Basic Wastewater Operator Practice Exam

What is the recommended method for cleaning lime slurry lines?

1. Replace feed line after each shift

2. Flush with water

3. Clean feed line with a stiff bristle brush

4. Flush with muriatic acid

The correct answer is: Flush with water

Flushing lime slurry lines with water is the recommended method because it effectively removes lime buildup and debris without causing damage to the system. Lime can create a thick, viscous paste that can harden and block the lines if not properly managed. By flushing with water, operators can ensure that residue is suspended and carried away, maintaining a clear flow path and preventing clogs. This method is both cost-effective and simple, allowing for routine maintenance without the risks associated with more aggressive cleaning agents. Water is also a non-corrosive and safe option compared to potentially hazardous substances, making it suitable for regular use in wastewater treatment facilities. Other methods, while they may seem viable, can pose problems. For instance, using muriatic acid could lead to unintended chemical reactions that might damage the infrastructure or introduce hazards to the treatment process. Similarly, replacing the feed line or using brushes can be impractical and labor-intensive, adding unnecessary downtime and operational complexity. Regular flushing with water provides a straightforward solution to keep the system running efficiently.