Anaerobic Digestion is considered to be the gold standard of food waste recycling.
As the providers of the first dedicated commercial food waste collection service to Anaerobic Digestion (AD), through our Eco-Eating brand, the use of AD forms an integral part of our food waste recycling technologies. Anaerobic Digestion offers food waste producers a zero waste to landfill solution, cost savings on expensive landfill and incinerator costs, and impeccable green credentials to customers.
Anaerobic Digestion (AD) is a natural biological process using naturally occurring micro-organisms to break down organic matter into a valuable fertiliser whilst producing biogas. By processing the waste through AD when compared to landfill, we are preventing the emissions of 905kg of carbon per tonne of food waste being emitted to the atmosphere.
Food waste is collected by Cawleys and taken to an Anaerobic Digestion plant, within the locality of your site, where it is depackaged. The waste is then mixed with crop silage or animal manure, which breaks down the food waste into fertiliser whilst producing biogas. A combined heat and power (CHP) engine is used to convert the biogas into electricity and heat, which is fed back to the national grid and the fertiliser can be spread on the land to grow new crops.
By processing food waste through AD rather than sending it to landfill, you will be preventing the emissions of 905kg of carbon per tonne of food waste from being emitted to the atmosphere, which is the equivalent of taking 12 cars off the road for one month.
In-Vessel Composting, the second string to our food waste recycling bow, means Cawleys can ensure sensible ‘recycling miles’ for customers that are not within the catchment areas of an AD plant.
Food waste is composted in metal tanks or concrete bunkers in which air flow and temperature can be controlled. The air circulation is metered in via buried tubes that allow fresh air to be injected under pressure. This produces compost which can be used as fertliser on the land.