Dive into the 2025 NY Wastewater Exam – Flush Away the Competition with Confidence!

In a disinfection system utilizing ultraviolet (UV) light, the primary objective is to inactivate microorganisms effectively through the application of UV radiation. When evaluating factors that influence this process, water temperature, pH level, and flow rate are all crucial parameters that must be monitored and managed to optimize UV disinfection efficiency.

Water temperature can affect the viscosity of the fluid and the reaction kinetics of the microorganisms being treated. Higher temperatures may enhance disinfection performance, while low temperatures could diminish the effectiveness of the UV light.

The pH level is also significant in this context. An increase in pH can reduce the efficacy of UV disinfection since certain microorganisms may be more resistant to inactivation in more alkaline conditions. Moreover, the solubility and absorbance characteristics of contaminants can change with varying pH levels, impacting UV transmission through the water.

Flow rate is essential as well. If the flow rate through the UV system is too high, the water may not have sufficient contact time with the UV light for effective disinfection. Conversely, a flow rate that is stabilized and controlled allows for optimal exposure time, leading to effective microbial disinfection.

Maintaining proper chlorine residual in the effluent, however, is not a consideration for UV disinfection systems.