Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

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What pressure is typically used to maintain the chlorine residual in water systems?

  1. 200 psi

  2. 80 psi

  3. 50 psi

  4. 30 psi

The correct answer is: 80 psi

Maintaining an adequate chlorine residual in water systems is critical for effective disinfection, and the pressure used can significantly impact the efficiency of the chlorine injection process. An 80 psi pressure is often considered optimal in many water treatment systems. This pressure level allows for a consistent and sufficient flow of chlorine solution into the water supply while ensuring that the chlorine can be effectively mixed and dosed appropriately. At 80 psi, the chlorine can effectively travel through the distribution system, overcoming friction losses and maintaining a uniform chlorine concentration throughout the water. Additionally, operating at this pressure helps to achieve better atomization of the chlorine, which is essential for maintaining an adequate residual and ensuring that the water remains safe for consumption. Using significantly lower pressures, such as 30 psi, may lead to inadequate mixing and insufficient contact time, potentially resulting in lower chlorine residual levels. Higher pressures, like 200 psi, could pose operational risks and complicate system maintenance without providing significant benefits in terms of residual maintenance. Therefore, 80 psi strikes a balance between effective chlorine delivery and practical operation within water treatment systems.