Short Project Description
Davidson Environmental, a waste management company, collects food-waste from restaurants and outdated packaged food from retail stores in Ontario. The waste is collected in 600l boxes. At Davidsons facility it is prepared for recycling in a biogas plant using a FINSTERWALDER compact depacking plant. The waste is dumped into a hopper, coarsely preshredded with a 4-shaft shredder and distributed to the two BS20 separation presses. The filling of the presses is supported by two filling devices. By squeezing hard components larger than 12 mm (mainly non-fermentable impurities) are separated from organic substrate, which is loaded into a truck by two piston pumps KP10. The impurities are pushed into a container and transported off site. The process does not require any additional liquid, and the energy content of the organics per m³ is correspondingly high. The throughput of the plant is approx. 8-10m³/h. The plant was pre-assembled in Germany and delivered in 3 parts in a sea container.
Integrated FINSTERWALDER Technology
1x compact preparation plant KA01 consisting of:
- Receiving hopper with screw conveyor
- shredder 4-shaft
- 2 x press filling device
- 2 x separation press BS20
- Hydraulic power unit for two separation presses
- 2 x piston pump KP10 with hydraulic power pack
- Steel construction and platforms
- 2 x switch cabinet and control system
Waste Treatment Process
Flow Sheet in Detail
(1) RECEIVING BUNKER
At Davidsons facility the filling of the receiving hopper is done by a forklift truck. Up to six 600l boxes can be emptied into the hopper.
The 4-shaft shredder with 2×11 kW connected power is fed via a 400mm spiral conveyor. The blades open the packaging and coarsely pre-shred the waste.
(3) CROSS-DISTRIBUTOR AND PRESS FILLING DEVICE
Below the shredder, the material is distributed into the separation presses via the two press filling devices. In each press filling unit, three conveyor screws push the waste into a separation press to ensure good filling and high throughput.
(4) SEPARATION PRESS BS20
The two BS20 separation presses installed side by side separate the organics from the impurities via a 12mm screen. The impurities are pushed out through a DN200 pipe to the front into a container. The organic matter flows downwards and collects in a trough.
(5) HYDRAULIC POWER PACK
The presses are driven by a 30 kW hydraulic power pack with two axial piston oil pumps. The power unit is located on a steel platform and was completely piped and pre-assembled in Germany.
(6) PISTON PUMP KP10
The two piston pumps KP10 together convey 9 m³/h organic matter <12mm with a maximum of 6 bar delivery pressure via a DN100 pipe into a truck. These pumps are each driven by a 5.5 kW hydraulic power packs.
(7) CONTROL CABINETS AND PLC
The plant is controlled via two control cabinets. These are located directly at the plant. The plant runs in automatic mode and can be serviced via a remote maintenance router.