A&B Test Questions - Florida Rural Water Association

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Lime Softening1. Minimum hardness that lime soda ash softening can achieve isa. Zerob. 30 to 40 mg/lc. 80 mg/Id. 80 to 90 mg/i.2. The purpose of adding carbon dioxide to softened water ís to:a. reduce lime usagea. Increase finished water pHb. restore the methyl alkalinityd. restore the carbonate balance3. Lime sludge may be dewatered bya. pondsb. solar lagoonsb. solids contact unitsc. sludge collectors4: Non-carbonate hardness can only be reduced by which of the following processes?A: Ca(OH) 2 , ion exchange. RO. electrodialysis, NaOHB: lime soltening , coagulation, filtration, disinfectionC: Na 2 CO3, ion exchange, membrane separation, NaOHD: reverse osmosis, chlorine dioxide, CaO, oxidation5: Complete the following statement: Selective carbonate removal isA: removal of calcium bicarbonate hardness at pH of 9.6B: removal of magnesium bicarbonate hardness at pH 10.6C; removal of non-carbonate hardness at pH 10.0D: removal of calcium sulfate hardness at pH 10.612
6: Using the chemical analyses below, calculate the correct results.Total Hardness: 180 mg/LPhenolphthalein Alkalinity: 50 mg/LTotal Alkalinity: 90 mg/lA: HCO 3 : 10 mg/l, CaCO3: 100 mg/l, OH:0, NCH 90 mg/lB: HCO 3: 100 mg/l, CaCO3 10 mg/l, OH 0 mg/l, NCH 0 mg/lC: HCO 3 : 0 mg/l, CaCO3 80 mg/l, OH 10 mg/l, NCH 90 mg/lD: HCO 3: 10 mg/l, CaCO 3 0 mg/l, OH 80 mg/l, NCH 0 mg/lMATHAPPLICATION7: When is noncarbonate hardness is present in water?A: when the total hardness is greater than total alkalinityB: when the total hardness equals total alkalinityC: when the total alkalinity is greater than total hardnessD: when the total alkalinity is twice the total hardness8. Select the correct statement.A: Ion exchange softening will remove non carbonate hardnessB: Lime. Softening will increase the calcium content of the waterC: Lime Softening will reduce the hardness to near zeroD: Ion exchange softening will reduce the Na content of the treated H 2 09: Non-carbonate hardness can be removed by which of the following processes?A: Ca(OH) 2 , ion exchange, oxidation, ROB: lime softening. coagulation, filtration, disinfectionC: Na 2 CO 3 , NaOH precipitation, Ion exchangeD: reverse osmosis, chlorine dioxide, CaO, oxidation10: Complete the following statement: Selective carbonate, removal isA: removal of calcium bicarbonate hardness at pH 9.6B; removal of magnesium bicarbonate hardness at pH 10.6C: removal of non-carbonate hardness at pH 10.0D: removal of calcium sulfate hardness at pH 10.613
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 14 and 15: 11. Using the analyses below, calcu
Page 16 and 17: 21: In spilt treatment, a portion o
Page 18 and 19: 30. What will the dosage rate be fo
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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