Green waste is delivered on site to Lower House Farm by local authorities, or independent parties. The in-vessel composting (IVC) process mixes organic material, including food waste, under strictly-controlled environmental conditions within a sealed and fully enclosed purpose-built bunker. The waste is filtered, shredded and formed into windrows (piles) which are regularly turned for a period of 8-12 weeks to improve porosity and oxygen content and to redistribute moisture pockets. Its left to decompose under regulated temperature conditions. During this period the green matter will reach temperatures of over 60°C ensuring complete breakdown and sterilisation.
The organic material passes through a robust custom-built screening process to remove any further stones, plastic and other unwanted items to create a fine British standard PAS100 certified compost.