Effect of membrane chemistry and coating layer on physiochemical properties of thin film composite polyamide RO and NF membranes

Tang, Chuyang Y.; Kwon, Young‐Nam; Leckie, James O.

doi:10.1016/j.desal.2008.04.003

Cited by 916 publications

(609 citation statements)

References 31 publications

Supporting

Mentioning

553

Contrasting

Unclassified

Order By: Relevance

“…The active skin layer of commercial NF/RO membranes typically has a complex structure with a surface roughness of 0.05 to 0.20 µm [27,35]. The surface roughness of the skin layer can be observed using scanning electron microscopic (SEM), as seen in the image of the ESPA2 RO membrane (Hydranautics) ( than TFC RO membranes, which requires RO systems using CTA membranes to be operated at a lower permeate flux than systems using TFC membranes.…”

Section: Polyamidementioning

confidence: 99%

“…The contact angle is defined as the angle between the solid surface (membrane) and the liquid (water) droplet, and is measured using a goniometer. The contact angle of NF/RO membrane surfaces ranges from 20 to 50° [27]. It is worth mentioning that the surface hydrophobicity can change over long-term system operation due to fouling and …”

Section: Membrane Hydrophobicitymentioning

confidence: 99%

“…sulfonic acid and carboxylic acid) of the active skin layer. A list of typical NF/RO membranes and their zeta potentials is presented in Table 9.3 [27]. Recently, NF and RO membranes with a weak negative charge have been developed to reduce membrane fouling by minimising the charge interactions between the membrane and charged organic matter.…”

Section: Membrane Chargementioning

confidence: 99%

See 2 more Smart Citations

Removal of Emerging Contaminants for Water Reuse by Membrane Technology

Nghiem

Fujioka

2016

Emerging Membrane Technology for Sustainable Water Treatment

View full text Add to dashboard Cite

Section: Polyamidementioning

confidence: 99%

Section: Membrane Hydrophobicitymentioning

confidence: 99%

Section: Membrane Chargementioning

confidence: 99%

See 1 more Smart Citation

Removal of Emerging Contaminants for Water Reuse by Membrane Technology

Nghiem

Fujioka

2016

Emerging Membrane Technology for Sustainable Water Treatment

View full text Add to dashboard Cite

“…Many studies showed that compared to uncoated membranes, less fouling was observed when membranes surfaces had a hydrophilic coating [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Coating of reverse osmosis membranes with amphiphilic copolymers for biofouling control

Bucs¹,

Linares²,

Siddiqui³

et al. 2017

Desalination and Water Treatment

View full text Add to dashboard Cite

a b s t r a c tSurface coating of membranes may be a promising option to control biofilm development and biofouling impact on membrane performance of spiral-wound reverse osmosis (RO) systems. The objective of this study was to investigate the impact of an amphiphilic copolymer coating on biofilm formation and biofouling control. The coating was composed of both hydrophilic and hydrophobic monomers hydroxyethyl methacrylate (HEMA) and perfluorodecyl acrylate (PFA), respectively. Commercial RO membranes were coated with HEMA-PFA copolymer film. Long and short term biofouling studies with coated and uncoated membranes and feed spacer were performed using membrane fouling simulators (MFSs) operated in parallel, fed with water containing nutrients. For the long-term studies pressure drop development in time was monitored and after eight days the MFSs were opened and the accumulated biofilm on the membrane and spacer sheets was quantified and characterized. The presence of the membrane coating was determined using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). Results showed that the amphiphilic coating (i) delayed biofouling (a lower pressure drop increase by a factor of 3 and a lower accumulated active biomass amount by a factor of 6), (ii) influenced the biofilm composition (23% lower polysaccharides and 132% higher protein content) and (iii) was still completely present on the membrane at the end of the biofouling study, showing that the coating was strongly attached to the membrane surface. Using coated membranes and feed spacers in combination with advanced cleaning strategies may be a suitable way to control biofouling.

show abstract

“…The thickness and chemical nature of the resin coating, number of micro-cracks in the surface and fertilizer granule size also contribute to determine the nutrient release curve over time (Trenkel, 1997). Enhanced-efficiency fertilizers area new tool to stabilize fertilizer consumption and minimize environmental pollution (Tang et al, 2009;Machado et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Ammonia volatilization and yield components after application of polymer-coated urea to maize

Zavaschi¹,

Faria

Vitti

et al. 2014

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

SUMMARYA form of increasing the efficiency of N fertilizer is by coating urea with polymers to reduce ammonia volatilization. The aim of this study was to evaluate the effect of polymer-coated urea on the control of ammonia volatilization, yield and nutritional characteristics of maize. The experiment was carried out during one maize growing cycle in 2009/10 on a Geric Ferralsol, inUberlândia, MG, Brazil. Nitrogen fertilizers were applied as topdressing on the soil surface in the following urea treatments: polymer-coated urea at rates of 45, 67.5 and 90 kg ha -1 N and one control treatment (no N), in randomized blocks with four replications. Nitrogen application had a favorable effect on N concentrations in leaves and grains, Soil Plant Analysis Development (SPAD) chlorophyll meter readings and on grain yield, where as coated urea had no effect on the volatilization rates, SPAD readings and N leaf and grain concentration, nor on grain yield in comparison to conventional fertilization.Index terms: nitrogen, polymer-coated urea, N fertilizer, ammonia volatilization, Zea mays, SPAD reading.( Uma das maneiras de aumentar a eficiência dos fertilizantes nitrogenados, visando, por exemplo, à redução de perdas de amônia por volatilização, é o revestimento desses com polímeros. Objetivou-se avaliar o efeito da aplicação de ureia revestida com polímeros no controle da volatilização de amônia e a sua influência nos componentes da produção na cultura do milho. O experimento foi instalado na safra 2009/10 no município de Uberlândia, MG, em um Latossolo Vermelho-Amarelo (LVA) distrófico textura argilosa. Os tratamentos consistiram na aplicação, em cobertura no milho, de ureia revestida com polímeros e ureia convencional nas doses de 45; 67,5; e 90 kg ha -1 de N, mais um tratamento-controle (sem N), dispostos em blocos casualizados. A aplicação de N influenciou positivamente o teor do nutriente nas folhas e nos grãos, a leitura SPAD e a produtividade de grãos, porém a ureia revestida não alterou as taxas de volatilização de amônia, a leitura SPAD e o teor de N nas folhas e grãos, assim como a produtividade de grãos em relação à aplicação do fertilizante convencional.Termos de indexação: nitrogênio, ureia revestida com polímeros, fertilizante nitrogenado, volatilização de amônia, Zea mays, leitura SPAD.

show abstract

Effect of membrane chemistry and coating layer on physiochemical properties of thin film composite polyamide RO and NF membranes

Cited by 916 publications

References 31 publications

Removal of Emerging Contaminants for Water Reuse by Membrane Technology

Removal of Emerging Contaminants for Water Reuse by Membrane Technology

Coating of reverse osmosis membranes with amphiphilic copolymers for biofouling control

Ammonia volatilization and yield components after application of polymer-coated urea to maize

Contact Info

Product

Resources

About