Keep it Clean

An air-cleaning system is vital to keep dust at bay in a WEEE scrap shredding facility.

November 9, 2009
One important thing I have yet to mention is the air-cleaning system.
As all of you know, all of this equipment has come from homes or offices, some even from landfills, and is loaded with dust and dirt. The slow-speed shredding system is not going to create much dust, but it will free up the dust and dirt that was in the electronics. You have to collect it by installing one to three air-filtration systems with duct work coming from the top and bottom of the shredder and from any vibrating shakers that free up the dust and from transition points where the material falls. The air system has to be large enough to act as a vacuum cleaner. A good HEPA (high-efficiency particulate air) filter must be attached to the discharge side of the air system. The air coming out of the HEPA filters is cleaner than the air going into the plant.
A good system is going to cost $70,000 to $85,000 each, depending on the size and volume of material you are shredding every hour. A very large system shredding 20,000 pounds per hour will require at least two large air filter systems.