A&B Test Questions - Florida Rural Water Association

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30. What will the dosage rate be for a softening plant using 7O% hydrated lime to apply a limedosage of 45 mg/l to a flow of 3.2 MGD.a. 1816 lbs./db. 1716 lbs./dc. 1616 lbs./dd. 1516 lbs./dMATH APPLICATIONSection31. The following are alkalinity titration results and expected conditions:P = Phenolphthalein AlkalinityT = Total AlkalinityO = Not PresentMATH APPLICATIONSectionTitration Result Bicarbonate Carbonate HydroxideP=0 T 0P < ½ T T – 2P 0P = ½ T 0 0P > ½ T 0 2P –TP = T 0 TWhich is the correct set of data for the Carbonate Conditions?a. O, P, 2P, 2T –2P. Ob. O, 2P, 2P, 2T –2P, Oc. O, 2P, P, 2T –2P, Od. O, 2P, 2P, T –P, Oe. O, 2P, 2P, 2T –2P, O .32. When alkalinity (as CaCO3) is greater than the total hardness and the pH is 9.0 you must ____to soften the water.a. Raise the pH to 9.3b. Reduce only the Carbonatesc. Increase the P alkalinityd. Precipitate noncarbonate (permanent) hardnesse. Precipitate Hydroxides18
33. You have added excess lime to your raw to ensure complete softening reactions, Now you havescaling problems in the water distribution system and need to convert the carbonate ions intosoluble forms. It would be best for you to:a. Use Hydrochloric Acid to precipitate calcium carbonateb. Assure that the following reaction occurs: Mg(HCO3)2 + 2 NaOH >Mg(OH)2 + 2 Na2CO3 + 2 H2Oc. Lower the pH using recarbonationd. Add additional lime to increase precipitant in clarifier and force the reactions tocompletione. Add Soda Ash to decrease non-carbonate scale34. You have increasingly corrosive water in a lime softening plant. The calcium hardness timesthe alkalinity has been near 100 for some time. Now the product is 95. What additionalchemical may be required?a. Caustic Soda (Na OH)b. Carbon Dioxidec. Soda Ashd. Potassium Permanganatee. Hexametaphosphate35. The first step in the softening process isa The conversion of carbon dioxide to calcium carbonateb. The conversion of magnesium bicarbonate to calcium carbonate.c. The conversion of magnesium carbonate to calcium carbonate.d. The conversion of calcium bicarbonate to calcium carbonate36. The minerals that cause hardness in water are precipitated out of the water asa. calcium carbonateb. magnesium carbonatec. calcium carbonate and magnesium carbonated. calcium carbonate and magnesium hydroxide19
Page 2 and 3: Table of ContentsCHLORINATION AND D
Page 4: 6: Chlorine dioxide reacts with wat
Page 8 and 9: 25: Which one of the following is t
Page 10 and 11: Disinfection By-Products1: Trihalom
Page 12 and 13: Lime Softening1. Minimum hardness t
Page 14 and 15: 11. Using the analyses below, calcu
Page 16 and 17: 21: In spilt treatment, a portion o
Page 20 and 21: Ion Exchange Softening1. Minimum ha
Page 22 and 23: 12. The third stage in the ion exch
Page 24 and 25: 6. Polarization in an RO system is
Page 26 and 27: 7. The primary source of household
Page 28 and 29: 16. A Langlier Index 0 or a Driving
Page 30 and 31: Iron and Manganese Removal1. The mi
Page 32 and 33: Taste and Odor Removal1. The first
Page 34 and 35: Problem: Marshy, or woody odor. Use
Page 36 and 37: 6. What should you do if test resul
Page 38 and 39: 14. All but one of the choices belo
Page 40 and 41: 6. It is in the middle of the summe
Page 42 and 43: 5. Your feed rate scale for Floccul
Page 44 and 45: 11. You are considering the additio
Page 46 and 47: Water Chemistry1. Which of the foll
Page 48 and 49: 13. Health authorities encourage us
Page 50 and 51: 24. A well water has a pH of 6.2, a
Page 52 and 53: 35. Zeta potential is nota. an elec

A&B Test Questions - Florida Rural Water Association

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