Anglian Water selects ZS blowers for wastewater treatment 07 June 2012

Anglian Water has chosen Atlas Copco's low-pressure ZS blowers to supply air to aeration diffusers at four of its wastewater treatment re-development sites.

A total of 22 ZS90 variable speed drive, oil-free rotary screw displacement blowers will be installed at the sites in Colchester, Letchworth, Bedford and Flag Fen, near Peterborough, as part of the water authority's initiative to find innovative ways of reducing its energy costs.

Aearation diffuser Hydrok's product manager Mark Lunn explains that in a typical biological wastewater treatment plant, the blower system accounts for up to 70% of energy usage.

That's why Anglian Water went for Hydrok's submerged, high-efficiency, bubble aeration framework systems, which incorporate bio textile curtains and fixed bed media, capable of improving air distribution. It's also why Hydrok chose Atlas Copco ZS low pressure screw blowers, which claim energy cost savings of up to 35%.

The blowers, fitted with weather proofing kits for external installation, are being installed at Anglian Water's wastewater plants in Flag Fen and Bedford.

Using the ZS range will also allow Anglian Water to locate the blower motor inverters, controls and condition monitoring in an Anglian Water designed purpose built MCC room. At the Letchworth and Colchester sites, the blowers will be located within an existing plant room.

In the case of the Letchworth site Anglian Water also chose to reduce installation costs by installing ZS+ blowers supplied with an integrated frequency converter that varies the speed of the 90kW motor to match changes in the blower air demand.

"These units will deliver a reliable supply of totally oil-free air, which is an important factor in our specifications, and we are confident that there will be a very positive contribution to improving energy efficiency and reducing Anglian Water's carbon footprint," states Lunn.

"As a contractor, we also benefit from Atlas Copco being a supplier partner that can provide us with complete 24/7 product support," he adds.

Brian Tinham

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