Which of the following is considered fixed media in wastewater treatment?

Which of the following is considered fixed media in wastewater treatment?

• A. Rotating Biological Contactor (RBC)
• B. Suspended Growth Reactor
• C. Activated Sludge Process
• D. Continuous Flow Reactor

Answer: (A)

Fixed media in wastewater treatment refers to systems where microorganisms are attached to a surface in a stationary manner, as opposed to being suspended within the wastewater. The Rotating Biological Contactor (RBC) fits this definition as it consists of a series of discs mounted on a rotating shaft. These discs are partially submerged in wastewater and provide a surface area for biofilm growth, allowing microorganisms to degrade organic pollutants as the discs rotate. This method of operation enables the biofilm to be continually exposed to the wastewater, enhancing the treatment process without requiring significant movement of the activated biomass. In contrast, the other options involve processes where the microorganisms are typically not fixed to a structure and instead are suspended throughout the treatment system, such as in the activated sludge process or suspended growth reactors. Thus, the RBC is properly identified as a fixed media treatment method within the context of wastewater treatment systems.

Fixed media in wastewater treatment refers to systems where microorganisms are attached to a surface in a stationary manner, as opposed to being suspended within the wastewater. The Rotating Biological Contactor (RBC) fits this definition as it consists of a series of discs mounted on a rotating shaft. These discs are partially submerged in wastewater and provide a surface area for biofilm growth, allowing microorganisms to degrade organic pollutants as the discs rotate.

This method of operation enables the biofilm to be continually exposed to the wastewater, enhancing the treatment process without requiring significant movement of the activated biomass. In contrast, the other options involve processes where the microorganisms are typically not fixed to a structure and instead are suspended throughout the treatment system, such as in the activated sludge process or suspended growth reactors. Thus, the RBC is properly identified as a fixed media treatment method within the context of wastewater treatment systems.