Evaluation of fouling potential of nanofiltration membranes based on the dynamic contact angle measurements

Gryta, Marek; Bastrzyk, Justyna; Lech, Diana

doi:10.2478/v10026-012-0091-4

Cited by 20 publications

(5 citation statements)

References 23 publications

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“…In such cases, there is a change in the mass of the membrane sample and the wettability of its surface after each immersion, which in turn leads to a change in the calculated value of the contact angle. Based on this phenomenon, membrane fouling research can be carried out using the Wilhelmy plate method [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation

Gryta

2021

Membranes

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The influence of oil emulsion presence in the water on the course of water desalination by membrane distillation was studied. The feed water was contaminated by oil collected from the bilge water. The impact of feed composition on the wetting resistance of hydrophobic polypropylene membranes was evaluated during long-term studies. Two types of the capillary membranes fabricated by thermally induced phase separation method were tested. It has been found that these membranes were non-wetted during the separation of NaCl solutions over a period of 500 h of modules exploitation. The addition of oil (5–100 mg/L) to the feed caused a progressive decline of the permeate flux up to 30%; however, the applied hydrophobic membranes retained their non-wettability for the consecutive 2400 h of the process operation. It was indicated that several compounds containing the carbonyl group were formed on the membranes surface during the process. These hydrophilic compounds facilitated the water adsorption on the surface of polypropylene which restricted the oil deposition on the membranes used.

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Section: Resultsmentioning

confidence: 99%

Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation

Gryta

2021

Membranes

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“…Estas características também foram observadas por outros autores (KWAK et al,1999;LI et al, 2008;BROOMS, 2010;CRITTENDEN et al, 2012;GRYTA;BASTRZYK;LECH, 2012;FUJIOKA et al, 2013). Uma das razões de não ter havido diferença significativa entre os fluxos de permeado para as águas bruta e a pré-tratada tanto com o uso da membrana de nanofiltração quanto com a de osmose inversa pode ser quanto ao tempo reduzido de separação e por ter sido realizado em batelada com recirculação.…”

Section: Resultsunclassified

Avaliação da nanofiltração e da osmose inversa na remoção de carbofurano em águas de abastecimento

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et al. 2016

Eng. Sanit. Ambient.

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A complexidade físico-química de micropoluentes, como os defensivos agrícolas, exige o uso de tecnologias avançadas de tratamento de água para abastecimento. O objetivo deste estudo foi avaliar a remoção de carbofurano em nível de bancada (batelada) utilizando membranas comerciais de nanofiltração (NF90 -DowFilmtec®) e osmose inversa (HR -Koch Membrane Systems®). Nos experimentos foi avaliada a influência da qualidade da matriz de alimentação (água ultrapura, bruta e pré-tratada) contendo carbofurano (50 µgL ). Concluiu-se, portanto, que o pré-tratamento da água bruta não acarretou diferença significativa na remoção do carbofurano e não influenciou no fluxo de permeado de acordo com a metodologia adotada (baixo tempo de separação em batelada com recirculação). ABSTRACTThe physicochemical complexity of micropollutants such as pesticides requires the use of advanced technologies of drinking water treatment.The main objective of this study was to evaluate the removal of carbofuran using commercial nanofiltration (NF90 -DowFilmtec®) and reverse osmosis (HR -Koch Membrane Systems®) membranes in a bench-scale system (batch operation). The effect of feed matrix quality (ultrapure water, raw water and pretreated water) with carbofuran (50 µgL ). In accordance to the methodology adopted (low separation time in batch with recirculation), it can be concluded, therefore, that the pretreatment of raw water did not caused significant difference in carbofuran removal and did not influenced the permeate flux.

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“…the fact that the radiation penetration depth was higher than the thickness of the active layer. Identification of 6 the polymer bands of the active semi-aromatic polyamide layer is summarised in Table S1.1 (supplementary 7 information) [49][50][51][52][53][54][55][56]. The main changes were associated to the protonation of the piperazine amine groups 8 (NH 2+ ) and OHgroups with a wide band at 3400 cm -1 and to the presence of HSO 4 due to the appearance of three 9…”

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Application of nanofiltration for acidic waters containing rare earth elements: Influence of transition elements, acidity and membrane stability

et al. 2018

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14Acid mine drainage (AMD) is considered the main environmental problem in mining operation due to its acidity, 15 metal content (Fe, Al, Zn, Cu) and onerous associated treatment cost. However, the presence of relatively high 16 levels of added value elements (rare earth elements (REE)) could make its valorisation economically affordable. 17Membrane nanofiltration (NF) has been postulated as a potential recovery technology because it allows the 18 recovery of a sulphuric acid rich stream and a metal rich stream in one step. In this study, the performance of a 19 semi-aromatic polyamide NF membrane (NF270) in filtering model solutions containing common metals (Ca, Al, 20 Zn) in sulphuric solutions (pH 1.5-3.0) was evaluated. In a second stage, the performance was assessed with the 21 same model solutions but also containing REE. NF270 showed high rejections for metallic ions in solution, 22allowing acid permeation. Ion rejection data were used to determine membrane permeances to ions using the 23 solution-diffusion model considering reactive transport. The stability of the membrane was also studied by 24 comparing performances of a virgin membrane with an aged membrane exposed to 1 M sulphuric acid for 4 25 weeks. Physicochemical changes of membrane properties after ageing were also analysed by ATR-FTIR, AFM and 26 XPS. 27 28

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Evaluation of fouling potential of nanofiltration membranes based on the dynamic contact angle measurements

Cited by 20 publications

References 23 publications

Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation

Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation

Avaliação da nanofiltração e da osmose inversa na remoção de carbofurano em águas de abastecimento

Application of nanofiltration for acidic waters containing rare earth elements: Influence of transition elements, acidity and membrane stability

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