Ferrous-activated sodium percarbonate pre-oxidation for membrane fouling control during ultrafiltration of algae-laden water

Ren, Zixiao; Cheng, Xiaoxiang; Li, Peijie; Luo, Congwei; Tan, Fengxun; Zhou, Weiwei; Liu, Wenchen; Lü, Zheng; Wu, Daoji

doi:10.1016/j.scitotenv.2020.140030

Cited by 45 publications

(10 citation statements)

References 41 publications

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“…Feed pretreatment relies on the use of coagulants and adsorbents to promote the formation of cells and AOM aggregates that, in turn, are easily removed from the membrane surface and show better filterability properties upon attachment (Huang et al, 2019;Xing et al, 2019;Zhang Y. et al, 2020;Xu et al, 2021). Alternatively, oxidants are increasingly used in pretreatment to reduce and mineralize the concentration of the smaller organics fraction responsible for irreversible fouling (Liu et al, 2018;Lee et al, 2019Lee et al, , 2021Wan et al, 2019;Ren et al, 2020). Despite their positive impacts on the fouling mitigation, primary challenges arose from concerns related to the effect of the chemical agents on the algal biomass, their release into the environment, and the high energy and capital expenses demanded by these techniques (Discart et al, 2015;Alshahri et al, 2021b).…”

Section: Developments and Challenges Of Algal Fouling Controlmentioning

confidence: 99%

Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

2021

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The use of algal biotechnologies in the production of biofuels, food, and valuable products has gained momentum in recent years, owing to its distinctive rapid growth and compatibility to be coupled to wastewater treatment in membrane photobioreactors. However, membrane fouling is considered a main drawback that offsets the benefits of algal applications by heavily impacting the operation cost. Several fouling control strategies have been proposed, addressing aspects related to characteristics in the feed water and membranes, operational conditions, and biomass properties. However, the lack of understanding of the mechanisms behind algal biofouling and control challenges the development of cost-effective strategies needed for the long-term operation of membrane photobioreactors. This paper reviews the progress on algal membrane fouling and control strategies. Herein, we summarize information in the composition and characteristics of algal foulants, namely algal organic matter, cells, and transparent exopolymer particles; and review their dynamic responses to modifications in the feedwater, membrane surface, hydrodynamics, and cleaning methods. This review comparatively analyzes (i) efficiency in fouling control or mitigation, (ii) advantages and drawbacks, (iii) technological performance, and (iv) challenges and knowledge gaps. Ultimately, the article provides a primary reference of algal biofouling in membrane-based applications.

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Section: Developments and Challenges Of Algal Fouling Controlmentioning

confidence: 99%

Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

2021

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“…Ultrafiltration (UF)-based membrane separations have been broadly employed in advanced drinking water treatments. − Nevertheless, the inevitable membrane fouling causes a decrease in the water permeance, reduces the membrane lifetime, and increases the operational cost, which limits the sustainable application of the UF membranes. − To alleviate membrane fouling, various strategies have been proposed, including regulating the water quality of the feed with pretreatments (i.e., coagulation, adsorption, and oxidation), optimizing the operating conditions, and antifouling modifications . The pretreatment strategies can efficiently reduce membrane fouling, while the operational costs are also increased due to the additional processes.…”

Section: Introductionmentioning

confidence: 99%

pH-Responsive Chitosan Sacrificial Layer for Simultaneous Enhancement of Ultrafiltration Performance and Sustainable Membrane Fouling Control

Zhou

Zhao

et al. 2023

ACS Appl. Polym. Mater.

