On-Site Industrial Wastewater Treatment
Royal Canin Canada Company, Guelph, Ontario, Canada
|Owner||Royal Canin Canada Company|
|Location||Guelph, Ontario, Canada|
|Gross Floor Area||N/A|
When Royal Canin Canada selected Carl A. Nelson & Company to be design-builder for a new pet food production plant, regional quality control lab and corporate office on a greenfield site in a rural area near Guelph, Ontario, not served by a rural or municipal sewer and water system, one of the major challenges posed by the project was the handling of wastewater.
Building mechanical systems included potable and process water. All wastewater is treated on-site and discharged through a leach field. Due to the environmental regulations in Canada, it is required to treat the wastewater to drinking water standards.
To minimize treatment requirements, Carl A. Nelson & Co. designed a 5,300 GPD process waste treatment system to separate the wastewater from the plant into 2 streams (process & sanitary). The system included dissolved air floatation, sequence batch reaction, nitrification and denitrification, sand filtration, and a leach field disposal system. The process waste went through the entire treatment process while the sanitary waste only went through the final sand filtration.
The treatment process is a batch system consisting of 4 stages:
- Conventional pre-treatment by physicochemical treatment.
- Biological treatment by SBR with special concept for nitrification and denitrification. This stage is a four-zone process as follows:
- Contact Zone (to avoid development of filamentous bacteria)
- Aerobic Zone (to first treat carbon and then second to treat NH4+ and Norg)
- Denitrification Zone (to eliminate NO3 and NO2)
- Clear Water Zone (to obtain constant outlet flow) – this is where the sanitary waste gets introduced into the process.
- Final Sand filtration – from here the flow goes to a leach field tank/pump station where the flow is pumped to the leach field.
- Sludge Storage – This included aeration to minimize fermentation problems. This is a large manhole to hold sludge for a period of time and is periodically pumped out by a pumper truck.
Additionally, fresh water is supplied to the plant through a well and water treatment system built by Carl A. Nelson & Company.Learn More About Royal Canin Canada Company.