Ashbridges Bay Sewage Treatment Plant, Toronto, Ontario - Case Study
ABOUT THE PROJECT
Biorem has successfully demonstrated its high rate odour control system for biosolids exhausts at Ashbridges Bay sewage treatment plant in Toronto, Ontario. The demonstration used XLD™, a biofiltration media engineered specifically for biosolids odours. The system has achieved 95% odour removal in less than 20-s Empty Bed Residence Time (EBRT) despite high concentration of organic sulphur compounds (OSC), and has proven its effectiveness over more than 2 years of operation. OSC removal efficiencies were measured to be 95% and higher at EBRTs of 15 s or less. Biorem’s experience with organic media and other inorganic media shows this to be a significant performance improvement, reducing EBRT by as much as 50% for equivalent or better performance. A novel horizontal flow approach was used, which permitted the use a 2.8m high biofilter bed and incorporation of humidifier in the same vessel, resulting in up to 70% footprint reduction. However, the more common vertical flow approach is just as valid, and the key to superior performance is selecting processes and biofiltration media suited to a given application.