Cake formation of bidisperse suspensions in dead-end microfiltration

2019 ◽  
Vol 577 ◽  
pp. 31-40 ◽  
Author(s):  
Qi Han ◽  
Thien An Trinh ◽  
Jia Wei Chew
Keyword(s):  
Dead End ◽  
Cake Formation ◽  
Bidisperse Suspensions

Effect of coagulation mechanisms on the fouling and ultrasonic cleaning of PTFE membrane

2012 ◽  
Vol 66 (11) ◽  
pp. 2291-2298 ◽  
Author(s):  
Meng-Wei Wan ◽  
Cybelle Morales Futalan ◽  
Cheng-Hung Chang ◽  
Chi-Chuah Kan
Keyword(s):  
Membrane Fouling ◽  
Permeate Flux ◽  
Cleaning Efficiency ◽  
Ultrasonic Cleaning ◽  
Ptfe Membrane ◽  
Pore Blocking ◽  
Dead End ◽  
Flux Decline ◽  
Cake Formation ◽  
Scanning Electron

In this study, the effect of coagulation pretreatment on membrane fouling and ultrasonic cleaning efficiency was investigated using a dead-end polytetrafluoroethylene (PTFE) microfiltration system. The extent of membrane fouling was examined under different coagulation mechanisms such as charge neutralization (CN), electrostatic patch effect (EPE) and sweep flocculation (SW). Fouling through EPE mechanism provided the greatest flux decline and least permeate flux recovery over CN and SW. EPE produces more stable, smaller and more compact flocs while CN and SW have large, easily degraded and highly-branched structured flocs. The predominant fouling mechanism of EPE, CN and SW is pore blocking, a combination of pore blocking and cake formation, and cake formation, respectively. Better permeate flux recovery is observed with SW over CN and EPE, which implies formation of less dense and more porous cake deposits. The morphology of fouled membranes was examined using scanning electron microscopy (SEM).

Modelling of dead-end microfiltration with pore blocking and cake formation

2002 ◽  
Vol 208 (1-2) ◽  
pp. 181-192 ◽  
Author(s):  
S. Kosvintsev ◽  
R.G. Holdich ◽  
I.W. Cumming ◽  
V.M. Starov
Keyword(s):  
Pore Blocking ◽  
Dead End ◽  
Cake Formation

scholarly journals Interdependence of Contributing Factors Governing Dead-End Fouling of Nanofiltration Membranes

Membranes ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 47
Author(s):  
Oranso Themba Mahlangu ◽  
Bhekie Brilliance Mamba
Keyword(s):  
Membrane Surface ◽  
Contact Angles ◽  
Permeate Flux ◽  
Contributing Factors ◽  
Pore Blocking ◽  
Dead End ◽  
Flux Decline ◽  
Cake Formation ◽  
Affinity Interaction

Cake-enhanced concentration polarization (CECP) has been ascribed as the main cause of flux decline in dead-end filtration. An unfamiliar approach was used to investigate the role of CECP effects in the fouling of a nanofiltration membrane (NF-270) that poorly reject salts. Membrane–foulant affinity interaction energies were calculated from measured contact angles of foulants and membrane coupons based on the van der Waals/acid–base approach, and linked to resistance due to adsorption (Ra). In addition, other fouling mechanisms and resistance parameters were investigated using model organic and colloidal foulants. After selection, the foulants and membranes were characterized for various properties, and fouling experiments were conducted under controlled conditions. The fouled membranes were further characterized to gain more understanding of the fouling layer properties and flux decline mechanisms. Sodium alginate and latex greatly reduced membrane permeate flux as the flux declined by 86% and 59%, respectively, while there was minor flux decline when aluminum oxide was used as model foulant (<15% flux decline). More flux decline was noted when fouling was conducted with a combination of organic and colloidal foulants. Contrary to other studies, the addition of calcium did not seem to influence individual and combined fouling trends. Foulants adsorbed more on the membrane surface as the membrane–foulant affinity interactions became more attractive and pore blocking by the foulants was not important for these experiments. Hydraulic resistance due to cake formation (Rc) had a higher contributing effect on flux decline, while CECP effects were not substantial.

