The effects of hydraulic surges on sludge mass distribution



Journal Title

Journal ISSN

Volume Title



A new wastewater treatment plant is being planned for the City of Houston (Texas). The new plant, known as the 69th Street Wastewater Treatment Plant, will have the capacity to handle anticipated flow rates up to 400 million gallons per day. There are virtually no means of controlling the quantity or quality of the incoming wastewater and, consequently, the new plant will be subject to widely fluctuating inputs. The two-step oxygen activated sludge process has been chosen for high efficiency removal of pollutants. An important consideration for design is the dynamic behavior and operational characteristics of the biological treatment units during the expected short-term hydraulic fluctuations in influent flows. This investigation describes the development of a mathematical model for simulation of transient hydraulic peaks in the two-step oxygen activated sludge process. Several simulations were performed using a specialized computer program. The results were analyzed and were used to aid in design of the treatment system. Various control actions were, simulated to define the most promising control strategies.