CA Wastewater Grade 3 sample questions and answers| 100% correct| New 2026

CA Wastewater Grade 3 sample questions and answers| 100% correct| New 2026 Fluffy white foam indicates low aerator solids concentration, while leathery brown foam indicates high solids concentration. T When an anaerobic digester is becoming upset, the first sign will be increased alkalinity and decreased volatile acid concentration F Surface aerator oxygen transfer efficiency increases as submergence decreases and the oxygen transfer efficiency increases F When chlorine is used before disinfection for odor control it is not necessary to satisfy a chlorine demand. F Biological secondary treatment processes should remove at least 85% of the influent BOD T Short detention times are normal for package plants F An activated sludge plant with an MCRT of over 10-days is normally considered an extended aeration plant. T Wasting of activated sludge on a continuos basis is the preferred method. T SVI is used as an indicator for clarifier stability. T The standard BOD test measures the amount of dissolved oxygen consumed by bacteria as they utilize waste for food during a 8 day period at 15 degrees Celsius. F When operating an aerobic digester be sure to keep the feed sludge volatile solid concentration high or else the percent reduction will decrease