Statistics for Texas Basic Waste Water Operations Final Exam Review

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General Stats

This quiz has been taken 9 times
The average score is 24 of 30

Answer Stats

Question	Answer	% Correct
The pH scale ranges from ________ to ________.	0/14	100%
When an accidental discharge, bypass, or spill occurs, the discharger must notify the TCEQ within ________ hours.	24	100%
A ladder must be within ________ feet of anyone in the trench.	25	100%
An administrative penalty for discharge violations can be up to ________ per day.	$25,000	100%
Organic loading of a stabilization pond is about ________ pounds of BOD/acre/day with a detention time of at least ________ days.	35/30	100%
A weir is an obstruction placed in a channel causing the water to ________.	back up	100%
The primary purpose of returning sludge in the activated sludge process is to have enough ________ in the aeration basin to match the food supply.	microorganisms	100%
The primary causes of wastewater stoppage are ________.	roots and grease	100%
Each person contributes about ________ lbs of BOD daily.	0.17	83%
When sludge in an Imhoff tank is near ________ inches of the slot, withdraw sludge.	18	83%
One surface acre of ponds provides treatment for about ________ people.	300	83%
A simple method of determining when to waste from an activated sludge plant is the ________.	30-minute settling test	83%
Excavations ________ feet or deeper should be shored, shielded, or sloped.	5	83%
In a well operated anaerobic digester, the methane gas content is about ________.	65-75%	83%
Ponding on a trickling filter is caused by ________.	all of the above	83%
Protecting Texas water from contamination requires ________ of wastewater.	all of the above	83%
Organic loading is the pounds per day of ________ per acre-feet or 1,000 cubic feet of media.	BOD	83%
Aerobic digestion is an ________ process whereby the aerobic bacteria consume themselves.	endogenous	83%
When chlorine is used, the effective disinfectant is ________.	HOCl	83%
Gas chlorinator feed rates are indicated by the ________ in pounds per day.	rotameter	83%
An ultrasonic flow monitoring device works on the principle of ________.	sonar	83%
How many square feet are in the end section of a 24-inch wastewater pipe?	3.14 square feet	67%
A sedimentation tank is 80 feet long, 40 feet wide, and 16 feet deep. What is the detention time, in hours, at a flow rate of 1.8 MGD?	5.1 hours	67%
The normal operator controls on an activated sludge process are ________.	RAS, WAS, and DO	67%
The most important problem prevented by monitoring or restricting industrial waste is ________.	worker exposure	67%
Imhoff tanks are ________ story units with ________ compartments.	2/3	50%
How many cubic yards of dirt are removed from a trench 600 feet long, 4 feet wide, and 8 feet deep?	711 cubic yards	50%
Examples of point source discharges are ________.	municipal, industrial, and agricultural wastewater treatment facilities	50%
Examples of waterborne pathogens are ________.	typhoid, cholera, and dysentery	50%
A wastewater treatment plant treats 1,800,000 gallons per day, using chlorine at 10 mg/L dosage. How many pounds of chlorine are used per day?	150 pounds	33%

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