Efficient oxygen supply and rapid biofilm formation by a new composite polystyrene elastomer membrane for use in a membrane-aerated biofilm reactor

Kobayashi, Masumi; Agari, Ryosei; Kigo, Yunje; Terada, Akihiko

doi:10.1016/j.bej.2022.108442

Cited by 13 publications

(2 citation statements)

References 39 publications

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“…Membrane materials used for MABR are categorized as microporous, composite, and dense membranes, of which microporous membranes are easy to assemble with low manufacturing costs. ,, However, the limited oxygen transfer, pore-clogging, and biofilm detachment issues make microporous membranes less suitable for large-scale applications. Previous studies have shown that enhancing the gas-permeability and bioaffinity of membranes improves the contaminant removal capacity of MABRs. ,− The 3,3-dihydroxyphenylalanine (DOPA) is a biomimetic mussel protein enriched in hydroxyl and amino groups with excellent adhesion properties and has been used to prepare multifunctional coatings. , Preparing composite membrane materials by coating DOPA or its derivatives on the surfaces of microporous membranes could promote biofilm formation and stabilization. , Multilayer composite membrane materials can be prepared by combining thin, dense layers with porous ones. However, the synthesis and control of biomimetic coatings still pose a significant challenge for the preparation of composite membranes.…”

Section: Introductionmentioning

confidence: 99%

Membrane Surface Woven Nylon Fillers Enhance Carbon and Nitrogen Removal of Membrane-Aerated Biofilm Reactor

Li,

Zheng,

Yan

et al. 2024

ACS EST Water

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The membrane-aerated biofilm reactor (MABR) is emerging as a promising solution for future wastewater treatment owing to its remarkable proficiency in achieving concurrent nitrogen and carbon removal. The research addressed a new type of MABR (R2) equipped with a polytetrafluoroethylene membrane-wrapped hollow nylon rope module that was constructed to improve the carbon and nitrogen removal of conventional MABR (R1). Uninterrupted operation lasting 120 days was conducted to compare the performance of R1 and R2 in treating simulated municipal wastewater with varying chemical oxygen demand (COD)/nitrogen (C/N) ratios. The results showed that R2 outperformed R1, exhibiting over 15.9% and 27.9% higher COD and TIN removal rates, respectively. The nylon fillers promoted biofilm formation, mitigated membrane pore clogging by the extracellular polymeric substances, and maintained a stable transmembrane pressure. R2 consistently maintained stable ammonia removal efficiency across different C/N ratios, while R1 exhibited a notable decrease at a high influent C/N ratio. Utilizing nylon carriers on membranes offered a cost-efficient and convenient method for modifying and preparing membranes for treating wastewater with broader C/N ratios and scaling up MABR applications.

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Section: Introductionmentioning

confidence: 99%

Membrane Surface Woven Nylon Fillers Enhance Carbon and Nitrogen Removal of Membrane-Aerated Biofilm Reactor

Li,

Zheng,

Yan

et al. 2024

ACS EST Water

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“…In this work, we propose a new kind of method to design a fully chemical DN hydrogel by introducing functional polystyrene (PS). To our knowledge, PS has long been used to process elastomers or textiles. − Wang has developed a novel nanoparticle-reinforced polyacrylamide-based hydrogel with high mechanical strength (compression strength and tensile strength up to 7.0 and 2.0 MPa), but it has an apparent shortcoming, that is, low stretchability . We have synthesized carboxyl-substituted polystyrene (CPS, 5762 Da) by employing the reversible addition–fragmentation chain transfer (RAFT) , polymerization method to synthesize the target polymer that possesses the carboxyl group at two termini (Scheme 1, Supporting Information).…”

Section: Introductionmentioning

confidence: 99%

Fast Recovery Double-Network Hydrogels Based on Particulate Macro-RAFT Agents

Wang,

Lei,

Zhu

et al. 2023

ACS Omega

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Synthetic hydrogels struggle to match the high strength, toughness, and recoverability of biological tissues under periodic mechanical loading. Although the hydrophobic polymer chain of polystyrene (PS) may initially collapse into a nanosphere upon contact with water, it has the ability to be elongated when it is subjected to an external force. To address this challenge, we employ the reversible addition−fragmentation chain transfer (RAFT) method to design a carboxylsubstituted polystyrene (CPS) which can form a covalently cross-linked network with four-armed amino-terminated polyethylene glycol (4-armed-PEG-NH 2 ), and a ductile polyacrylamide network is introduced in order to prepare a double-network (DN) hydrogel. Our results demonstrate that the DN hydrogel exhibits exceptional mechanical properties (0.62 kJ m −2 fracture energy, 2510.89 kJ m −3 toughness, 0.43 MPa strength, and 820% elongation) when a sufficient external force is applied to fracture it. Moreover, when the DN hydrogel is subjected to a 200% strain, it displays superior recoverability (94.5%). This holds a significant potential in enhancing the mechanical performance of synthetic hydrogels and can have wide-ranging applications in fields such as tissue engineering for hydrophobic polymers.

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‘Dark’ CO2 fixation in succinate fermentations enabled by direct CO2 delivery via hollow fiber membrane carbonation

Godar,

Chase,

Conway

et al. 2023

Bioprocess Biosyst Eng

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Efficient oxygen supply and rapid biofilm formation by a new composite polystyrene elastomer membrane for use in a membrane-aerated biofilm reactor

Cited by 13 publications

References 39 publications

Membrane Surface Woven Nylon Fillers Enhance Carbon and Nitrogen Removal of Membrane-Aerated Biofilm Reactor

Membrane Surface Woven Nylon Fillers Enhance Carbon and Nitrogen Removal of Membrane-Aerated Biofilm Reactor

Fast Recovery Double-Network Hydrogels Based on Particulate Macro-RAFT Agents

‘Dark’ CO2 fixation in succinate fermentations enabled by direct CO2 delivery via hollow fiber membrane carbonation

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