Reversible and irreversible membrane fouling in hollow-fiber UF membranes filtering surface water: effects of ozone/powdered activated carbon treatment

Huang, Weiwei; Zhu, Yuanhong; Wang, Lin; Lv, Wenzhen; Dong, Bingzhi; Zhou, Wenzong

doi:10.1039/d0ra09820e

Cited by 19 publications

(11 citation statements)

References 40 publications

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“…The principle of this method to explore the SOC effect of perovskite has been fully discussed in previous publications. [43][44][45] Simply put, circularly polarized photoexcitation generates excitons with electrons of same-oriented orbital magnetic dipoles, providing strong magnetic dipole momenta through orbit-orbit interaction to create a photoinduced SOC. This photoinduced SOC can convert photogenerated excitons of a bright state into a dark state which is more difficult to recombine due to the spin selection rule.…”

Section: Resultsmentioning

confidence: 99%

High-performance flexible and self-powered perovskite photodetector enabled by interfacial strain engineering

et al. 2023

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Section: Resultsmentioning

confidence: 99%

High-performance flexible and self-powered perovskite photodetector enabled by interfacial strain engineering

et al. 2023

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“…Membrane fouling resistances were compared over the three phases to assess the differences in fouling control between the VCMBR and the ASCMBR. , Table shows that intrinsic membrane resistance ( R m ) in both MBRs were consistent at 2.60 ± 0.05 (×10 11 m –1 ) because an identical ceramic membrane module was used in each bioreactor. It is clear that the main fouling resistance in both MBRs was reversible fouling ( R r ), contributing to over 72.9% of the total membrane fouling resistance ( R t ) in all three phases as consistently reported in earlier studies. , …”

Section: Resultsmentioning

confidence: 99%

Vibrating MBR with Settling Zone for High-Flux Domestic Wastewater Treatment: Enhanced Nitrogen Removal and Fouling Mitigation

Wang

2022

ACS EST Water

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High-flux operation remains a major challenge in membrane bioreactor (MBR) applications due to membrane fouling. This study proposed an optimized hybrid vibrating ceramic MBR (VCMBR) with a settling zone (SZ) to achieve long-term high-flux (40 LMH) operation for domestic wastewater treatment compared to a conventional air-sparging ceramic MBR (ASCMBR). Results showed that the VCMBR could be operated at 40 LMH with excellent organics and ammonium removal and slowed membrane fouling for over 1 week without any backwash. The introduction of SZ into the VCMBR enhanced the average TN removal efficiencies up to 68.1%, which were much higher than 29.1% in the ASCMBR with SZ. Reversible and irreversible fouling were simultaneously reduced in the VCMBR due to significant reductions of the DOMs in the fouling layer. Importantly, membrane vibration without strongly scouring the biomass could reduce the extracellular polymeric substances (EPSs) release and restrict the fouling sources, leading to better fouling control. Additionally, SZ helped lower the biomass concentrations in the membrane separation area, inducing lower EPS concentrations and thus showing less fouling propensity in both MBRs. Overall, the synergetic effects on enhancing nitrogen removal and fouling mitigation by this energy-efficient VCMBR could potentially advance high-flux MBR technology for future decentralized wastewater treatment.

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“…Experimental characterizations, such as SEM (scanning electron microscopy), AFM, and water contact angle analysis, were carried out to compare the results with other pristine PVDF membranes, and it was observed that CND-blended membranes had larger surface pores, thus demonstrating higher water permeability and lesser roughness on the surface. Moreover, the irreversible fouling ratio to the total fouling ratio ( R ir / R t ) dropped from 85% for the pure PVDF membrane to 21% for the CND-blended membrane. , …”

Section: Physical and Chemical Characteristics Of Bioartificial Membr...mentioning

confidence: 97%

“…Moreover, the irreversible fouling ratio to the total fouling ratio (R ir /R t ) dropped from 85% for the pure PVDF membrane to 21% for the CNDblended membrane. 44,45 Many of these synthetic polymers are either avoided for use in biomedical applications or modified through biological/ chemical means to tailor their surfaces to be suitable for bioengineering applications. At the same time, natural polymers, although being promising for developing membranes for bioengineering, suffer from poor mechanical and manufacturing processability.…”

Section: Physical and Chemical Characteristics Of Bioartificial Membr...mentioning

confidence: 99%

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Surface Engineering of a Bioartificial Membrane for Its Application in Bioengineering Devices

et al. 2023

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Membrane technology is playing a crucial role in cutting-edge innovations in the biomedical field. One such innovation is the surface engineering of a membrane for enhanced longevity, efficient separation, and better throughput. Hence, surface engineering is widely used while developing membranes for its use in bioartificial organ development, separation processes, extracorporeal devices, etc. Chemical-based surface modifications are usually performed by functional group/biomolecule grafting, surface moiety modification, and altercation of hydrophilic and hydrophobic properties. Further, creation of micro/nanogrooves, pillars, channel networks, and other topologies is achieved to modify physio-mechanical processes. These surface modifications facilitate improved cellular attachment, directional migration, and communication among the neighboring cells and enhanced diffusional transport of nutrients, gases, and waste across the membrane. These modifications, apart from improving functional efficiency, also help in overcoming fouling issues, biofilm formation, and infection incidences. Multiple strategies are adopted, like lysozyme enzymatic action, topographical modifications, nanomaterial coating, and antibiotic/antibacterial agent doping in the membrane to counter the challenges of biofilm formation, fouling challenges, and microbial invasion. Therefore, in the current review, we have comprehensibly discussed different types of membranes, their fabrication and surface modifications, antifouling/ antibacterial strategies, and their applications in bioengineering. Thus, this review would benefit bioengineers and membrane scientists who aim to improve membranes for applications in tissue engineering, bioseparation, extra corporeal membrane devices, wound healing, and others.

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Reversible and irreversible membrane fouling in hollow-fiber UF membranes filtering surface water: effects of ozone/powdered activated carbon treatment

Abstract: This study investigated the reversible and irreversible membrane fouling behavior of micro polluted water by ozone/powdered activated carbon (PAC)/ultrafiltration treatment.

Cited by 19 publications

References 40 publications

High-performance flexible and self-powered perovskite photodetector enabled by interfacial strain engineering

High-performance flexible and self-powered perovskite photodetector enabled by interfacial strain engineering

Vibrating MBR with Settling Zone for High-Flux Domestic Wastewater Treatment: Enhanced Nitrogen Removal and Fouling Mitigation

Surface Engineering of a Bioartificial Membrane for Its Application in Bioengineering Devices

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