Pellet Plant Function
Non-engineered MSW at 5,000 Btu/lb Engineered pellet Fuel Pellets at 10,000 to 12,000Btu/lb
Overview of the Process
The pelletization process of residential/ commercial MSW is an environmentally compatible alternative way of dealing with the problematic waste disposal issues, presently facing municipalities throughout North America. The primary objectives of this process are to reduce the transportation of significant volumes of MSW to landfill, reduce the volume of methane gas released into the atmosphere – a major contributor of greenhouse gases and to redirect significant volumes and weight of non- hazardous MSW streams that are presently disposed of in a landfill into an _environmentally_acceptable_fuel_product_ ,trademarked as Pellet, that can be used for the beneficial use of energy consumers currently dependent on coal, oil or even natural gas.
In contrast to the current typical approach of disposing of all non hazardous MSW by trucking it to a local “transfer station”, separating it and then trucking it again to the designated MSW landfill, often hundreds of miles away, for disposal, this technology employs a patented recipe and process that significantly reduces the volume of MSW that must ultimately be landfilled. Under the Themis process, up to 98+% of all recyclable materials can be recycled. This allows the significant balance of the waste stream to be positively selected, combined with other high BTU admixture products, such as poly film, and converted into high-density, high BTU pellets. This environmentally compatible process significantly reduces the number of large over-the-road diesel trucks used to haul the MSW to landfills, thus reducing truck emissions, into the atmosphere by landfills, a major source of greenhouse gas emissions.
Plant Control System
The plant design incorporates a fully interlocked control system monitored from a central control room within the plant. This system also incorporates all necessary monitoring devices within the plant operating system to ensure that any dust is removed from the plant atmosphere. The system is fully interlocked with Programmable Logic Controllers (PLCs) to control all of the safety devices such as photo-cells, limit switches and flow switches. The PLCs are set up to control the start up and shut down sequences. The component parts of the system are tied into a Distributed Control System (DCS) and controlled by the main computer.
The Hydraulic Press Run – Off System
All water from MSW and wash-down systems is collected and stored. The water is then biologically treated and, to the greatest extent permissible, reused for cleaning the plant floor and equipment. Solids in the holding tank are extracted regularly and, if appropriate, re- incorporated into the pellet production process. ††
Biological Air Filtration System
A bio-filtration system has been installed to ensure air exhausted from the facility has odour control prior to exhaust to atmosphere. The plant ventilation system provides an average of four (4) air changes per hour of fresh air, with six (6) in high odour areas, to maintain a negative pressure within the plant to control odours within the confines of the facility walls.