes

Levitsky, Inna; Duek, Aviv; Arkhangelsky, Elizabeth; Pinchev, Diana; Kadoshian, Tali; Shetrit, Hila; Naim, R.; Gitis, Vitaly

doi:10.1016/j.memsci.2011.04.046

Cited by 83 publications

(44 citation statements)

References 37 publications

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“…Therefore, the contact angle could be determined to be inversely proportional to the content of hydrophilic additives in membrane. It is also worth mentioning that the current findings in this work is a contradiction to the earlier study in which the membrane becomes more hydrophilic subsequent to chemical cleaning (Levitsky et al, 2011). The variation in cleaning procedure where the aforementioned work cleaned the membrane by soaking with a relatively higher cleaning dosage (concentration Â cleaning period) could have led to the different results.…”

Section: Contact Angle Measurementcontrasting

confidence: 96%

“…It was previously alleged that chemical cleaning improves the degree of PVDF membrane hydrophilicity (Hajibabania et al, 2012;Levitsky et al, 2011), thus, giving higher water flux. Conversely, the contrary outcome was observed in our work as membranes became less hydrophilic (based on contact angle values) after cleaning.…”

Section: Resultsmentioning

confidence: 99%

“…It was observed that the increase in contact angle value resulted in a lower protein retention. Earlier study suggested that the separation of protein is governed by membrane hydrophilicity (Levitsky et al, 2011) in which, the higher the hydrophilicity, the better the retention and vice versa. In our work, the rejection performance is presumed to be inversely proportional to the contact angle value.…”

Section: Protein Retentionmentioning

confidence: 99%

“…There have been many studies conducted with regards of fouling, yet, only a small number of research were committed to study PVDF membrane ageing that are caused by chemical cleaning (Hajibabania et al, 2012;Levitsky et al, 2011;Puspitasari et al, 2010). Sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl) are both commonly used in the membrane cleaning study (Kimura et al, 2004;Lin et al, 2010;Regula et al, 2013;Suárez et al, 2012;Wang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Subsequent to cleaning, distinct membrane pores can be observed given that the alkaline solution successfully removes the organic contaminants of protein, together with the microorganisms that lie inside and on the surface of the membrane. Levitsky et al evaluated the effects of cleaning a bovine serum albumin (BSA) fouled PVDF membrane using NaOCl (Levitsky et al, 2011). In general, all cleaned membranes presented a higher permeability than the virgin membranes which implies an enhanced hydrophilicity of the membrane.…”

Section: Introductionmentioning

confidence: 99%

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Impact of in situ physical and chemical cleaning on PVDF membrane properties and performances

Rabuni

Sulaiman

Aroua

et al. 2015

Chemical Engineering Science

117

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The effect of cleaning process at mild conditions towards PVDF membrane stability is investigated. Two commonly used cleaning agents (NaOH and NaOCl) were found to reduce PVDF membrane stability. The protein retention performance of membrane is reduced subsequent to membrane cleaning process. The stability of PVDF membrane was affected even at a chemical concentration of 0.01 M. a b s t r a c tAppropriate selection of cleaning agent is an important factor to achieve a better cleaning efficiency and this topic has become an ongoing discussion. This work assesses the impacts of sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl) aqueous solution towards polyvinylidene fluoride (PVDF) stability at the typical concentrations used in membrane cleaning. The cleaned membranes were characterised using field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR), pure water flux measurement, contact angle, protein retention and tensile testing. Membrane cleaned at elevated temperature and higher concentration presented a higher water flux than the virgin membrane which can be a worrying sign of alteration in membrane properties. The FTIR spectra indicated that the alteration in chemical composition of the membrane causes a reduction in the degree of hydrophilicity. The mechanical properties of the membrane were compromised based on the declination of tensile strength. The findings from this work suggest that the usage of NaOCl as compared to NaOH causes a more detrimental effect towards the stability of the PVDF membrane.

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Section: Contact Angle Measurementcontrasting

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Protein Retentionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Impact of in situ physical and chemical cleaning on PVDF membrane properties and performances

Rabuni

Sulaiman

Aroua

et al. 2015

Chemical Engineering Science

117

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Membrane Integrity Monitoring

Gitis

Rothenberg

2013

Encyclopedia of Membrane Science and Technology

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This article overviews the principles, advantages, and disadvantages of membrane integrity tests with emphasis on their sensitivity, reliability, and feasibility for various types of membranes. The 10 integrity tests presented are grouped into four categories: pressure‐based, marker‐based, visualization, and acoustic sensing. The methods detailed here include pressure and vacuum decay tests (PDT/VDT), diffuse air flow (DAF), bubble point, TOC profiling, and sonic sensing currently used in industry.

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The Basics

2016

Ceramic Membranes: New Opportunities and Practical Applications

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Understanding the oxidative cleaning of UF membranes

Cited by 83 publications

References 37 publications

Impact of in situ physical and chemical cleaning on PVDF membrane properties and performances

Impact of in situ physical and chemical cleaning on PVDF membrane properties and performances

Membrane Integrity Monitoring

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