Simple, smart inline rotary fine screening offers front-line benefits

ADVANCED WASTEWATER fine screening technology from CST Wastewater Solutions features headworks designed for easy installation, high screening efficiency and low-maintenance over diverse paper mill wastewater treatment applications encountered globally, promises the manufacturer.

The ‘robustly-engineered’ horizontal in-channel rotary drum screening technology has been successfully proven internationally for paper mill wastewater, says CST managing director, Michael Bambridge, and has performed constantly and reliably in both industrial and municipal applications. It is also cost-effective to control environmental spills, reduce maintenance and associated OH&S issues, he says.

Applications suited to its fine screening capabilities include pulp and tissue mills, recycled paper plants, wood and chipboard plants, which will benefit from the technology’s 3mm screening, protecting dissolved air flotation, primary treatment and biological treatment. The high-flow, in-channel screen can screen as finely as 500 microns, offering a formidable first line of defence to prevent downtime and environmental risk, says Bambridge.

“Efficient screening is vital to all the downstream treatment and recycling stages in a wastewater processing plant, regardless of the location and input. Unless solids are efficiently separated out from wastewater at the start of any treatment process, you are inviting trouble into the system – and this can cost operators dearly in terms of downtime, environmental risk, clean-up costs and OH&S hazards for the teams involved.”

Bambridge says applications and inputs for which CST’s rotary fine screen technology are engineered to reflect the hugely diverse inputs and needs encountered by different applications and locations throughout the world.

“We are especially mindful of the fact that many lean and efficient industries and municipalities can’t afford the luxury of technologies that need the high level of engineering support with site staff these days. This is the same in Australasia, where CST has been operating for more than 30 years.

“So, we have designed and built our robust, low-maintenance, quality stainless steel screens to provide the simplest but most efficient technology available, proven on multiple MBR plants to perform outstandingly well in the diverse separation tasks of inlet headworks.

“The system is built to be versatile, flexible and robust, because these tasks vary not only from place to place, but day-to-day and week-to-week as loads on the system change.

“WWTPs have to respond continually to the variable loads as well as separate solids to prevent blockages and protect downstream biological and/ or physical processes, while minimising the overall operating costs and stress on plant and staff.

“CST Wastewater Solutions’ in-channel technology has low head loss at peak flows, which increases solids capture efficiency compared with typical traditional screening at wastewater treatment plants.

“Advantages of this technology when dealing with fine screening of larger flows (5mm or finer screening on flows up to 2000 l/sec flow) include automation, mechanically robust but simple, self-cleaning and high screenings capture for reduced maintenance and low whole-of-life costs compared with other types of screens, such as band and inclined drum screen designs, for example.

“The benefits of an efficient engineering concept and thorough detail engineering have combined to produce very low whole-of-life costs, with servicing required only every 4- 6 years. These are very important considerations for competitive industries that have budget constraints, and with limited engineering resources, to whom ongoing reliability, low operation costs and minimisation of risks are important.”

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