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https://www.readbyqxmd.com/read/29921781/numerical-comparison-of-prediction-models-for-aerosol-filtration-efficiency-applied-on-a-hollow-fiber-membrane-pore-structure
#1
Pavel Bulejko
Hollow-fiber membranes (HFMs) have been widely applied to many liquid treatment applications such as wastewater treatment, membrane contactors/bioreactors and membrane distillation. Despite the fact that HFMs are widely used for gas separation from gas mixtures, their use for mechanical filtration of aerosols is very scarce. In this work, we compared mathematical models developed for the prediction of air filtration efficiency by applying them on the structural parameters of polypropylene HFMs. These membranes are characteristic of pore diameters of about 90 nm and have high solidity, thus providing high potential for nanoparticle removal from air...
June 19, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29291117/surface-modification-of-poly-vinylidene-fluoride-hollow-fibre-membranes-for-biogas-purification-in-a-gas-liquid-membrane-contactor-system
#2
Pengrui Jin, Chuan Huang, Jiaxiang Li, Yadong Shen, Liao Wang
The wetting of hollow fibre membranes decreases the performance of the liquid-gas membrane contactor for CO2 capture in biogas upgrading. To solve this problem, in this work, a poly(vinylidene fluoride) (PVDF) hollow fibre membrane for a liquid-gas membrane contactor was coated with a superhydrophobic layer composed of a combination of hydrophobic SiO2 nanoparticles and polydimethylsiloxane (PDMS) by the method of spray deposition. A rough layer of SiO2 deposited on the PVDF membrane resulted in an enhanced surface hydrophobicity...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29160687/janus-reactors-with-highly-efficient-enzymatic-co-2-nanocascade-at-air-liquid-interface
#3
Song Gao, Munirah Mohammad, Hao-Cheng Yang, Jia Xu, Kang Liang, Jingwei Hou, Vicki Chen
Though enzymatic cascade reactors have been the subject of intense research over the past few years, their application is still limited by the complicated fabrication protocols, unsatisfactory stability and lack of effective reactor designs. In addition, the spatial positioning of the cascade reactor has so far not been investigated, which is of significant importance for biphase catalytic reaction systems. Inspired by the Janus properties of the lipid cellular membrane, here we show a highly efficient Janus gas-liquid reactor for CO2 hydration and conversion...
December 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28953462/ozone-mass-transfer-behaviors-on-physical-and-chemical-absorption-for-hollow-fiber-membrane-contactors
#4
Yong Zhang, Kuiling Li, Jun Wang, Deyin Hou, Huijuan Liu
To understand the mass transfer behaviors in hollow fiber membrane contactors, ozone fluxes affected by various conditions and membranes were investigated. For physical absorption, mass transfer rate increased with liquid velocity and the ozone concentration in the gas. Gas flow rate was little affected when the velocity was larger than the critical value, which was 6.1 × 10-3 m/s in this study. For chemical absorption, the flux was determined by the reaction rate between ozone and the absorbent. Therefore, concentration, species, and pH affected the mass transfer process markedly...
September 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28152412/intensification-of-volatile-organic-compound-absorption-in-a-compact-wet-scrubber-at-co-current-flow
#5
Pierre-François Biard, Annabelle Couvert, Christophe Renner
Three volatile organic compounds (VOC) with no acidic or basic function (butanol, butyraldehyde, methylethylketone), encountered at low concentrations in odorous effluents, were absorbed in water in a compact wet scrubber. This gas-liquid contactor consisted of a wire mesh packing structure where the gas phase flows at high velocity (>12 m s-1 ). A very turbulent two-phase downward flow could be observed in the scrubber with dispersed fine droplets (around 10 μm). For compounds showing a good affinity for water, such as butanol, removal efficiencies up to 90% were measured for a short contactor length of 32 cm leading to a gas residence time of 20 ms...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28094159/performance-of-polydimethylsiloxane-membrane-contactor-process-for-selective-hydrogen-sulfide-removal-from-biogas
#6
Ebrahim Tilahun, Alper Bayrakdar, Erkan Sahinkaya, Bariş Çalli
H2S in biogas affects the co-generation performance adversely by corroding some critical components within the engine and it has to be removed in order to improve the biogas quality. This work presents the use of polydimethylsiloxane (PDMS) membrane contactor for selective removal of H2S from the biogas. Experiments were carried out to evaluate the effects of different pH of absorption liquid, biogas flowrate and temperature on the absorption performances. The results revealed that at the lowest loading rate (91mg H2S/m(2)·h) more than 98% H2S and 59% CO2 absorption efficiencies were achieved...
