Degrémont launches compact hollow-fibre and flat-sheet membrane systems

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.

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Removal of antibiotics in sponge membrane bioreactors treating hospital wastewater: Comparison between hollow fiber and flat sheet membrane systems

Bioresource Technology ◽

10.1016/j.biortech.2017.02.118 ◽

2017 ◽

Vol 240 ◽

pp. 42-49 ◽

Cited By ~ 35

Author(s):

Thanh-Tin Nguyen ◽

Xuan-Thanh Bui ◽

Vinh-Phuc Luu ◽

Phuoc-Dan Nguyen ◽

Wenshan Guo ◽

...

Keyword(s):

Hollow Fiber ◽

Membrane Bioreactors ◽

Hospital Wastewater ◽

Membrane Systems ◽

Flat Sheet ◽

Flat Sheet Membrane ◽

Sheet Membrane

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An advanced simulation model for membrane bioreactors: development, calibration and validation

Water Science & Technology ◽

10.2166/wst.2012.249 ◽

2012 ◽

Vol 66 (7) ◽

pp. 1384-1391 ◽

Cited By ~ 4

Author(s):

T. Ludwig ◽

D. Gaida ◽

C. Keysers ◽

J. Pinnekamp ◽

M. Bongards ◽

...

Keyword(s):

Simulation Model ◽

Wastewater Treatment Plants ◽

Hollow Fibre ◽

Membrane Bioreactors ◽

Filtration Process ◽

Calibration And Validation ◽

Flat Sheet ◽

Dynamic Simulation Model ◽

Flat Sheet Membrane ◽

Sheet Membrane

Membrane wastewater treatment plants (WWTPs) have several advantages compared with conventionally designed WWTPs with classical purification techniques. The filtration process is the key to their commercial success in Germany with respect to energy consumption and effectiveness, enabled by the optimization of filtration using a dynamic simulation model. This work is focused on the development of a robust, flexible and practically applicable membrane simulation model for submerged hollow-fibre and flat-sheet membrane modules. The model is based on standard parameters usually measured on membrane WWTPs. The performance of the model is demonstrated by successful calibration and validation for three different full-scale membrane WWTPs achieving good results. Furthermore, the model is combinable with Activated Sludge Models.

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