Introduction to Life-Cycle Assessment and Decision Making Applied to Forest Biomaterials 175
Flow Category Type Unit Amount
Hydrocarbons (other
than methane)
Air/unspecified ELEMENTARY_FLOW kg 2.16E-04
Methane Air/unspecified ELEMENTARY_FLOW kg 8.38E-06
Nitrogen dioxide Air/unspecified ELEMENTARY_FLOW kg 3.19E-05
Nitrogen oxide Air/unspecified ELEMENTARY_FLOW kg 2.75E-04
Nitrogen oxides Air/unspecified ELEMENTARY_FLOW kg 3.07E-04
Particulates,<10 um Air/unspecified ELEMENTARY_FLOW kg 4.81E-06
Particulates,<10 um Air/unspecified ELEMENTARY_FLOW kg 2.26E-06
Particulates,<10 um Air/unspecified ELEMENTARY_FLOW kg 5.78E-06
Particulates,<2.5 um Air/unspecified ELEMENTARY_FLOW kg 5.41E-07
Particulates,<2.5 um Air/unspecified ELEMENTARY_FLOW kg 1.26E-06
Particulates,<2.5 um Air/unspecified ELEMENTARY_FLOW kg 5.33E-06
Sulfur dioxide Air/unspecified ELEMENTARY_FLOW kg 2.74E-06
Transport, passenger
car, gasoline powered
Transit and ground pa PRODUCT_FLOW p*km 1.00E+ 00
VOC, volatile organic
compounds
Air/unspecified ELEMENTARY_FLOW kg 2.22E-04
Inputs
Gasoline, at refinery Petroleum and coal pr PRODUCT_FLOW l 6.30E-02
Transport, barge,
average fuel mix
Water transportation/ PRODUCT_FLOW t*km 1.96E-02
Transport,
combination truck,
average fuel mix
Truck transportation/ PRODUCT_FLOW t*km 2.03E-02
Transport, ocean
freighter, average fuel
mix
Water transportation/ PRODUCT_FLOW t*km 1.39E-01
Transport, pipeline,
unspecified
petroleum products
Utilities/fossil fuel ele PRODUCT_FLOW t*km 2.05E-01
Transport, train,
diesel powered
Rail transportation/r PRODUCT_FLOW t*km 3.79E-02
Problem 2 A cellulose super absorbent production plant is producing absorbent at a
rate of 50,000 kg per day. The factory burns nonrenewable natural gas at a rate of 0.06
million BTU per kg of product. During the combustion, the following are released per
kg of product: 0.05 g CH 4 ,0.005gN 2 O, and 1.6 kg of CO 2. All other sources of GWP
for the factory are negligible compared to this combustion. What is the gate-to-gate
carbon footprint in kg CO 2 e per kg of super absorbent? Characterization factor CO 2 :
1kgCO 2 e/kg CO 2 , Characterization factor CH 4 :34kgCO 2 e/kg CH 4 , Characterization
factor N 2 O: 298 kgCO 2 e/kg N 2 O.
