CASE STUDY: Severn Trent installs ZS blowers to upgrade RGF processes

Severn Trent Water has installed ZS oil-free rotary screw blowers from Atlas Copco as part of an upgrade to six of its water treatment plants in the UK...

May 15th, 2017
Content Dam Ww Online Articles 2017 05 At7828   Severn Trent Little Eaton 4

DERBYSHIRE, UK - Severn Trent Water has installed ZS oil-free rotary screw blowers from Atlas Copco as part of an upgrade to six of its water treatment plants in the UK.

This forms part of a major infrastructure refurbishment programme, including upgrades to its Rapid Gravity Filters (RGF) processes installations that require low pressure air for sand de-scouring duties.

The latest phase of the project has seen ZS blowers installed at the Little Eaton Water Treatment Works in Derbyshire, which supplies drinking water to the growing community in the city’s North-West area.

Over time, it became clear that the site’s RGF process required a significant overhaul in order to improve operational efficiency, which would require the replacement of its existing blower installation.

Civil engineering company MWH Treatment was one of the main contractors for the infrastructure upgrade project.

MWH turned to authorised Atlas Copco distributor Cooper Freer to specify, deliver and install two ZS 75+VEA-C-600 low pressure blowers, together with all associated stainless steel pipework. The blowers were subsequently positioned on a high level external site adjacent to the RGF galleries.

Pulsation-free air is delivered at an output rate of up to 3325 m3h dependent upon process demand. The new blowers at Little Eaton were supplied as variable speed units linked to the plant’s own existing inverter control system.

Kelvin Smith, MWH project manager, said: “Atlas Copco’s distributor, Cooper Freer were very pro-active at the design phase in accommodating quite a few changes at an early point in the progress of this project. The blowers arrived on time and were successfully installed on the high ground level site. We found that they were always on hand to discuss any issue arising from design and installation and were very safety conscious during the construction stage resulting in a very successful project completion.”

Stephen James, Severn Trent Water’s project manager for the upgrade at Little Eaton, said: “Not only do the blowers enable a smoother flow in the filter de-scouring process, they also provide the peace of mind in providing 100 per cent oil-free air to reduce the risk of contamination to the drinking water supply.”

Severn Trent Water chose MWH as one of the design and construct contractors for its AMP6 framework. MWH will work alongside Severn Trent Water’s own staff to manage the operation, supporting the delivery of its programme of work throughout AMP6; which runs until March 2020.

Apart from Little Eaton, Cooper Freer has installed four Atlas Copco 90 kW ZS variable speed blowers to replace all the existing lobe blower technology at Severn Trent Water’s Worcester treatment plant.


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