Impact of pretreatment conditions and chemical ageing on ultrafiltration membrane performances. Diagnostic of a coagulation/adsorption/filtration process

Touffet, Arnaud; Baron, J.; Welté, B.; Joyeux, Marc; Teychene, Benoît; Gallard, Hervé

doi:10.1016/j.memsci.2015.04.043

Cited by 40 publications

(12 citation statements)

References 64 publications

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“…Although there is some controversy concerning the assignment of this peak, it can be ascribed to the formation of sulfonic acid group due to PES chain scission based on the variation of membrane surface charge, which will be discussed in Section 3.3. Compared with NaClO aging at pH 11, NaClO aging at pH 9 resulted in more dramatic changes in peak intensities at 1772, 1700, 1668, and 1032 cm −1 , suggesting a much higher extent of PVP degradation and PES chain scission at pH 9 than that at pH 11. pH-dependent of PES/PVP degradation by NaClO has been reported in several studies, and it was usually attributed to the formation of hydroxyl radical in NaClO solution due to the coexistence of ClO − and HClO under neutral to weak alkaline conditions [14,38,39]. In contrast, neither decrease of the peak intensity at 1668 cm −1 nor appearance of new peaks at 1772, 1700, and 1032 cm −1 was observed for control and H 2 O 2 -aged membranes, indicating that PVP oxidation/dislodgement and PES chain scission was insignificant under the aging conditions here.…”

Section: Resultsmentioning

confidence: 99%

Effects of Hydrogen Peroxide and Sodium Hypochlorite Aging on Properties and Performance of Polyethersulfone Ultrafiltration Membrane

Shu

et al. 2019

IJERPH

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Chemical reaction of main polymer and additive with oxidative cleaning agents plays an important role in aging of polymeric membrane for water and wastewater treatment. As a green and powerful oxidant, hydrogen peroxide (H2O2) can achieve good cleaning efficacy under alkaline condition, but its influence on membrane aging was poorly understood. In this study, degradation of polyethersulfone (PES) membrane due to H2O2 exposure under alkaline condition (pH 9 and 11) was holistically investigated by humic acid (HA) filtration experiments and multiple membrane characterization techniques, with sodium hypochlorite (NaClO) aging examined as a comparison. Membrane permeability and HA retention rate was hardly changed by H2O2 aging at an exposure dose of 500 g·h/L, whereas NaClO aging led to substantial increase of membrane permeability and significant decrease of retention ability. Meanwhile, H2O2 aging slightly increased fouling propensity with HA filtration, while NaClO aging resulted in more serious fouling. ATR-FTIR and XPS analysis revealed much less degradation of PES and hydrophilic additive by H2O2 than that by NaClO, and membrane morphology and surface properties were characterized to explain the variation of filtration performance. Overall, compared with cleaning with NaClO, membrane degradation can be minimized by cleaning with H2O2.

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Section: Resultsmentioning

confidence: 99%

Effects of Hydrogen Peroxide and Sodium Hypochlorite Aging on Properties and Performance of Polyethersulfone Ultrafiltration Membrane

Shu

et al. 2019

IJERPH

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“…Various commonly used flocculants and flocculant aids exist in the industrial sector [14], such as trivalent 4 aluminium salts and iron salts. From a traditional point of view of wastewater treatment, flocculation is fairly effective as a pre-treatment for membrane technology, because it removes not only suspended solids, but also N, P, and organic matter from the water [15]. However, the results from these studies cannot be transferred directly to digested slurry, due to its specific physicochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of flocculation pre-treatment on membrane nutrient recovery of digested chicken slurry: Mitigating suspended solids and retaining nutrients

Luo

Lyu

Muhmood

et al. 2018

Chemical Engineering Journal

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Use of membrane filtration is attracting increasing attention for nutrient recovery from anaerobically digested slurry. However, the challenge is to reduce membrane fouling by effective solids mitigation, while maintaining valuable nutrients. In this study, the effects of several flocculation pre-treatments using polyaluminium chloride, iron chloride, and flocculant aid at various dosages were investigated. The results showed significant improvement in membrane flux from 0.8 to 27.6 mL/m 2 /s due to solid 2 migration (up to 75% removal). Significant loss of PO4 3− -P (99%) and humic acids (40-80 %) was observed. However, the content of NH4 + -N and indoleacetic acids was largely maintained in the treated slurry. Moreover, toxic metals were significantly removed through flocculation, making the final product risk-free of heavy metals for agricultural application.

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“…In fact, aged membranes have been autopsied and almost no residual PVP was detected (results not shown) by attenuated total reflectance/Fourier transformed infrared spectroscopy after washing the membrane. The decrease in absorbance at 1,650 cm indicates PVP degradation on the fiber (Touffet et al 2015).…”

Section: Resultsmentioning

confidence: 99%

Clarification: Impact on Ultrafiltration Membrane Fouling in Drinking Water Treatment

et al. 2015

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The impact of different pretreatment conditions (powdered activated carbon [PAC] addition, iron chloride coagulation, and anionic polymer addition) on ultrafiltration membrane fouling was studied. Experiments were carried out at laboratory scale with new membranes and at pilot scale with used membranes. Results show that PAC has a positive effect—or at least, no negative effect—as long as backwashing allows effective removal of the filtration cake. On the other hand, excess PAC can generate irreversible fouling. Iron chloride has no negative impact for either native or used fibers as long as acid backwashes are effective. Inversely, an anionic polymer has a negative impact in every case—causing irreversible membrane fouling—despite its effectiveness in the clarification process. Test results also confirm that aged membranes are more sensitive to fouling than are pristine membranes. Their more hydrophobic structure is caused by the consumption of the hydrophilic agent under the effect of repeated contact with chlorinated water.

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Impact of pretreatment conditions and chemical ageing on ultrafiltration membrane performances. Diagnostic of a coagulation/adsorption/filtration process

Cited by 40 publications

References 64 publications

Effects of Hydrogen Peroxide and Sodium Hypochlorite Aging on Properties and Performance of Polyethersulfone Ultrafiltration Membrane

Effects of Hydrogen Peroxide and Sodium Hypochlorite Aging on Properties and Performance of Polyethersulfone Ultrafiltration Membrane

Effect of flocculation pre-treatment on membrane nutrient recovery of digested chicken slurry: Mitigating suspended solids and retaining nutrients

Clarification: Impact on Ultrafiltration Membrane Fouling in Drinking Water Treatment

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