Dissolved Oxygen Model, Vapor Pressure, Evaporation Lagoon, and Flotation Post Aeration

This chapter introduces (a) mathematical models of evaporation, vapor pressure, and dissolved oxygen (DO) in fresh and saline waters under any temperature or pressure; (b) evaporation lagoon application and analysis; (c) stream water quality control, reaeration, and dissolved oxygen analysis; and (d) five post aeration technologies: diffused post aeration, mechanical post aeration, cascade post aeration, U-tube post aeration, and flotation post aeration. The authors highly recommend the adoption of high-rate dissolved air flotation (with only 3–5 minutes detention time) for final clarification in a wastewater treatment plant (WWTP) because the residual DO in DAF/WWTP effluent is higher than 5 mg/L at all time, thus the flotation post aeration is already included without extra effort.