Statistics for Texas Waste Water Treatment Ch#09 Fixed Film Systems

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General Stats

This quiz has been taken 43 times
(40 since last reset)
The average score is 20 of 25

Answer Stats

Question	Answer	% Correct
Which of the following applies to zoogleal solids washed off a filter?	They are called sloughings and settle in final clarifier.	100%
Which of the following is a basic elements of a trickling filter?	All of the above	93%
Trickling filters may be classified as which of the following?	All of the above	93%
Filter operational problems include which of the following?	All of the above	93%
Which of the following materials should not go onto a trickling filter?	Large suspended solids	93%
Which of the following is true of filter media?	Must be durable and provide enough surface for bacterial growth	93%
Which of the following materials result from the stabilization of waste material as it passes through a trickling filter?	All of the above	86%
The recirculation ratio of a trickling filter has an effect on which of the following?	All of the above	86%
Which of the following does successful trickling filter operation depend on?	All of the above	86%
The zoogleal mass on a filter is composed mainly of which of the following?	Bacteria AND Algae	86%
Clogged orifices on influent distributor arms may be corrected by ________.	cleaning and flushing	86%
The underdrain system of a standard rate trickling filter should be ________.	designed to flow half-full	86%
Rotating biological contactors may be ________.	driven by electric motors or trapped air	79%
Methods of controlling filter flies include which of the following?	Flood the filter	79%
Which of the following are units commonly used to measure the rate of organic loading?	lb. BOD/acre ft./day AND lb. BOD/1000 ft.^3 /day	79%
The test that best indicates the efficiency of a trickling filter is ________.	percent BOD removal	79%
To control odors at a trickling filter plant, the operator may do which of the following?	All of the above	71%
Which of the following adversely affects the operation of a rotating biological contactor?	All of the above	71%
The rotating discs should be ________.	partially submerged in the wastewater	71%
A buildup of solids in the tank of the contactors may be caused by ________.	poor primary clarification	71%
The RBC unit must be preceded by a ________.	primary clarifier or fine screen	71%
The biological growth on the disc should do which of the following?	All of the above	64%
Units commonly used to measure the rate of hydraulic loading include ________.	lb./ft./day	57%
Rotating biological contactors are usually covered for which of the following reasons?	Prevent algae growth on the media	57%
Filter ponding may be caused by which of the following?	All of the above	50%