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

Overview

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.

(2) SHRED­DER
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.