Savings on the costs of your waste. Bones, fats and meat waste can make your waste container unnecessarily heavy.
The collection of food waste is an everyday fact at food producers, in the hospitality industry and in small & medium enterprises; whether this concerns meat and fish waste, used frying oils or by-products from slaughter, ReFood makes sure that the collected organic waste is converted in our own biogas plants into sustainable energy and fertiliser for farmland.
Whether the waste is packaged or unpackaged - ReFood collects food waste and processes it into biomass. The containers are emptied in the arrival hall and the food waste is broken up using a hammer mill. This separates the packaging components, including carton and film from the organic material.
A heat exchanger is used to transfer the heat from the cogeneration unit to the organic mass, which is pre-heated to some 45 degrees Celsius. The hygienisator then heats the biomass in accordance with EU regulation 1069/2009 to over 70 degrees Celsius. This temperature is maintained for an hour to neutralise any potential pathogens.
Heavy interferants such as tin and glass splinters as well as bone waste, hard plastic and aluminium are separated via gravity in a hydrocyclone. This means that the digestate, as end product of the fermentation, is free from interferants.
ReFood degreases the food waste in a decanter centrifuge. The edible fats obtained in this way are then cleaned: water and contaminants as well as polyethylene are removed in various filtration systems, to produce a pure raw material. These edible fats, like the used edible oils that are collected in the Oleo90 containers, are delivered to biodiesel producers.
The biogas plant digesters separate the micro-organisms, carbohydrates and protein from the degreased waste and foods into simple organic elements such as peptides or fatty acids.
Temperature and pH value play an important role in this. Millions of bacteria convert the intermediate products over multiple stages into acetic acid and ultimately into methane (biogas). After desulphurisation and cleaning, the biogas is used in cogeneration units to generate electricity and heat.