Comparison of membrane fouling at constant flux and constant transmembrane pressure conditions

Miller, Daniel J.; Kasemset, Sirirat; Paul, Donald R; Freeman, Benny D.

doi:10.1016/j.memsci.2013.12.027

Cited by 178 publications

(110 citation statements)

References 46 publications

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“…The FLR also showed a slightly higher flux decline ratio compared with the FEn for all of the fouling resistance tests using dry milk, DTAB, and SDS. An additional fouling resistance test for which the FEn permeate flow rate was adjusted up to that of the FLR was conducted to further verify the effect of the permeate flow rate on the membrane fouling intensities [26,[40][41][42]. The operating pressure was carefully increased to match the permeate flow rate of the FEn to the FLR level.…”

Section: Laboratory Fouling Susceptibility Test and Pristine Membranementioning

confidence: 99%

Long-Term Stability of Low-Pressure Reverse Osmosis (RO) Membrane Operation—A Pilot Scale Study

Park

Kwon

2018

Water

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Reverse osmosis (RO) elements operating at a low pressure (LP) or a low energy (LE) are generally called "LPRO" or "LERO", and the nomenclature "LP" and "LE" are convertible due to the interrelated features of the pressure and the energy in the RO process. Not only can LPRO be operated at lower pressures, which enables energy saving, but also at the standard operating pressure with an enhanced permeate flux. In this study, the feasibility of the LPRO element was evaluated in the face of high fouling potential feed water. The commercially available standard RO and LPRO were chosen, and the membrane properties including the fouling susceptibility and the surface characteristics were thoroughly evaluated. The variations of various performance parameters were monitored during an 872 h operation in a pilot system, which was operated in a constant flux mode. Then, the used membranes were analyzed to further verify the fouling load localization and the fouling intensities. The average flux variation of the individual RO elements in a vessel and the economic feasibility of LPRO were also evaluated through a simulation study using an RO system design software. This study showed that the localization of fouling load within a pressure vessel of an LPRO system caused about 20% higher flux decline and almost 2-times higher salt passage than those of a standard RO membrane system. Furthermore, the simulation study predicted that average operating pressure difference ratio (%) between two RO membranes decreased from 24.4% to 17.8% and a substantial quantity of LPRO elements (83.3%) must be replaced to meet the designated water criteria only after 2 years' operation.

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Section: Laboratory Fouling Susceptibility Test and Pristine Membranementioning

confidence: 99%

Long-Term Stability of Low-Pressure Reverse Osmosis (RO) Membrane Operation—A Pilot Scale Study

Park

Kwon

2018

Water

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“…Due to the selective permeation of water ions, the concentration of rejected soluble salts increases near the membrane surface. The increase in the solubility limit of sparing soluble salts results in deposition on the membrane surface, which further cause an increase in TMP (Pontié et al 2005;Shirazi et al 2010;Kucera 2014;Miller et al 2014).…”

Section: Resultsmentioning

confidence: 99%

Inorganic fouling control in reverse osmosis wastewater reclamation by purging carbon dioxide

Shahid

Pyo

Choi

2017

Environ Sci Pollut Res

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Inorganic fouling on the membrane surface is one of the major prevalent issues affecting the performance and cost of reverse osmosis system. Chemical dosage is a widely adopted method for the inhibition of inorganic scale on the membrane surface. In this study, CO was used to control inorganic scale formation on surface of reverse osmosis (RO) membrane in wastewater reclamation. The pH of influent could be lowered by purging CO. It caused an increase in solubility of inorganic salts in water resulting in discharge of principle ions in concentrate stream. A pilot plant study was conducted with four different RO modules including control, with dosage of antiscalant, with purging CO and with co-addition of antiscalant and CO. The effectiveness of CO purging was assessed on the basis of operational analysis, in-line analysis and morphological results. Ryznar stability index was used to determine the scaling potential of system. The examined data indicated that CO purging was successful to inhibit scale formation on the membrane surface. Moreover, CO was found more eco-friendly than antiscalant, as no by-products were generated in concentrate stream.

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“…Others have also described this phenomenon [18][19][20][21][22]29,30]. Several studies have also shown constant flux operation increases the lifetime of the membrane and reduces the time for cleaning-in-place compared to constant trans-membrane pressure operation [31,32]. Nevertheless, constant flux operation is not practiced in the dairy industry.…”

Section: Constant Flux Operation For Charged Ultrafiltration Membranesmentioning

confidence: 99%

Negatively charged tangential flow ultrafiltration membranes for whey protein concentration

Arunkumar

Etzel

2015

Journal of Membrane Science

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Comparison of membrane fouling at constant flux and constant transmembrane pressure conditions

Cited by 178 publications

References 46 publications

Long-Term Stability of Low-Pressure Reverse Osmosis (RO) Membrane Operation—A Pilot Scale Study

Long-Term Stability of Low-Pressure Reverse Osmosis (RO) Membrane Operation—A Pilot Scale Study

Inorganic fouling control in reverse osmosis wastewater reclamation by purging carbon dioxide

Negatively charged tangential flow ultrafiltration membranes for whey protein concentration

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