Rothsay, a division of Darling Ingredients Inc., and based in Guelph, Ontario has roots in the Canadian rendering industry extending over 50 years. As Canada’s largest renderer, Rothsay employs over 500 people, providing essential services for the efficient and environmentally responsible management of collecting, processing, and recycling animal by-products and used cooking oil into valuable animal feed ingredients and biodiesel fuel. Rothsay recycles more than 99% of what it collects, providing vital services to the food and agricultural industries, while reducing GHG emissions through the production of renewable fuel and the diversion of hundreds of millions of kilograms of material from landfill annually.
Rothsay serves farmers, food producers, and consumers by providing an essential and environmentally sustainable means of adding value to what otherwise would be discarded. The products that Rothsay creates, such as biodiesel fuel, provide additional environmental benefits such as reducing fossil fuel consumption.
Rothsay is continuing to grow its essential role in society by expanding the types of materials it collects and recycles to include food residues from commercial and industrial sources, grease trap material and more. Ultimately, Rothsay’s future lies in it being an integral part of agriculture and food production where it gets its input materials, but also with the energy complex that it is part of.
Rothsay is unique among recyclers in the degree to which it benefits its customers and society. The customers from which it collects materials to be recycled benefit directly through reduced disposal costs. The customers to which it sells finished products customers benefit from high-quality animal feed and fuel. Society benefits from Rothsay’s 99%+ recycle rate, GHG mitigation benefits and landfill use reduction.
Rothsay was a pioneer in biofuel production by launching Canada’s first commercial-scale biodiesel plant in 2005, one of only a handful in the world able to run recycled feedstock such as rendered fat and used cooking oil.
Rothsay is a proud user of its own biodiesel, using hundreds of thousands of litres per year in its own truck fleets.
Consistent with its message of sustainability, Rothsay has robust wastewater and odour treatment systems. For example, Rothsay operates the two largest closed biofilters in North America for the biological treatment of odours.