Fouling characterization during initial stage of cross-flow ultrafiltration

Hernández, M.; Melián-Martel, N.; Ruiz-García, A.; Río-Gamero, B. Del

doi:10.1016/j.jwpe.2020.101611

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…The J′ decline rate and TMP increase rate in the first 10 min of filtration were directly proportional to the SA concentration, and good linear fits were obtained, as shown in Figure 2c. This phenomenon was in good agreement with the previously reported observations during the initial stage of cross‐flow ultrafiltration of SA with concentrations of 5–40 mg/L (Hernández et al, 2020). An 81.7% flux reduction and 170.6% TMP increase occurred when the SA concentration was increased from 20 to 500 mg/L after 60 min of microfiltration, as shown in Figure 2d.…”

Section: Resultssupporting

confidence: 93%

“…However, membrane fouling by organic pollutants affects the membrane performance by reducing the flux and increasing the transmembrane pressure (TMP), leading to a shortened membrane lifespan and increased operating costs (Loulergue et al, 2014; Martí‐Calatayud et al, 2018). Soluble extracellular polymeric substances (sEPS), transparent exopolymer particles (TEP), and soluble microbial products (SMP) have been reported to be the main organic pollutants for various membrane systems (e.g., membrane bioreactors, microfiltration, ultrafiltration, and reverse osmosis) (Hernández et al, 2020; Meng, Liu, Zhao et al, 2019; Mohamadi et al, 2020; Sim et al, 2018). These pollutants can easily attach to membrane surfaces by forming a sticky gel layer or adhering to the inner walls of the membrane pores, causing severe pore blocking (Lishman et al, 2020; Wang et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Mitigation of membrane fouling of alginate with combined actions of aeration and powdered activated carbon: Fouling behaviors and mechanisms

Liu

2022

Water Environment Research

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A laboratory-scale flat-sheet ceramic microfiltration membrane system was developed to investigate the membrane fouling behaviors and mechanisms of sodium alginate (SA) in the presence of aeration and powdered activated carbon (PAC). When the SA concentration increased from 20 to 500 mg/L, the permeate flux decreased by 81.7%, and the transmembrane pressure (TMP) and resistance increased 1.7 and 24.5 times, respectively. At an SA concentration of 500 mg/L, it was found that the membrane fouling tended to decrease with the increase in the aeration rate, indicating high control of the fouling by air scouring, while PAC-aeration scouring produced a significant improvement in the permeate flux with substantially reduced fouling. In the microfiltration of 500 mg/L SA at an air flow rate of 2.2 L/min and PAC concentrations of 40, 100, and 250 mg/L, the flux increased by 179.3%, 238.0%, and 302.7%, the TMP decreased by 32.6%, 34.8%, and 45.7%, and the cake and pore blocking resistance decreased by 78.0%, 85.1%, and 87.9%, respectively, compared to the corresponding values without PAC-aeration scouring. Intermediate blocking and complete blocking models were confirmed to elucidate the effect of aeration scouring and PAC-aeration scouring on the mitigation of membrane fouling by SA. Practitioner Points• Air scouring was effective at mitigating membrane fouling of sodium alginate.• The addition of PAC could alleviate membrane fouling of SA.• Synergistic scouring by aeration and PAC offers a promising means for more-efficient and cost-effective control of membrane fouling.• The fouling mechanisms in various scenarios were elucidated.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Mitigation of membrane fouling of alginate with combined actions of aeration and powdered activated carbon: Fouling behaviors and mechanisms

Liu

2022

Water Environment Research

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“…Moreover, the fouling resistance increased with the increased mass ratio of alginate in the mixture, particularly at high fluxes. Hernández et al [21] studied the fouling induced by polyethylene glycol (PEG) and alginate at different concentrations in the initial filtration stage of cross-flow UF using an empirical adjustment of flux decline data based on a bi-exponential equation with four coefficients. The results showed varying degrees of increase in resistance depending on the type of solution and membrane used.…”

Section: Pilot Plant Evaluation Of System Performancementioning

confidence: 99%

A Comprehensive Review on Membrane Fouling: Mathematical Modelling, Prediction, Diagnosis, and Mitigation

AlSawaftah

Abuwatfa

Darwish

et al. 2021

Water

132

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Membrane-based separation has gained increased popularity over the past few decades, particularly reverse osmosis (RO). A major impediment to the improved performance of membrane separation processes, in general, is membrane fouling. Fouling has detrimental effects on the membrane’s performance and integrity, as the deposition and accumulation of foulants on its surface and/or within its pores leads to a decline in the permeate flux, deterioration of selectivity, and permeability, as well as a significantly reduced lifespan. Several factors influence the fouling-propensity of a membrane, such as surface morphology, roughness, hydrophobicity, and material of fabrication. Generally, fouling can be categorized into particulate, organic, inorganic, and biofouling. Efficient prediction techniques and diagnostics are integral for strategizing control, management, and mitigation interventions to minimize the damage of fouling occurrences in the membranes. To improve the antifouling characteristics of RO membranes, surface enhancements by different chemical and physical means have been extensively sought after. Moreover, research efforts have been directed towards synthesizing membranes using novel materials that would improve their antifouling performance. This paper presents a review of the different membrane fouling types, fouling-inducing factors, predictive methods, diagnostic techniques, and mitigation strategies, with a special focus on RO membrane fouling.

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