Statistics for Texas Waste Water Treatment Ch#03 Composition and Characteristics

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Question	Answer	% Correct
A flow totalizer is required when the plant design flow is more than ________.	0.5 MGD	100%
Why is it difficult to accurately describe waste water?	All of the above	100%
Oxygen in streams can be depleted by which of the following?	All of the above	100%
Biochemical oxygen demand (BOD) is a measure of ________.	oxygen used up	100%
A type of bacteria that would not be beneficial in treatment is ________.	pathogenic	100%
Which of the following will each person contribute to the waste water treatment plant?	An average of 100 gal WITH a BOD of 0.17 lb. per day	80%
Septic waste water ________.	is the result of bacterial action	80%
Which of the following describes the chemical oxygen demand (COD) test?	None of the above	80%
Solids in waste water include________.	settleable and non-settleable	80%
Solids may be classified as which of the following?	All of the above	60%
Cycles of decay include which of the following?	Carbon, nitrogen, AND sulfur	60%
Which of the following describes organic compounds in waste water?	Contain carbon, hydrogen, and oxygen AND may also contain nitrogen, phosphorous, and sulfur	60%
A type of organic matter that may be present in waste water is ________.	proteins	60%
Which of the following do carbohydrates include?	Starches	60%
A kind of gas found in treatment systems that is not dangerous is ________.	dissolved oxygen	40%