Model of Anoxic-Aerobic Wastewater Treatment at Phoenix 91st Avenue Plant.

摘要

The objective of this project was to develop a model that can be used to evaluate the design and performance of a multiple staged anoxic-aerobic wastewater treatment system. This type of system has general application, and was first used at the 91 st Ave. wastewater treatment plant in Phoenix, Arizona. The model simulates the concentrations of ammonia, nitrate, and nitrite in each of the stages of the ten-stage system, using a Microsoft Excel spreadsheet. The oxygen consumption rate is also computed in each stage. The staged treatment system performance was evaluated as a function of various design and operating parameters which include the effect of Solids Retention Time (SRT), the internal recycle flow rate and distribution, and aeration tank DO concentrations. Two models were developed for comparison. The first model was based on Michaelis-Menton kinetics. The second model was a modified version of the first model that takes into account soluble substrate uptake and storage in the initial stages.