CSD 315 COMPREHENSIVE EXAM SCRIPT COMPLETE QUESTIONS VERIFIED SOLUTIONS
Question:
A common reason for wastewater system failure is __________.
Answer:
hydraulic overloading (due to modernized tank usually)
Question:
The value Q is.
Answer:
Quantity of Sewage (GPD)
Question:
Some malfunctioning OSSF can be made to function properly with minimal cost by implementing
______________.
Answer:
water conservation measures.
Question:
In estimating water usage for a single-family dwelling, the number of _________ in the home is a
key indicator; however, _________ should also be considered.
Answer:
bedrooms, square footage
,Question:
List four water saving plumbing devices that can be used in a home.
Answer:
low flow toilets, low flow shower head, low flow faucets, pressure reducing valves
Question:
Identify four water-saving habits homeowners should adopt.
Answer:
don't leave water running, full laundry and dishwasher loads, reduce/eliminate use of garbage
disposals, not using toilet for trash disposal
Question:
Two wastewater tests commonly used to measure the strength of sewage are the ________ test and
the ________ test.
Answer:
BOD, TSS
Question:
The minimum water usage rate that should be used for planning an OSSF for a new home with three
bedrooms and 3000 square feet of interior living area is _______ gallons/day.
Answer:
300
Question:
Blockage in the home plumbing system is often caused by _______, ________, and _________.
Answer:
oils, greases, and fats
, Question:
It is recommended that _____________ are not used because they significantly increase the amount
of suspended solids and organic matter that is discharged to sewage disposal system.
Answer:
garbage disposal
Question:
Several samples were taken from a small washateria with seven new water-conserving machines and
sent to a lab for BOD analysis. The average BOD was 406 mg/L. What would be the minimum
expected BOD (organic) loading in lbs./day?
Answer:
4.74 lbs/day
Question:
Would a treatment plant capable of handling 1500 gallons per day of wastewater with BOD as high
as 280 mg/L be capable of handling wastewater from the above washateria? What is the organic
loading capacity of this treatment plant?
Answer:
3.50 lbs/day
Question:
What is the loading rate of a system with: Q= 550GPD, BOD= 350 mg/L, Ph=8.4, TSS= 400 mg/L.
Answer:
1.6 lbs/day
Question:
The most commonly use primary treatment component in Texas for on- site systems is the.
Question:
A common reason for wastewater system failure is __________.
Answer:
hydraulic overloading (due to modernized tank usually)
Question:
The value Q is.
Answer:
Quantity of Sewage (GPD)
Question:
Some malfunctioning OSSF can be made to function properly with minimal cost by implementing
______________.
Answer:
water conservation measures.
Question:
In estimating water usage for a single-family dwelling, the number of _________ in the home is a
key indicator; however, _________ should also be considered.
Answer:
bedrooms, square footage
,Question:
List four water saving plumbing devices that can be used in a home.
Answer:
low flow toilets, low flow shower head, low flow faucets, pressure reducing valves
Question:
Identify four water-saving habits homeowners should adopt.
Answer:
don't leave water running, full laundry and dishwasher loads, reduce/eliminate use of garbage
disposals, not using toilet for trash disposal
Question:
Two wastewater tests commonly used to measure the strength of sewage are the ________ test and
the ________ test.
Answer:
BOD, TSS
Question:
The minimum water usage rate that should be used for planning an OSSF for a new home with three
bedrooms and 3000 square feet of interior living area is _______ gallons/day.
Answer:
300
Question:
Blockage in the home plumbing system is often caused by _______, ________, and _________.
Answer:
oils, greases, and fats
, Question:
It is recommended that _____________ are not used because they significantly increase the amount
of suspended solids and organic matter that is discharged to sewage disposal system.
Answer:
garbage disposal
Question:
Several samples were taken from a small washateria with seven new water-conserving machines and
sent to a lab for BOD analysis. The average BOD was 406 mg/L. What would be the minimum
expected BOD (organic) loading in lbs./day?
Answer:
4.74 lbs/day
Question:
Would a treatment plant capable of handling 1500 gallons per day of wastewater with BOD as high
as 280 mg/L be capable of handling wastewater from the above washateria? What is the organic
loading capacity of this treatment plant?
Answer:
3.50 lbs/day
Question:
What is the loading rate of a system with: Q= 550GPD, BOD= 350 mg/L, Ph=8.4, TSS= 400 mg/L.
Answer:
1.6 lbs/day
Question:
The most commonly use primary treatment component in Texas for on- site systems is the.
