System 1:
Kitchen waste is treated in a biogas plant. Urine faeces and grey water are treated in
a wastewater plant.
System 2:
Kitchen waste is treated in a biogas plant. Urine are collected separately, faeces and
grey water are treated on a wastewater plant.
System 3:
Kitchen, faeces and urine are treated in a biogas plant, grey water is treated on a
wastewater plant
System 4:
Kitchen waste and faeces are composted. Urine is collected while grey water is
infiltrated into soil.