March 2017: Waste Management
https://www.readbyqxmd.com/read/27179177/designing-the-inner-surface-corrugations-of-hollow-fibers-to-enhance-co2-absorption-efficiency
#7
Hossein Fashandi, Mohammad Zarrebini, Ali Ghodsi, Reza Saghafi
For the first time, a low cost strategy is introduced to enhance the efficiency of CO2 absorption using gas-liquid membrane contactors. This is implemented by designing the corrugations in the inner layer of poly(vinyl chloride) hollow fibers (PVC HFs) through changing the bore fluid composition. In fact, the number of corrugations in the HF inner layer is engineered via changing the phase separation time within the inner layer. Such that expedited phase separation leads to highly corrugated inner layer. In contrast, decelerated phase separation is responsible for reduced number of inner layer corrugations...
August 15, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27120652/the-effect-of-microbubbles-on-gas-liquid-mass-transfer-coefficient-and-degradation-rate-of-cod-in-wastewater-treatment
#8
Kangning Yao, Yong Chi, Fei Wang, Jianhua Yan, Mingjiang Ni, Kefa Cen
A commonly used aeration device at present has the disadvantages of low mass transfer rate because the generated bubbles are several millimeters in diameter which are much bigger than microbubbles. Therefore, the effect of a microbubble on gas-liquid mass transfer and wastewater treatment process was investigated. To evaluate the effect of each bubble type, the volumetric mass transfer coefficients for microbubbles and conventional bubbles were determined. The volumetric mass transfer coefficient was 0.02905 s(-1) and 0...
2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/26322250/continuous-flow-metathesis-for-direct-valorization-of-food-waste-an-example-of-cocoa-butter-triglyceride
#9
Christiane Schotten, Dorota Plaza, Simone Manzini, Steven P Nolan, Steven V Ley, Duncan L Browne, Alexei Lapkin
The direct chemical conversion of cocoa butter triglycerides, a material available as a postmanufacture waste stream from the food industry, to 1-decene by way of ethenolysis is reported. The conversion of the raw waste material was made possible by use of 1 mol % of the [RuCl2(iBu-phoban)2(3-phenylindenyl)] catalyst. The process has been investigated in both batch and flow conditions, where the latter approach employs a Teflon AF-2400 tube-in-tube gas-liquid membrane contactor to deliver ethylene to the reaction system...
July 6, 2015: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/26293135/principle-and-performance-of-gas-self-inducing-reactors-and-applications-to-biotechnology
#10
Qin Ye, Zhimin Li, Hui Wu
Gas-liquid contacting is an important unit operation in chemical and biochemical processes, but the gas utilization efficiency is low in conventional gas-liquid contactors especially for sparingly soluble gases. The gas self-inducing impeller is able to recycle gas in the headspace of a reactor to the liquid without utilization of additional equipment such as a gas compressor, and thus, the gas utilization efficiency is significantly enhanced. Gas induction is caused by the low pressure or deep vortex at a sufficiently high impeller speed, and the speed at which gas induction starts is termed the critical speed...
