Susteco BIGHANNA T120, Operation Manual, Page: 89 / 139

(C.) HIGH TEMPERATURE, MORE THAN 65ºC AND LOW MOISTURE
The combination of high temperature and low moisture content is not common. In order to cool the
biological process increase fan speed and number of rotations at the same time as the wait time is
lowered so that the compost material is aerated more. Also lower the amount of sawdust by 3-10% in
relation to food waste.
 Lower sawdust amount by 3-10%.
 Increase fan speed.

Increase number of rotations.
 Lower wait time.
(D.) LOW TEMPERATURE AND MEDIUM MOISTURE
Having low temperatures in combination with a good medium moisture content could be caused by
either too much food waste being fed in or that the composter has been fed with too much material
containing nitrogen which leads to incorrect C/N balance.
6.5.1 TOO MUCH FOOD WASTE IS ADDED
If too much food waste is put into the cylinder this will result in low temperatures. In this case the
input of food waste should be lowered temporarily so that the biological process has time to recover.
If possible feed small amounts of food waste many times per day.

Lower input of food waste.
6.5.2 INCORRECT C/N BALANCE
If there is no balance between carbon and nitrogen this can result in low temperatures even if the
material has a good medium moisture content. The material containing nitrogen from household
waste is mainly meat and fish. If there is small lumps (1-3 cm) in the compost material the C/N quota is
usually the problem.
 Add extra sawdust / pelletized sawdust into the material through the inspection doors. Rotate
the cylinder and mix the sawdust / pelletized sawdust with the food waste by turning the
cylinder.
 Increase the amount of sawdust / pelletized sawdust which is added to the food waste by 5-
50% from what was used previously.
(E.) MEDIUM MOISTURE AND NORMAL TEMPERATURE – GOOD HOT ZONE
Medium moisture and a normal temperature in the hot zone
inside the cylinder is illustrated here. The position does not
have to be the first 1/3 but should ideally at least be
in the first half of the cylinder.