Which type of activated sludge configuration has two aeration basins per single treatment unit?

Study for the Texas Wastewater Class A Exam. Enjoy flashcards and multiple choice questions, each with hints and explanations. Prepare effectively for your exam!

The contact stabilization configuration employs two aeration basins within a single treatment unit, which is essential for optimizing the biological treatment process. In this system, one basin is used for contact between wastewater and microorganisms, allowing for rapid removal of organic material, while the second basin is utilized for stabilization of the returned sludge. This design supports a higher rate of organic matter removal by leveraging the principle of simultaneous aeration and clarification.

This dual-basin approach enhances the efficiency of the treatment process by allowing for greater control over retention times and food-to-microorganism (F/M) ratios, which are critical parameters in activated sludge systems. Additionally, it facilitates the separation of treated water and biomass, maximizing the overall effectiveness of the treatment system.

Other configurations, while effective in their own rights, do not typically utilize two aeration basins for a single treatment unit. For instance, complete mix systems integrate continuous mixing, oxidation ditches are designed for extended treatment with a flow-through mechanism, and extended aeration systems focus on aeration for longer periods without necessitating two separate basins specifically for stabilization and contact.

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