An evaluation of industrial ultrafiltration systems for surface water using fouling indices as a performance indicator

Zupančič, Matevž; Novák, D.; Diaci, Janez; Golobič, Iztok

doi:10.1016/j.desal.2014.04.002

Cited by 24 publications

(7 citation statements)

References 20 publications

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“…Micro-coagulation resulted in a significant increase in HC efficiency, both in summer and in winter (5 and 15% respectively; 0.05 significance), which is in accordance with Zupančič et al 56 as well as a decrease in its variability. In this study, probably the coagulant dosage enabled the formation of a cake which acted like a filter aid, preventing molecules with high fouling potential reaching the membrane.…”

Section: Coagulant Effect On Hydraulic Resistance Recovery By Hc and Cebsupporting

confidence: 89%

Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

Ferrer

Dekker

Mesa

et al. 2016

J of Chemical Tech & Biotech

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Background\ud \ud The feasibility and competitiveness of substituting the conventional pre-treatment of drinking water treatment plants (dioxichlorination, coagulation/flocculation, settling, sand filtration) by raw river water direct ultrafiltration (UF) was addressed.\ud \ud Results\ud \ud A full scale UF module was operated continuously for 2 years, treating highly variable surface water. The sustainable hydraulic conditions leading to a greater water yield from the direct UF treatment scheme under different scenarios were defined. Summer periods enabled the attainment of higher filtration fluxes, although raw river water showed greater turbidity and total suspended solids content. Winter periods presented higher dissolved organic carbon concentration, with greater biopolymers content, which have been claimed as main membrane foulants. A preliminary micro-coagulation of FeCl3 (<1.5 mg Fe(III) L-1) enabled supporting harsher hydraulic conditions and thus, implementing similar conditions throughout the year. Impacts of micro-coagulation were more pronounced on filtration, particularly in winter, but a positive effect was also noticed in hydraulic and chemical cleaning stages, increasing the efficiency of the former and decreasing by half the frequency of the latter.\ud \ud Conclusion\ud \ud Direct UF proved to be competitive with the current conventional pre-treatment, leading to a significant reduction in reagents needs and sludge production and an increased and more stable product water quality. © 2016 Society of Chemical IndustryPeer ReviewedPostprint (author's final draft

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Section: Coagulant Effect On Hydraulic Resistance Recovery By Hc and Cebsupporting

confidence: 89%

Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

Ferrer

Dekker

Mesa

et al. 2016

J of Chemical Tech & Biotech

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“…, respectively. Higher differences were found regarding the irreversible fouling, in which the HIFI 30 , respectively. Also, the BW efficiencies dropped from 98 ± 3% to 94 ± 3% during filtration at 30 and 60 minutes, respectively.…”

Section: Influence Of Bw Frequencies On Membrane Filtration Performancementioning

confidence: 93%

“…They found that coagulation had a positive impact on both reversible and irreversible fouling. However, in their system the turbidity was much higher (>5 NTUs) [27][28][29][30].…”

Section: Evaluation Of Nom Removal By Uf Bench Experiments Usingmentioning

confidence: 99%

Assessment of Ultrafiltration Cleaning Protocols in Drinking Water Treatment Processes

Vera¹,

Martín-Alonso²,

Mesa³

et al. 2017

J Chem Eng Process Technol

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Membrane-based processes efforts are focused on mitigating membrane fouling by optimizing operating conditions, especially when low quality surface waters are treated. The study conducted here was driven to evaluate the current measures applied to mitigate fouling in Ultrafiltration (UF) stages when integrated as a pre-treatment of the Reverse Osmosis (RO) in a Drinking Water Treatment Plant (DWTP). First, the effect of coagulants in fouling and water quality was evaluated by using synthetic and surface waters in bench-scale. Both aluminum and ironbased coagulants rejected the organic compounds when dosed above 1 mg·L -1 . Also, micro-coagulation with FeCl 3 previous to the UF impacted positively the membrane performance. Then, two modes of operation were proposed and tested in bench-scale to improve the cleaning strategies when filtering waters from different sources. The results highlighted the feasibility to apply a different cleaning protocol when groundwater was filtered as it would improve the water yield and production by elongating the filtration times. To conclude, an exploratory analysis reviewed the membrane performance and cleaning strategies in the Ultrafiltration stage at full-scale during 1 year of operation. The results showed high variations in Specific flux (Js) throughout the year and, also, suggested that chemical cleaning procedures were being applied in excess.

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“…The filtration strengths for UF tests under CP and CF modes are also listed in The performance of UF membrane during periodic filtration-backwash was evaluated via two indexes, i.e., total fouling index (TFI) and hydraulic irreversible fouling index (HIFI). The values of TFI were measured by linear regression method (Huang et al, 2008;Nguyen et al, 2011;Zupančič et al, 2014).…”

Section: Experimental Protocol and Backwash Evaluationmentioning

confidence: 99%

Effect of filtration mode and backwash water on hydraulically irreversible fouling of ultrafiltration membrane

et al. 2017

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To investigate the effect of filtration mode and backwash water on ultrafiltration (UF) membrane performance, total fouling index (TFI) and hydraulic irreversible fouling index (HIFI) for constant pressure (CP) filtration and constant flux (CF) filtration were compared. Kaolin, humic acid (HA) and sodium alginate (SA) solutions were used as feed solutions, and then the fouled membranes were backwashed with UF permeate or ultrapure water. Results showed that when the kaolin solution was filtrated, the filtration mode had a limited effect on the membrane fouling, and low TFI and HIFI were observed. When HA and SA solutions were filtrated, the TFI of UF under CP mode was comparable to or slightly higher than that under CF mode. Higher TFI was observed at a hydrophobic membrane, a high filtration strength, a high feed concentration, a low pH, a high ionic strength, and a low Ca concentration. When the UF permeate was used as the backwash water, the HIFI for the UF operated under CF mode was significantly less than that under CP mode. Low irreversible fouling was obtained when the ultrapure water was used for backwashing, and the HIFI for the UF under different filtration modes was almost identical.

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An evaluation of industrial ultrafiltration systems for surface water using fouling indices as a performance indicator

Cited by 24 publications

References 20 publications

Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

Assessment of Ultrafiltration Cleaning Protocols in Drinking Water Treatment Processes

Effect of filtration mode and backwash water on hydraulically irreversible fouling of ultrafiltration membrane

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