Study guides, Class notes & Summaries

WASTEWATER OPERATOR GUIDE TO PREPARING FOR THE CERTIFICATION EXAMINATIONS (CLASS B-A OR III-IV) Anaerobic digestion gas handling systems are kept under positive pressure for what reason? - correct answer To prevent air from entering the system and mixing with digester gas, which could cause an explosion What are the components of an effective safety program? - correct answer Regular safety briefings, daily practice, a strong advocate for safety, and a strong central leader. Which of the...

Wastewater Operator All Verified Questions with Complete Solution

Surface water runoff, storm water, sanitary and industrial. - A collection system that is called "combined" may carry this kind of wastewater: 2 - The flow in a collection system should be a minimum of ____ feet per second (FPS)? Solids will settle. - What will happen if the flow is too slow in a collection system? Odors, Corrosion, Hydrogen Sulfide Gas (all of the above) - A short detention time in the collection system will help prevent which of the following problems? Low areas must b...

First action for a polymer spill - Apply an absorbent to the spill such as sand or kitty litter and then sweep up the materials. Total discharge head includes - Discharge pressure head + static discharge head + Velocity head (outlet) + Friction Head (discharge line) Where is the best location to collect a sample? - A location that represents the entire waste stream or basin. What are the preservation and hold times for BOD samples? - 48 hours at < or = to 6 degrees C.

General Wastewater Treatment: What is the pressure head caused by? - Water elevation General Wastewater Treatment: What color should the piping be that contains reclaimed water? - purple General Wastewater Treatment: What is the term for the height to which a column of water will rise in a well. - piezometric surface General Wastewater Treatment:

An Imhoff cone is used to measure________solids. A. suspended B. colloidal C. volatile D. settleable - D. settleable (Operation of Wastewater Treatment Plants, Volume 1 by Kenneth D. Kerri) A _____ flume is widely used for measuring wastewater flow. - Parshall (Operation of Wastewater Treatment Plants, Volume 1 by Kenneth D. Kerri)

Flow measurement system where flow stream contents are collected in container for fixed period of time - Timed gravimetric Uses a strong oxidizer to break down organic material - Chemically Oxidizable Carbon (COD) a measure of carbon dioxide given off when material is heated to 550° - Total Organic Carbon (TOC) What is the recommended detention time for a primary clarifier? - 1 1/2 - 2 hours What would be added to a lagoon/pond to subdue a strong odor and increase oxygen (O2)? - Sodium N...

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 ...

In the formula Q=V(A), Q is defined as rate of flow expressed as? -Cu. Ft. / sec. What is the primary objective of the Clean Water Act of 1972? -Restore and maintain the chemical, physical, and biological integrity of water in the US When cells use their own protoplasm and start to eat each other, as food to provide the energy to maintain life, this is known as what type of growth? -Endogenous Why is sampling of wastewater important? -Evaluate the wastewater treatment process What is the p...

WasteWater Sources & Characteristics: What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? - storm events WasteWater Sources & Characteristics: Combined wastewater is defined as - sanitary wastewater and stormwater runoff WasteWater Sources & Characteristics: In general, the solids content in wastewater is about - 0.1% WasteWater Sources & Characteristics: In general, what is the % of suspended solids in the total amount of soli...