Golden Circle improves solids capture

CST Wastewater Solutions
Tuesday, 10 June, 2014

An upgrade at Heinz Australia’s Golden Circle plant in Brisbane, featuring CST Wastewater Solutions’ high-efficiency rotary drum screening, is said to have sharply improved solids capture and reduced solids waste disposal volumes.

The screening technology was used by Golden Circle to replace a previous plant with 1 mm screening capacity. The new installation features a 0.5 mm rotary screen, complete with compactor. The complete installation was designed, supplied and installed by CST.

The installation allows improved and greater removal of solids from the wastewater, with considerably better solids capture, said CST Managing Director Michael Bambridge.

“The compact, new, high-efficiency system also allowed the removal of a tall existing structure and hoppers, making solids handling more accessible for the plant operator, improving operational efficiency and enhancing OHS benefits by reducing solids handling,” he said. “The compaction unit also reduces, by up to half, the volumes of solids to be transported.”

The design features all-stainless construction, including base frame, and is fully enclosed for OHS odour and aerosol control. Additional features include:

non-lubricated chains and non-metallic drive sprockets
upgraded running wheel design
no mechanical parts in contact with screened solids
corrosion resistant
designed to handle high fat and grease loadings
self-cleaning

The internally fed rotary drum screen can use wedge wire or perforated hole drums. Wastewater passes into the internal feed tank before overflowing the weir onto the screen face of the drum. Solids are collected on the screen face, while the screened water passes through the screen face under gravity. Collected solids are discharged via the screen drum mouth. The internal feed tank controls inlet velocities and distributes the flow evenly onto the screen face.

“The full stainless screen design is highly versatile, accommodating either slot or hole configurations, depending on the application,” said Bambridge.