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Materials Recovery Facility (MRF) Processing Technologies Flashcards

6 cards from real CRP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the primary function of an eddy current separator in a MRF?

    Answer: To separate non-ferrous metals (especially aluminum) from the material stream using an electromagnetic field

    Eddy current separators create a rapidly changing magnetic field that induces electrical currents in non-ferrous metals, repelling them off the conveyor for recovery.

  2. What does an 'optical sorter' do in a modern single-stream MRF?

    Answer: Uses near-infrared (NIR) or visible-light sensors to identify and air-jet eject specific materials by type

    Optical sorters analyze the spectral signature of materials passing on a belt and use bursts of air to eject target materials into separate chutes, enabling high-speed automated sorting.

  3. What is the purpose of a 'trommel screen' in MRF processing?

    Answer: To separate materials by size using a rotating cylindrical screen with holes

    Trommel screens use rotation and gravity to sort materials by size — smaller items fall through screen holes while larger items are carried out the end, enabling effective size-based separation.

  4. What is a 'disc screen' (OCC screen) used for at the beginning of a MRF line?

    Answer: To separate large flat cardboard (OCC) from smaller mixed materials using rotating star-shaped discs

    Disc screens at the front of a MRF line use rotating discs to screen out large corrugated cardboard (OCC) at the start, preventing it from jamming downstream equipment.

  5. What is a 'glass breaker screen' designed to do in single-stream MRF processing?

    Answer: Intentionally break glass into small fragments that fall through screen openings, separating glass from other recyclables

    Glass breaker screens crush glass containers early in the process, causing fragments to sieve through screen openings and separate from containers, films, and paper that stay on top.

  6. What does 'throughput' mean for a Materials Recovery Facility?

    Answer: The volume or weight of material processed per unit of time, typically expressed as tons per hour

    Throughput measures MRF processing capacity (e.g., 25 tons/hour), which determines the facility's ability to handle contracted material volumes without creating backlogs.