In October 2017, ARB Process Engineering were awarded the EPC contract to deliver a 500kW (CHP) AD plant for Hewitt Meats. Electric and heat produced from the CHP unit, will be used for the day to day running of the meat processing facility. ARB Biogas designed the AD plant closely with Hewitt Meats to ensure their vision was understood correctly and implemented using the best possible products available to process their feedstocks.
Included in the design is a desulphurization unit to reduce the dependency on carbon, with out this step, biogas can cause aggressive corrosion of the plants equipment reducing its life span. A premix tank has been erected so the system can handle waste sufficiently and ensure appropriate preparation of the substrate prior to digestion.
Hewitt Meats wanted to reduce the volume of substrate needed to be transported away from the AD plant and have decided to install a Vapogant digestate evaporator. The Vapogant system will remove water from the digestate through vacuum evaporation using waste heat from the CHP. This process also bounds volatile nitrogen, minimising loss during distribution and making nitrogen available as ammonium sulphate solution (ASS). A highly concentrated liquid digestate is produced, reducing the costs of transport and storage.