Page 131 - Materials Chemistry, Second Edition

3.3 Allocation 115

Raw materials

Carton production

100 kg carton
Use

80 kg 20 kg
Material recovery Waste incineration

70 kg secondary 14 MJ electricity
material 80 MJ heat

System boundary

Figure 3.22 Process pattern for waste carton disposal.

System boundary
Credit Equivalence system
Productsystem Raw materials

Carton production
100 kg carton
Use
80 kg 20 kg
Material recovery Waste incineration

14 MJ electricity
70 kg carton
80 MJ heat

- Production - Supply of - Supply of 80 MJ
70 kg carton in 14 MJ electricity heat produced
defined technology EU mix in defined plant

Figure 3.23 Process pattern for the disposal of cartons by means of credit entries via
equivalence systems.

• Since in the base system 70 kg cardboard are made available due to material
recovery, production of 70 kg cardboard from raw materials can be avoided.
Thus, the loads of the production of 70 kg cardboard from raw materials are
accounted and subtracted from the loads of the base system (credit entry).