Two other advantages of the STRAINPRESS® play an important role when screening grease separator contents:
The STRAINPRESS® can also be used with hot media flows. As the cylindrical machine is covered with an insulation, the operating staff is not faced with the problem of hot surfaces. Due to the completely enclosed design of the machine there is no uncontrolled spreading of potentially explosive atmospheres or nasty odours inside the operational building. These can be removed by suction in the subsequent intermediate tank. From this intermediate tank the screened grease sludge is pumped into the digesters.
As the grease sludge that is delivered to site comes from various different sources, the type and concentration of the sludge in the individual tanker vehicles can differ greatly. The sludge screening system reacts automatically and adjusts the frequency of screen surface cleaning and the dewatering pressure to suit the varying sludge and screenings qualities.
This automatic adjustment ensures constant screening results and a stable screenings dewatering degree even with grease sludges of varying properties.
The plant for processing external sludge on STP Dresden-Kaditz was put into operation in summer 2012. Two STRAINPRESS® sludge screening units have since treated the hot grease sludge very reliably.
About 500 t external sludge are received each month in the two sludge acceptance lines. The amount of screenings separated by the STRAINPRESS® units lies between 15 and 25 t.
With the acceptance of external grease sludge the generated electricity from the block heat and power plant could be increased to beyond the expected result. The two STRAINPRESS® units contribute a considerable share to the stable and reliable operation of the complete grease sludge acceptance plant.