Certification Action Line features questions and answers typical of those appearing in Water Quality Association (WQA) certification examinations. Some answers may not satisfy everyone or every condition.
1. A maximum concentration of sodium chloride in 60° F brine is 26.4 percent.
2. High alkalinity and high pH can contribute to calcium precipitation fouling of tannin removal anion exchange resins.
3. Where the well pump cannot provide the full backwash flow needed, a larger diameter filter may be installed to provide the necessary flow of water.
4. Upon heating, the dissolved oxygen in water:
a) lowers the pH
b) becomes a free gas
c) attacks and damages metal surfaces and fittings
d) b and c above
e) all of the above
5. Hydrogen sulfide odor can begin to be detected at:
a) 0.05 ppm
b) 0.1 ppm
c) 0.5 ppm
d) 1.0 ppm
e) 10 ppm
6. Some modern high-tech water softeners can achieve salt efficiencies of over 6,000 grains of hardness removal per pound of saturated sodium chloride brine.
7. The typical capacity of a cubic foot of manganese greensand zeolite treating 5 ppm of iron plus manganese and regenerated with four ounces of KMnO4 is about:
a) 100 gallons
b) 1,000 gallons
c) 10,000 gallons
d) 100,000 gallons
e) 1,000,000 gallons
8. The capacity of nitrate removal anion exchange systems is affected by sulfates in water.
9. The hardness of water entering a RO system should be maintained less than:
a) 1 grain per gallon
b) 3 grains per gallon
c) 5 grains per gallon
d) 10 grains per gallon
e) 15 grains per gallon
10. The type of valve used to control the direction of flow is:
a) ball valve
b) gate valve
c) globe valve
d) none of the above