The moist heat without pressure

The moist heat method consists to submit for a certain time the material to a temperature sufficiently high in presence of water under liquid form. The combination causes the deterioration of the enzymes and proteins of the microorganisms and, by consequence, their death and the destruction of the spores. The effect is a lot faster in comparison to the method known as “dry heat” (asking also temperatures well much higher), because in this case the mechanism of action is based on the slowest oxidization by the air of the essentials of the cells. The autoclaves are the most known devices applying the moist heat method. For a physical law, by increasing the pressure also increases the boiling point of the water that, under pressure, remains under liquid form beyond 100°C. In general, the heating can be made either with electric means or also by injecting saturated steam.

The steam, produced on site or injected, acts as vector providing the material under treatment both for the heat and the liquid water by condensation of the steam itself. Pay attention that is neither the steam nor the pressure to cause the death of the microorganisms, being the pressure only one of the ways to have liquid water at a temperature higher than 100 °C. Indeed, by the tables of the saturated steam, we can observe for example, that at the relative pressure of 1 bar (say, 2 absolute bars) the water has boiling point of 121 °C. In the Converter® equipments no pressure is used but, when the previously dehydrated material has reached the sterilization temperature set at 151 °C, the injection of water allows to keep wet the material at high and firm temperature, while restoring continuously the water and the heat subtracted for evaporation of the water itself. While continuing to warm through the rotor and at the same time to inject water, the result is that, in the same time, the material is submitted to the high temperature and presence of water under liquid form.

The Converter® equipments are projected to be compliant with the most strict rules, taking as a reference the norms asking that the sterilization process should be suitable to guarantee the abatement of a microbial load conventionally fixed in N = 1012 u.f.c. (units forming colonies) for every sterilization load, with a SAL (level of sterilization safety) not lower than 10-6 (Italy, UNI norm 10384/1994, law DPR 254/2003). In general, the crushing and the dehydration are also asked, to the goals of not to recognize the waste components and for a better efficiency of the treatment, as well as the reduction of volume and weight. The Converter guarantees therefore an abatement not lower than 10-18, say 18 logarithms that is one microorganism alive every cycles.

The reaction rate depends on the temperature,
the Converter® are designed to operate on two levels of temperature:


at 151°C


at 121°C

Each treatment cycle takes place with a certain sequence: loading the waste, grinding and heating up to 100 ° C, evaporation of each liquid component, heating up to 151 ° C (or up to 121 ° C), sterilization (pasteurization) through the injection of water, maintaining the temperature for 3 minutes, lowering the temperature, discharge by the centrifugal force.


The final product of the technology Converter®,
being deprived of water, it has a high calorific value.


Other technologies available on the market, particularly autoclaving and microwave, produce a resulting moist material, with low calorific value.


The technology Converter®, separating and recovering the resulting water from the sterilization process, allows to obtain a resulting material completely dry.

The best ideas are the simplest ones.


Converter® technology allow to obtain a final product reduced in weight and volume,
totally dry and safe in less than 30 minutes.


50% reduction of weight



80% reduction of volume