Maximising the benefits of renewable energy continues to be the focus for an increasingly diverse range of companies who are continuing to invest in the anaerobic digestion (AD) process and a new bio-energy plant at the Glendullan distillery is a good example. Diageo Scotland Ltd, have a number of distilleries in the ‘Whisky Trail’ area located in Speyside, Perthshire and have invested around £1bn in increasing production capability and enhancing their bio-energy facilities.
Mixing is an essential part of the AD process and SYSTEM MIX LTD who market the Rotamix Dual Zone Mixing System, have made an important contribution in supplying mixing equipment to both the Dailuaine and Glendullan distilleries. The mixing system installed at the Dailuaine Bioplant consists of a single Vaughan HE10R12-381 horizontal end suction chopper pump driven by a 37 kW rated motor and 4 internally floor mounted double nozzle assemblies to mix a 24.5m diameter digester tank. The success of this initial AD project was an important factor in the decision to upgrade the Bioplant at the Glendullan distillery, where another single pump mixing system is operating successfully.
Production residues such as spent grains and pot ale form the bulk of the materials which are fed into the bioplants which ultimately produce outputs of bio-gas of up to 500 kWe CHP and are used to power the distilleries.
As the sole UK suppliers of the bespoke design ROTAMIX (Digester Mixing) and STM (Small Tank Mixing) tank mixing systems using the integral VAUGHAN chopper pump, System Mix are making an important contribution to the success of AD plants in the ‘food’ waste sector. Operators are benefitting from their technology and experience resulting in their involvement in many ‘retrofit’ projects where existing mixing systems (or lack of them) were contributing to operational and biological issues.
For example, problems such as solids settlement are commonplace reducing active digester volume and can result in a significant reduction in output, leading to failure of compliance requirements. Also compressors in ‘traditional’ gas mixing systems and submersible in-tank propeller systems are often associated with labour intensive maintenance issues, resulting in process downtime and associated costs.
Andy Parr, Director at System Mix comments: “Today AD operators need to maximise the sustainable credentials of their plant and equipment even further and we are confident that the benefits of our mixing systems are becoming even more relevant and important”.