Activated Sludge Systems and Modifications in Wastewater Treatment
Discover the workings of activated sludge systems in wastewater treatment, including maintaining biological mass, suspended growth principles, and important process types like tapered and step aeration. Learn about high purity oxygen systems and practical applications for efficient treatment processes.
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Presentation Transcript
Maintain an adequate biological mass in suspension within the reactor by mixing. In most processes, the bacteria is returned from the secondary clarifier in order to maintain a high solids concentration.
The principal of suspended growth system The basic factor in design, control, and operation of suspended growth system is (sludge age). For an equilibrium system Quantity of solids produced = quantity of solids lost
The explicit assumption of the model up are: 1. Waste utilization occur in the biological reactor. 2. Total biological mass in the system is equal to the total biological mass in the reactor.
Important type and modifications of activated sludge process Conventional process: Consist of a rectangular basin, a clarifier, andd a solid return line from the clarifier bottom.
Tapered aeration process: This process attempt to match the oxygen supply to demand by introducing more air at the head.
Step aeration process Distribute the incoming flow to a number of points along the basin
High purity oxygen system Using pure oxygen in treatment process. Two process configurations are available a. Closed reactor with high purity oxygen b. Open reactor with fine bubble diffusion at the tank .
