D-02 Reuse – water consumption

Aspect D-02 Reuse – water consumption
There are different quality levels of water – freshwater, rainwater, greywater and waste water. Depending on these quality levels water, can be used for different applications (e.g. rainwater for washing clothes). How and under what circumstances is it possible to obtain benefits from the reuse of water?

related study objective

stand-alone LCA comparative assertion

related study phase

goal and scope definition inventory analysis (LCI) impact assessment (LCIA) interpretation reporting

relevant for

new buildings existing buildings construction products screening LCA simplified LCA complete LCA
Provisions Module D looks at the loads and benefits of the net output flow, if relevant and available. If water outputs or any output flow at EoL (not production waste) are reused, then to calculate the net output flow, any use of similar reused water or material as an input in Modules A1–C4 must be considered to calculate the net flow (output − input = net output flow).If there is a net output flow, then the impacts associated with any reuse processes after the ‘end-of-waste state’ can be included in Module D, together with a credit associated with the avoided production of the virgin product.
Rules from:

EN 15978

7.4.6 Boundary for the benefits and loads beyond the system boundary (Module D)

EN 15804

6.2.7 D Benefits and loads beyond the system boundary, information module


Not mentioned

If any water from the building is reused outside the building, then the benefits of this use (credit for virgin water extraction and treatment, together with any impacts from the system boundary before substitutive use) are included in Module D.

If a waste material or waste energy is recycled, then the impacts associated with any processes after the ‘end-of-waste state’ before it can be used to substitute primary material can be included in Module D , together with a credit associated with the production of the virgin product it substitutes.

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