Soluble microbial products and suspended solids influence in membrane fouling dynamics and interest of punctual relaxation and/or backwashing

Charfi, A.; Yang, Ying; Harmand, Jérôme; Amar, N.; Héran, Marc; Grasmick, A.

doi:10.1016/j.memsci.2014.09.059

Cited by 30 publications

(17 citation statements)

References 28 publications

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“…This confirms that the high BPC concentration contributed to the low porosity and high specific resistance, as recently reported by Poorasgari et al . Consistently, UF showed the typical trend for thin biopolymer ( i.e , gel) layer formation where residual resistance linearly increased until reaching a critical mass deposited, corresponding to a residual fouling resistance of 1.85 × 10 12 m −1 .…”

Section: Resultssupporting

confidence: 89%

Nanofiltration/Reverse Osmosis as Pretreatment Technique for Water Reuse: Ultrafiltration Versus Tertiary Membrane Reactor

Díaz

Cabrera

Vera

et al. 2017

CLEAN Soil Air Water

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The potential for nanofiltration (NF) and reverse osmosis (RO) in secondary effluent reclamation is noteworthy, but both processes require extensive pre‐treatment to prevent membrane fouling and promote system longevity. In this study, performance of direct ultrafiltration (UF) and tertiary membrane bioreactors (tMBRs) as feed pre‐treatments were assessed on a pilot scale. Both technologies achieved high organic matter removal (87 and 93% for UF and tMBR, respectively). Differences in efficiencies were related to suspended biomass in the tMBR, which enhanced degradation of the dissolved organic substances (<5 mg/L) and also stabilized process performance by minimizing residual fouling. Whichever pre‐treatment was applied, RO reached higher rejection coefficients and low fouling levels. Nevertheless, lower normalized flux (12%) was achieved when the UF effluent was fed due to high concentration of organic substances. Membrane autopsies by scanning electron microscopy with dispersive X‐ray and Fourier transform IR spectroscopy revealed that organic fouling appears to be predominant on both NF/RO membranes. The main organic foulants identified were polysaccharides and proteins. Inorganic foulants mainly consisted of calcium, phosphorus, and iron. Complete removal of pharmaceutical active compounds was observed for RO, while NF presented moderate retention coefficients (94, 85, 70, and 27% for atenolol, paraxanthine, caffeine and clofibric acid, respectively).

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Section: Resultssupporting

confidence: 89%

Nanofiltration/Reverse Osmosis as Pretreatment Technique for Water Reuse: Ultrafiltration Versus Tertiary Membrane Reactor

Díaz

Cabrera

Vera

et al. 2017

CLEAN Soil Air Water

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“…The deposition as a porous filter was able to retain soluble ammonium salts. And the salts can progressively modify the structure and permeability of the deposition …”

Section: Resultsmentioning

confidence: 99%

“…Element C was found mainly in the intermediate layer, revealing that tar oil had passed through the separation layer to foul the intermediate layer. The tar oil molecules entered the pores and then interacted with the membrane material to induce pore constriction, and reduce membrane permeability . No sulfur can be found in the cross‐section, suggesting that the membrane had excellent rejection of the ultrafine sulfur.…”

Section: Resultsmentioning

confidence: 99%

“…And the salts can progressively modify the structure and permeability of the deposition. 40 Figure 7(c) shows the SEM cross-section of the fouled membrane, and the corresponding EDX line scan. Element C was found mainly in the intermediate layer, revealing that tar oil had passed through the separation layer to foul the intermediate layer.…”

Section: Resistance Analysismentioning

confidence: 99%

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Ceramic micro/ultra‐filtration of low‐concentration ultrafine sulfur in desulfurization wastewater

