NO NUISANCE ODOURS
Turning organic waste into renewable resources has big environmental benefits, but managing odours at composting facilities takes skill, science and specialized equipment.
Watch the video to learn how the Surrey Biofuel Facility was designed to deliver all the benefits of an organics processing facility, without any of the smell.
Our world-class odour abatement system starts literally at the front door as a sophisticated negative air pressure system draws air into the facility when the loading doors open to admit the waste collection trucks. The system extends to the entire building and contains 100% of the composting odour.
Once unloaded, the organic material is deposited into specially designed anaerobic digestion or composting tunnels. Each tunnel is sealed with a gas tight door. Inside the tunnels, carefully controlled amounts of air and water support microorganism colonies in the process of transforming organics into compost and biofuel. Ammonia is released during the decomposition process and ammonia gas is the primary source of the bad smells associated with composting.
As the air is expelled from the tunnels, it is channelled first through an ammonia scrubber, where sulphuric acid reacts with ammonia to produce Ammonia Sulphate. The Ammonia Sulphate is recovered and used as fertilizer. Next, the air is cooled to less than 40° and humidified by a counter current water spray. Once cooled and suitably saturated, the air passes through a woody bio-filter where another group of microorganisms are used to absorb remaining odours. Finally, the air is sent up the vapour stack and is rapidly dispersed 70m (20 stories) above the ground. Odour control at the Surrey Biofuel Facility is monitored continuously using E-nose technology.
The Surrey Biofuel Facility vapour stack is so tall it is subject to marking and lighting requirements under Canadian Aviation Regulations.
Abatement means to decrease or diminish. The Surrey Biofuel odour abatement system diminishes the level of detectable odour to one Odour Unit per cubic metre OU/m3.
The definition of one odour unit is the lowest odorant concentration at which 50% of noses cannot detect the odour and 50% can. This is called the Detection Threshold or the Perception Threshold.