Toronto Disco Road Details   

Background  

With the proven every day performance of the DOPF as the foundation, together with our strategic partners, AECOM Canada and Veolia Canada, we designed and built a second AD plant, owned by the City, to process 75,000 metric tonnes of SSO collected in their Green Bin Program. The facility received its first waste in December 2013 and reached full capacity in March 2014. Today, CCI provides daily operations, management and technical support.      

 

Today, the City collects over 130,000 metric tonnes of residential and commercial source separated organics (SSO) annually, of which up to 55,000 metric tpy are to be processed at the Dufferin facility in 2017 once the facility capacity has been expanded and the plant is at full capacity operations. Any remaining tonnage beyond the 130,000 tonnes will be sent to external composting processors and the plan is to repatriate it back into the internal City owned processing system sometime in the future.  The City expects to collect more than 175,000 metric tonnes annually once all of the 4,000 plus apartment buildings are implemented with the Green Bin. 

 

The City chose to construct the facility at the Disco Road transfer station, an urban location and one of seven in the City solid waste infrastructure.  It is integrated into the site operations and is physically built on an old landfill. More than 95,000 metric tonnes of material was excavated and sent for safe disposal using more than 3,300 truck trips. Over 900 steel pilings were then driven into the ground and filled with rebar and concrete to create the solid base required for foundation, building, tank and equipment loading. 

 

Document Link

Disco Road Fact Sheet

Processing Highlights

The facility operates two shifts daily, Monday through Friday, for receiving and processing of 300 tonnes per day, 250 days per year. The total plant staff compliment is 14 people, including the plant manager, administrator, lab technician, three maintenance staff and two 4 person crews. A person is on call each weekend and statutory holiday to monitor the plant and address any alarms or warnings. The composter does not receive materials on weekends and holidays. The digester solids trailers are staged on the tipping floor over the weekend and shipped the next processing day.

 

The waste feedstock, which is characterized by a high plastic content due to the collection in plastic bags, is directly fed to the BTA® Hydromechanical Pre-treatment system without any prior treatment. The configuration includes three waste pulpers and three grit removal systems to remove the inert contaminants and other non-digestible elements. The system is fed using a telescopic loader to fill a hopper that conveys the SSO to the pulpers, which have a load volume of about 15 metric tonnes.

 

The anaerobic digestion methodology implemented is a wet digestion process in the mesophilic range using two 5,300 m3 digesters with full mixing using compressed biogas. The plan for the continuously produced biogas is to cogenerate it to produce electricity and heat for the organics facility needs, the on-site transfer station, and the adjacent works yard to offset electrical and natural gas purchases. The first use of the biogas is to power the dual fuelled boilers to create the heat required for the digestion, biofilter, and waste water systems. 

 

The digestate is dewatered using two centrifuges, with the third installed as a stand-by unit. The resulting digester solids are then shipped for aerobic finishing at an off-site compost facility located about 100 kilometres from the plant. Due to the virtually non-existent inert contamination, the final high quality compost is Class AA and is distributed into the higher-value markets. All liquids inherent in the waste are reclaimed and reused as process water in the closed-loop process water system. Any excesses are treated on site in a biological effluent treatment system prior to discharge to the local sanitary sewer system.

 

The extracted inert contamination is dewatered, conveyed and loaded in trailers for landfill disposal City owned and operated site. Alternative uses for this material are being studied. The BTA® Process Control system monitors and controls all equipment, including subsystems such as the biofilter and the effluent treatment.

 

Disco Pre-treatment Installation
         Disco Tank Farm

Delivery Team Partners

The facility is designed, built and guaranteed by CCI and partners AECOM Canada, ES Fox Construction and BTA International. Initial operations commenced in December 2013 with CCI being a key member of the operating team that is led by Veolia Water Canada. Equipment and services delivered by CCI under this structure include:

 

  •  Delivery of the process design and facility layout 
  •  Advise & assist for basic and detail engineering
  •  Waste receiving designs & equipment
  •  Procurement, installation & warranty of the BTA® Waste Pulpers / Grit Removal System (GRS) / Process Control System
  •  Procurement & installation of the solids / liquids separation system
  •  Design of the reclaimed process water management loop
  •  Detail engineering of the digester, including non-mechanical mixing
  •  Biological effluent treatment system advise
  •  Commissioning, start-up & continuous daily operations
  •  Performance guarantees for throughput, biogas volume & quality, solids quality, odour control and waste water
  •  On-line monitoring & technical support

Community Level Value

The City plans to cogenerate the biogas produced from the anaerobic digesters to produce electricity and heat to offset the needs of the facility, the overall site, and the adjacent works yard.  Public consultation is complete and the plan is to have a system procured and installed before the end of 2016. As an alternative the City will explore in the future, the Disco and Dufferin facilities could produce enough biogas to create more than 9 million cubic metres of biofuels, which is enough to power the entire waste collection fleet. The added-value this facility delivers to Torontonians' includes:

 

  1.    Support Toronto’s waste diversion goals by diverting and extending City owned landfill life
  2.    Meet current and growing demands fuelled by the great success of the Green Bin Program
  3.    Increase processing capacity within City borders with reliable capacity
  4.    Produce community based bioenergy for local consumption and benefit 
  5.    Produce a high quality Class AA compost
  6.    Operate without odours or other off-site nuisances
  7.    Comply with the Toronto Green Standard
  8.    Create local economic growth in jobs, goods and services purchases & taxes

Toronto Green Bin Program Details

Toronto Dufferin Details