Florida Dw Class B Exam Study Guide #2

Solids contact units are very sensitive to changes in {Ans: Influent flow & temperature (not wind)}Oxygen bound up in such compounds as sulfates & nitrates may serve as oxygen sources for {Ans: facultative organism}You operate a surface water plant that uses an up-flow clarifier, It has a raw water pH of 7.4 & an alkalinity 260mg/l Each spring as the weather changes you have a severe taste and odor problem. What change might you consider for the clarifier to minimize this problem? {Ans: Increase the sludge blanket depth}Non-settable solids are classified into three categories {Ans: Suspended, colloidial, and dissolved}You are conducting a pH test with a meter which doesn't have a slope knob. You must use the temperature knob to reach pH 10. What action should take place? {Ans: Allow more time for the temperature to stabilize}What treatment process would best treat a water containing 80mg/l of hardness, 1.0 CU's color & Turbidity of .2 NTU's {Ans: Chlorination and filtration}