California Wastewater Treatment Operator Practice Exam

The correct answer is D, frequently throughout the day. In a wastewater treatment plant, the sludge at the bottom of the clarifier should be continuously or frequently pumped out to prevent it from building up and affecting the efficiency of the treatment process. Allowing sludge to accumulate for too long can lead to operational issues and impact the overall treatment performance. It is important to maintain a regular schedule of removing sludge to ensure the proper functioning of the clarifier and the treatment plant as a whole. Options A, B, and C are not ideal because the frequency suggested in these options may not be sufficient to prevent the buildup of sludge, which can potentially lead to operational problems and impact the treatment process.