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Improvements in biological aerated filters
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In GB 2302089 T h a m e s Water Utilities Ltd describes an apparatus in the form of a treatment vessel. It comprises a high-voidage media bed situated above a lowvoidage granular media bed. The fluid to be treated, combined with an effluent recycle f l o w s t r e a m and i n t e r m e d i a t e recycle flow s t r e a m as a p p r o p r i a t e , f l o w s d o w n t h r o u g h the flooded aerated high-voidage media, through an intermediate section containing a collection trough, and down through the aerated packed bed of granular media. The trough is known as a 'washout' trough. The high-voidage media material is supported on a grill or grid. During a cycle any surplus treated water passes out of the intermediate section, while backwash l i q u o r s pass out of the vessel. Inventor: A.J. Smith, Date of publication: 8 January 1997.
High-efficiency air filtering apparatus In GB 2302292 Appliance Development Corporation describes a high-efficiency air filtering apparatus for cleaning and circulating air in a closed room. It is in the shape of a vertical cylinder, and includes a semi-cylindrical housing and a semicylindrical filtering chamber, both enclosing a centrifugal blower configured to suck filtered air out of the apparatus through the filter and b l o w it into the room. The filtering chamber contains a closely pleated filter sheet of HEPA filter
material, which is covered top and bottom by flat panels, and pressed onto the semi-cylindrical housing, to make the apparatus completely airtight. The filtering chamber is held onto the contour of the housing, and is fastened to the top and bottom of the housing, permitting replacement of the filter after clogging. A pressure sensor is mounted on the blower housing, configured to c a u s e a v i s i b l e signal as soon as the pressure i n s i d e the housing rises a b o v e a p r e d e t e r mined magnitude because of c l o g g i n g of the filter. Inventor: D.Z. Glucksman, Date of publication: 15 January 1997.
Reversible boom for oil collection and separation In GB 2302289 T.G. Pringle describes a reversible b o o m for c o l l e c t i n g and separating oil from open water. A collection trough is located uppermost on a floating longitudinal boom, with buoyant flaps (whose movement is restricted by stops) positioned along each edge of the mouth of the trough to entrap oil, s e w a g e or other floating p o l l u t a n t s . The effective height of the boom is increased by the action of an incoming wave pushing up the rear, leeward flap, thus preventing wave flow beyond the boom, and the r e b o u n d i n g wave pushes up the w i n d w a r d flap, prev e n t i n g b a c k f l o w to the main body of the slick• Collection vessels may be provided, fed by the trough, allowing water back to open water while holding back the entrapped oil. The boom may be oval- or diamondshaped in cross-section, a second trough may be provided on the underneath side of the boom so as to remain operational if upt u r n e d , and it m a y be inflatable. Date of publication: 15 January 1997.
Water filtration apparatus In GB 2302290 R.T. Firmin and G.A. Bourne describe
an apparatus for filtering water. It comprises a solids settlement vessel, a sump at the bottom of the vessel for receiving settled solids, and s o m e means in the vessel for receiving water to be filtered and for reducing the flow rate of the water. The received water has an outlet exiting into the vessel at or adjacent to the sump. Date of publication: 15 January 1997.
the first separator; the seal is selectively inflatable. The first separator may be in the form of a m u l t i - c y c l o n e , consisting of four cyclone pods which remove particles above a predetermined size. The second separator may be in the form of a filter, w h i c h r e m o v e s substantially all of the remaining particles;. Inventor: A. Williams, Date of publication: 29 January 1997.
Transportable rock screening plant
In GB 2302514 Hydraplant E q u i p m e n t Pty Ltd d e scribes a transportable rock screening plant which comprises primary, secondary and t e r t i a r y screens, all mounted on a chassis. The plant further comprises a rock feeder, also mounted on the chassis, and a hopper s u r r o u n d i n g and located i m m e d i a t e l y above the rock feeder. The screening plant is d e s i g n e d to receive relatively large rocks, usually not larger than 1.5 m in diameter. The rock screening plant in operation classifies relatively large rocks and/or stones into at least four sizes. inventor: P. Cooper, Date of publication: 22 January 1997.
Separating solids from fluid In GB 2302663 Paint & Powder Systems Ltd describes a separation assembly suitable for removing airborne p a r t i c l e s from a p o w d e r coating booth, It comprises two separators, with the second one located downstream from the first• The first separator is removable and replaceable by an identical separator. It should be possible to slide the first separator in and out of a frame. There is a means of indicating the correct posit i o n i n g of the s e p a r a t o r within the frame. The frame may have an inlet connected to a spray booth, and an outlet connected to the second, s e p a r a t o r . A s e a l m a y be p r o v i d e d around the inlet and outlet, and may be engaged with
In GB 2;302728 Ching-Hung Chen describes a filter hood which includes a casing with a top exhaust port and two d o w n w a r d wind box mounting flanges. A wind box is mounted inside the casing, and detachably fast e n e d to the w i n d b o x mounting flanges by hook joints. The wind box housing has t w o d e t a c h a b l e fans, witih two grease filters mounted on a suction port on the wind box to filter grease from air. The back of the b o t t o m c o v e r is hinged to the back of the casing, and the front is fastened to the front of the c a s i n g by locks. When moved to its open position, the bottom c o v e r a l l o w s access for maintenance to the filters. The hook joints include two oppositely mounted, curved pull bars. Each lock includes a push rod and a latch bolt located in a retaining hole in the casing. Date of publication: 29 January 1997.
Dynamic tilter system In GB 2302819 Pall Corporation describes a dynamic filter system, which comprises a dynamic filter assembly, including one or more filter elements and one or more members fitted within a housing. The filter element.,; and members are interleaved, and arranged to rotate with respect to one a n o t h e r . I n v e n t o r s : J.D. Mitler, T.J. Fendya, J.E. Ryan Jr., H. Randhahn and H. Vogelmann, Date of publication: 5 February 1997.