Influence of polyelectrolyte architecture on the electrokinetics and dewaterability of industrial membrane bioreactor activated sludge

Yousefi, Shiva; Nasser, Mustafa S.; Hussein, Ibnelwaleed A.; Judd, Simon

doi:10.1016/j.jenvman.2018.12.067

Cited by 10 publications

(2 citation statements)

References 30 publications

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“…In contrast, the larger sizes created by the long chains gave access to faster sedimentation rates under intense mixing. Yousefi et al studied the influence of the type and structure of polyelectrolytes on the rheological [ 7 ], electrokinetic, and dewatering characteristics [ 8 ] of industrial sludges from a highly stable membrane bioreactor (MBR). Several similar studies have analyzed the effect of PAM-based polymer properties on particle flocculation under conditions of relevance to the oil industry, wastewater treatment, and papermaking [ 9 , 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Study of the Conformation, Ion Adsorption, Diffusion, and Water Structure of Soluble Polymers in Saline Solutions

et al. 2021

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Polymers have interesting physicochemical characteristics such as charge density, functionalities, and molecular weight. Such attributes are of great importance for use in industrial purposes. Understanding how these characteristics are affected is still complex, but with the help of molecular dynamics (MD) and quantum calculations (QM), it is possible to understand the behavior of polymers at the molecular level with great consistency. This study was applied to polymers derived from polyacrylamide (PAM) due to its great use in various industries. The polymers studied include hydrolyzed polyacrylamide (HPAM), poly (2-acrylamido-2-methylpropanesulfonate) (PAMPS), polyacrylic acid (PAA), polyethylene oxide polymer (PEO), and guar gum polysaccharide (GUAR). Each one has different attributes, which help in understanding the effects on the polymer and the medium in which it is applied along a broad spectrum. The results include the conformation, diffusion, ion condensation, the structure of the water around the polymer, and interatomic polymer interactions. Such characteristics are important to selecting a polymer depending on the environment in which it is found and its purpose. The effect caused by salinity is particular to each polymer, where polymers with an explicit charge or polyelectrolytes are more susceptible to changes due to salinity, increasing their coiling and reducing their mobility in solution. This naturally reduces its ability to form polymeric bridges due to having a polymer with a smaller gyration radius. In contrast, neutral polymers are less affected in their structure, making them favorable in media with high ionic charges.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Study of the Conformation, Ion Adsorption, Diffusion, and Water Structure of Soluble Polymers in Saline Solutions

et al. 2021

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“…Many wastewater treatment plants either domestic or industrial from various industries practice this treatment method (Yang et al., 2020). Undeniably, wastewater treatment plant with activated sludge shows good removal of pollutants (Yousefi et al., 2019; Zaidi, Sohaili et al., 2020). Activated sludge consists of two stages, namely, biological degradation and physical stage which take place in aeration tank and secondary clarifier, respectively (Kumar et al., 2021; Maltos et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Improvement of biomass aggregation in sludge bulking by magnetic field application

Zaidi

Zhan

Bahrodin

et al. 2022

Environmental Quality Mgmt

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High biomass aggregation is commonly associated with good solid–liquid separation that can inhibit the occurrence of sludge bulking. The application of magnetic fields in the removal of pollutants has been studied previously but the relation between a magnetic field with biomass aggregation and its effect on pollutant removal efficiency receives very little attention. This present study was conducted to analyze the effect of the magnetic field toward biomass aggregation that can eventually contribute to the good removal performance of the pollutants. Two continuous laboratory‐scale sequencing batch reactors known as Reactor A and Reactor B were set up. Reactor A was equipped with an 88 mT magnetic field while Reactor B acted as the control. Reactor A recorded higher biomass aggregation with the range of 75.0–95.2% compared to Reactor B which possessed mostly medium aggregation with an average of 65.5%. As a result, lower sludge volume index (SVI) was recorded in Reactor A (25.8 ml/g) compared to Reactor B (73.1 ml/g). Likewise, Reactor A showed significantly higher chemical oxygen demand (COD) and ammonia‐nitrogen removal compared to Reactor B. These findings imply that the magnetic field successfully improves biomass aggregation, therefore improving the removal performance under the sludge bulking occurrence.

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Removal behaviors and fouling mechanisms of charged antibiotics and nanoparticles on forward osmosis membrane

Jeong

Kim

et al. 2019

Journal of Environmental Management

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Forward osmosis (FO) process was operated with a feed solution (FS) containing charged antibiotics (ABs) and nanoparticles (NPs). The fouling and rejection mechanisms of both charged ABs and NPs were determined experimentally using a negatively-charged polyamide thin film composite FO flat sheet membranes. Two types of ABs and NPs were selected as positively and negatively charged foulants at pH 8. The ABs did not cause significant membrane fouling, but the extent of fouling and rejection changed based on the electrostatic attraction or repulsion forces. The occurrence of electrostatic attraction upon addition of oppositely charged ABs and NPs resulted in membrane flux decline and improvement in rejection efficiency of ABs. On the other hand, mixing of like-charged ABs and NPs generated repulsive forces that improved rejection efficiency but made no changes to the membrane flux. Additionally, NPs and ABs were mixed and tested at various concentrations and pH levels to rectify the behavior of ABs. The aggregate size and removal efficiency was observed to vary with the change in the electron double layer of the mixture. The results obtained from this study can provide useful insights for developing strategies to treat or control ABs or charged foulants in the FO process.

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Influence of polyelectrolyte architecture on the electrokinetics and dewaterability of industrial membrane bioreactor activated sludge

Cited by 10 publications

References 30 publications

Molecular Dynamics Study of the Conformation, Ion Adsorption, Diffusion, and Water Structure of Soluble Polymers in Saline Solutions

Molecular Dynamics Study of the Conformation, Ion Adsorption, Diffusion, and Water Structure of Soluble Polymers in Saline Solutions

Improvement of biomass aggregation in sludge bulking by magnetic field application

Removal behaviors and fouling mechanisms of charged antibiotics and nanoparticles on forward osmosis membrane

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