Water Treatment Operator Level 1 Sample Questions (Water Operator Certification Study Guide) | Latest 2024/25 What are the two important factors impacting the effectiveness of chlorination? Concentration of chlorine and contact time The treatment process that contr ols corrosion or scaling is known as what? Stabilization Permanganate reactions are highly dependent on what factor? pH It is hardest to kill the organism that causes what illness? Cryptosporidiosis Disinfection of water wells with free chlorine require s exposure for how long and at what concentration? 12 to 24 hours; 50mg/L Flocculation basins are usually designed to provide for detention times of how long? 15 to 45 minutes Alum works best in a pH range of what? 5.8 to 7.5 What has little effect on c olloidal particles because of their small size? Gravity What natural electrical force keeps colloidal particles apart in water treatment? Zeta potential What does the zeta potential measure? The number of excess electrons found on the surface of all part iculate matter What device collects the settled water as it leaves the sedimentation basin? The effluent launder In solid -contact basins with fairly constant water quality parameters, how often should the solids concentration be determined? At least twice per day What is the definition of decant? To draw off the liquid from a vessel of any size without stirring up bottom sedimentation How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected? Once a year What is the most important reason to reduce turbidity? To remove pathogens
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