Water Treatment Operator Level 1 Sample Questions (Water Operator Certification Study Guide)
What are the two important factors impacting the effectiveness of chlorination? - Answer- Concentration of chlorine and contact time The treatment process that controls corrosion or scaling is known as what? - Answer- Stabilization Permanganate reactions are highly dependent on what factor? - Answer- pH It is hardest to kill the organism that causes what illness? - Answer- Cryptosporidiosis Disinfection of water wells with free chlorine requires exposure for how long and at what concentration? - Answer- 12 to 24 hours; 50mg/L Flocculation basins are usually designed to provide for detention times of how long? - Answer- 15 to 45 minutes Alum works best in a pH range of what? - Answer- 5.8 to 7.5 What has little effect on colloidal particles because of their small size? - Answer- Gravity What natural electrical force keeps colloidal particles apart in water treatment? - Answer- Zeta potential What does the zeta potential measure? - Answer- The number of excess electrons found on the surface of all particulate matter What device collects the settled water as it leaves the sedimentation basin? - Answer- The effluent launder In solid-contact basins with fairly constant water quality parameters, how often should the solids concentration be determined? - Answer- At least twice per day
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