Dual-layer hollow membrane

30 #

m

B~ E

25

d

20

t-

Influent NH4-N

l - - Effluent NH4-N

O

(O

E :D

15

E

10

E E

5

o

<

I

0

I

0

10

20

3O

40

I

50

60

Time (days)

International Conference on Advanced ~vV~astewaterTreatment Processes, University of Leeds, UK, 1997. 7. Abdel-Warith, A.S., Williamson, K.J., and Strand, S.E.: "Substratum aerated bio-fihn reactor". ASCE National Conference on Environmental Engineering, New York, NY, USA, 1990, 360-365. 8. Characklis, W.G.: "Dynamic~ of bio-fihn process", Biotechnol. & Bioeng., 23, 1981, 1923. 9. Characklis, W.G., Trulear, M.G., Bryers, J. D., Zelver, N.: "Dynamics of bio-fitm processes: Methods", Water Res., 16, 1982, 1207-1216. 10. Characklis, W.G. and Marshall, K.C.: "Biofilms" (Wiley, New York, 1990). 11. Cote, EL, Bersillon, J.L., Huyard, A., and

Patents Composite materials for membrane reactors Appficant: Amoco Corporation, USA This invention relates to composite materials for membrane reactors which include a gas-tight ceramic, a porous support, and an interracial zone which exists between them. In particular, this invention covers composite materials which use oxygen ion-conducting dense ceramic membranes that are formed on a porous support. The support comprises a metallic alloy which provides an interracial zone which is identifiable by a gradient of composition in at least one metallic element across the interracial zone between the dense ceramic membrane and the porous support. Processes which use composite materials in accordance with the invention are, for example, used to produce synthesis gas, comprising carbon monoxide and

Membrane Technology No. 111

Haup, J.M.: "Bubble-free aeration using membranes: Process analysis", J. Water PolluHon Control Federation, 60(11), 1988, 1986-1992. 12. Cote, EL, Bersillon, J.L., and Huyard, A.: "Bubble-free aeration using membranes: Mass transfer analysis", J. of Membrane Science, 47(1/2), 1989, 91-106. 13. Essila, N.J.: "Contrasting behavior of biofilms grown on gas permeable membranes with those grown on solid surfaces: Model study). Masters thesis, University of Minnesota, 1997. 14. Hirasa, O., lchijo, H., and Yamauchi, A.: "Preparation of new support for immobilization of activated sludge", J. oF Fermentation & Bioengineering, 71 (5), 1991,376-378. 15. Lazarova, V. and Manem, J.: "Review

molecular hydrogen, which is free of deleterious and/or inert gaseous diluents such as nitrogen. Patent number: WO 99/21640 Inventors: M.S. Kleefisch, C.A. Udovich, J.G. Masin, T.P. Kobylinski Publica6on date: 6 May 1999

Dual-layer hollow membrane Applicant: Commissariat fi l'Energie Atomique, France; N. Jitariouk (France) This invention concerns a hollow membrane that conrprises two support-layers arranged one above the other, providing between them a plurality of capillary tubes. These are arranged between the support-layers, and form capillary channels through which a first liquid is able to flow. The space between the capillary tubes forms an internal cavity for a second liquid to circulate around the capillary rubes. The whole assembly is made from an organic polymer. The membranes can be assembled into modules with porous intermediate plates for treating fluids. Patent number: WO 99/21643

paper", Water Res., 29(10), 1995, 2227-2245. 16. Metcalf & Eddy Inc.: "Wastewatgr engineering, treatment, disposal and reuse" (McGraw Hill, New York, 3rd edn., 1991). 17. Pavasant, P., Pistikopoulos, E.N., and Livingston, A.G.: "Prediction of axial concentration profles in an extractive membrane bioreactor and experimental verification", J. or" Membrane Science, 130, 1997, 85-98. 18. Peys, K., Diels, L., Leysen, R., and Vandecasteele, L.: "Development of a membrane bio-film reactor for the degradation of chlorinated aromatics", Water Sci. & Technol., 36(1), 1997, 205-214. 19. Peyton, B.M. and Characldis W.G.: "A statistical analysis of the effect of substrate utilization and shear stress on the kinetics ofbiofilm detachment", Biotechnol. & Bioeng., 41, 1993,728-735. 20. Van Benthum, W.A.J., Van Loosdricht, M.C.M., Tijhuis, L., and Heijnen, J.J.: "Solids retention time in heterotrophic and nitrifying bio-films in a bio-film airlift suspension reactor", Water Sci. & Technol., 32(8), 1995, 53-59. 21. Yamagiwa, K. and Ohkawa, A.: "Simultaneous organic carbon removal and nitrification by bio-film formed on O2 enriched membrane", J. oF Chem. Eng. Japan, 27(5), 1994, 638-643.

For further information, contact: Dr Michael Semmens, Department of Civil Engineering,Institute of Technology, University of Minnesota, 150 Civil Engineering Building,500 Pillsbury Drive S.E., Minneapolis, MN 55455, USA.Tel: +1 612 625 9857,

Inventors.: N. Jitariouk, A. Le Moel Publication date: 6 May 1999

Versatile fluid filter Applicant: Sartorius AG, Germany Described here is a pocket filter module which is used for filtering fluids and is characterised by having a high filtration capacity and filtration "certainty". The membranes that are used in the pocket filter are protected from mechanical destruction because the spacers located inside the membrane pocket are covered by a flat, fluid-permeable, protecting material on both sides. This material also extends to the front side facing the dosed end of the membrane pocket, and covers the entire width and length of the spacers up to the connection of the membrane pocket with the core tube. The pocket filter modules can be used to filter beverages, foodstuffs, pharmaceuticals and chemicals. They also can be used in laboratories and for environmental protection, and in biotechnology in which liquid or particulate components such as

@