Which of the following influences the UV dosage in wastewater treatment?

The factors that influence the UV dosage in wastewater treatment are primarily related to the effectiveness of UV light in disinfecting water. Power refers to the intensity of the UV light, which affects how much energy is delivered during the treatment process. Higher power levels can result in a more effective disinfection as they provide a stronger UV dose.

Exposure time is also crucial because it determines how long the water is exposed to the UV light. The longer the exposure time, the greater the dose of UV light that the pathogens in the water will receive. This helps ensure that microorganisms are effectively inactivated during treatment.

Together, these elements—power and exposure time—directly determine the UV dosage, making this option the correct choice. This highlights the importance of these two parameters in achieving effective disinfection in wastewater treatment processes.