The formation and characterisation of an asymmetric nanofiltration membrane for ammonia–nitrogen removal: Effect of shear rate

Ali, Nora’aini; Halim, Nurul Syazana Abdul; Jusoh, Ahmad; Endut, Azizah

doi:10.1016/j.biortech.2009.08.070

Cited by 25 publications

(11 citation statements)

References 16 publications

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“…46 The casting speed also affects the membrane morphology, porosity and pore size which is attributed to the alternation of the molecular orientation caused by the induced shear rate. 35,[56][57][58] It was also shown that the overall thicknesses of the membrane as well as the top layer increased by increasing the casting knife gap. [59][60][61] The main objective of the present research was to perform a systematic investigation on the effect of key parameters involved in the development of asymmetric NF membranes from the viewpoint of formation, structural characteristics, productivity and separation performance.…”

Section: Introductionmentioning

confidence: 99%

Tailoring PES nanofiltration membranes through systematic investigations of prominent design, fabrication and operational parameters

Shahmirzadi

Hosseini

Ruan³

et al. 2015

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Tailoring PES nanofiltration membranes through systematic investigations of prominent design, fabrication and operational parameters

Shahmirzadi

Hosseini

Ruan³

et al. 2015

RSC Adv.

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“…The effect of shear rate has been previously reported to show an adverse effect on the resultant membrane performance when the polymer is cast [30,31]. Therefore, the effect of (Fig.…”

Section: The Effect Of Casting Speed On Membrane Performancementioning

confidence: 96%

Parametric optimisation for the fabrication of polyetherimide-sPEEK asymmetric membranes on a non-woven support layer

Ainscough

Oatley-Radcliffe

Barron

2017

Separation and Purification Technology

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Casting of a novel polyetherimide-sulfonated poly (ether ether ketone) membrane onto a non-woven support layer to improve mechanical strength and robustness of the resulting membrane is studied. The resultant membrane performance is optimised by considering the phase inversion parameters of polymer concentration, casting thickness, casting speed, evaporation time and coagulation bath temperature. Performance analysis was measured by membrane flux and rejection of PEG 10,000, along with structural characterisation of the membrane by SEM. Polymer concentration and coagulation bath temperature had the greatest influence on the final rejection properties of the membrane; increasing rejection from 0.72 to 0.96 when increasing from 16 wt% to 28 wt% and decreasing rejection from 0.95 to 0.60 when increasing the temperature from 3°C to 50°C respectively. Increasing the polymer concentration had the adverse effect of significantly reducing the permeation rate of the membrane from 50 LMH/bar to 1 LMH/bar when increasing from 16 wt% to 28 wt%. Using defined control of the phase inversion parameters the membrane was changed from an open pore ultrafiltration membrane with a molecular weight cutoff of >10 kDa to a much narrower pore size membrane in the nanofiltration range with a molecular weight 2 cutoff of ~3000 Da. The fabrication process for the optimised membrane is far more robust than the original process and is suitable for membrane mass production.

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“…Phosphate anions, H 2 PO À 4 and HPO 2À 4 , were also demonstrated to be retained by NF200 at 85% and at 96%, respectively (Ballet et al 2007). Other authors have reported that polyethersulphone membranes rejected up to nearly 70% of NH 3 eN in solution (Ali et al, 2010). NF membranes have a potential role in the recovery of valuable resources from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Moving towards sustainable resources: Recovery and fractionation of nutrients from dairy manure digestate using membranes

et al. 2015

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The fractionation of nitrogen (as ammonia/ammonium) and phosphorus (as phosphate ions) present in the dairy manure digestate was investigated using a nanofiltration membrane NF270. The filtration and separation efficiencies were correlated to pH across the range 3 < pH < 11. Filtration at pH 11 enabled higher permeate flux of 125-150 LMH at 20 bar, however rejection of ammonia was high at 30-36% and phosphate was 96.4-97.2%. At pH 3 and pH 7, electrostatic charge effects led to higher permeation of ammonium and thus more efficient separation of nitrogen. The rejection of phosphorus was relatively constant at any given pH and determined as 83% at pH 3, 97% at pH 7 and 95% at pH 11. The fractionation of nitrogen and phosphorus from complex aqueous solutions was demonstrated to be highly dependent on the charge of the membrane and ionic speciation. Solutions rich in nitrogen (as ammonia/ammonium) were obtained with almost no phosphorus present (<1 ppm) whilst the purification of the PO4-P was achieved by series of diafiltration (DF) operations which further separated the nitrogen. The separation of nutrients benefited from an advantageous membrane process with potential added value for a wide range of industries. The analysis of the process economics for a membrane based plant illustrates that the recovery of nutrients, particularly NH3-N, may be commercially feasible when compared to manufactured anhydrous NH3.

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The formation and characterisation of an asymmetric nanofiltration membrane for ammonia–nitrogen removal: Effect of shear rate

Cited by 25 publications

References 16 publications

Tailoring PES nanofiltration membranes through systematic investigations of prominent design, fabrication and operational parameters

Tailoring PES nanofiltration membranes through systematic investigations of prominent design, fabrication and operational parameters

Parametric optimisation for the fabrication of polyetherimide-sPEEK asymmetric membranes on a non-woven support layer

Moving towards sustainable resources: Recovery and fractionation of nutrients from dairy manure digestate using membranes

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