Effects of a low-strength magnetic field on the characteristics of activated sludge for membrane fouling mitigation

Ren, Zhijun; Wang, Pengfei; Tian, Jiayu; Zhang, Zhiliu

doi:10.1039/c8ra10013f

Cited by 16 publications

(3 citation statements)

References 19 publications

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“…The positively charged PN neutralised the negatively charged cytomembrane (Liao et al 2001 ), enhancing the bacterial aggregation on the packing by reducing the repulsive Coulomb force between the bacterial cells (Zikmanis et al 2007 ). Furthermore, the increasing trend of DHA from 0.207 to 0.810 and 0.457 µmol·ml −1 ·h −1 on the surface of the MMPP and the MF-induced MPP, respectively, demonstrated the promotion of microbial activity under strengthening MFI (Ren et al 2019 ). Therefore, the CB removal performance was expected to increase with the promotion of the microbial CB affinity and activity.…”

Section: Resultsmentioning

confidence: 99%

Enhanced chlorobenzene removal by internal magnetic field through initial cell adhesion and biofilm formation

Chen,

Qiu,

Sun

et al. 2024

Appl Microbiol Biotechnol

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Magnetic fields (MF) have been proven efficient in bioaugmentation, and the internal MFs have become competitive because they require no configuration, despite their application in waste gas treatment remaining largely unexplored. In this study, we firstly developed an intensity-regulable bioaugmentation with internal MF for gaseous chlorobenzene (CB) treatment with modified packing in batch bioreactors, and the elimination capacity increased by up to 26%, surpassing that of the external MF. Additionally, the microbial affinity to CB and the packing surface was enhanced, which was correlated with the ninefold increased secreted ratio of proteins/polysaccharides, 43% promoted cell surface hydrophobicity, and half reduced zeta potential. Furthermore, the dehydrogenase content was promoted over 3 times, and CB removal steadily increased with the rising intensity indicating enhanced biofilm activity and reduced CB bioimpedance; this was further supported by kinetic analysis, which resulted in improved cell adhesive ability and biological utilisation of CB. The results introduced a novel concept of adjustable magnetic bioaugmentation and provided technical support for industrial waste gas treatments. Key points • Regulable magnetic bioaugmentation was developed to promote 26% chlorobenzene removal • Chlorobenzene mineralisation was enhanced under the magnetic field • Microbial adhesion was promoted through weakening repulsive forces Graphical abstract

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Section: Resultsmentioning

confidence: 99%

Enhanced chlorobenzene removal by internal magnetic field through initial cell adhesion and biofilm formation

Chen,

Qiu,

Sun

et al. 2024

Appl Microbiol Biotechnol

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“…Therefore, the development of innovative methods for controlling membrane surface structure and preparing self‐cleaning membranes would be highly valuable. [ 23,24 ] Self‐cleaning membranes responding to environmental stimuli such as magnetic fields, [ 25 ] temperature fluctuations, [ 26 ] and light [ 27,28 ] can cause changes in water flux and surface characteristics. Among the various stimulus‐responsive materials, photocatalytic materials have attracted considerable attention; [ 29–31 ] and TiO 2 is of particular interest because of its high catalytic activity, good chemical stability, low cost, and low toxicity.…”

Section: Methodsmentioning

confidence: 99%

Electrospinning Oriented Self‐Cleaning Porous Crosslinking Polymer for Efficient Dyes Removal

