Table 4.

Nomenclature used for preliminary tests.

Order/meaning	Identifier	Specific cases
A : simulant faeces pellet feeding	I: individual pellet
	B: batch pellet feeding at the rate defined by the type of test simulated	0.43 g/min for 24 h/day operation, or 1.2 g/min for 8 h/day operation
B: material of the combustion chamber (cylindrical body)	M: metallic (stainless steel)	Location (3) in Fig. 1
	C: ceramic (alumina)	Location (3) in Fig. 1
C:operating period simulated	8 h	Fuelfeeding rate: 1.2 g/min
	24 h	Fuelfeeding rate: 0.43 g/min
D: other features during tests	PH: crucible preheated	Tcrucible: 100–110 °C prior to feeding the first pellet
	RI: spark applied to re-start the combustion	During the test