Lca Interpretation Pezen Edit

8/3/2019 Lca Interpretation Pezen Edit

http://slidepdf.com/reader/full/lca-interpretation-pezen-edit 1/15

Click to edit Master subtitle style

4/27/12

Case study :

disposable versusreusable diapers

55203210053

55203210421

55203210143



4/27/12

Life Cycle Interpretation

A systematic technique to evaluateinformation from inventory and impactassessment.



4/27/12

Objectives

i) Provide recommendation based on resultand limitation based on previous step onLCA

ii) Provide an understandable and completeresult presentation of LCA comply with thegoal and scope



4/27/12

Key Steps to Interpreting the

Results of the LCAStep 1 : Identify Significant issues

Step 2 : Evaluate the Consistency of the data

Step 3 : Draw conclusions



4/27/12

case study :disposable Vs

reusable diapers



4/27/12

introduction

Whether to use disposable or reusablediapers is a controversial issues.

Disposable diapers have become extremelypopular in recent years.

However, disposable diapers use valuablenatural resources and after one use are

thrown into already overflowing landfills.


http://slidepdf.com/reader/full/lca-interpretation-pezen-edit 7/154/27/12

objective

To check and interpret result from differentcase studies

To make a comparison between disposal and

reusable diapers from the previous casestudy



Steps conducting life cycleinterpretation

Step 1 : Identify Significant Issues

Product : disposable and reusable diapers

Process - different raw materials of disposable (pulp and paper,

absorbent gel, LDPE film PP fabric)and reusable (raw cotton)

- additional of laundry process for

reusable diapers



assumptions

The number of daily diapers changes(frequency rate) is the same for bothdisposable and reusable diapers – althoughdisposable generally require fewer changesdue to their greater absorbency.

90% of all reusable are laundered at home –only 10% of consumers using reusable diaperssubscribe to a diaper service.

Step 2 : Evaluate consistency of the Data



Case Study A Result

0

5

10

15

20

25

30

Raw

materials

(lbs)

Energy

(10,000Btu)

Water

(10gal)

Emissions

to Air

(lbs/10)

Waste water

effluents

(lbs/100)

Process

waste (lbs)

Post-

consumer

waste (lbs)

Disposable

Reusable

Figure 1: Disposable vs ReusableDiapers



Case Study B Result

0

20

40

60

80

100

120

140

160

Raw

materials

(lbs)

Energy

(1000Btu)

Water (gal) Emissions

to Air

(lbs/100)

Waste

water

effluents

(lbs/100)

Process

waste (lbs)

Post-

consumer

waste (lbs)

Disposable

Reusable

Figure 2: Disposable vs ReusableDia ers



DISPOSABLE REUSABLE

Raw material H- pulp andpaper, absorbent

gel, LDPE film PPfabric

L- raw cotton

Energy (consume) L- production H- production,laundry

(electricity –washing, drying)

Water (consume) L- production H- production,laundry (washing)

Emissions to air(generate)

L- production H- production,laundry(washingmachine and dryeremits green housegas)



Step 3 : Conclusion

• Both of the figures showed reusable diapersproduce more emissions although the valuewas different

• This consistency of the effect led to

conclusion that Reusable diapers

consume more energy and more water

consume less raw materialsgenerate more emissions to air and

water

generate less waste



Conclusion

• The most important part for Interpretation isconsistency, if one of case studies differs,acceptable conclusion cannot be made

•

The difference may come from;i) Different inventory data

ii) Different method

iii) Boundary choice



THANK YOU…

Lca Interpretation Pezen Edit

Documents

Transcript of Lca Interpretation Pezen Edit