Aerated granules for carbon, nitrogen and phosphorous removal using a bench scale sequencing batch reactor

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Wastewater treatment in Canada is currently undergoing a period of revision wherein stricter regulations have come into force or will come into force over the next several years. Specifically, industrial wastewater, in particular food and beverage wastewater, is characterise by high ammonia and phosphorous concentrations Both ammonia and phosphorous cause deleterious impacts on the receiving aquatic systems; ammonia results in both acute and chronic toxicity issues, including fish death, and phosphorous leads to eutrophication that may results in algae blooms, loss of dissolved oxygen with the potential for fish death as a results as well. The food and beverage industry produce effluents with high carbon, total nitrogen and phosphorous concentrations. The high concentration of carbon, nitrogen, phosphorous and the ammonium nitrogen (60 to 270 mg/L) could cause considerable toxic effects to aquatic life and might pose the risk of eutrophication. Biological treatment is the most common and economical means of carbon and ammonia removal from wastewater in Canada and throughout the world. However, conventional suspended growth aerobic or anaerobic biological treatment systems might not be capable of treating food and beverage industry wastewater with the these high carbon:nitrogen:phosphorous ratios. An aerobic granular sludge processes has the potential capacity to treat high organic loading rates and simultaneously removes nutrient through nitrification, denitrification and microbial phosphorous accumulation in a single reactor; however the application of this innovative technology to treat the food and beverage wastewater is not fully explored. In particular information on the start-up operation and performance of aerobic granules in the food and beverage wastewater is scarce. Thus, this research project is aimed at providing environmentally sustainable wastewater treatment options by investigating the aerated granular SBR startup operation, removal rates of carbon, nitrogen and phosphorous to develop a strategy for the development and maintenance of stable aerated granules for nutrient removal at the lab scale with future collaborative work aimed at pilot scale testing.