Florida Drinking Water Operator "B" Practice Test

What strategies can operators use to prevent and control nitrification in the distribution system?

1. Implement Water Restrictions

2. Increase Chloramine Residual and Establish a Flushing Program

3. Reduce Water Pressure

4. Lower Chlorine Levels

The correct answer is: Increase Chloramine Residual and Establish a Flushing Program

Preventing and controlling nitrification in the distribution system is essential for maintaining water quality and safety. Increasing chloramine residuals and establishing a flushing program are effective strategies for managing nitrification. When chloramines, which are formed by the reaction of chlorine with ammonia, are properly dosed and maintained at adequate levels in the distribution system, they can inhibit the growth of nitrifying bacteria. These bacteria thrive in conditions where ammonia is present, and maintaining a higher chloramine residual helps suppress their activity, thus controlling nitrification. In addition, implementing a flushing program is crucial. Flushing the distribution system on a regular basis helps to maintain water quality by removing stagnant water and reducing the risk of nitrification. Stagnant water provides an environment conducive to the growth of nitrifying bacteria, so flushing reinforces the hydraulic conditions that can help prevent such growth. Therefore, the combination of maintaining a high chloramine residual and executing a systematic flushing program addresses the core factors that contribute to nitrification in the water distribution system, making this approach effective in ensuring safe drinking water.