Entries Tagged Licensing Exam

WASTEWATER - By Rick Lallish What type of pond is often used to treat strong industrial wastes? A. Aerobic B. Anaerobic C. Facultative D. Mechanically aerated Answer: B. Anaerobic...

WASTEWATER By Rick Lallish What type of pump should never be operated or started against a closed valve? A. Centrifugal pump B. Peripheral pump C. Positive...

WASTEWATER By Rick Lallish What is the desired pH level for a properly operating anaerobic digester? A. 4.0 to 6.6 B. 6.8 to 7.2 C. 7.6 to...

WASTEWATER By Rick Lallish What will happen if you lose vacuum to the feed line on a chlorinator? A. Water feed to the chlorinator...

WASTEWATER By Rick Lallish In a biological nutrient removal process, what is the condition where bacteria incorporate more phosphorus than needed for growth? ...

WASTEWATER - By Rick Lallish Chlorine contact time varies from state to state. Most states require either 15 or 30 minutes at the design...

There’s always demand for high-quality wastewater operator training materials. The Water Environment Federation (WEF) is answering the call with a new series...

WASTEWATER By Rick Lallish What process control measure has the most influence on sludge quality and determines the sludge age in an activated...

WASTEWATER By: Rick Lallish It is generally accepted that the sludge blanket depth in secondary clarifiers should not exceed 2 feet (0.6 meters)....

WASTEWATER By Rick Lallish How much influent organic matter is expected to be removed in primary treatment using a primary clarifier? A. 10 to 20...

WASTEWATER What are two types of solids effectively removed by primary clarifiers? A. Floatable and settleable B. Floatable and dissolved C. Dissolved and colloidal D. Suspended and...

WASTEWATER An advanced wastewater treatment plant is designed and built to remove BOD, TSS, total nitrogen and total phosphorus to very low levels...

WASTEWATER Which type of filter is used to reduce the organic loading on downstream biological processes? A. Tertiary filter B. Vacuum filter C. Traveling bridge rapid...

WASTEWATER During nitrification in an aeration tank, which of the following parameters will decrease? A. Alkalinity B. Oxidation reduction potential, or ORP C. Nitrate D. Nitrite Answer: A. As nitrification progresses through...