Chemically induced alteration in PAC characteristics and its influences on PAC/UF water treatment: Implications for on-line membrane cleaning with NaClO

Gao, Zeyuan; Zhao, Zhen; Cai, Weiwei

doi:10.1016/j.seppur.2022.121130

Cited by 10 publications

(4 citation statements)

References 68 publications

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“…A flat-sheet hydrophilic polyethersulfone (PES) membrane (Beijing Saipuruite, China) with a nominal molecular weight cut off (MWCO) of 50 kDa, mean pore size of 12.18 nm, and zeta potential of −3.06 mV (pH = 7.0) was used in the system. The zeta potential of membrane was measured at pH 7.0 by SurPASS (Anton Paar, Graz, Austria), which was consistent with our previous work [ 3 , 15 , 31 ]. Prior to use, the PES membrane was soaked in deionized water for 24 h. After pre-compaction by filtrating deionized water at 0.15 MPa and 25 ± 1 °C for 1 h, 1 L microbial suspension was introduced into the system by a pre-calibrated digital gear pump (Cole-Parmer, Chicago, IL, USA) at the recirculation superficial liquid velocity of 0.1 m/s.…”

Section: Methodssupporting

confidence: 88%

“…Since the purpose of this study was to explore and compare the microbial responses to various types of membrane cleaning, a typical and commonly used concentration was selected for each of the five chemical reagents according to the literature [ 10 , 12 , 15 , 26 , 27 ]. Specifically, 0.2 mol/L HCl or NaOH was used to adjust the pH of the E. coli suspension to 2.0 and 12.0, respectively; for CA, SDS, and NaClO, each reagent was directly added to the cell suspension separately until the final concentration reached 300 mg/L CA [ 10 , 26 ], 300 mg/L SDS [ 12 , 27 ], and 100 mg/L NaClO [ 15 ]. All these chemicals were purchased from Macklin Company.…”

Section: Methodsmentioning

confidence: 99%

“…During the on-line cleaning process, the membrane module remains in the reactor. The cleaning agent is injected into the membrane module through the permeation side, and chemically reacts with foulants on the membrane after passing through the membrane pores [ 15 , 16 ]. Afterwards, the residual effective chemical cleaning agent further diffuses into the entire reactor, thereby affecting the properties of microorganisms in the system.…”

Section: Introductionmentioning

confidence: 99%

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Microbial Responses to Various Types of Chemical Regents during On-Line Cleaning of UF Membranes

et al. 2022

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Ultrafiltration is widely used to treat various environmental waters, and on-line membrane cleaning with various chemical reagents is frequently employed to sustain the filtration flux. However, the residue of cleaning agents in the ultrafiltration system is unavoidable, which may affect microbiological properties and biofilm formation during the next-round filtration. By investigating the changes in microbial characteristics, and their biofouling behaviors after exposure to HCl, NaOH, NaClO, citric acid (CA), and sodium dodecyl sulfonate (SDS), this study fills a knowledge gap in microbial responses to various types of chemical cleaning agents in an ultrafiltration system. The result shows that HCl, NaOH, and NaClO affect the bacterial properties and subsequent attachment on the membrane surface, while CA and SDS have no obvious influence on microorganisms. Specifically, HCl, NaOH, and NaClO reduce the hydrophobicity and mean size of suspended microorganisms, increase the extracellular polymeric substances (EPS) release, and trigger intracellular reactive oxygen species (ROS) generation, resulting in the death of a large quantity of microorganisms. Due to the self-protecting strategy, plenty of living cells aggregate on the membrane surface and form a cake layer with a stratified structure, causing more severe membrane biofouling.

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Section: Methodssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microbial Responses to Various Types of Chemical Regents during On-Line Cleaning of UF Membranes

et al. 2022

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“…Additionally, the stability and reusability of CCuFeCM were evaluated through replication filtration cycles with membrane cleaning. Given the complexity of coexisting pollutants, the cleaning procedure was followed by sequential washing with ethanol, NaClO, NaOH, and pure water. − A similar smooth drop in the water flux was found in CCuFeCM for each cycle during complex emulsion filtration (Figure e). After three cycles, the flux of CCuFeCM decreased by ∼21% of the initial flux.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Ultrafiltration-Catalysis Ceramic Membrane for Enhanced Oily Wastewater Treatment: The Synergy Effect between High-Efficiency Catalysis and Separation

Liu,

Jiang,

Sun

et al. 2024

ACS EST Eng.

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Catalytic membranes that enable simultaneous micropollutant degradation during oil/water separation have emerged as a promising candidate for treating complex emulsified oily wastewater. However, this hybrid system suffers from membrane fouling and subsequent radical quenching. Herein, we overcome these challenges by developing a novel hierarchical filtration-catalysis ceramic membrane to achieve efficient gradient decontamination. This membrane comprises a top hydrophilic MWCNT layer deposited on a CuFe2O4-immobilized ceramic membrane to construct CCuFeCM. A pristine ceramic membrane (CM) and a CuFe2O4-immobilized membrane (CuFeCM) served as controls. Our results demonstrated that CCuFeCM presents the most alleviated fouling potential (∼18% of flux decline) and TOC removal (91%) when treating synthetic textile wastewater containing a mineral oil-in-water emulsion with RhB. Besides that, CCuFeCM achieves the highest PMS-based RhB degradation capability (100%) and initial reaction rate (0.684 min–1). Quenching experiments and EPR analyses show that SO4 –•, •OH, and 1O2 are responsible for the CCuFeCM/PMS oxidation system, and 1O2 is the dominant reactive species. The synergistic effect of oil separation and catalytic decomposition is mainly ascribed to the ordered arrangement of selective separation in advance to avoid interference with subsequent AOPs, which allows for micropollutants that are transmitted into internal membrane channels for confined catalytic oxidation. Furthermore, replication filtration tests indicate that CCuFeCM shows durable stable degradation and antifouling performance after simple cleaning. The specific functionality of oil isolation, catalyst anchor, and mass transfer effect reaction compartmentation provides a novel strategy for efficient gradient removal of multiple pollutants in water, which highlights promising application potential under realistic conditions.

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Evaluation of various factors influencing dynamic membrane formation and performance using metal oxide adsorbent

Kim,

Lee,

Kim

et al. 2024

Desalination

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Chemically induced alteration in PAC characteristics and its influences on PAC/UF water treatment: Implications for on-line membrane cleaning with NaClO

Cited by 10 publications

References 68 publications

Microbial Responses to Various Types of Chemical Regents during On-Line Cleaning of UF Membranes

Microbial Responses to Various Types of Chemical Regents during On-Line Cleaning of UF Membranes

Hierarchical Ultrafiltration-Catalysis Ceramic Membrane for Enhanced Oily Wastewater Treatment: The Synergy Effect between High-Efficiency Catalysis and Separation

Evaluation of various factors influencing dynamic membrane formation and performance using metal oxide adsorbent

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