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Membrane fouling is inevitable during ultrafiltration of natural surface waters. High-performance ultrafiltration membranes with sustainable antifouling abilities and regenerable properties are of great importance for water treatment. In this study, pH-responsive chitosan was used as a sacrificial and protective layer to enhance the ultrafiltration performance with a coating−decoating−recoating strategy. The resultant membranes were systematically characterized to determine the surface morphologies, separation, and antifouling capabilities. The results showed that the modified membranes exhibited enhanced hydrophilicity, reduced pore sizes, enhanced separation efficiencies, and improved antifouling behaviors at the expense of 3.4−18.8% reductions in the water fluxes. The atop chitosan layer served as the sacrificial layer for foulant deposition and protected the underlying support from fouling. Consequently, the fouled chitosan layer could be completely removed and regenerated by dissolution in an acid solution and recoated at the same time. During ultrafiltration of natural surface water, the flux recovery rate of the optimized membrane reached 95%, which was much higher than that of the control membrane (60.3%). The modified membranes exhibited excellent separation and antifouling capabilities in purifying real surface waters. Thus, the coating−decoating−recoating strategy is an economical and environmentally sound method for sustainable surface modifications of ultrafiltration membranes used to produce high-quality drinking water.

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“…In recent years, membrane technology has received more attention as a suitable alternative to conventional separation techniques for water/wastewater treatment applications. − Among pressure-driven membrane separation processes, the ultrafiltration (UF) process with higher water flux and lower energy consumption and cost than reverse osmosis (RO) and nanofiltration (NF) processes is a good candidate for water/wastewater treatment applications. − …”

Section: Introductionmentioning

confidence: 99%

Polyvinylidene Fluoride/Nanoclays (Cloisite 30B and Palygorskite) Mixed Matrix Membranes with Improved Performance and Antifouling Properties

Dehghankar

Mohammadi

Tavakolmoghadam

et al. 2021

Ind. Eng. Chem. Res.

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In this study, it was attempted to prove the effectiveness of nanoclays as economical and nontoxic nanofillers through comparison with carbon nanotubes (CNTs). Two hydrophilic nanoclays, namely, Cloisite 30B and palygorskite (PGS), were used as nanofillers to improve the morphology and performance of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes. A nonsolvent-induced phase separation (NIPS) method was used to prepare mixed matrix membranes (MMMs). The effects of the nanoclays on morphology, performance, and antifouling properties of the prepared MMMs were investigated. It was found that compared to PVDF membranes, the hydrophilicity, antifouling properties, and morphology of the fabricated MMMs are improved significantly. Compared to PVDF membranes, pure water flux (PWF) values of the MMMs containing the optimum contents of Cloisite 30B (0.5 wt %) and palygorskite (1 wt %) improved by 44.7 and 61.7%, respectively. Acid-treated CNTs were used as a reference additive, and the performance and antifouling properties of the prepared PVDF/nanoclay MMMs were compared with the prepared PVDF/acid-treated CNT MMMs. It was found that the PWF values of the MMM containing optimum contents of PGS and Cloisite 30B nanoclays are 86 and 77%, respectively, compared with that of the MMM containing acid-treated CNTs. The PVDF/Cloisite 30B MMM exhibited lower PWF than the PVDF/PGS MMM, which could be attributed to the plate-like structure of Cloisite 30B. Also, the flux recovery ratio (FRR) values of the mixed matrix membranes containing optimum contents of PGS and Cloisite 30B nanoclays were 95.65 and 92.06%, respectively, compared to that of the MMM containing acid-treated CNTs. Also, the BSA rejections of the prepared MMMs containing optimum contents of Cloisite 30B and palygorskite were comparable with that of the MMM containing acid-treated CNTs. Therefore, nanoclays can be suggested as economical and ecofriendly nanofillers for improving the PVDF membrane performance.

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Ferrous-activated sodium percarbonate pre-oxidation for membrane fouling control during ultrafiltration of algae-laden water

Cited by 45 publications

References 41 publications

Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

pH-Responsive Chitosan Sacrificial Layer for Simultaneous Enhancement of Ultrafiltration Performance and Sustainable Membrane Fouling Control

Polyvinylidene Fluoride/Nanoclays (Cloisite 30B and Palygorskite) Mixed Matrix Membranes with Improved Performance and Antifouling Properties

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