Membrane fouling and chemical cleaning in water recycling applications

Beyer, Monique; Lohrengel, Burkhard; Nghiem, Long D.

doi:10.1016/j.desal.2009.09.085

Cited by 53 publications

(15 citation statements)

References 10 publications

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“…The later stage of fouling development, which is governed by foulant-foulant interactions, caused less effect on permeate flux decline. In particular, the presence of Ca 2+ in the feed solution could cause severe impact on the flux decline because Ca 2+ could bridge carboxylate functional groups on neighbouring alginate molecules and so make the fouling layer thicker and denser [10,12,[39][40]. This finding is verified by the high level of calcium found in the fouling layer (Figure 3c).…”

Section: Membrane Fouling Behaviourmentioning

confidence: 76%

Effects of membrane fouling and scaling on boron rejection by nanofiltration and reverse osmosis membranes

2011

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The effects of membrane fouling on the performance of nanofiltration and reverse osmosis membranes with respect to boron rejection and permeate flux were investigated in this study. A nanofiltration (NF270) membrane and a reverse osmosis (BW30) membrane were used in this investigation. Four typical membrane fouling conditions were simulated under controlled laboratory conditions in a cross-flow membrane system using four model foulants including humic acid, sodium alginate, colloidal silica and CaSO 4. Among these model foulants, humic acid was found to increase boron rejection whereas the other foulants led to a decrease in boron rejection. Properties of foulants were found to be an important factor that determined the transport of boron through the fouling layer. Results reported in this study also indicate that the extent of flux decline caused by different model foulants differed substantially from one another. The impact of membrane fouling on permeate flux decline was found to be dependent on the initial permeate flux and hydrophobicity of the foulant. On the other hand, membrane scaling was found to be governed by the salt rejection efficiency of the membrane. Cake-enhanced concentration polarisation appears to be a major mechanism that affects boron rejection efficiency of fouled membranes.

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Section: Membrane Fouling Behaviourmentioning

confidence: 76%

Effects of membrane fouling and scaling on boron rejection by nanofiltration and reverse osmosis membranes

2011

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“…Moreover, OM is described as the major foulant type in water treatment [13]. Indeed, the organic matter found in secondary treated effluent typically consists of three major fractions namely refractory natural organic matter (NOM), proteins, and polysaccharide resulted from the metabolism process of microorganisms during biological wastewater treatment [27]. OM blocks membrane pores binding particles together to generate a low permeability particle cake layer on the membrane surface [28].…”

Section: Introductionmentioning

confidence: 99%

Sonochemical control of fouling formation in membrane ultrafiltration of wastewater: Effect of ultrasonic frequency

Naddeo

Borea

Belgıorno

2015

Journal of Water Process Engineering

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“…The effective removal of biopolymers can be attributed to the enhanced cleavage of polysaccharides and proteins into sugars and amides by hydrolysis after oxidation of these substances with hypochlorite [42]. In contrast, strong complexation between humic substances and calcium ions could limit flux recovery [43,44]. These results indicate that the cleaning protocol used in this study may not be sufficient for the treated wastewater with abundant humiclike substances.…”

Section: Model Foulant Solutionsmentioning

confidence: 89%

Membrane fouling, chemical cleaning and separation performance assessment of a chlorine-resistant nanofiltration membrane for water recycling applications

Tin

Anioke

Nakagoe

et al. 2017

Separation and Purification Technology

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The effectiveness of hypochlorite cleaning for fouling mitigation of a prototype chlorineresistant nanofiltration (NF) membrane was assessed for direct filtration of a secondary treated effluent. The chlorine resistance and separation performance of the prototype NF membrane were also compared to commercial NF and reverse osmosis membranes. The prototype chlorine resistant NF membrane did not show any changes in permeability and conductivity rejection after exposing a NaOCl solution for up to 5×10 4 ppm-h. By contrast, a considerable deterioration in rejection was observed for the other two commercial membranes. Direct filtration of a secondary treated effluent by the prototype NF membrane resulted in a progressive permeability reduction by up to 25% after 10 h of filtration. The membrane permeability was fully restored by hypochlorite cleaning with a 2,000 ppm NaOCl solution for 1 h. Effective permeability recovery by hypochlorite cleaning was demonstrated with multiple hypochlorite cleaning cycles. Membrane fouling and hypochlorite cleaning were also simulated using solutions containing a model foulant (sodium alginate, humic acids or bovine serum albumin). Among them, an insufficient permeability recovery was observed for membrane fouling caused by humic acids. Further research is recommended to develop an improved hypochlorite cleaning protocol to control various membrane fouling.

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Membrane fouling and chemical cleaning in water recycling applications

Cited by 53 publications

References 10 publications

Effects of membrane fouling and scaling on boron rejection by nanofiltration and reverse osmosis membranes

Effects of membrane fouling and scaling on boron rejection by nanofiltration and reverse osmosis membranes

Sonochemical control of fouling formation in membrane ultrafiltration of wastewater: Effect of ultrasonic frequency

Membrane fouling, chemical cleaning and separation performance assessment of a chlorine-resistant nanofiltration membrane for water recycling applications

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