4
BIOLOGICAL PROCESS
More detailed information on the definition of food waste see 1.6.4 Function, range of application
and limitations of use.
The information about obtaining temperatures and the biological process in this manual
constitutes no guarantee to do so by the manufacturer.
The quality of the produced compost, temperatures, moisture content etc is depending solely on
the raw material (food waste and absorbent material) and on how the machine is operated. The
manufacturer or distributor can therefore never guarantee the performance of any machine.
To compost food waste we use nature’s own process in a perfect balance. Microorganisms decompose
the waste material. A biological combustion is taking place inside the Composter.
The biological process requires:
Carbon and Nitrogen (C:N) + Heat + Moisture
→
in balance.
4.1
OXYGEN - AERATION OF THE MATERIAL
Carbon and Nitrogen (C:N) + Heat + Moisture
→
in balance.
If the decomposing process lacks oxygen there will be a fermentation process. When the cylinder
rotates, all material inside the cylinder is provided with oxygen. For further aeration of the material,
the Composter has a fan installed that works continuously at low speed and produces a proper air
flow. The biological process is highly dependent on the air supply in the cylinder. As shown in the
picture on the next page we use the biological heat from the cylinder to pre-heat the air in between
cylinder and hood. Both cylinder and hood are insulated.
Note! Without the fan functioning properly and ventilation path being kept clean, the biological
process will not work! Clean ventilation filter regularly!
The regulation of the fan is only for the speed of the fan during the waiting time. When the cylinder
rotates the fan is always working at full speed. The fan is the “lungs” of the Big Hanna – if the biological
process does not get the right amount of oxygen the result will be a bad smell so it is important to
regularly check the airflow and to understand how the airflow works.
