Tennessee Wastewater Operator Practice Exam

What type of problem may be indicated by excessive build-up of solids in the chlorine contact chamber?

1. Insufficient disinfection

2. Increased pressure

3. Improved filtration

4. Increased flow rate

The correct answer is: Insufficient disinfection

Excessive build-up of solids in the chlorine contact chamber is a significant indicator of insufficient disinfection. The chlorine contact chamber is designed to allow proper contact time between chlorine and the wastewater in order for disinfection to take place effectively. When there is an accumulation of solids, it can hinder the chlorine's ability to effectively interact with and eliminate pathogens within the wastewater. This reduced interaction time can lead to inadequate disinfection levels and potentially allow harmful microorganisms to pass through the treatment process. The presence of excess solids could also indicate underlying issues with upstream processes, such as sedimentation or solids removal, leading to a higher concentration of particulates that affect the chamber's function. Ultimately, the primary concern is ensuring that the environment allows for sufficient contact between the chlorine and the pathogens to ensure effective disinfection — excessive solids directly compromise this essential function.