Elucidating the inherent fouling tolerance of membrane contactors for ammonia recovery from wastewater

Dutta, Abhishek; Kalam, Sifat; Lee, Jongho

doi:10.1016/j.memsci.2021.120197

Cited by 19 publications

(2 citation statements)

References 49 publications

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“…Recent studies on dissolved methane and ammonia recovery showed that an absence of transmembrane vapor flow leads to remarkably fouling-free membrane surfaces, as convective flows that carry foulants toward the feed–membrane interface are obviated (Figure ). , These observations render liquid–liquid MCs in an isothermal mode quite attractive in fouling control, at the cost of reduced flux compared to the non-isothermal mode. It should be noted that in the TOEC process, transmembrane water vapor flow is inevitable and desirable, like in the MD desalination process.…”

Section: Research Needsmentioning

confidence: 99%

Maximizing Biochemical and Energy Recovery from Wastewater Using Vapor-Gap Membranes

Kalam,

Dutta,

et al. 2024

ACS EST Eng.

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Carbon, nutrients, and heat are available in vast quantities in wastewater. However, technologies that can effectively extract chemicals and energy are needed to realize wastewater as a sustainable resource. Recent advances in wetting-resistant porous membranes, termed vapor-gap membranes (VGMs), have demonstrated that they are well-suited to the facile, selective, and cost-effective recovery of volatile resources and energy from wastewater. In this review, we examine the promise and limitations of VGM-based processes with a particular focus on two types of resources from wastewater: dissolved volatile compounds and low-grade heat. We begin by discussing the driving forces and selective mechanisms required for the extraction of different resources through VGMs. Then, the current status and challenges for the recovery of volatile compounds using VGMs are presented. We also analyze the resource potential of thermal energy in wastewater and its recovery using VGMs. Based on the membrane capabilities, process requirements, and resource availability, we assess the feasibility of wastewater valorization using VGMs and identify the research needs to achieve high recovery efficiency, long-term reliability, and scalability.

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Section: Research Needsmentioning

confidence: 99%

Maximizing Biochemical and Energy Recovery from Wastewater Using Vapor-Gap Membranes

Kalam,

Dutta,

et al. 2024

ACS EST Eng.

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“…Microbial contamination is also found on the membrane, such as bacteria. Fortunately, although the fouling layer has a high impact on the water vapor transfer, it has less impact on ammonia transfer [59]. However, the effect of contamination on ammonia separation performance still needs to be identified when using carbon nanotube composite ENMs.…”

Section: Ammonia-recovery Performancementioning

confidence: 99%

Enhancing the Ammonia Selectivity by Using Nanofiber PVDF Composite Membranes Fabricated with Functionalized Carbon Nanotubes

Xiao

et al. 2022

Membranes

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Conventional hydrophobic membrane-based membrane distillation (MD) has been applied for ammonia recovery from an anaerobic digestion (AD) effluent. However, the typical hydrophobic membranes do not have selectivity for ammonia and water vapor, which results in high energy consumption from the water evaporation. To enhance the selectivity during the ammonia recovery process, the functionalized carbon nanotubes (CNTs)/polyvinylidene fluoride (PVDF) nanofiber membranes were fabricated by electrospinning, and the effects of different CNTs and their contents on the performance of nanofiber membranes were investigated. The results indicate that CNTs can be successfully incorporated into nanofibers by electrospinning. The contact angles of the composite membrane are all higher than those of commercial membrane, and the highest value 138° can be obtained. Most importantly, under the condition of no pH adjustment, the ammonia nitrogen transfer coefficient reaches the maximum value of 3.41 × 10−6 m/s, which is about twice higher than that of commercial membranes. The ammonia separation factor of the carboxylated CNT (C-CNT) composite membrane is higher than that of the hydroxylated CNT(H-CNT) composite membrane. Compared with the application of the novel C-CNT composite membrane, the ammonia separation factor is 47% and 25% higher than that of commercial and neat PVDF membranes. This work gives a novel approach for enhancing ammonia and water selectivity during AD effluent treatment.

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Adsorption-based filtration membranes for wastewater treatment

Guan,

Zhang,

et al. 2023

Adsorption Through Advanced Nanoscale Materials

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Elucidating the inherent fouling tolerance of membrane contactors for ammonia recovery from wastewater

Cited by 19 publications

References 49 publications

Maximizing Biochemical and Energy Recovery from Wastewater Using Vapor-Gap Membranes

Maximizing Biochemical and Energy Recovery from Wastewater Using Vapor-Gap Membranes

Enhancing the Ammonia Selectivity by Using Nanofiber PVDF Composite Membranes Fabricated with Functionalized Carbon Nanotubes

Adsorption-based filtration membranes for wastewater treatment

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