Heat Treatment Technology

Waste Treatment Processing Cycle

Once the clinical waste is loaded and the sterilisation chamber closed the highly automated Newster equipment begins a five stage waste treatment processing cycle.

1st Stage - Loading and grinding At the press of a button, the chamber lid is locked and stainless steel blades commence grinding the waste. As the rotor increases in speed the waste is agitated and control sprayed with water as the temperature increases. As the speed increases the waste is further processed.

2nd Stage - Evaporation of liquids The composition of the waste will determine the duration of the initial processing as the temperature rises and the chamber thermostatically controlled. The phase continues until the generated humidity evaporates. Vapours released during evaporation are treated by absolute and charcoal filters.

3rd Stage - Sterilsation The processing continues with the chamber increasing in temperature and the waste processed via thermal decomposition in order to achieve a sterilised state.

4th Stage - Cooling Water is then sprayed into the chamber to assist cooling the dehydrated homogeneous waste. Water and condensable gases are discharged to sewer.

5th Stage - Unloading and disposal As the final phase concludes the sterilised granular byproduct can be removed from the chute into the integrated waste collector ready for disposal.

Throughout the treatment cycle the key processing metrics are recorded and printed for analysis.

Wastes are loaded into the sterilisation vessel, the lid is closed and the treatment process is started by pressing a button. The engine starts in the first speed, filters start and resistances are turned on.

At 60°C the general water electrical valve opens and water starts to flow in the cooling columns. The rotor turns slowly at first, starting to pulverize the materials, and at the same time the temperature starts to rise.

The rotor turns faster (change from the first speed to the second), the temperature starts to rise rapidly and the materials are finely pulverized.

When 96–100°C are reached, temperature remains stable until the water present in the wastes has completely evaporated.

After the water has evaporated the temperature starts to rise rapidly again, reaching 150°C. After the peak the rotor turns slowly (first speed) and resistances turn off.

The mass of wastes is sufficiently moistened by a water spray to cool down to 95°C.

The sterilisation cycle has now been completed. The vessel is opened, and the product is extracted and collected in the stainless integrated waste collector.