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Retrofitting Step Type Sewage Screens. Do You Replace With a New One?

Step Screen was invented by HUBER’s Swedish subsidiary Hydropress AB in the early 1980’s and has been the most copied fine screen.

Across Australia and New Zealand hundreds of step type screens have been installed with many now reaching their end of life.

So do you replace the step screen with a new one or with an alternative technology?

Hydroflux installation of a HUBER sewage screen

Since the invention of the step screen many different screen types are now available on the market which offer higher screening capture rates.

A summary of solutions from Hydroflux Epco is as follows:

Screen Type Advantage Disadvantage
RakeMax Mutli Rake Bar Screen
  • High screening efficiency
  • Totally enclosed
  • Easy to retrofit with similar dimensions to step screen
  • Handles very high levels of grit, sand and screenings
  • NSEF certified for 75% capture
  • Submerged bearing
  • One dimensioning screening profile
Escamax Band Screen
  • High screening efficiency
  • Totally enclosed
  • Easy to retrofit with similar dimensions to step screen
  • NSEF certified for 84% capture
  • Higher headloss than step type screen
  • Reliance on washwater supply

There are numerous items to consider when replacing a step type screen:

  • Screening capture rates
  • Additional headloss and hydraulic considerations that the inlet works can sustain
  • Reliable washwater supply is required with some screen types
  • Channel modifications to accommodate a new type of screen

Hydroflux Epco’s staff have been involved with sewage screening technology since the mid 1990’s and can provide advice on how to approach the replacement of your existing step type screen with either a new or alternative screen type.

For more information on the Hydroflux Epco’s Screens and screening systems please click here.

About the Hydroflux Group
The Hydroflux Group comprises eleven companies based in Australia, New Zealand, Fiji and the UK, providing design and build, equipment, processes and operational services in water and wastewater treatment.
Hydroflux Epco NZ Ltd is a member of the Hydroflux Group.

Contact
Hydroflux Epco NZ Ltd
Level 26, PwC Tower, 188 Quay St
Auckland 1010 New Zealand
P +64 9 352 2052
[email protected]