Yin

Wang

Zhong

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND A low concentration of ultrafine suspended sulfur (SS) in the wastewater produced from the coking gas desulfurization process is a serious problem. In this study, ceramic microfiltration and ultrafiltration membranes were used to remove ultrafine SS for further recovery. RESULTS Results showed that membrane with a pore size of 0.05 µm at the operating conditions 0.15 MPa, 40 °C and 4.0 m s−1 experienced the lowest flux decline and degree of fouling in comparison with other conditions. All membranes exhibited good rejections of sulfur (>99.9%) and tar oil (>98.0%). The SS ranged from 1.5 to 34.0 g L−1 had no influence on the permeate turbidity (<1 NTU) but resulted in an increase in the tar oil content and a decrease in the permeate flux. SEM/EDX results indicated that the membrane surface was fouled by the sulfur particles and ammonium salts, while the tar oil entered the membrane pores. An effective cleaning method with high flux recovery (>98%) was applied to remove the foulants using mixed solutions of 1% (w/w) NaOH and 0.5% (w/w) NaClO. CONCLUSION The results showed that the ceramic membranes are effective in ultrafine sulfur removal from the wastewater. © 2016 Society of Chemical Industry

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“…The shear stresses is increased, but the fouling layer accumulated is not modified. (CHARFI et al, 2015).…”

Section: Alternatives To Minimize Foulingmentioning

confidence: 99%

Synthesis and characterization of polysulfone/nanoclay/polyethylene oxide composite ultrafiltration membranes.

Rodrigues¹

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Catalogação-na-publicaçãoRodrigues, Raphael Synthesis and characterization of polysulfone/nanoclay/polyethylene oxide composite ultrafiltration membranes / R. Rodrigues --versão corr. --São Paulo, 2016. 165 p. Palavras-chave: membranas de polisulfona, modificação de estrutura, nano-argila, PEO ABSTRACTMembrane structure modification is a common approach to enhance membrane properties and performance. For example, the addition of dopants to the membrane casting solution has been observed to increase hydrophilicity, alter surface and internal pore structure, increase thermal and mechanical resistance, and impart anti-fouling properties. In this study, it was evaluated how the addition of individual and simultaneous nanoclay and polyethylene oxide (PEO) dopants affected the structure and performance of polysulfone (PSU) ultrafiltration membranes. Membrane performance was evaluated in the cross-flow configuration. The pure water permeability of the neat PSU membrane was 15 L/m².h.bar and at the optimal dosage of the individually doped membranes was 1.5% weight nanoclay to PSU and 5% weight PEO to PSU resulting in permeability of 56 and 237 L/m².h.bar, respectively.Simultaneous doping using the optimal individual weight percentages had a lower effect resulting in a permeability of 192 L/m².h.bar, in contrast the simultaneous addition of 4.5% nanoclay and 5% PEO had a higher effect resulting in a permeability of 319 L/m².h.bar. The control membrane was compared to the referred membranes and with the 4.5% nanoclay membrane (best permeability only when combined with PEO). These membranes were further examined to determine dopant effects on pore microstructure, superficial charge, separation performance, and fouling susceptibility.In general, doping with nanoclay improved membrane thermal/mechanical resistance and permeability with minimal loss in rejection. Doping with PEO resulted in a greater permeability as compared to nanoclay; however, PEO doping decreased rejection, mechanical resistance, and increased irreversible fouling. Thus, both advantageous and disadvantageous effects should be considered when selecting a dopant to optimize membrane performance.

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Soluble microbial products and suspended solids influence in membrane fouling dynamics and interest of punctual relaxation and/or backwashing

Cited by 30 publications

References 28 publications

Nanofiltration/Reverse Osmosis as Pretreatment Technique for Water Reuse: Ultrafiltration Versus Tertiary Membrane Reactor

Nanofiltration/Reverse Osmosis as Pretreatment Technique for Water Reuse: Ultrafiltration Versus Tertiary Membrane Reactor

Ceramic micro/ultra‐filtration of low‐concentration ultrafine sulfur in desulfurization wastewater

Synthesis and characterization of polysulfone/nanoclay/polyethylene oxide composite ultrafiltration membranes.

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