0 votes
111 views
Hello,

I am currently dealing with impact assessment methods and I have the following issues:

1) I've been using EuGeos database (ecoinvent 3.4) but I decided to make my own impact assessment methods as per EN 15804. The results on most indicators are the same, some with very little difference, but there is about 30-40% (it may vary depending on what is calculated) difference when it comes to ADPE. I checked the contents of EuGeos and I found out it had a different list with impact factors, many of which are not listed in  EN15804+A1 (the previous version with the tables in Annex C). I hesitate how to proceed from here - do I have to add the impacts or shall I stick only to what is listed in EN 15804?

2) I tried to export the assessment method through EcoSpold file and then to import it into ecoinvent 3.6 but output flows, waste flows and some resource use indicators are not calculated (all zero). The other indicators are quite different in values, too. So, do assessment methods need some adjustment when export-importing between databases or shall I create a separate method for each database?

Thank you,

Yana
in openLCA by (260 points)
edited by

2 Answers

+1 vote
by (660 points)
selected by
 
Best answer
Hi Yana,

The CML method to be used for ADPE contains, in its original form as reproduced in Table C2 of EN15804+A1, contains characterisation factors (CF) for elements only. But databases (certainly ecoinvent and I'm pretty sure GaBIi too) contain - in the resources in ground category of elementary flows - compounds of these elements, and indeed many of the elements themselves barely occur in nature in an uncombined state. Boron is a good example. This occurs in nature almost entirely as borax (a hydrated sodium borate), and borax is the boron-containing elementary flow in the "resource-in-ground" category that you'll find if you create an LCI for products such as detergents, some fire retardants. Without a CF for borax any calculation of ADPE for a product containing a reasonable amount of borax-based fire retardant will be seriously flawed.  We therefore include CF for compounds of the elements covered by Table C2 of EN15804+A1. I think GaBi does too, because I see consistency of ADPE results for products with known borax content calculated using GaBi and our database. The old (now obsolete) implementation of the CML2001 method in ecoinvent also included CF for compounds.

I hope that helps. As Andreas notes, we will release a new version of the database, also covering EN15804+A2 very soon.

Chris
by (260 points)
Thank you very much, it is indeed a good explanation. Does this mean, that in the impact assessment method we should use both elements and all related in-ground compounds available in the database with the same CF given in the standard? Or shall we use only the compounds? Thank you.

Yana
by (660 points)
In the impact assessment we use the CF for elements as published in the standard, and the CF for their compounds where these CF are based on the proportion of the element in the compound according to its molecular formula. Neither the standard nor the original CML method contain a CF for every element in the periodic table.
by (260 points)
This is really helpful. Thank you very much, Chris.
Yana
0 votes
by (48.7k points)
Hi Yana,

I will ask Chris Foster for the first point, for the second, you should use the JSON-LD format, that allows to exchange LCIA methods. EcoSpold works to some extent. If the database where you import the LCIA method into has a different flow set, you need to apply the mapping as well (available in 1.10.2). Also of course the "normal" ecoinvent database does not contain some of the flows needed for EN 15804 (mainly energy and waste). We are about to release an updated version of the database, based on ecoinvent 3.6.

Hth,

Andreas
by (260 points)
Thank you, it is just that I saw the option "impact methods below" the EcoSpold options and thought it is the one to be used.
...