0.05 μm rating for HiFLO filter
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News and Views Further Inforrnatlon from: M-F Pouet and A Grasmlck, Groupe de Genie des Procedes, Unlversltd de MontpeUier II, place Eugene BatalUon, F-34095 MontpeUler Cedex 5, France. resulting in low extractables and cleaner filtrate. Each cartridge is 100% integrity tested by diffusional flow during manufacture ensuring high product reliability and quality says the company. Membranes directory published An international directory giving information of over 200 membrane companies has been published in the May 1994 issue of Filtration & Separation. The directory features companies that manufacture or supply membranes and related equipment -- including materials and the main membrane types. Full contact details accompany each directory entry. Further Informatlon from: Filtration & Separation, Elsevier Advanced Technology, PO Box 150, Kidllngton, Oxford OX5 1AS, UK. Tel: 0865 843848. Fax: 0865 843971. HtFIow Sol-Vent cartrldge fllter. Further Informatlon from: Gelman Sciences, 600 South Wagner Road, Ann Arbor, MI 48106, USA. Tel: +1 313 665 0651. New product cat ogue from Amicon Amicon has Just published its 1994 product catalogue. Included are details of over 600 products for microfiltratlon, membrane filtration and chromatography. Membrane filtration products offered include spiral-wound and hollow fibre cartridges and systems. Further Information from: Amlcon Inc, 72 Cherry Hill Drive, Beverly, MA 01915, USA. Tel: + 1 508 777 3622. Fax: +1 508 777 6204. 0.05 rating for HiFLO filter Gelman Sciences is now offering its HiFLO Sol-Vent TM cartridge filter with a O.05~u-n rating, specifically designed for high purity filtration of critical process fluids for the chemical and microelectronic industries. The filter is manufactured with Just two materials of construction, PTFE membrane and polypropylene. The cartridge materials are thermally-bonded, Removing nitrogen at low temperature Biological nitrogen removal under low temperature in a membrane separation bioreactor for on-site domestic wastewater treatment has been studied by researchers in Japan, and the results are presented in Wat. Scl. Tech., 28, pp 325--333, 1993. At low temperatures, biological treatment plants suffer from both loss of nitrifying activity and nitrifying bacteria from the system. The purpose of these studies was to examine the effect of complete biomass retention in a membrane separation bioreactor against the severe conditions at low temperature. The bioreactor was operated under intermittent aeration of a 180-minute operational cycle to achieve simultaneous nitrification and denitriflcation for nitrogen removal. Temperature was initiaUy controlled at 25°C and reduced by 5°C stepwise at every 2 weeks duration to 5°C. Nitrogen removal started to deteriorate as temperature dropped to 10°C and from more than 90°C at 25°C reached 20 ° at 5°C. Increasing oxygen supply by increasing aeration time in the operational cycle could completely recover nitrification at 10°C. High nitrogen removal was again achieved by the introduction of a non-aeratlon period. 4 Membrane Technology No. 48
Transcript of 0.05 μm rating for HiFLO filter
N e w s a n d V i e w s
Further Inforrnatlon from: M-F Pouet and A Grasmlck, Groupe de Genie des Procedes, Unlversltd de MontpeUier II, place Eugene BatalUon, F-34095 MontpeUler Cedex 5, France.
resulting in low extractables and cleaner filtrate. Each cartridge is 100% integrity tested by diffusional flow during manufac ture ensur ing high product reliability and quality says the company.
Membranes directory publ ished An international directory giving information of over 200 membrane companies has been published in the May 1994 issue of Filtration & Separation.
The directory features companies that manufac ture or supply membranes and related equipment - - including materials and the main membrane types. Full contact details accompany each directory entry.
Further Informatlon from: Filtration & Separation, Elsevier Advanced Technology, PO Box 150, Kidllngton, Oxford OX5 1AS, UK. Tel: 0865 843848. Fax: 0865 843971.
HtFIow Sol-Vent cartrldge fllter.
Further Informatlon from: Gelman Sciences, 600 South Wagner Road, Ann Arbor, MI 48106, USA. Tel: +1 313 665 0651.
New product cat ogue from Amicon Amicon has Just published its 1994 product catalogue. Included are details of over 600 products for microfiltratlon, membrane filtration and chromatography. Membrane filtration products offered include spiral-wound and hollow fibre cartridges and systems.
Further Information from: Amlcon Inc, 72 Cherry Hill Drive, Beverly, MA 01915, USA. Tel: + 1 508 777 3622. Fax: +1 508 777 6204.
0.05 rating for HiFLO filter Gelman Sciences is now offering its HiFLO Sol-Vent TM
cartridge filter with a O.05~u-n rating, specifically designed for high puri ty filtration of critical process fluids for the chemical and microelectronic industries.
The filter is manufac tu red with Just two materials of construction, PTFE membrane and polypropylene. The cartridge materials are thermally-bonded,
Removing nitrogen at low temperature Biological nitrogen removal under low temperature in a membrane separation bioreactor for on-site domestic wastewater t reatment has been studied by researchers in Japan, and the results are presented in Wat. Scl. Tech., 28, pp 325--333, 1993.
At low temperatures, biological t reatment plants suffer from both loss of nitrifying activity and nitrifying bacteria from the system. The purpose of these studies was to examine the effect of complete biomass retention in a membrane separation bioreactor against the severe conditions at low temperature.
The bioreactor was operated under intermittent aeration of a 180-minute operational cycle to achieve s imultaneous nitrification and denitriflcation for nitrogen removal.
Temperature was initiaUy controlled at 25°C and reduced by 5°C stepwise at every 2 weeks duration to 5°C. Nitrogen removal started to deteriorate as temperature dropped to 10°C and from more than 90°C at 25°C reached 20 ° at 5°C.
Increasing oxygen supply by increasing aeration time in the operational cycle could completely recover nitrification at 10°C. High nitrogen removal was again achieved by the introduction of a non-aerat lon period.
4 M e m b r a n e Techno logy No. 4 8
