Wastewater New York State Practice Exam

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What role does sloughing play in biological treatment systems?

It aids in nutrient absorption
It helps in the regeneration of filter media
It prevents fouling of the treatment system
It allows for the removal of excess biomass

The correct answer is: It allows for the removal of excess biomass

Sloughing in biological treatment systems refers to the process where excess biomass detaches from the biofilm or activated sludge and is removed from the system. This process is essential for maintaining system efficiency and preventing over-accumulation of biomass, which can interfere with the treatment process. By allowing for the removal of excess biomass, sloughing helps to control the concentration of microorganisms within the treatment system, ensuring that the microbial population remains balanced for optimal treatment performance. In biological treatment, especially in activated sludge systems, maintaining an appropriate amount of biomass is critical for effective nutrient removal and organic matter degradation. If too much biomass accumulates without sufficient sloughing, it could lead to issues such as reduced treatment capacity, lower oxygen transfer efficiency, and increased risk of system upsets. Therefore, sloughing plays a vital role in sustaining the health and operational effectiveness of biological treatment systems.