1. What is the role of aeration in sewage treatment
▶ In sewage treatment, aeration equipment supplies oxygen to the aeration tank through aeration, and also has the function of mixing and stirring to enhance the mass transfer conditions of pollutants in the water treatment system and improve treatment efficiency.
▶ Generate and maintain effective air-water contact, and maintain a certain dissolved oxygen concentration in water while continuously consuming oxygen through biological oxidation.
▶ Generate sufficient mixing and water circulation in the aeration zone.
▶ Maintain sufficient velocity of the liquid to keep the biological solids in suspension in the water.
2. Characteristics of sewage aeration system
▶ The input of sewage is a random variable, and its external environment has many uncertain factors, making it difficult to establish an accurate mathematical model for the aeration biological system.
▶ The parameters of the aeration system are high-dimensional, strongly coupled, and highly nonlinear.
▶ Dissolved oxygen has a large time delay, making it difficult to reach system equilibrium in a short period of time.
▶ A large number of skilled operators' practical experience and knowledge are required in sewage treatment processes.
▶ The stability and uniformity of aeration flow distribution are the basis for controlling treatment efficiency and energy conservation.
3. Improvement suggestions
1) Resolve the balance and stability issues of air flow in the aeration tank
2) Seeking control strategies suitable for dissolved oxygen to control air flow rate
