Intent:
To mitigate post-sorting contamination or residue rates for the successful recirculation of recovered materials
Requirements:
Demonstrate that material recovery facilities (MRFs) operated by the municipality, or operated by companies contracted by the municipality, or operated by companies subcontracted by franchise haulers, achieve the following post-sorting contamination/residue rates:
Mixed Waste MRFs
Tier 1: Achieve post sorting contamination/residue rates below 10%
Tier 2: Achieve post sorting contamination/residue rates below 5%
Tier 3: Achieve post sorting contamination/residue rates below 3%
Paper/Paperboard <10% Moisture | Metal | “MRF Glass” | Plastic Bale Contamination | |
Tier 1 | Outhrows + Prohibited 90% of maximum allowed for each grade | 90% of maximum allowed for each grade | Non-glass residue & Fines < 10% |
|
Tier 2 | 70% of maximum | 70% of maximum | <7% |
|
Tier 3 | 50% of maximum | 50% of maximum | <4% |
|
Single Stream MRFs
Tier 1: Achieve post sorting contamination/residue rates below 5%
Tier 2: Achieve post sorting contamination/residue rates below 3%
Tier 3: Achieve post sorting contamination/residue rates below 1%
Paper/Paperboard <10% Moisture | Metal | “MRF Glass” | Plastic Bale Contamination | |
Tier 1 | Outhrows + Prohibited: 80% of maximum allowed for each grade | 80% of maximum allowed for each grade | Non-glass residue & Fines < 7% |
|
Tier 2 | 60% of maximum | 60% of maximum | <5% |
|
| Tier 3 | 40% of maximum | 40% of maximum | <3% |
|
Dual Stream MRFs
Tier 1: Achieve post sorting contamination/residue rates below 3%
Tier 2: Achieve post sorting contamination/residue rates below 2%
Tier 3: Achieve post sorting contamination/residue rates below 1%
Paper/Paperboard <10% Moisture | Metal | “MRF Glass” | Plastic Bale Contamination | |
| Tier 1 | Outhrows + Prohibited: 60% of maximum allowed for each grade | 70% of maximum allowed for each grade | Non-glass residue & Fines < 6% |
|
| Tier 2 | 50% of maximum | 50% of maximum | <4% |
|
| Tier 3 | 30% of maximum | 30% of maximum | <2% |
|
Potential Strategies:
- Utilize contamination/residue rate calculation methodology in SWEEP Certification Manual
- Material grading of inbound material
- Inbound volume metric collection (for calculation)
- Sorting on the tipping floor
- Metering drums and conveyor speeds
- Film removal (vacuum)
- Manual sorting (pick line)
- Density sorting technology (ballistic separators, conventional disc screening, etc.)
- 2-D vs. 3-D sort
- Eddy Current (Aluminum)
- Magnets (Ferrous and other metals)
- Optical sorting (glass by colors, plastics by types, etc.)
- Sorted stream metrics collection
- Residual metrics collection