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What Stages Make Up a Material Recovery Facility?

  • Starter
  • Article
  • Ages 10+
  • 5 min read
A bright sorting hall with conveyors, a perforated screen drum and tied paper and metal bales at dispatch.

A materials recovery facility works in three stretches: clearing and feeding, machine sorting, then checking and baling. According to the Wasatch Integrated Waste Management District, describing a real facility, recyclables are inspected on a tipping floor, pass through screens and separators, and are then pressed into bales for delivery to market.

Contents
Material passes through a row of machines, one job each, and ends as a bale.
  • Feeding
  • Screening
  • Identifying and separating
  • Baling

What you will learn

  • List the stages in order from the tipping floor to the baler.
  • Say what each group of machines does in the line.
  • Understand why baled material is bought and sold like a raw material.

Before you start

You only need to know that collected recyclables are trucked to a recovery facility. This article describes one specific facility; others may order things differently.

How is material cleared and fed into the line?

The start of the line is about clearing large items and feeding evenly. On the tipping floor, the loader operator inspects what has arrived and removes items that cannot be recycled, such as tires, string lights and hoses. The infeed conveyor then feeds material into the system at a uniform, metered rate.

At the presort conveyor, sorters pull off large clean cardboard. They also remove items the system cannot process so they do not jam the line.

The start of the line: large items are picked out and the rest is fed evenly onto the conveyor.
  • Tipping floor
  • Item picked out
  • Infeed conveyor

Which machines split and identify the material?

The middle of the line holds the machines that split material by size, shape and kind. Rotary screens remove the oversize part. The disc screen divides flat from round. Optical sorters identify materials with sensors. Magnets take ferrous metal, and the eddy-current separator takes nonferrous metal such as aluminium.

Each machine does one job; after the stream branches, each branch goes to the next appropriate machine. Other articles in this topic go into each machine.

Where does material go after sorting?

It gets a last check, a cardboard screen, a holding bunker and then the baler. A quality-control sorter stands by the conveyor to remove contamination before the material enters storage bunkers. A screen separates cardboard from other fibres, containers and debris. Recovered material sits in bunkers before baling, then is pressed into bales and tied for delivery to market.

According to the US EPA, recyclables are bought and sold just like raw materials, and prices go up and down with supply and demand.

The end of the line: check, hold, then press into bales.
  • Quality check
  • Storage bunker
  • Pressed bales

Real-world example

Follow an aluminium can through a hypothetical walk-through, since every facility arranges its machines differently. The can arrives on the tipping floor, is fed onto the conveyor, passes the screens, is taken out by the eddy-current separator, goes past quality control, waits in a bunker and is pressed into a bale with many other cans.

Common misunderstandings

A recovery facility does not wash everything and then sort it. The machines handle the right kinds of recyclables, and what cannot be processed is removed at the start of the line.

Human checks remain. The line has sorters at the presort conveyor and a quality-control sorter near the end.

Frequently asked questions

What does a materials recovery facility do?

It sorts, cleans and processes collected recyclables into materials that can be used in manufacturing.

What is a bale?

A block of recovered material pressed together and tied for delivery to market.

Who checks quality at the end of the line?

In the facility described, a quality-control sorter stands by the conveyor and removes contamination.

Summary

  • The line starts with clearing large items and feeding material evenly.
  • Machines split by size, shape and kind, each doing one job.
  • The end of the line is quality control, storage and baling for delivery to market.

Terms in this article

English and Vietnamese terms, with the meanings used here. Hover, tap or Tab to a term with a dotted underline for an explanation as you read.

tipping floorsàn tiếp nhận
Where recyclables are first dropped off and inspected at a recovery facility.
presort conveyorbăng tải tiền phân loại
A conveyor with sorters on each side who pull off large and unprocessable items.
storage bunkerkho chứa
A holding bay for sorted material before baling.
balermáy ép kiện
A machine that presses recovered material into blocks and ties them.
balekiện
A pressed, tied block of recovered material ready for delivery.
recovery facilitycơ sở thu hồi
A facility where collected recyclables are sorted, cleaned and processed.

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Sources

These sources are written for older readers. If they feel hard, read them with an adult.