A water plant wants a fluoride concentration of 1 mg/L in the finished water. The raw fluoride concentration is 0.25 mg/L. Find the amount of fluoride that should be fed in mg/L.
What is 0.75 mg/L?
100
The action level for lead.
What is 0.015 mg/L?
100
The one of the following which is most likey to cause an algae bloom (increased turbidity, increased air temperature, or increased nutrients).
What is increased nutrients?
100
Hard water scale is usually caused by which of the following compounds
(calcium bicarbonate, calcium carbonate, magnesium carbonate)
What is calcium carbonate
100
The health risk associated with high levels of nitrates in drinking water.
What is methemoglobinemia (blue baby syndrome)?
200
A water plant treats 12 MGD and wants a dose of 0.75 mg/L fluoride. Determine how many lbs of fluorosilicic acid is to be fed each day.
What is 412 lbs per day?
200
The maximum contaminant level goal (MCLG) for lead.
What is 0 mg/L?
200
This contaminant in the following list that is most common in groundwater and forms an insoluble precipitate when oxidized.
(hydrogen sulfide, methane, or iron)
What is iron?
200
This type of laboratory glassware is used primarily to mix chemicals and measure approximate volumes. (beaker, volumetric flask, graduated cylinder)
What is a beaker?
200
When alum racts with alkalinity in the water this is formed as a result.
What is aluminum hydroxide (jelly-like flocc)?
300
A total of 5 lbs of sodium fluoride is used to treat 0.2 MGD. Find the fluoride dose in mg/L.
What is 1.33 mg/L?
300
Turbidimeters must be calibrated at least this often.
What is quarterly?
300
The recommended range for fluoride in Tennessee.
What is 0.9- 1.3 mg/l?
300
This enzyme substrate test remains clear if no coliform is present, turns yellow if the sample is positive for total coliform, and fluoreces under UV light if the sample is positive for E. coli. The test usually takes 24 hours but an 18 hour version is available.
What is Colilert?
300
Of the following, name the chemical that is the best at disinfection. (Hypochlorous acid, Hypochlorite ion, hydrochloric acid)
What is Hypochlorous acid?
400
A water plant produces 250 gpm. Find the feed rate for a saturator in gal/day if the dose is 1 mg/L.
What is 20.16 gal/day?
400
A Tier 2 violation requires that a public notice shall be give within this amout of time.
What is no later than 30 days?
400
This type of filter is used to treat iron and manganese by using both adsorption and oxidation.
What is a manganese greensand filter?
400
The pH endpoint for total alkalinity.
What is 4.5?
400
Trihalomethanes can form when water that contains organic matter comes into contact with this substance.
What is chlorine?
500
A water plant uses 9 gallons of sodium fluoride from a saturator to treat 200,000 gpd. There is 0.18 mg/L of fluoride in the raw water. Find the total concentration of fluoride in mg/L.
What is 0.99 mg/L?
500
For a system that collects less than 40 microbiological samples per month, this is the number of positive samples the system can have and still be in compliance with the total coliform rule.
What is one?
500
The amount of alkalinity in mg/L required for each 1 mg/L of alum added to produce flocc.
What is 0.5 mg/L?
500
Of the following chemicals, the one that is used as an indicator when measuring total alkalinity. (EDTA, Bromcresol Green Methyl Red, or Phenolpthalein)
What is Bromcresol Green Methyl Red?
500
The type of low pressure membrane filtration considered an intermediate between ultrafiltration and conventional granular media filtration. Pore sizes range from 0.03 to 1.2 micron. It is an effective barrier for particles, bacteria and protozoan cysts.