Denco chooses interfilta air filters

Major water treatment order for Porvair Technology Wrexham, UK-based Porvair Technology Ltd, the specialist in the applied technology of porous media, has announced a 5200,000 order for a high-density polyethylene (HDPE) domed diffuser installation for Thames Water. The contract is for the provision of 12,000 diffusers to be installed as part of improvement to the aeration system at Oxford Sewage Treatment Works. Following a detailed survey by both Thames Water and Porvair, domed diffusers were specified to replace an existing system which had become unreliable because of the ageing of the membranes. It is part of a programme to upgrade the plant generally and to meet tighter future consents issued by the NRA (the UK’s National Rivers Authority). A particular area of concern for Thames Water is the need for high efficiencies at low flow rates, with a minimal head of 2.9 m being available to achieve the desired oxygen transfer rate and efficiency. The Oxford contract follows the successful operation of Porvair’s HDPE diffusers at several other Thames Works, including Basingstoke and Rye Meads. Porvair Technology Ltd, Clywedog Road South, Wrexham Industrial Estate, Wrexham, Clwyd LL13 9XS, UK. Tel: + 44 1978 661144, fax: 44 1978 664554.

Recent filtration

and separation

Significant improvements are currently being made in many aspects of membrane separation technology - in the development of new membrane materials with higher selectivity and/or permeability, in the fabrication methods for high-flux asymmetric or composite membranes, in membrane module construction and in process design. Membrane separation technology has generated business totalling more than US$l billion annually. In ‘Membrane Separations Technology - Principles and Applications’, edited by R D Sable and S A Stern, the main objective is to present the principles and applications of a variety of membrane separation process from the unique perspective of investigators who have made important contributions to their fields. Another objective is to provide the reader with an authoritative resource on various aspects of this rapidly growing technology. The text can be used by someone who wishes to learn about a general area of application, as well as by the knowledgeable person seeking more detailed information. Published 1995 by Elsevier Science BV, Amsterdam, The Netherlands; tel: + 31 20 485 3642, North 572

fax: +

31 20 485 3598./h contact Elsevier

America

publications

Science, Neal York; tel: 212 633 3650, fu: 212 633 3680. Price Djl595.OO/US$340.00, 74Opages hardback, ISBN O-444-81 633-X. ‘Advances in Porous Materials’, edited by Sridhar Kemarheni, Douglas Smith and Jeffrey Beck, is the 371st volume in the Materials Research Society (MRS) symposium proceedings series; this particular volume comes from the 1994 MRS Fall meeting in Boston, MA, USA. The volume brings together researches in materials science, chemistry, chemical engineering and metallurgy to offer an interdisciplinary perspective on inorganic and organic porous materials. Micro-, meso- and macroporous oxides, metals, polymers and carbons are discussed. Topics include porous materials and their composites based on layered structures; aerogels, xerogels and their composites; porous ceramics, glasses and their composites; porous metals and alloys; porous carbon and polymers; and characterisation of porous materials. Published 1995 by the&IRS, USA; tel: + 1 412 367 3012, fkx: + 1 412 367 4373. Price $57.00 (MRS members), $67.00 (US List) or $72.00 &reign list), 533 pages hardback or microfiche, ISBN 1-55899-273-l.

Another installation for the Triton underdrain system Wheelabrator Engineered Systems in the UK has been awarded a contract by Northumbrian Water Ltd for the supply of its Triton undertrain ‘Direct Retention’ system. The contract is to supply the system for the four existing filters at Fontburn Water Treatment Works in Morpeth, Northumberland, UK with a capacity to treat up to 22 million litres/ day. Wheelabrator states that the Triton offers considerable advantages over systems currently used in Europe in terms of

performance, ease of installation and maintenance and operating costs, eliminating the problem of ‘filter bed upset that can be experienced with conventional nozzle and similar underdrain systems. Its ability to directly retain filter media eliminates the use of gravel, and saves between 300 to 600 m m of filter depth. Wheelabrator Engineered Systems, Johnson House, Browells Feltham, Middlesex Lane, TW13 7EQ, UK. Tel: +44 181 893 7126; fax: +44 181 893 7018.

Public analysts’ laboratory benefits from Colt scrubbing syste A recently launched air scrubbing system, developed by the specialist producer of air pollution control systems Colt International, has been installed at a new public analysts’ laboratory in Newcastle, UK by Safelab Systems, the Bristol-based turnkey supplier. Safelab was contracted to supply a complete laboratory fume cupboard and extraction system for analytical and consulting chemists J & H S Pattinson, following a fire at an existing laboratory which was

Meltog

secures

Colt International Ltd, New Lane, Havant, Hampshire PO9 ZLY, UK. Tel: +44 1705451111, fm: + 44 1705 454220.

international

West Yorkshire, UK-based Meltog Ltd has secured orders for its model 157 filter tube machine for automotive filter manufacturers in both Italy and the us. Sogefi in Montova, one of Italy’s leading automotive filter manufacturers, has ordered a second 157 Bodymaker from Meltog Ltd, to enhance its overall production capability for perforated metal tubes: Sogefi has a worldwide market for its filters. This order has a value of nearly 190,000 and comprises a fully automatic line taking metal from a reel, cutting it to size,

Denco chooses

caused by the accumulation of hazardous perchloric acid caystals in the extraction system. The new laboratory has been supplied with a Safelab-Colt fume cupboard scrubbing systern. To prevent the risk of fire, Safelab has built a washdown system inside the ductwork to flush out the perchloric acid deposits.

lnterfilta

The air conditioning equipment manufacturer Denco, of Hereford, UK has chosen Interfdta for the supply of air filters. The supply covers various types of filter to be used in both newly manufactured air conditioning units, and as replacements during service visits to installed units by Denco field service engineers. July/August

orders

forming and welding tubes up to 75 m m in diameter. In addition, the Oakland, California-based automotive and industrial filter manufacturer Rago & Sons Inc, has also placed an order for a model 157 machine, worth more than f75,OOO. The system being installed will produce filter tubes from perforated sheets. It is capable of producing a wide range of filter tubes from 25 up to 175 m m and any length up to 255 mm. Meltog Ltd, Gelderd Road, Bristall, West Yorkshire WFl7 SLW, UK. Tel: -I- 44 1924 422822, fax: + 44 1924 422188.

air filters Denco specialises in air conditioning for close control environments, such as computer rooms, dealer rooms, telephone exchanges and modern offices.

Interfilta UK Ltd, Rossendale Road Tra&ng Estate, Fatington Road, Burnleu BBll 5SY, UK. Tel:‘+ 44 i282 413131; fax: + 44 1282 416875. 1995

Filtration

& Separation