Florida Wastewater Practice Test 2025 – Complete All-in-One Guide for Exam Success!

The required chlorine residual for basic level disinfection according to FDEP chapter 62-600.440 (4)(b) FAC is specified to be 0.5 mg/L for 15 minutes at peak hourly flow. This standard is established to ensure that sufficient disinfection is achieved to reduce pathogens effectively in wastewater before it is released into the environment or further treated.

Chlorine is a widely used disinfectant because of its effectiveness in inactivating a broad spectrum of microorganisms that are typically present in wastewater. The specified concentration of 0.5 mg/L is crucial as it balances efficacy against pathogens while minimizing the potential formation of harmful disinfection byproducts. The duration of 15 minutes ensures that the chlorine has adequate contact time with the pathogens, which is essential for effective disinfection, especially at peak flow conditions when the concentration of contaminants may be at its highest.

The emphasis on peak hourly flow conditions is critical, as it acknowledges that wastewater flow rates can fluctuate significantly. Disinfecting at peak flow ensures that the system can still function effectively during times of higher volumes, providing a consistent level of treatment irrespective of flow variations.

In contrast, the other provided options either specify incorrect chlorine residuals, flow conditions, or duration that do not