Výsledky vyhledávání - "Michael J. Semmens"

Hydrodynamics and gas transfer performance of confined hollow fibre membrane modules with the aid of computational fluid dynamics

Autor: Eoin Syron, Eoin Casey, Michael J. Semmens, Fatemeh Kavousi

The use of gas permeable membranes for bubbleless aeration is of increasing interest due to the energy savings it affords in wastewater treatment applications. However, flow maldistributions are a major factor in the impedance of mass transfer effici

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6424367144e6d4cf154ef8b0d7143ecf

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Stimulating In Situ Hydrogenotrophic Denitrification with Membrane-Delivered Hydrogen under Passive and Pumped Groundwater Conditions

Autor: Michael J. Semmens, Mark A. Widdowson, Matthew Schnobrich, Brian P. Chaplin, Paige J. Novak

Publikováno v: Journal of Environmental Engineering. 135:666-676

A technology was developed to stimulate autotrophic biological denitrification by supplying hydrogen ( H2 ) to groundwater via gas-permeable membranes. The purpose of this project was to investigate this technology at field scale, determining whether

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bd649a4fa9bd08a2699f936fb51a986a
https://doi.org/10.1061/(asce)ee.1943-7870.0000021

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Alternative MBR configurations: using membranes for gas transfer

Autor: Michael J. Semmens

Publikováno v: Desalination. 231:236-242

This paper discusses the use of membranes for gas transfer in water and wastewater treatment. Typically, membrane bioreactors use microporous membranes to enhance treatment through improved solids separation. In a number of recent research studies, h

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ddd4020b28bc5d80d08899e15544aaa5
https://doi.org/10.1016/j.desal.2007.12.011

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Ammonium removal in advective-flow membrane-aerated biofilm reactors (AF-MABRs)

Autor: Michael J. Semmens, Timothy M. LaPara, Ali R. Ahmadi Motlagh

Publikováno v: Journal of Membrane Science. 319:76-81

A novel membrane-aerated biofilm reactor configuration was tested in which substrate was delivered to the biofilm via advective as well as diffusive transport. Ammonium-rich synthetic wastewater was pumped across a fabric of hollow-fiber membranes an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7af6420190367f461d02027348d6adcb
https://doi.org/10.1016/j.memsci.2008.03.020

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The effect of a non-woven scrim at the surface of a flat-sheet, microporous membrane on gas–liquid mass transfer

Autor: John W. Shanahan, Michael J. Semmens, José R. Álvarez

Publikováno v: Journal of Membrane Science. 318:435-440

Non-woven scrims can be attached to membranes to provide a protective support for biofilm development and discourage complete biofilm sloughing. This work characterizes the impact of a ∼400-μm thick, non-woven scrim at a membrane surface on gas–

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0c50c0498ad9e032d97027e7428269fa
https://doi.org/10.1016/j.memsci.2008.03.018

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The Impact of H2Addition on Dechlorinating Microbial Communities

Autor: X. Ma, Timothy M. LaPara, John A. Ferguson, Raymond M. Hozalski, Michael J. Sadowsky, Paige J. Novak, Michael J. Semmens

Publikováno v: Bioremediation Journal. 11:45-55

Laboratory-scale column experiments were performed to investigate the effects of membrane-supplied H2 on tetrachloroethene (PCE) dechlorination and microbial community composition. Columns were filled with aquifer material from one of two TCE-contami

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7285be156d98c93c27455447a1c43024
https://doi.org/10.1080/10889860701369490

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Stimulating hydrogenotrophic denitrification in simulated groundwater containing high dissolved oxygen and nitrate concentrations

Autor: Paige J. Novak, Matthew Schnobrich, Michael J. Semmens, Brian P. Chaplin

Publikováno v: Water Research. 41:1869-1876

In agricultural areas, nitrate (NO3-) is a common groundwater pollutant as a result of extensive fertilizer application. At elevated concentrations, NO3- consumption causes methemoglobinemia in infants and has been linked to several cancers; therefor

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7fbd1c8fcb79c14d65ad26d5c9923d50
https://doi.org/10.1016/j.watres.2007.01.044

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Biofilm Cohesiveness Measurement Using a Novel Atomic Force Microscopy Methodology

Autor: Greg Haugstad, Paige J. Novak, Michael J. Semmens, Francois Ahimou

Publikováno v: Applied and Environmental Microbiology. 73:2897-2904

Biofilms can be undesirable, as in those covering medical implants, and beneficial, such as when they are used for waste treatment. Because cohesive strength is a primary factor affecting the balance between growth and detachment, its quantification

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c413fb744ea8b533552a17d372b0376
https://doi.org/10.1128/aem.02388-06

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