A&B Test Questions - Florida Rural Water Association

More documents

Recommendations

Info

6. What should you do if test results indicate a filter mud ball volume of 2.6%a. Nothing, this is goodb. Add a polymerc. Reduce the coagulant dosed. “Bump” the filter gravele. Extend the backwash duration.TROUBLESHOOTINGGUIDE SECTION7. The design head loss in your filter is 10 feet. Your loss of head is 8 feet, the turbidity is 0.4NTUs and the elapsed run time is 24 hours. It would be best to:a. “Bump” the filter to delay backwashingb. Slow the flow to the filterc. Backwash the filter first thing next morningd. Increase the polymer doseTROUBLESHOOTINGGUIDE SECTION8. When a filter wash is uneven, the spots violently over washed might result in which of the following?a. Damage to sludge removal equipmenta. Cause the sand grains in this area to cement together.b. Cause an increase in the sand effective size.c. Overturn the gravel layer, allowing sand to displace it.9. When cold water starts to warm up, a condition that can occur in the media of a filter is calleda. Mudballingb. Jet actionc. Bed shrinkingd. Air bindingTROUBLESHOOTINGGUIDE SECTIONTROUBLESHOOTINGGUIDE SECTION10. Air binding of a filter can be caused bya. The reduction of pressure resulting from operating under a negative heada. An increase in the temperature of the water during filtrationb. The release of oxygen by algae collected within the filterc. All of the aboveTROUBLESHOOTINGGUIDE SECTION11. Some idea of the amount of filter media growth can be indicated bya. Periodic sieve analysis of the mediab. Periodic measurements of the distance from the top of the clean filter to the trough weirc. Periodic determinations of the percent solubility of the media in hydrochloric acidd. All of the aboveTROUBLESHOOTINGGUIDE SECTION36
12. Three items are missing in the information provided, Which one of the sets of data beloware the correct entries for the missing information for both filters?Filter Operating RecordNo,TimeStartStopHours OperatedToday Previous TotalHead LossStart StopWashMin M. Gal6/15 6/18 11:30 63.7 75.0 0.50 6.00 6 0.141 8:30 11:302 6/12 6/18 18:00 82.0 100.0 0.50 5.50 5 0.14Average Run Hours = _________Total Wash <strong>Water</strong> (MG) = _________Ave. Time of Wash = _________e. 87.5 hrs; 0.28 MG and 5.5 min.f. 72.65 hrs, 0.28 MG and 6 min.g. 72.65 hrs, 0.28 MG and 5.5 min.h. 75 hrs, 0.14 MG and 5 mini. 100 hrs, 0.14 MG and 5.5 min13. Mixed media filtersa. Use anthracite coal over sandb. May require a secondary coagulant applied ahead of the filters.c. Sometimes uses pressure to achieve higher filtration rates.d. All of the above37
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 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

Create successful ePaper yourself

Delete template?

Save as template?