ServicenavigationHauptnavigationTrailKarteikarten


Forschungsstelle
COST
Projektnummer
C00.0040
Projekttitel
Die Abbildung von Kaskadennutzungen von Holz und Holzprodukten in Ökobilanzen

Texte zu diesem Projekt

 DeutschFranzösischItalienischEnglisch
Schlüsselwörter
-
-
-
Anzeigen
Forschungsprogramme
-
-
-
Anzeigen
Kurzbeschreibung
-
-
-
Anzeigen
Weitere Hinweise und Angaben
-
-
-
Anzeigen
Partner und Internationale Organisationen
-
-
-
Anzeigen
Abstract
-
-
-
Anzeigen
Datenbankreferenzen
-
-
-
Anzeigen

Erfasste Texte


KategorieText
Schlüsselwörter
(Englisch)
LCA; wood; recycling; allocation; support decision; cascade
Forschungsprogramme
(Englisch)
COST-Action E9 - Life-cycle assessment of forestry and forest products
Kurzbeschreibung
(Englisch)
See abstract
Weitere Hinweise und Angaben
(Englisch)
Full name of research-institution/enterprise: Eidg. Materialprüfungs- und Forschungsanstalt EMPA ZEN - Zentrum für Energie und Nachhaltigkeit im Bauwesen Abteilung Holz
Partner und Internationale Organisationen
(Englisch)
A, B, DK, FIN, F, D, GR, H, IRL, I, NL, N, P, RO, SI, E, S, CH, GB
Abstract
(Englisch)
Establishing the life cycle inventory (LCI) of a product is no unambiguous task. Although guidelines for conducting a LCA are available (e.g. ISO 14'040ff), there still remains a variety of decisions during the setting up of the life cycle inventory (LCI) that implicitly or explicitly rely on purely subjective elements. This is particularly true for modelling end-of-life options such as recycling or incineration with co-generation. For wood, no systematic research has been conducted so far on the influence of different allocation procedures related to end-of-life options in LCA. Further on, no systematic evaluation of different allocation procedures regarding their suitability for LCA of wood products has been made. Also almost no experience exists with value-based approaches to the allocation problems in LCAs of wood products. These gaps are closed with this study. The study establishes a set of general and wood-specific requirements a LCI has to fulfil in order to give proper decision support. Further, wood-specific guidelines for the conduct of a LCA are reviewed and discussed with special emphasis on end-of-life modelling of wood products. Recycling or incineration of a creosote-treated railway sleeper are modelled according to various methodological propositions on how to solve the allocation problems related to recycling and final disposal. The different allocation procedures are evaluated according to general and wood-specific requirements on LCIs derived previously. A partial life cycle model of the railway sleeper (including forestry processes, transports and sawmill processes) allows demonstrating the over-all effects of different allocation procedures applied. Similar considerations are made for the modelling of post-consumer wood as input material for particleboard production. The most important conclusions of the study are: · Modelling end-of-life options (including recycling material as inputs) takes recourse to methodological decisions made all over the product system. Establishing a model respecting material- and market characteristics of the materials involved as well as their corresponding management rules of their sustainable use is a real challenge. · Consistent life-cycle models are more than the sum of their inventories. Modelling the end-of-life phase of a product can cause the re-allocation of previous life cycle stages. · Both the material and energy aspects of wood have to be considered when modelling end-of-life options of wood and wood products. Only when considering substitution effects and opportunity costs related to both aspects, statements on the effects and usefulness of recycling can be made in descriptive LCA. · The cut-off procedure cannot be recommended for LCAs of wood products. Also further allocation procedures like the value-corrected substitution are not reasonably applicable. · The selection of an allocation procedure for modelling end-of-life options is more relevant for the result than the selection of an allocation factor for the co-product allocation throughout the wood processing chain. · Treating inputs like bark, sawdust, squarings, chippings and coarse chips as 'by-products' with no environmental interventions from up-stream processes attributed leads to tenable results in streamlined LCA (if it is agreed to the above statement). · Modelling post-consumer used wood such as furniture as input material (e.g. for particleboard production) can imply large uncertainties in respect to their environmental burdens to be partly attributed to the product system under study, depending on the allocation procedure chosen. This problem is less severe in cases where material is recycled to the same product, e.g. particleboard to particleboard. However, in such cases a compromise has to be found between the descriptiveness of the model and the uncertainties related to data used and its underlying assumptions. · Stakeholder agreements are essential for the acceptance of LCA results in order to fulfil its role as decision-support tools. This research has been conducted within the European COST Action E9 'Life-Cycle Assessment of Forestry and Forest Products'.
Datenbankreferenzen
(Englisch)
Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. +41 31 322 74 82 Swiss Project-Number: C00.0040