The Water Pages
British Water publishes code of practice for SuDs Technology
In a first for the UK water industry a code of practice for assessing surface water treatment technologies has been published by British Water. The document, which took over two years to develop, has been supported by the Environment Agency and manufacturers of surface water treatment devices.
British Water members ACO Technologies, Hydro International and Polypipe joined with the environmental regulator to sponsor an in-depth study of UK rainfall by research consultancy HR Wallingford. The information was key to the development of a robust product testing protocol.
British Water technical director Marta Perez said, “Standards are necessary to demonstrate how well proprietary devices used in sustainable drainage systems (SuDS) treat run-off and remove heavy metals from the water cycle. Until now, there was no standard for testing in the UK.
“Conducting tests overseas creates a heavy cost burden which was prohibitive for smaller UK manufacturers looking to sell at home. This code of practice defines the process necessary to measure the pollutant capture and retention capability of any device entering the UK market.”
The voluntary code of practice allows professionals delivering SuDS to apply a risk-based approach to minimising the environmental impact of the diffuse pollution from runoff. Verifying the capture and retention capabilities of different devices for a range of pollutants gives regulators, designers, specifiers and local authorities the information they need to select the most appropriate technology in a given application.
The tested devices are typically used to treat runoff from urban and residential hard-surfacing such as roads and car parks. Part of the code of practice is aimed at determining three functional requirements of treatment devices:
• Typical pollutant capture efficiency for frequent, sub-annual rainfall events
• Sediment retention capability for up to 1:2 year rainfall events likely to cause washout
• Capability of filter media to retain dissolved pollutants under the influence of de-icing salt
Ms Perez said, “The tests can be completed by the manufacturer or at a commercial test facility but must be witnessed by an approved independent UKAS-accredited third-party. British Water is now seeking a partner in the position to install and run testing equipment.”
Helen Wakeham, Environment Agency deputy
director (water quality, groundwater and contaminated land) said, “At the Environment Agency we encourage the use of SuDS, and recognise that the right operational guidance is important.
“We have been pleased to work with the industry in creating its own code of practice. I am delighted to see the results, which will further support the implementation of SuDS in England.”
Approval and certification under the Code of Practice: Assessment of Manufactured Devices Designed to Treat Surface Water Runoff will allow manufacturers to demonstrate that their published capture and retention capabilities have been tested.
Southern Water cuts pump downtime with motor-drive package
A low lift pump used for surface water abstraction is now more reliable following installation of an ABB synchronous reluctance motor (SynRM) and drive package.
Southern Water has cut the maintenance of a low lift pump and improved its reliability following the installation of an ABB synchronous reluctance motor (SynRM) and variable speed drive (VSD) package.
The pump is sited at Hardham Water Supply Works (HWSW), which provides water to more than 450,000 customers in the north of West Sussex. It extracts an average of 25 million litres of water per day from the local river.
22 drain TRADER | April 2017 |
www.draintraderltd.com
The first UK code of practice for proprietary devices used in surface water treatment is now available. Image: Hydro International.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84
