A&B Test Questions - Florida Rural Water Association

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6. It is in the middle of the summer and you are having a breakdown in the coagulationprocess in our up-flow clarifier due to algae, this problem occurs only in the late afternoon,with periods of good operation before and after this problem period. What changes shouldyou make during the problem periods to improve the finished water quality?a. Allow the Sludge blanket to buildb. Increase the amount of activated carbon in the slurryc. Increase the slurry leveld. Increase the sludge blanket depthe. Reduce the sludge blanket depthTROUBLESHOOTINGGUIDE SECTION40
Coagulation and Flocculation1. Pin point floc is a condition associated witha. flash mixingb. detention timec. poor filtrationd. low turbidity2. Operators are concerned primarily with particles in water that usually carry aa. negative electrical chargeb. positive electrical chargec. both positive and electrical charged. charge depends on location of plant3. The main purpose of flocculation is toa. allow chemicals to mix thoroughlyb. produce flocc. bring together micro flocd. improve settling4. An inspection of your Coagulation/Flocculation filtration plant yielded the followingproblems. Match the corrective action for each condition cited.Observed Conditions (match with number below)Corrective Actions1. Floc as it enters the basin is large and sheared2. <strong>Water</strong> has a milky appearance with a bluish tint3. Floc size increases in the flocculation basin then starts to break up.4. Floc rapidly settles in the first part of the sedimentation basin.a. Mixing intensity of the downstream flocculator is too highb. Excessive Coagulant dosagec. Excessive alum dosaged. Flash mixer is set too higha. d,b,a,cb. a.c.d.bc. c.d.a.bd. d,c,a,bTROUBLESHOOTINGGUIDE SECTION41
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 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 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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