Biwater Treatment - Products
Tank Scrapers
Products
Rotating Bar Interceptors
Coarse Screen
Grit Removal
Tank Scrapers
Aerators - Horizontal Rotor
Aerators - Vertical Shaft
•Medium Speed
•Slow
Speed
Tertiary Treatment
Package Plants
Tank Scrapers |
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 36m dia full bridge scraper installation at Workington WwTW, United Utilities |
Key Features: • Side wall scrapers • Weir and channel cleaning facilities • Scum skimming and removal • Steel centre support assembly • Plain, vee notch or castellated weirs • Double edged weir troughs • Continual or automatic desludging controls • Peripheral speed choice • Winch-up scraper blades |
| General Description: Biwater manufacture a complete range of settlement tank scrapers to suit any tank profile, which are designed to collect and remove any type of sludge. They fall into two main categories; fixed bridge scrapers and rotating bridge scrapers. Fixed bridge scrapers have a stationary bridge which spans the tank and a scraper which is supported and driven from the centre. Rotating bridge scrapers have one end of the bridge supported and pivoted at the tank’s centre while the other end is mounted on an end carriage that moves around the tank’s outerwall. Fixed bridge scrapers can be provided for tanks with 6m to 20m diameters and rotating bridge scrapers for tanks with diameters from 6m to 45m. The scrapers themselves can be designed to fit any floor type and can be either fixed, trailing or a combination of the two. In addition, chain type scrapers for steep floor tanks, or hydrostatic draw-off tubes and vee scrapers can be provided for flat floored tanks. Biwater scraper drive assemblies are designed for a minimum life of 100,000 hours ie.11 years. |
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| Scraper & Sludge Removal: The type and design of scraper blade arrangement is dependent on the type of sludge to be removed. Primary or heavy sludge's are usually dealt with by hinged scraper blades supported from a fixed framework carried from the bridge. For secondary humus or activated sludges, trailing scrapers hinged from a rotating bridge are usually recommended. However, hinged scrapers attached to an underwater fixed subframe are sometimes seen as being ideal as they have advantages of both fixed and trailing blades as well as reduced wear to blade edges, the weight of trailing parts being much reduced. This type of scraper arrangement is suitable for all types of sludges, even the heavier primary types. The effectiveness of sludge removal is also greatly influenced by the speed at which the scrapers operate. Again the type of sludge is a factor in this. With primary sludge types it is possible to operate with the tip of the rotating blade travelling at 2.5m/minute, 1.2m/minute being appropriate for lighter sludge's. |
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Tony Gillard
Business Development Manager
+44 (0)1706 367555
Reference Sites
• Workington WwTW, United Utilities
• Blackburn WwTW, United Utilities
• Whitby WwTW, Yorkshire Water
• Todmorden WwTW, Yorkshire Water
• Duncrue Street WwTW, DOE Ireland
• Holland Haven WwTW, Anglian Water
• Oban WwTW, West of Scotland Water
• Rothesay WwTW, West of Scotland Water
Biwater
Treatment Ltd Biwater Place, Gregge St, Heywood,
Lancashire, OL10 2DX
T:+44(01706) 367555 F: +44(01706) 365598 e:info@biwater.com
©Copyright Biwater Treatment Ltd
T:+44(01706) 367555 F: +44(01706) 365598 e:info@biwater.com
©Copyright Biwater Treatment Ltd
