Fouling effects of polysaccharides and humic acid in nanofiltration

Mänttäri, Mika; Puro, Liisa; Nuortila‐Jokinen, Jutta; Nyström, Marianne

doi:10.1016/s0376-7388(99)00215-x

Cited by 156 publications

(62 citation statements)

References 22 publications

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“…During the peat water filtration, rejection of humic substances is not only affected by the membrane pore size. The accumulation of humic substances on the polysulfone membrane is also attributed to hydrophobic interaction between the membrane surface and humic substances molecules [33,34]. The increase of polysulfone concentration improves the membrane hydrophobicity, which then escalates the humic substances accumulation on the membrane surface.…”

Section: Resultsmentioning

confidence: 99%

The effect of polymer concentration on flux stability of polysulfone membrane

Ariono

Aryanti

Subagjo

et al. 2017

AIP Conference Proceedings

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Abstract. The influence of various polymer concentrations on flux stability of polysulfone membranes was investigated. The polysulfone membrane was prepared by blending polysulfone in DMAc with 25%wt concentration of PEG400 and 4% wt concentration of acetone. It was found that the pure water flux was sharply decreased from 1230 to 7 Lm-2h-1, when the polysulfone concentration was increased from 14% to 24%wt. Furthermore, the increase of polysulfone concentration also affects the fouling behavior of the membranes, in which almost of 90% of FRR was achieved by the addition of 18 %wt of polysulfone concentration. It was suggested that fouling formed on the membrane surface was dominated by reversible fouling, thus it could be easily cleaned by flushing method. In addition, the applied transmembrane pressure (TMP) also plays an important role in fouling behavior of polysulfone membrane. It was observed that irreversible fouling of organic matter was deteriorated by the increase of TMP, which contributed to the reduction of water flux. More stable membrane flux performance was achieved although it was operated at high TMP, when 20% wt concentration of polysulfone was added into membrane solution.

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Section: Resultsmentioning

confidence: 99%

The effect of polymer concentration on flux stability of polysulfone membrane

Ariono

Aryanti

Subagjo

et al. 2017

AIP Conference Proceedings

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“…Membrane separation processes can be tailored to meet the wanted degree of purification by choosing the appropriate membranes with convenient membrane weight cut offs (MWCOs) and the right operational conditions, such as applied pressures. The choice of membrane and operating conditions has a considerable impact on the purification efficiency, on the process problems (such as membrane fouling), and the economics of the fractionation process (Mänttäri et al 2000;Persson and Jönsson 2010;Koivula et al 2011;Puro et al 2011).…”

Section: Fractionation Of Pretreatment Effluentsmentioning

confidence: 99%

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

Lehto

Alén

2015

BioResources

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The chemical industry is being forced to evaluate new strategies for more effective utilization of renewable feedstocks to diminish the use of fossil resources. In this literature review, the integration of both acidic and alkaline pretreatment phases of hardwood and softwood chips with chemical pulping is discussed. Depending on the pretreatment conditions, high-volume sulfur-free fractions with varying chemical compositions can be produced. In case of acidic pretreatments, the major products include carbohydrates (mono-, oligo-, and polysaccharides), whereas under alkaline (i.e., aqueous NaOH) pretreatment conditions, the sulfur-free fractions of aliphatic carboxylic acids, lignin, and extractives are primarily obtained. All these fractions are potentially interesting groups of compounds and can be used in a number of applications. Finally, the effects of pretreatments on pulping are also considered. Although it is believed that there are important advantages to be gained by integrating this type of renewable raw material-based production, in particular, with kraft pulping, sulfur-free pulping methods such as soda-AQ and oxygen/alkali delignification processes are also briefly discussed.

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“…For both the un-grafted and the UV-grafted membranes, before and after NF experiments with humic acid solution, the system was washed with deionized water and the pure water permeation flux (J wf ) was measured again in order to evaluate the irreversible fouling in terms of pure water flux reduction, called hereafter irreversible fouling factor (FR w ). This is determined as follows [26,27].…”

Section: Membrane Characterizationmentioning

confidence: 99%

UV-photografting modification of NF membrane surface for NOM wfouling reduction

Nizam

Hilal

Khayet

2013

Desalination and Water Treatment

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A B S T R A C TFouling of natural organic matter is one of the common problems in water treatment plant. Despite physical and chemical treatment normally used to recover the flux loss, membrane surface properties also not less important to be considered. In this study, UV-photografting technique was applied to modify commercial nanofiltration (NF) membrane surface in order to reduce fouling tendency. Neutral hydrophilic N-vinylpyrrolidone has been chosen as the monomer for the UV-photografting. The result revealed that the grafted membrane at optimum conditions exhibits low humic acid fouling tendency compared with the unmodified membrane. In addition, both the unmodified and the UV-grafted polyethersulfone NF membranes were characterized in terms of structural properties (pore size, r p, and ratio of membrane thickness to porosity, Dx/A k ) using Pore Model in order to evaluate the effect of UV-photografting modification on structural parameters and indirectly influence the membrane performance and fouling as well.

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Fouling effects of polysaccharides and humic acid in nanofiltration

Cited by 156 publications

References 22 publications

The effect of polymer concentration on flux stability of polysulfone membrane

The effect of polymer concentration on flux stability of polysulfone membrane

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

UV-photografting modification of NF membrane surface for NOM wfouling reduction

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