Wastewater Storage-Simulation of Instream Effects

Simulations using computer models to predict the instream effects of storing wastewater during periods of low streamflow and releasing during periods of high streamflow indicate that instream dissolved oxygen concentrations can be increased during low flow periods to a level necessary for fish and aquatic life survival. Equations relating allowable wastewater flow at a given effluent quality, streamflow, and temperature were developed as a guide for operating a wastewater storage pond. Without the storage pond in operation, instream dissolved oxygen concentrations were predicted to drop below that necessary for fish and aquatic life survival. With the storage pond in operation, the instream dissolved oxygen concentration was predicted to remain above 3 mg/l, indicating that wastewater storage is an alternative that should be considered when examining situations of low streamflow and high wastewater loading.