Comparison of DMF and UF pre-treatments for particulate material and dissolved organic matter removal in SWRO desalination

Guastalli, Andrea R.; Simon, F. Xavier; Penru, Y.; Kerchove, Alexis de; Llorens, Joan; Baig, Sylvie

doi:10.1016/j.desal.2013.05.005

Cited by 47 publications

(24 citation statements)

References 37 publications

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“…Similar to surface-water treatment, the low solids content in these applications allows the low-pressure membranes to be operated in the dead-end filtration mode with intermittent backwashing. The main advantages of membrane filtration compared to conventional pretreatments such as coagulation, flocculation, and sand filtration are improved water quality, smaller footprint, less chemical requirements, and consistent quality of the filtrate [38,39,52,53]. Higher energy demand and membrane fouling are the main disadvantages of having a membrane-filtration system for RO pretreatment.…”

Section: Pretreatment For Ro Desalination and Reclamationmentioning

confidence: 99%

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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Abstract:The submerged membrane filtration concept is well-established for low-pressure microfiltration (MF) and ultrafiltration (UF) applications in the water industry, and has become a mainstream technology for surface-water treatment, pretreatment prior to reverse osmosis (RO), and membrane bioreactors (MBRs). Compared to submerged flat sheet (FS) membranes, submerged hollow fiber (HF) membranes are more common due to their advantages of higher packing density, the ability to induce movement by mechanisms such as bubbling, and the feasibility of backwashing. In view of the importance of submerged HF processes, this review aims to provide a comprehensive landscape of the current state-of-the-art systems, to serve as a guide for further improvements in submerged HF membranes and their applications. The topics covered include recent developments in submerged hollow fiber membrane systems, the challenges and developments in fouling-control methods, and treatment protocols for membrane permeability recovery. The highlighted research opportunities include optimizing the various means to manipulate the hydrodynamics for fouling mitigation, developing online monitoring devices, and extending the submerged HF concept beyond filtration.

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Section: Pretreatment For Ro Desalination and Reclamationmentioning

confidence: 99%

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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“…On one hand, statistically significant reductions in TCDs were observed for DAF systems compared to systems operating without coagulation, whereas no statistically significant differences were found between systems operating with DAF and those with coagulation. It was likely that the above discrepancies observed in the results of the pMFA were due to: (1) the high variability of reported removal efficiencies of algal cells in DAF systems (i.e., 43-93%) and (2) the scarcity of studies (N = 3) examining algal cell removal in DAF systems [42,47,48]. The high variability in reported algal removal efficiencies from DAF systems results directly from the site specific algal species composition during the evaluation period for each study [12].…”

Section: Contribution Of the Studymentioning

confidence: 82%

“…An equally important aspect to consider in future study (that was neglected in this study) is the removal of dissolved toxins in DAF systems. Previous studies have indicated considerable biopolymer and humic acid removal in these systems [12,42,48]; therefore, the removal of other soluble organics, such as algal toxins, would greatly improve the accuracy of future pMFA simulations.…”

Section: Contribution Of the Studymentioning

confidence: 99%

“…Uniform probability distributions were used in the pMFA model for MF/UF systems considering the small number of reported observations from the literature ( Table 2). DAF algal cell removals were obtained from reports of a mixture of laboratory, pilot, and full-scale experiments [42,47,48]. The reported range in algal cell removal efficiencies ranged between 43-93%, likely due to the variations in algal cells encountered and doses/types of coagulants used (Table 2).…”

Section: Intracellular and Dissolved Toxin Removal Efficienciesmentioning

confidence: 99%

“…Algal cell removals through GMF systems were compiled based on pilot or full-scale SWRO studies reported in the literature (Table 2) [16,[35][36][37][38][39][40][41][42]. A pooled mean and standard deviation of algal cell removal for GMF systems with and without coagulation was calculated and fitted to a normal probability distribution (Table 2).…”

Section: Intracellular and Dissolved Toxin Removal Efficienciesmentioning

confidence: 99%

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Investigation of Algal Biotoxin Removal during SWRO Desalination through a Materials Flow Analysis

Manheim

Jiang

2017

Water

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Abstract:The operation of seawater reverse osmosis (SWRO) desalination facilities has become challenged by the increasing frequency and severity of harmful algal blooms (HABs). The efficiency of algal toxins removal during SWRO and pretreatment processes has critical human health implications. Therefore, a probabilistic materials flow analysis (pMFA) was developed to predict the removal of algal toxins in source water by various pretreatment configurations and operations during SWRO desalination. The results demonstrated that an appreciable quantity of toxins exists in the SWRO permeate (ng/L-µg/L levels), the backwash of pretreatment, and final brine rejects (µg/L-mg/L levels). Varying the pretreatment train configuration resulted in statistically significant differences in toxin removals, where higher removal efficiencies were evidenced in systems employing microfiltration/ultrafiltration (MF/UF) over granular media filtration (GMF). However, this performance depended on operational practices including coagulant addition and transmembrane pressures of MF/UF systems. Acute human health risks during lifetime exposure to algal toxins from ingestion of desalinated water were benign, with margins of safety ranging from 100 to 4000. This study highlights the importance of pretreatment steps during SWRO operation in the removal of algal toxins for managing marine HABs.

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Self‐doped sulfonated polyaniline ultrafiltration membranes with enhanced chlorine resistance and antifouling properties

Alhweij

Amura

Wenk

et al. 2021

J of Applied Polymer Sci

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Membranes heavily rely on chlorination to diminish (bio)fouling, but chlorination can also lead to membrane degradation. We developed sulfonated polyaniline (S‐PANI) ultrafiltration (UF) membranes with improved chlorine resistance and intrinsic antifouling properties. The S‐PANI membranes were synthesized through Non‐solvent Induced Phase Separation (NIPS). Membrane performance was evaluated under harsh chlorine conditions (250 ppm sodium hypochlorite for 3 days under different pH conditions). The S‐PANI membranes showed improved chlorine resistance including a stable performance without changes in model foulant BSA rejection. In contrast, PANI membranes suffered critical structural damage with complete leakage and commercial PES membranes showed a 76% increase in pure water flux and a noticeable change in BSA rejection. Small changes in S‐PANI membrane performance could be linked to membrane structural changes with pH, as confirmed by SEM, IR spectroscopy, and contact angle measurements. Additionally, the S‐PANI membranes showed better antifouling properties with a high flux recovery ratio in comparison to PANI membranes using alginic acid, humic acid, and BSA model foulants. Chemical cleaning by sodium hypochlorite re‐instated the transport properties to its initial condition. Overall, the developed S‐PANI membranes have a high chlorine tolerance and enhanced antifouling properties making them promising for a range of UF membrane applications.

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Comparison of DMF and UF pre-treatments for particulate material and dissolved organic matter removal in SWRO desalination

Cited by 47 publications

References 37 publications

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

Investigation of Algal Biotoxin Removal during SWRO Desalination through a Materials Flow Analysis

Self‐doped sulfonated polyaniline ultrafiltration membranes with enhanced chlorine resistance and antifouling properties

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