material recovery facility (sorting plant)
DESCRIPTION
Material Recovery Facility (Sorting Plant). Stuttgart has 10 Material Recovery Facilities (MRFs). 3 sorting plants for packaging, commercial and demolition waste. 1 sorting plant for light weight fraction (packaging). 2 sorting plants for dismantling of WEEE. - PowerPoint PPT PresentationTRANSCRIPT
Rennes, November 2001 – ISWA / Cemagref
WP4AWAST
Material Recovery Facility
(Sorting Plant)
Rennes, November 2001 – ISWA / Cemagref
WP4AWAST
Stuttgart has 10 Material Recovery Facilities (MRFs)
3 sorting plants for packaging, commercial and demolition waste
2 sorting plants for dismantling of WEEE
1 sorting plants for construction and demolition waste
3 sorting plants for paper
1 sorting plant for light weight fraction (packaging)
Rennes, November 2001 – ISWA / Cemagref
WP4AWAST
There is no standard MRF process
Processing depends on:
• Kind of material to be sorted
• Separate collection
- how the material was collected (kerbside, bring system)
• Commingled collection
• Target for sorting (Recycling, RDF)
Rennes, November 2001 – ISWA / Cemagref
WP4AWAST
Material recovery facility
Rennes, November 2001 – ISWA / Cemagref
WP4AWAST
Two main separation principles:
Screening/ Separation according to sizesClassifying: (screening, air classification)
Sorting: Separation, using the physical character of the material (magnetic separation, ballistic, eddy current, etc.)
Rennes, November 2001 – ISWA / Cemagref
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Flow sheet of a MRF for Light Weight Fraction
Rennes, November 2001 – ISWA / Cemagref
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Large Rejects
Plastic films
Fe-Metals
Tetra Paks etc.
Rejects
Aluminium
PE - bottles
Mixed plastic
Paper/board
Cutting shredder
Air classifier
Magnetic separator
Eddy current separator
Roll bank NIR
Drum screen
Drum screen
Post-Sorting
Air classifier
Rennes, November 2001 – ISWA / Cemagref
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Input: Packaging waste
Reception area
Cutting shredder opens the waste bags
Rennes, November 2001 – ISWA / Cemagref
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Screening
Drum screens use a combination of rotation and screening
Rennes, November 2001 – ISWA / Cemagref
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Bucket screen
• operates like a large drum screen
• advantage: absolutely jam-free• in severe operating conditions
Coarse fraction
Fine fraction
Rennes, November 2001 – ISWA / Cemagref
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Inclined sorting machines
The Inclined Sorting Machine separates flat products from body-shaped products, inert material from non-combustible material.
Rennes, November 2001 – ISWA / Cemagref
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Ballistic separator
Separates light and heavy fractions depending on its physical differences (specific weight)
Consists of a movable and perforated slope which is distributed into several vibrating segments
Rennes, November 2001 – ISWA / Cemagref
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Air classifier
Isolates light plastic and paper from the packaging stream – facilitates further separation
Blower sucks air up through the throat, carrying light materials (paper, plastic) which then enter a cyclone separator where they loose velocity and drop out of the air stream
Rennes, November 2001 – ISWA / Cemagref
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To directly remove ferrous materials (tinplate cans or tin lids)
• floor-mounted
• or suspended by support beams over a moving conveyor belt
Magnetic separator
Rennes, November 2001 – ISWA / Cemagref
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Eddy current separator
High-frequency oscillatory magnetic fields induce an electric current in the conductive object
• separates conductive but nonferrous metals• from lightweight commingled waste
• usually performed near the end of a separation• process
• useful for separating aluminium from plastic mix
This electric current generates a magnetic field, which causes the object to be repelled away from the primary magnetic field
Rennes, November 2001 – ISWA / Cemagref
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Manual sorting
Manual picking stations line one or both sides of the moving conveyor belt
Each picking station usually is devoted to one type of recyclable material
System is less capital intensive but it is labor-intensive
For workers health manual sorting must be capsulated
Rennes, November 2001 – ISWA / Cemagref
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Plastic sorting
Automatic sorting by Near Infrared Technique (NIR)
Position and material characterisation are scanned per Infrared
Sensors notice the different reflections by the different plastics
Computers analyse the data and direct blast pipes which remove the plastics pneumatically from the belt
Rennes, November 2001 – ISWA / Cemagref
WP4AWAST
Sorting of Light Weight Fraction and Paper in Augsburg