Chen

et al. 2020

Adv Materials Inter

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used to selectively separate molecules on the basis of their electrical properties or shapes. [8-10] The topological morphology of the interfacial polymerization substrate is very important for the construction of supramolecular crosslinking polymers. We believe that the combination of interfacial polymerization [11,12] and electrospinning technology [13] could be a good universal method for preparing composite nanofiltration membranes, the structures and properties of which can be controlled by means of surface modification, [14] adjustment of the electrospinning parameters, [15] and the addition of functional nanoparticles to the spinning solution. Membrane separation technology is now widely used in pollutant treatment. [16-18] However, contamination of porous membrane surfaces is a bottleneck that prevents even wider use of this technology. [19-22] After dye-containing wastewater is filtered, membranes are generally recycled by washing with organic solvents, but this process generates dye-containing organic solvent waste. If this new waste is not handled properly, the dissolved dyes can re-enter the environment and cause secondary pollution. Therefore, the development of innovative methods for controlling membrane surface structure and preparing self-cleaning membranes would be highly valuable. [23,24] Self-cleaning membranes responding to environmental stimuli such as magnetic fields, [25] temperature fluctuations, [26] and light [27,28] can cause changes in water flux and surface characteristics. Among the various stimulusresponsive materials, photocatalytic materials have attracted considerable attention; [29-31] and TiO 2 is of particular interest because of its high catalytic activity, good chemical stability, low cost, and low toxicity. [32,33] In the current study, we interfacially polymerized β-cyclodextrin and four crosslinking agents on polyacrylonitrile (PAN) electrospun nanofibrous substrates with different morphologies (depending on the PAN concentration and the spinning orientation), and we investigated the utility of the resulting composite membranes for dye removal from aqueous solution. If TiO 2 was incorporated in the PAN electrospun nanofibrous substrate, UV irradiation of the used composite membranes efficiently degraded the adsorbed dye, rendering the composite membranes self-cleaning and thus reusable (Scheme 1). First, electrospinning technology was used to fabricate nanofibrous PAN and PAN/TiO 2 membranes with controlled fiber diameter and morphology. Then, β-cyclodextrin and The separation of harmful substances by supramolecular crosslinking polymers is the focus of current research. As far as it is known, supramolecular crosslinking systems based on electrospun nanofibers are rarely reported. However, electrospun nanofibers should be promising candidates for interfacial crosslinking substrates because of their adjustable morphology and can be doped with different functional nanoparticles. In this study, β-cyclodextrin and acyl chloride compounds are interfacially polymerized on polya...

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“…It is a necessity to reduce its volume by improving the interior dewaterability performances. The common technique is to use commercial polyelectrolytes for sludge conditioning based on organic polymers to enhance the dewatering performance [4]. In this regard, numerous sludge-conditioning techniques have been applied according to the literature.…”

Section: Introductionmentioning

confidence: 99%

Dewatered Sludge Decorated with Nanoparticles for Alum Sludge Conditioning towards the Concept of “End-of-Waste”

Nabwey,

Tony

2023

Nanomaterials

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The circular economy concept is leading environmental engineering in the search for “End-of-Waste” criteria. Untreated waste residue results from drinking water treatment plants, causing severe environmental issues, and its reuse is essential. In this regard, this investigation introduces the beneficial reuses of alum sludge cake to close the loop between sludge waste generation and reuse. Considering alum sludge as a resource for dewatering instead of its categorization as a waste reflects an “End-of-Waste” approach. Alum sludge cake was thermally calcined at 400 °C and named thermally treated alum sludge cake (TAS-cake). In this study, TAS-cake decorated with magnetite with a percent weight of 5 to 1%, respectively, was labeled as TAS-cake@Fe-(5-1). X-ray diffraction (XRD) and morphologies were applied to characterize the hybrid composite. A Fenton-based hybrid composite was applied to extrude water from alum sludge for 7 min of conditioning time. Furthermore, the factorial design based on response surface methodology (RSM) was applied to optimize the operational variables. TAS-cake@Fe-(5-1) and hydrogen peroxide revealed 1.2 g/L and 740 mg/L doses at pH 3.0, showing pronounced performance and revealing the highest capillary suction time (CST) reduction, which reached 53%. A temperature increase also showed a pronounced enhancement effect on the sludge dewaterability that reached 72% when 55 °C was applied. Thus, such a novel conditioner is a promising candidate for alum sludge conditioning.

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Effects of a low-strength magnetic field on the characteristics of activated sludge for membrane fouling mitigation

Abstract: This study aims to investigate the performance of a low-strength magnetic field in membrane bioreactors (MBRs) for membrane fouling mitigation and its effects on sludge characteristics and microbial community.

Cited by 16 publications

References 19 publications

Enhanced chlorobenzene removal by internal magnetic field through initial cell adhesion and biofilm formation

Enhanced chlorobenzene removal by internal magnetic field through initial cell adhesion and biofilm formation

Electrospinning Oriented Self‐Cleaning Porous Crosslinking Polymer for Efficient Dyes Removal

Dewatered Sludge Decorated with Nanoparticles for Alum Sludge Conditioning towards the Concept of “End-of-Waste”

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