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Wastewater project demonstrates efficiency and OHS gains for industry

Supplier: CST Wastewater Solutions By: Michael Bambridge
09 March, 2016

High efficiency fine screening technology engineered to deliver low maintenance performance with reduced OHS hazards for municipal and industrial waste water schemes is demonstrating immediate results in one of its recent applications.

CST Wastewater Solutions has installed SCF screen extractor technology for the co-joined towns of Harden and Murrumburrah to improve the treatment system for a population of approximately 2,000 people.

The SFC (screen press for channel installation) Screen Extractor is also suitable for applications such as food and beverage, manufacturing and processing, mining, energy and resources camps where its low maintenance /high hygiene qualities are appreciated, agribusiness, and remote installations where low maintenance and high efficiency is a priority for users who don’t need to have specialist staff constantly available.

The SFC allows for a much finer level of screening – 5mm compared to the old system at 60mm – which has led to a significant reduction in solids in the tanks, more efficient treatment and less maintenance issues.

The technology – designed to lower investment, operational and maintenance costs in screening of municipal and industrial waste water with compacting of extracted solids – has also cut the amount of maintenance and waste that has to be handled by plant operators, reducing operational health hazards and improving OHS performance. The same benefits are widely applicable to other industry and municipal applications, says Michael Bambridge, Managing Director, CST Wastewater Solutions.

"The fine screening at 5mm aperture made a significant difference within days of commissioning the screen extractor," he says.

"The existing system utilised manually coarse raked bar screens with a 60mm aperture which was both operator unfriendly and inefficient. Consequently, a large amount of the fine screenings passed into the downstream sedimentation tanks and trickling filters," he said.

"Not only are the tanks clearer and more efficient now, but the screen extractor also operates on level control and is fully automated, eliminating the previous labour intensive operator handling of screenings," he said.

The robust and proven extractor is constructed from AISI 304 or 316 stainless steel without the need for hanger, intermediate or bottom bearings. Featuring a space-efficient design suited to small sewage pump stations, the unit can handle up to 400m3 an hour. Easily retrofitted into existing pump stations with depths up to 8m, the screen allows removal of material before pumping, says Bambridge.

Advantages include:

  • High durability with low speed operation and robust shaftless spiral in high tensile carbon steel and stainless steel AISI 304 or 316.
  • No jamming or blocking even with long or fibrous products. No mechanical components are in contact with handed products. The unit is fully enclosed for odour control.
  • Extracted solid volume reduction up to 40 per cent, depending on the product.
  • Capability to discharge solids in a plastic bag, single or continuous type. Capability also to wash solids.
  • Intermittent operation in presence of solids.
  • Different apertures from 0.25-10mm.
  • Custom-designed machines possible.

The versatile SFC Screen Extractor can be installed in a channel or supplied with self-supporting tank, complete with inlet and outlet flange and optional bypass screen.