CST Screening Systems products

This screen offers a unique solution for deep channel, high-flow, fine screening applications. The CST Wastewater Solutions band screens feature mesh and perforated holes to 2.0 mm. They are very robust in construction and capable of handling flows in excess of 3000 l/sec. Due to its unique construction and change in direction in flow pattern the screenings capture ratio (SCR ) is very high – of the order of 80%.

The EM31G automatic screen is a self-cleaning continuous belt screen. This type of screen can have a spacing between the filtering elements or teeth of 3 or 6 mm. The material captured by the screen is continuously removed by means of these self-cleaning teeth. The screenings are discharged into a hopper which is also installed above water level.

Our screen model EM100-G consists of a filtering belt having “square” filtering openings with dimensions from 100 up to 400 micron approximately and assuring a perfect screening-filtration. During operation the belt is brushed and washed and gets to the screening phase perfectly clean. The solid material, separated by a scraper and a brush, is discharged into a container. The belt wash water are delivered to the feed tank together with the sewage to be screened. The belt washing is made through some fixed nozzles at the pressure of 6 bar or through swinging nozzles at the pressure of 20-40 bar (it depends on the type of clogging).

The Screen Extractor comes without the pressing section. The special design and structural simplicity of the Screen Compactor and Screen. Throughput rates up to 1000 m³/h.

The Screw Compactor, has combined into one unit a system for mechanical transportation, de-watering and compressing. In this way the screening volume is greatly reduced. The structural and functional simplicity of the compactor design in the form of shaftless flighting, allows for the absence of internal supports and minimum maintenance. The clever design of this equipment allows it to be used in many fields. A sieve following the spiral end of the screw coupled with a discharge closure unit creates the dewatering and compressing action of the screenings. The liquid is pressed out through a specially designed tube. The machine is designed for intermittent working.

We offer a full range of in-channel Rotary Drum Screens. CST has sold in-channel Rotary Drum Screens since 1988. Most of our in-channel Rotary Drum Screens are in raw sewage or in paper mills. These have low head losses in the order of 200 mm and high capacities.

CST supplies a range of internally fed Rotary Drum Screens. Our screens consist of a wedgewire drum inside which is an internal feed tank. Flow passes into the internal feed tank and overflows the weir. The internal feed tank has the function of controlling velocities and reducing the force of the flow onto the wedgewire drum.

The prevailing method of grit removal globally is the vortex grit chamber – the PISTA® unit. Smith & Loveless research and development engineers have dramatically improved the original PISTA® Grit Chamber design. This has led to several patents on the design by Smith & Loveless, including a flat bottom in the grit removal chamber, an inlet baffle with a coanda ramp and redesigned rotating propeller, all of which work together to enhance flow conditions. There are more than 4000 PISTA® Systems installed worldwide and Smith & Loveless is the world leader in this technology.

CST-DAF is a high rate DAF flotation unit. Unprecedented clarification and thickening efficiency is attained by the new hydro direct system combined with the unique micro-bubble screening system: a recent exclusive break-through innovation developed by Aqua Engineering. A truly new system of Dissolved Air Flotation

Plate settlers have been around for over a century, an English patent is dated back to 1886 and French design back to 1887. During the 1930’s, plate settlers were used in mining and mineral industries to separate out heavy particles. In the late fifties, Professor Gunnar Weijman-Hane began a study at Chalmers University of Technology in Sweden. This led to the modern plate settler technology and the GEWE lamella sedimentation system. This system has been further developed, utilising computer design, achieving almost total efficiency in the use of plates with hydraulic flow control and high efficiency of separation