Abstract
A comprehensive investigation of wastewater treatment operation is provided through utilization of a validated dynamic model, historical data from a real plant, and bifurcation theory. Bifurcation analysis was carried out with wastewater flow rate, stormwater flow rate, airflow rate, water temperature, and influent ammonia concentration as the free parameters. A two-parameter continuation using airflow rate and water temperature simultaneously was also performed. Results indicate an overall robustness of the plant toward disturbances, which comes at the cost of excessive energy usage. Even then, transients caused by those disturbances are inevitable and can cause violations of regulatory permits on effluent ammonia and dissolved oxygen concentrations. Another important finding is the excessive air usage in aeration tanks, which can be cut by 50% on average without affecting the effluent quality.
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