Applying Life Cycle Assessment (LCA) to North American End-of-Life Vehicle (ELV) Management Processes
Bibliographic record
Abstract
To improve our understanding of the ramifications of the end of-life vehicle (ELV) management practices currently employed in North America, life cycle assessment (LCA) methods will be used to analyze ELV dismantling processes, ELV shredding and baling systems, and shredder residue (SR) recovery/treatment processes. Further, it is proposed to use the ELV studies to demonstrate how the LCA process may be employed to identify and evaluate tradeoffs between alternative technologies and unit operations for handling and processing ELVs. Literature will be examined and case studies conducted, in cooperation with industrial recycling partners, on working ELV management facilities (e.g. dismantlers, auto wreckers, wet/dry shredding processes, baling processes and SR processors). Subsequently, “successful” ELV practices, unit operations, and/or technologies will be identified, and their practical constraints and issues of concern examined. This will include concerns resulting from processing co-mingled non-ELV shredder/baler feed streams (e.g. appliances, demolition waste). Using the case study information and supplemental data, a life cycle inventory (LCI) of typical ELV management processes will be constructed. Life cycle assessment methods will then be applied to the LCI to determine tradeoffs between alternative processes and to identify preferred alternatives. The research will identify key issues and preferred approaches for using LCA to improve material recovery and recyclability. These include: Regulatory aspects of ELV management in North America and the impact of the European Union (EU) ELV Directive. Issues that impede effective recovery and recycling of scrap materials (e.g., plastics) from pre-shredder/baler ELVs and from SR, such as: Contamination from ELV shredder/baler feed streams (e.g. mercury, lead, chromium); Contamination from co-mingled non-ELV shredder/baler feed materials (e.g. PCB, mercury, lead, cadmium); Materials liberation. Market reintroduction issues with respect to products and materials recovered from ELVs, such as the value of virgin materials versus recycled materials.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.006 | 0.006 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.007 | 0.006 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.004 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".