Molecular Scale Modeling of Membrane Water Treatment Processes

Ridgway, Harry F.; Gale, Julian D.; Hughes, Zak E.; Stewart, Matthew B.; Orbell, John D.; Gray, Stephen

doi:10.1002/9783527668502.ch10

Cited by 8 publications

(9 citation statements)

References 136 publications

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“…While there is no agreement in the peer-reviewed literature on whether the globular features in TEM images discussed here are voids or dense nodules [21], the features are significantly lighter in shade than the rest of the active layer when bright-field imaging is used [14][15][16][17][18][19][20], indicating that they have a lower electron density than the surrounding polymer. Therefore, these features are likely voids, instead of dense nodules, or correspond to regions of significantly lower polymer density.…”

Section: Introductionmentioning

confidence: 93%

“…Existing analytical, numerical and atomistic approaches for modeling the transport of water and solutes through RO/NF membranes [9,10,21,44,[53][54][55][56][57][58][59][60] and active layer formation [21,44,[54][55][56] do not take into account the existence of voids. Therefore, future transport modeling efforts should evaluate the importance of the presence of voids in active layers (e.g., water/ solute partitioning events at polyamide-water interfaces at the voids walls, non-constant water/solute diffusion coefficients in the active layer), and active layer formation modeling efforts should target a more accurate active layer structure that includes the voids.…”

Section: Broad Implications On Ro/nf Science and Technologymentioning

confidence: 99%

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Investigating the void structure of the polyamide active layers of thin-film composite membranes

Lin

López

Ramon

et al. 2016

Journal of Membrane Science

193

151

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Section: Introductionmentioning

confidence: 93%

Section: Broad Implications On Ro/nf Science and Technologymentioning

confidence: 99%

Investigating the void structure of the polyamide active layers of thin-film composite membranes

Lin

López

Ramon

et al. 2016

Journal of Membrane Science

193

151

View full text Add to dashboard Cite

“…The reverse osmosis and high-pressure nanofiltration membranes were popularly used for the treatment of water and desalination. The treatment process through these membrane systems was based on the solute transport by diffusion through the nonporous active layer of the membrane [14]. In this section, we outline some recent literatures on water filtration membranes used for the removal of viruses including SARS-CoV-2 from wastewater treatment plants.…”

Section: Membranes For Virus Removalmentioning

confidence: 99%

Modeling on Wastewater Treatment Process in Saudi Arabia: a perspective of Covid-19

Mutum

Ahmadini

Hussein

et al. 2021

Preprint

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The novel coronavirus diseases (COVID-19) has resulted in an ongoing pandemic affecting the health system and devastating impact on global economy. The virus has been found in human feces, in sewage and in wastewater treatment plants. We highlight the transmission behavior, occurrence, and persistence of coronavirus in sewage and wastewater treatment plants. Our approach is to follow in the process of identifying a coronavirus hotspot through existing wastewater plants in major cities of Saudi Arabia. The mathematical distributions including log-normal distribution, Gaussian model and susceptible-exposed-infection-recovered-(SEIR) model are adopted to predict the coronavirus load in wastewater plants. This paper highlights not only the potential virus removal techniques from wastewater treatment plants but also to facilitate tracing of SARS-CoV-2 virus in human through wastewater treatment plants.

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“…Although several past experimental , and theoretical − studies attempted to elucidate the rejection mechanisms of organics through RO, complex heterogeneous RO membrane properties − and the interacting thermodynamic and kinetic contributions to the rejection mechanism have limited the ability to quantitatively predict those rejection efficiencies. The rejection of organics by nonporous dense RO membranes is explained by two major factors whose independent measurements are technically challenging: (1) solute–membrane interactions (i.e., thermodynamic properties) and (2) the diffusion of organic through the membrane active layer (i.e., kinetics properties) .…”

Section: Introductionmentioning

confidence: 99%

Group Contribution Method to Predict the Mass Transfer Coefficients of Organics through Various RO Membranes

Kibler

Mohrhardt

Zhang

et al. 2020

Environ. Sci. Technol.

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Reverse osmosis (RO) is a membrane technology that separates dissolved species from water. RO has been applied for the removal of chemical contaminants from water for potable reuse applications. The presence of a wide variety of influent chemical contaminants and the insufficient rejection of low-molecular-weight neutral organics by RO calls for the need to develop a model that predicts the rejection of various organics. In this study, we develop a group contribution method (GCM) to predict the mass transfer coefficients by fragmenting the structure of low-molecular-weight neutral organics into small parts that interact with the RO membrane. Overall, 54 organics including 26 halogenated and oxygenated alkanes, 8 alkenes, and 20 alkyl and halobenzenes were used to determine 39 parameters to calibrate for 6 different RO membranes, including 4 brackish water and 2 seawater membranes. Through six membranes, approximately 80% of calculated rejection was within an error goal (i.e., ±5%) from the experimental observation. To extend the GCM for a reference RO membrane, ESPA2-LD, 14 additional organics were included from the literature to calibrate nitrogen-containing functional groups of nitrosamine, nitriles, and amide compounds. Overall, 49 organics (72% of 68 compounds) from calibration and 7 compounds (87.5% of 8 compounds) from prediction were within the error goal.

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Molecular Scale Modeling of Membrane Water Treatment Processes

Cited by 8 publications

References 136 publications

Investigating the void structure of the polyamide active layers of thin-film composite membranes

Investigating the void structure of the polyamide active layers of thin-film composite membranes

Modeling on Wastewater Treatment Process in Saudi Arabia: a perspective of Covid-19

Group Contribution Method to Predict the Mass Transfer Coefficients of Organics through Various RO Membranes

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