scholarly journals Chromium(VI) Removal by Polyvinyl Chloride (PVC)/Aliquat-336 Polymeric Inclusion Membranes in a Multiframe Flat Sheet Membrane Module

2019 ◽  
Vol 9 (15) ◽  
pp. 2994
Author(s):  
Hassina Semghouni ◽  
Said Bey ◽  
Alberto Figoli ◽  
Alessandra Criscuoli ◽  
Francesca Russo ◽  
...  
Keyword(s):  
Polyvinyl Chloride ◽  
Operating Conditions ◽  
Effect Of Temperature ◽  
Separation Performance ◽  
Aliquat 336 ◽  
Chromium Vi ◽  
Flat Sheet ◽  
Feed Phase ◽  
Flat Sheet Membrane ◽  
Sheet Membrane

A new multiframe flat sheet membrane contactor module containing several flat membranes was designed and implemented. Each frame contains a chamber (central hole) in which the feed and the receiving phases are put in contact with polyvinyl chloride (PVC)/Aliquat-336 polymeric flat sheet membranes for Cr(VI) removal from aqueous solutions (feed phase). To evaluate the efficiency of the system, the experimental design methodology was used to analyze the effect of temperature (T, °C), PVC/Aliquat-336 ratio, and Cr (VI) concentration in the feed phase and the concentration of sodium chloride (NaOH-NaCl) in the receiving phase. Two representative mathematical models of the two responses (extraction and back-extraction) were respectively obtained. A good correlation between the experimental results and those predicted (RS2 = 97.77 and RR2 = 97.87) was achieved, allowing the optimization of the different factors selected for each response, separately. The proposed system showed a good separation performance, leading to Cr(VI) extractions up to 93% when working at the optimized operating conditions.

Chromium (VI) removal by Aliquat-336 in a novel multiframe flat sheet membrane contactor

2020 ◽  
Vol 147 ◽  
pp. 107765 ◽  
Author(s):  
Hassina Semghouni ◽  
Said Bey ◽  
Aberto Figoli ◽  
Alessandra Criscuoli ◽  
Mohamed Benamor ◽  
...  
Keyword(s):  
Aliquat 336 ◽  
Membrane Contactor ◽  
Chromium Vi ◽  
Flat Sheet ◽  
Flat Sheet Membrane ◽  
Sheet Membrane

Performances and fouling control of a flat sheet membrane in a MBR pilot-plant

2010 ◽  
Vol 61 (9) ◽  
pp. 2185-2192 ◽  
Author(s):  
A. Grélot ◽  
P. Grelier ◽  
A. Tazi-Pain ◽  
B. Lesjean ◽  
U. Brüss ◽  
...  
Keyword(s):  
Pilot Plant ◽  
Membrane Surface ◽  
Membrane Technology ◽  
Operating Conditions ◽  
Mixed Liquor ◽  
Fouling Control ◽  
Biological Stress ◽  
Flat Sheet ◽  
Flat Sheet Membrane ◽  
Sheet Membrane

This paper deals with the performance and the optimisation of the hydraulic operating conditions of the A3 Water Solutions flat sheet membrane technology in a MBR pilot-plant to achieve a satisfying fouling control and also a reduction in the required aeration. Two vertically stacked modules were tested at pilot-scale at Anjou Recherche under typical biological operating conditions (mixed liquor suspended solids concentration (MLSS) = 10 g/l; sludge retention time (SRT) = 28 days; food to microorganism ratio (F/M)= 0.12 kg COD/kg MLSS/d). The use of a double-deck and of specific backwashes for this membrane technology enabled to achieve satisfying membrane performances for a net flux of 25 L h−1 m−2, 20°C at a low specific aeration demand per membrane surface (SADm = 0.2 Nm3 h−1 m−2) which corresponds to a specific aeration demand per permeate volume unit (SADp) of 8 Nm3 air/m3 permeate, which is lower than reported for many commercial membrane systems. The mixed liquor characteristics (foaming, MLSS concentration) appeared to influence the fouling behaviour of the membranes but no correlation was found with the fouling rate. However, with the new operating conditions, the system is robust and can cope with fouling resulting from biological stress and daily peak flows for MLSS concentrations in the membrane tank up to 18 g/l.

Blood compatibility of two different types of membrane oxygenator during cardiopulmonary bypass in infants

1994 ◽  
Vol 17 (10) ◽  
pp. 543-548 ◽  
Author(s):  
Y.J. Gu ◽  
P.W. Boonstra ◽  
C. Akkerman ◽  
H. Mungroop ◽  
I. Tigchelaar ◽  
...  
Keyword(s):  
Cardiopulmonary Bypass ◽  
Blood Compatibility ◽  
Hollow Fibre ◽  
Membrane Oxygenator ◽  
Hollow Fibre Membrane ◽  
Flat Sheet ◽  
Fibre Membrane ◽  
Membrane Oxygenators ◽  
Flat Sheet Membrane ◽  
Sheet Membrane

The contact of blood with the artificial extracorporeal circuit causes a systemic inflammatory response due to blood activation. In this study, we compared two different paediatric membrane oxygenators used for extracorporeal circulation: a hollow fibre membrane oxygenator (Dideco Masterflo D-701, n=10), and a flat sheet silicone membrane oxygenator (Avecor Kolobow 800-2A, n=10). Blood compatibility was indicated by measuring complement activation as well as leukocyte and platelet activation. In patients perfused with a flat sheet membrane oxygenator, concentrations of complement split products C3a were significantly increased 30 minutes after the start of bypass (p<0.01), whereas only a mild increase of C3a was found in patients perfused with a hollow fibre membrane oxygenator. Leukocyte and platelet counts dropped uniformly in both groups after the start of bypass mainly due to hemodilution. Activation of leukocytes and platelets identified by both plasma β-glucuronidase and β-thromboglobulin was similar in both groups. Infants perfused with a flat sheet membrane oxygenator received significantly more donor blood than those perfused with a hollow fibre oxygenator (p<0.05). These results indicate that when used during paediatric cardiopulmonary bypass, a flat sheet membrane oxygenator has a higher complement activity than a hollow fibre membrane oxygenator, which is probably due to the relatively larger blood-surface contacting area of the oxygenator.

Enzyme-immobilized flat-sheet membrane contactor for green carbon capture

2021 ◽  
pp. 129587
Author(s):  
Hannaneh Rasouli ◽  
Ion Iliuta ◽  
Francis Bougie ◽  
Alain Garnier ◽  
Maria C. Iliuta
Keyword(s):  
Carbon Capture ◽  
Membrane Contactor ◽  
Flat Sheet ◽  
Flat Sheet Membrane ◽  
Sheet Membrane
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