Filtration
Math
Rules and Regs
Laboratory
Equipment
100
The treatment step that is omitted in direct filtration.
What is sedimentation?
100
During a 30 minute pumping test 3680 gallons are pumped into a 10 ft diameter tank that is 12 ft deep. Find is the pumping rate in gallons/minute.
What is 122.7 gpm?
100
According to the Surface Water Treatment Rule, water systems must sample filtered water for turbidity at least this often.
What is every four hours?
100
This is the simplest QC test. Two tests are run on the same sample to determine the precision of the analyst.
What is a duplicate?
100
A type of pump consisting of an impellar on a rotating shaft enclosed by a casing and having both a suction and discharge connection. The spinning impellar throws water outward at a high velocity and the shape converts velocity to pressure.
What is a centrifugal/velocity pump?
200
The filter media is made of the silicate skeletons of marine organisms and is most commonly used in small water systems.
What is diatomaceous earth?
200
Convert 2730 gpm into gpd
What is 3,931,200 gpd?
200
All community water systems must maintain this minimum positive pressure in the distribution system to protect against backflow.
What is 20 psi?
200
The testa for total hardness and calcium hardness involve a titration with this chemical.
What is EDTA?
200
The operating condition under which electrical motors pull the most current.
What is start up?
300
The fact that the filter media can not be observed during operation is the primary disadvantage of these filters.
What are pressure filters?
300
The motor horsepower required for a pumping job is 39 HP. The power cost is \$0.08/kW/hr. Find the cost of operating the motor for one hour.
What is \$2.33/hr?
300
Water storage tanks must be professionally inspected this often.
What is every 5 years?
300
This test for chlorine residual is not affected by color or turbidity but it does take more operator skill.
What is amperometric titration?
300
This is the primary indicator of pump bearing failure.
What is noise from the pump?
400
The head loss in a filter at which water can no longer be filtered at the desired rate.
400
Find the pounds per day of chlorine required to dose 14 million gallons of water at 3.3 mg/L.
What is 385 lbs?
400
The total coliform monitoring frequency is based on this.
What is the population served.
400
The incubation temperature for fecal coliform bacteria.
What is 44.5 +/- 0.2 C ?
400
This is used to feed a liquid chlorine solution into the water supply.
What is a hypochlorinator?
500
To prevent the loss of media in a filter backwash rates should not exceed this.
What is 15-20 gpm?
500
Determine the chlorine dose in mg/L if 28 lbs of chlorine gas is fed for a flow of 1.75 MGD.
What is 1.9 mg/L?
500
The action level for copper.
What is 1.3 mg/L?
500
In order to obtain a representative sample of water from the distribution system for total coliform analysis you should flush the line for this amount of time before collecting the sample.
What is 2-5 minutes?
500
The potentially dangerous slam that occurs in a pipe when there is a sudden change in the water velocity.
What is water hammer?