The Garden as Unfinished Narrative of the Good in C.S. Lewis’ Perelandra

2012 ◽  
Vol 2 (1) ◽  
pp. 49-80
Author(s):  
Evrea Ness-Bergstein
Keyword(s):  
The Novel ◽  
Garden Of Eden ◽  
Adam And Eve ◽  
Dead End ◽  
Growth And Change ◽  
Literary Devices ◽  
Hortus Conclusus

In Lewis’ transposition of Milton’s Paradise to a distant world where Adam and Eve do not succumb to Satan, the structure of Eden is radically different from the enclosed garden familiar to most readers. In the novel Perelandra (1944), C.S. Lewis represents the Garden of Eden as an open and ‘shifting’ place. The new Garden of Eden, with Adam and Eve unfallen, is a place of indeterminate future, excitement, growth, and change, very unlike the static, safe, enclosed Garden—the hortus conclusus of traditional iconography—from which humanity is not just expelled but also, in some sense, escapes. The innovation is not in the theological underpinnings that Lewis claims to share with Milton but in the literary devices that make evil in Perelandra seem boring, dead-end, and repetitive, while goodness is the clear source of change and excitement.

Derwent Moultrie Coleridge's Australian Exile

Romanticism ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 22-35
Author(s):  
Nicola Healey
Keyword(s):  
Nineteenth Century ◽  
Cambridge University ◽  
Dead End ◽  
Family Home

The literary career and troubled life of Derwent Moultrie Coleridge (1828–80), Derwent Coleridge's eldest son (S. T. Coleridge's first grandson) has been critically overlooked. After a period of alcohol-related, reckless behaviour at Cambridge University, he was exiled to Australia in November 1850, lest he continue to dishonour his father and the Coleridge name. Despite struggling considerably, he quickly became part of an Australian literary circle and he often contributed poems to Sydney newspapers. This essay analyses the most biographical of his poems that was published in the Australian press, ‘The Loafer's Christmas’ (1871) – a hitherto unknown poem – looking, in particular, at the dialogues in which the poem engages with his family, especially S. T. Coleridge's ‘The Rime of the Ancient Mariner’. I also contextualise ‘The Loafer's Christmas’ within nineteenth-century Australian culture. Looking at issues of exile, idleness, addiction, family, home(lessness), and religious redemption, this essay explores the ways in which Derwent Moultrie's exile proved to be both a literary liberation and a dead end, trapping him between times and spaces, real and imaginary. In so doing, I show how the lost life and writings of Derwent Moultrie Coleridge can offer us new perspectives on the Coleridge legacy.

Registration of animal rabies in Krasnodar region

2020 ◽  
pp. 3-4
Author(s):  
Oleg Yu. Chernykh ◽  
◽  
Vadim A. Bobrov ◽  
Sergey N. Zabashta ◽  
Roman A. Krivonos ◽  
...  
Keyword(s):  
Urban Form ◽  
Animal Species ◽  
Farm Animals ◽  
Natural Focus ◽  
Dead End ◽  
Wide Range ◽  
Epizootic Process ◽  
Krasnodar Region ◽  
Spread Of Infection ◽  
Reporting Data

Rabies remains a constant threat to humanity in many parts of the world. At the same time, scientifically grounded antiepizootic measures should be based on the peculiarities of the regional epizootology of this zooanthroponosis. The authors studied the epizootological and statistical reporting data of the Kropotkin Regional Veterinary Laboratory, presented an analysis of the registration of rabies in animals in Krasnodar region. From the obtained data, it should be noted that despite the wide range of animals involved in the epizootic process of rabies infection in Krasnodar region, dogs, cats and foxes play a major role in the reservation and spread of infection, which account for 78.6. Of the total number of registered cases, 15.5% falls on foxes, that indicates the natural focus of the disease, along with the manifestation of the disease in an urban form. At the same time, stray and neglected dogs and cats, which occupy a significant place among the total number of sick animals, are also sources and spread of the infection. Thus farm animals (8.3% of the total number of infected animals) are a biological dead end for the infection. Isolated cases of the disease were noted in muskrat, donkey, raccoon, raccoon dog, marten, ferret and jackal. The authors also established the specific morbidity of various animal species with rabies infection, that is an important aspect in the development and implementation of antiepizootic measures complex

: Last Chants for a Slow Dance (Dead End) . Jon Jost.

1979 ◽  
Vol 32 (3) ◽  
pp. 58-62
Author(s):  
David Coursen
Keyword(s):  
Dead End
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