2016: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/25984966/surface-engineering-of-polypropylene-membranes-with-carbonic-anhydrase-loaded-mesoporous-silica-nanoparticles-for-improved-carbon-dioxide-hydration
#11
Joel K J Yong, Jiwei Cui, Kwun Lun Cho, Geoff W Stevens, Frank Caruso, Sandra E Kentish
Carbonic anhydrase (CA) is a native enzyme that facilitates the hydration of carbon dioxide into bicarbonate ions. This study reports the fabrication of thin films of active CA enzyme onto a porous membrane substrate using layer-by-layer (LbL) assembly. Deposition of multilayer films consisting of polyelectrolytes and CA was monitored by quartz crystal microgravimetry, while the enzymatic activity was assayed according to the rates of p-nitrophenylacetate (p-NPA) hydrolysis and CO2 hydration. The fabrication of the films onto a nonporous glass substrate showed CO2 hydration rates of 0...
June 9, 2015: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/25590169/innovative-use-of-membrane-contactor-as-condenser-for-heat-recovery-in-carbon-capture
#12
Shuiping Yan, Shuaifei Zhao, Leigh Wardhaugh, Paul H M Feron
The gas-liquid membrane contactor generally used as a nonselective gas absorption enhancement device is innovatively proposed as a condenser for heat recovery in liquid-absorbent-based carbon capture. The membrane condenser is used as a heat exchanger to recover the latent heat of the exiting vapor from the desorber, and it can help achieve significant energy savings when proper membranes with high heat-transfer coefficients are used. Theoretical thermodynamic analysis of mass and heat transfer in the membrane condensation system shows that heat recovery increases dramatically as inlet gas temperature rises and outlet gas temperature falls...
February 17, 2015: Environmental Science & Technology
https://www.readbyqxmd.com/read/25463780/an-innovative-membrane-bioreactor-for-methane-biohydroxylation
#13
N Pen, L Soussan, M-P Belleville, J Sanchez, C Charmette, D Paolucci-Jeanjean
In this study, a membrane bioreactor (MBR) was developed for efficient, safe microbial methane hydroxylation with Methylosinus trichosporium OB3b. This innovative MBR, which couples a bioreactor with two gas/liquid macroporous membrane contactors supplying the two gaseous substrates (methane and oxygen) was operated in fed-batch mode. The feasibility and the reproducibility of this new biohydroxylation process were first demonstrated. The mass transfer within this MBR was twice that observed in a batch reactor in similar conditions...
December 2014: Bioresource Technology
https://www.readbyqxmd.com/read/24223420/stripping-of-acetone-from-water-with-microfabricated-and-membrane-gas-liquid-contactors
#14
Achilleas Constantinou, Francesco Ghiotto, Koon Fung Lam, Asterios Gavriilidis
Stripping of acetone from water utilizing nitrogen as a sweeping gas in co-current flow was conducted in a microfabricated glass/silicon gas-liquid contactor. The chip consisted of a microchannel divided into a gas and a liquid chamber by 10 μm diameter micropillars located next to one of the channel walls. The channel length was 35 mm, the channel width was 220 μm and the microchannel depth 100 μm. The micropillars were wetted by the water/acetone solution and formed a 15 μm liquid film between them and the nearest channel wall, leaving a 195 μm gap for gas flow...
January 7, 2014: Analyst
https://www.readbyqxmd.com/read/24194500/polyvinylidene-fluoride-siloxane-nanofibrous-membranes-for-long-term-continuous-co2-capture-with-large-absorption-flux-enhancement
#15
Yi-Feng Lin, Chi-Sen Wang, Chia-Chieh Ko, Chien-Hua Chen, Kai-Shiun Chang, Kuo-Lun Tung, Kueir-Rarn Lee
In a CO2 membrane contactor system, CO2 passes through a hydrophobic porous membrane in the gas phase to contact the amine absorbent in the liquid phase. Consequently, additional CO2 gas is absorbed by amine absorbents. This study examines highly porous polyvinylidene fluoride (PVDF)/siloxane nanofibrous layers that are modified with hydrophobic fluoroalkylsilane (FAS) functional groups and successfully coated onto a macroporous Al2 O3 membrane. The performance of these materials in a membrane contactor system for CO2 absorption is also investigated...
