A&B Test Questions - Florida Rural Water Association

More documents

Recommendations

Info

21: In spilt treatment, a portion of the water, about ____ is treatedwith an excess amount of lime to remove the ____ pH of over ____.A: 20%; calcium; 7B: 90%; calcium; 8.3C: 20%; magnesium; 7D: 90%; magnesium; 11.122: The determination of total hydroxide alkalinity is an important control test used in the limesoftening process. What is the correct method of determining this number?A: T.H.-T. Alk.B: 2T - PC: 2 P - T.H.D: 2 P – T23. Soda ash is commonly used in water treatment to:A: remove temporary hardnessB: remove all hardnessC: remove permanent hardnessD: lower the pH24: Calculate the dosage in mg/l hydrated lime Ca(OH)2 required tosoften the water with the characteristics given. /ParameterCO2 12 mg/ l 0 mg/lTotal Alkalinity 202 mg/l 30 mg/lTotal Hardness 230 mg/l 50 mg/lMg 10 mg/l 2 mg/lPH 7.2 9.0Lime Purity 90%A: 188 mg/LB: 256 mg/LC: 287 mg/LD: 174 mg/LMATH APPLICATIONSection16
25. Calculate the amount of soda ash Na 2 CO 3 required to remove the noncarbonate hardness in theabove problemA: 30 mg/lB: 45 mg/lC: 60 mg/lD: 125 mg/lMATH APPLICATIONSection26: in spit treatment excess lime is added to a portion of the water to remove:A: calciumB: IronC: magnesiumD: manganese.27. What chemical is used to remove non-carbonate hardness in chemicalprecipitation softening?A. carbon dioxideB: calcium sulfateC: sodium carbonateD: calcium hydroxide28. Split treatment can eliminate the need for:A: lime softeningB: recarbonationC: soda ashD: filtration29. You are using pH to determine lime addition in a lime softening plant. The pH meter indicatesa pH of 10 but after you have added lime you determine that the dose was excessive. What isthe most probable cause?a. The water contained an excessive amount of pHb. PH was actually 9c. The water contained excessive alkalinityd. The meter read 10 when it was actually much highere. The lime slaker has malfunctionedTROUBLESHOOTINGGUIDE17
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 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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?