EDCO, Lemon Grove, California, has updated its C&D recycling facility to assist local jurisdictions in diverting more waste from landfills and achieving long-term zero waste goals. The facility has been operating since 2006, processing 1,000 tons per day of construction debris and achieving landfill diversion rates of 72 percent. The company added new equipment in early 2019 to help boost diversion rates to 78 percent by 2020, in accordance with new California state mandates.
The existing system and facility upgrades were supplied by Van Dyk Recycling Solutions (VDRS), Norwalk, Connecticut, and includes several C&D sizing screens and three air density separators. The air density separators automatically sort material into various fractions, and an optical sorter identifies and ejects wood from the stream. New equipment also includes a shredder to downsize bulky debris and prepare it for sorting and multiple magnets to remove nails and other ferrous metals. The upgrades are projected to increase efficiency and overall diversion quality, VDRS says.
The upgrade accomplished various targets, such as increasing the plant’s processing capacity from 30 tons per hour to 70 tons per hour. The size reduction process results in pieces smaller than 3 feet, creating a more homogeneous infeed material that is easier and safer to sort manually and automatically. Size reduction also liberates materials, enabling much easier separation downstream, the equipment supplier says.
Material is sorted by size into four fractions: material 3/8 inches and smaller, 3/8-inch-to-2-inch material, 2-inch-to-12-inch material and material 12 inches and larger. Only light materials larger than 12 inches will be sorted manually, VDRS says. Air density separation enables automated separation of inerts, wood, ADC alternative daily cover (ADC) and light fuel feedstock. Additional fine screening and air separation allow for more effective separation of clean dirt and fines.
To improve cleanliness and visibility on the plant grounds, EDCO also purchased a new product from VDRS called BeeFoam, a dust suppression system that uses a formula that binds to materials to weigh down dust without making particles too wet. Material (even fines) can be properly separated for almost two weeks after a single application, the supplier says.
EDCO estimates a 50 percent reduction in on-site dust since installing BeeFoam. In addition to the BeeFoam solution, EDCO has installed a network of dust suction pickup points that recirculates air through three independent dust collection filters and captures airborne particles in enclosed bag houses with clean air exhausts.