February 2014: ChemSusChem
https://www.readbyqxmd.com/read/23897976/extraction-and-quantification-of-so2-content-in-wines-using-a-hollow-fiber-contactor
#16
Andrea Plaza, Julio Romero, Wladimir Silva, Elizabeth Morales, Alejandra Torres, María J Aguirre
Sulfites [Formula: see text] or sulfur dioxide (SO2) is a preservative widely used in fruits and fruit-derived products. This study aims to propose a membrane contactor process for the selective removal and recovery of SO2 from wines in order to obtain its reliable quantification. Currently, the aspiration and Ripper methods offer a difficult quantification of the sulfite content in red wines because they involve evaporation steps of diluted compounds and a colorimetric assay, respectively. Therefore, an inexpensive and accurate methodology is not currently available for continuous monitoring of SO2 in the liquids food industry...
October 2014: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/23811379/analysis-of-ammonia-separation-from-purge-gases-in-microporous-hollow-fiber-membrane-contactors
#17
M R Karami, P Keshavarz, M Khorram, M Mehdipour
In this study, a mathematical model was developed to analyze the separation of ammonia from the purge gas of ammonia plants using microporous hollow fiber membrane contactors. A numerical procedure was proposed to solve the simultaneous linear and non linear partial differential equations in the liquid, membrane and gas phases for non-wetted or partially wetted conditions. An equation of state was applied in the model instead of Henry's law because of high solubility of ammonia in water. The experimental data of CO₂-water system in the literature was used to validate the model due to the lack of data for ammonia-water system...
September 15, 2013: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/23726705/quantifying-the-loss-of-methane-through-secondary-gas-mass-transport-or-slip-from-a-micro-porous-membrane-contactor-applied-to-biogas-upgrading
#18
Andrew McLeod, Bruce Jefferson, Ewan J McAdam
Secondary gas transport during the separation of a binary gas with a micro-porous hollow fibre membrane contactor (HMFC) has been studied for biogas upgrading. In this application, the loss or 'slip' of the secondary gas (methane) during separation is a known concern, specifically since methane possesses the intrinsic calorific value. Deionised (DI) water was initially used as the physical solvent. Under these conditions, carbon dioxide (CO2) and methane (CH4) absorption were dependent upon liquid velocity (V(L))...
July 1, 2013: Water Research
https://www.readbyqxmd.com/read/23474409/effect-of-polymer-concentration-on-the-structure-and-performance-of-pei-hollow-fiber-membrane-contactor-for-co2-stripping
#19
R Naim, A F Ismail
A series of polyetherimide (PEI) hollow fiber membranes with various polymer concentrations (13-16 wt.%) for CO2 stripping process in membrane contactor application was fabricated via wet phase inversion method. The PEI membranes were characterized in terms of liquid entry pressure, contact angle, gas permeation and morphology analysis. CO2 stripping performance was investigated via membrane contactor system in a stainless steel module with aqueous diethanolamine as liquid absorbent. The hollow fiber membranes showed decreasing patterns in gas permeation, contact angle, mean pore size and effective surface porosity with increasing polymer concentration...
April 15, 2013: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/23106335/adsorption-of-n-nitrosodimethylamine-precursors-by-powdered-and-granular-activated-carbon
#20
David Hanigan, Jinwei Zhang, Pierre Herckes, Stuart W Krasner, Chao Chen, Paul Westerhoff
Activated carbon (AC) has been shown to remove precursors of halogenated disinfection byproducts. Granular and powdered activated carbon (GAC, PAC) were investigated for their potential to adsorb N-nitrosodimethylamine (NDMA) precursors from blends of river water and effluent from a wastewater treatment plant (WWTP). At bench scale, waters were exposed to lignite or bituminous AC, either as PAC in bottle point experiments or as GAC in rapid small-scale column tests (RSSCTs). NDMA formation potential (FP) was used as a surrogate for precursor removal...
November 20, 2012: Environmental Science & Technology
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