Materials Recovery Facility (MRF) Processing Technologies Flashcards
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Read the first 6 Materials Recovery Facility (MRF) Processing Technologies flashcards as text
What is the purpose of a 'baler' in MRF operations?
Answer: To compress sorted recyclable materials into dense, uniform bales for efficient transport and storage
Balers compress sorted materials like OCC, plastic, and aluminum into compact bales that are easier to store, transport, and sell to end-market buyers.
What is a 'ferrous magnet' used for in a MRF, and what materials does it capture?
Answer: An overhead or pulley magnet that removes steel cans and other iron-containing metals from the conveyor belt
Overhead magnetic separators pull ferrous (iron-containing) metals like steel food cans off the conveyor, while non-ferrous metals like aluminum pass through to be recovered by eddy current separators.
What does 'residual rate' mean in MRF operations?
Answer: The percentage of incoming material that cannot be recycled and must be sent to disposal
Residual rate measures the proportion of incoming material that the MRF cannot recover as a marketable commodity, reflecting processing efficiency and incoming stream quality.
What is the advantage of 'near-infrared (NIR) spectroscopy' in plastic sorting at a MRF?
Answer: It identifies specific plastic resin types by analyzing the unique spectral signatures of their molecular bonds
NIR sensors detect the unique infrared absorption patterns of different polymer chains, allowing the system to distinguish PET from HDPE from PP without relying on resin codes printed on items.
What is a 'ballistic separator' used for in a MRF?
Answer: To separate 2D (flat) materials from 3D (hollow/rigid) materials based on how they bounce and roll on a vibrating screen
Ballistic separators use vibrating paddles to cause flat materials (paper, film) to move one direction while 3D containers (bottles, cans) roll the other direction, enabling efficient separation.
In MRF operations, what is 'downtime' and why is it a critical operational metric?
Answer: Periods when equipment is not operating due to jams, maintenance, or breakdowns, which directly reduces daily throughput and revenue
Equipment downtime reduces the tons processed per shift, increases labor costs per ton, and can create material backlogs, making downtime minimization central to MRF profitability.