The past few years have seen an increased focus on disposal costs and energy consumption. In addition, the industry would like to minimise the consumption of polymers related to sludge dewatering.
These three parameters have played a vital role during the development of the screw press from Stjernholm.
The screw press works with max. 1.5 revolutions per minute and is powered by a low-energy gear motor of just 1.5 kW. This ensures not only a very low energy consumption level but also a noise level of max. 65 dB(A).
The influx pressure is increased and controlled by a pressure transmitter and the dewatering area is divided into three zones with various openings. Utilisation of either a KANTSPALTESI, a perforated sheet with round holes or a combination of the two is possible, depending on local conditions.
Everything is made of durable stainless Aisi 304. The press requires only a minimum of maintenance and the entire steering of the dewatering process from influx, supply and mixing of polymer to discharge of dewatered sludge through the screw conveyor is fully automated and controlled.
Depending on the characteristics of the influx sludge, a dewatering level of 18-25% TS can be achieved with minimal utilisation of polymer.