Dalluaine Distillery, Speyside, Scotland
Diageo is the world’s leading premium spirits company and the largest distiller of Scotch Whisky, with 28 malt distilleries and one grain distillery in Scotland, all producing the highest quality spirit for brands such as the world’s number one selling Scotch Whisky, Johnnie Walker.
Along the river Spey at Diageo’s Dailuaine Distillery the company invested £6million to create a new bioenergy plant which uses an aerobic digestion technology to treat waste water. The use of AD technology to produce electricity for use on site is a first in malt distilling, putting Dailuaine at the cutting edge of renewable energy innovation.
The plant uses the liquid residues from the distillation process to generate bio-gas that is then used in a Combined Heat & Power (CHP) plant to generate electricity and steam which is used to power the onsite distillery and dark grains plant.
The plant generates 0.5 MW of biogas, providing 40% of electrical demand for the site and reduces CO2 emissions by 250 tonnes. At the end of the process all that is left is clean water which can be discharged without any environmental impact and solid bio-fertiliser which are used by farmers.
The investment in green technology at the site helps to contribute to 50% of the distillery company’s power requirement coming from renewable energy.
A high efficiency Ylem Energy CHP system and a Byworth Waste heat steam boiler convert the biogas into steam and electrical energy.
These two energy streams dramatically reduce the distillery’s reliance on the use of fossil fuel based energy inputs from the national gas and power grids.
The CHP is a Perkins reciprocating biogas engine specifically designed to run on biogas with a methane content of around 60%.
The shaft of the engine is connected to a low voltage generator, generating three phase 415 volts 50Hz renewable electrical power to be utilised on site.
Anaerobic digestion can be applied into a multitude of industries for various types of biological by-products and wastes :
Trade effluent from food and beverage manufacture with COD loads of over 3000kg per day
Solid food wastes with dry matter contents between 3-80% dry matter
Food offcuts and non conforming food production whether de-packaged or contaminated
Farm manures and dung
Energy crops like whole crop - rye, energy beet, grass silage, maize silage.