wastewater

What is the typical BOD removal efficiency in a primary clarifier? A) 10 to 15% B) 40 to 60% C) 20 to 50% D) 95 to 99% C) 20 to 50% (v.1 pg 129) What does the "F" in F/M ratio represent? A) The microorganism population in the aeration tank B) The amount of filamentous bacteria in the activa...

In the activated sludge process, some of the activated sludge must be wasted to... A. Prevent excessive solid buildup B. Prevent clogging of the sludge return line C. Prevent overloading of sludge return pumps D. Increase digester gas production A. Prevent excessive solid buildup The best opera...

What is the methane content in a properly operation anaerobic digester? A) 30 to 35% by volume B) 1 to 2% by volume C) 65 to 70% by volume D) 15 to 20% by volume C) 65 to 70% by volume (v.2 pg 158) What will the addition of chlorine gas do to the pH of wastewater? A) Moderately increase pH B)...

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 Source...

What is the methane content in a properly operating anaerobic digester? 65 to 70% by volume What will the addition of chlorine gas do to the pH of wastewater? decrease the pH What is the purpose of a Parshall Flume? Measure the flow rate What is the typical removal efficency of settleable solids...

WWTP Wastewater Treatment Plant A community or municipal facility designed according to state and federal regulations and permitted for the purposes of purifying soiled water or wastewater which is the water and solids from a community including residential, commercial and often industrial entiti...

What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? Storm events Combined wastewater is defined as Sanitary wastewater and stormwater runoff In general, the solids content in wastewater is about 0.1% In general, what is the percentage ...

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 ...

Clean Water Act 1977 primary legislation concerning water pollution and its regulation. It establishes the NPDES permit system that prohibits point sources from discharging pollutants into waters of the United States. EPA Environmental Protection Agency is an agency of the federal government of t...

1 mg/l is the same as 1 part per billion F A scada system is capable of monitoring and controlling equipment from where? remote location A Discharge Monitoring Report is typically submitted to the regulatory agency on daily basis False = Monthly A mechanical seal is used to prevent leaks betwee...

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 col...

The first step the maintenance staff should take in properly locking and tagging out a piece of equipment is to... a) alert the operator on duty b) turn the equipment off at the motor control center (MCC) c) pull the switch on the electrical panel to "OFF" d) fill out the tags a) alert the op...

When Chlorine is combined with water what type of pipe should be used? A. Ductile iron B. Asbestos concrete C. PVC D. Carbon Steel C. PVC A good settling sludge would consist of what type of protozoa? A. Rotifers and nematodes B. Amoebas and Flagellates C. Stalked ciliates and mastagoria D....

Preliminary Treatment the 1st stage of sewage treatment where large debris, such as sticks, grit, and rags pas through a screen followed by a grit chamber, where the flow of water is slowed enough to allow for sedimentation. What stage of treatment is grit removal usually accomplished in? prelimi...