B. Rotary kiln e built with a 2% incline sloping in the direction of the secondary combustion (afterburner) chamber where incineration of plastic waste takes place. The duration of the incineration process depends on the LCV and the moisture content of the waste. Due to the very high LCV of the waste, a large diameter of the combustion chamber in relation to its length was used (diameter of 2 m and length of 4 m). As shown in Photo 1, the rotary kiln is short but has a large diameter.