CEU Challenge

Members of the Florida Water and Pollution Control Operators Association (FWPCOA) may earn continuing education units through the CEU Challenge! Answer the questions published on this page, based on the technical articles in this month’s issue. Circle the letter of each correct answer. There is only one correct answer to each question! Answer 80 percent of the questions on any article correctly to earn 0.1 CEU for your license. Retests are available.

This month’s editorial theme is Disinfection and Water Quality. Look above each set of questions to see if it is for water operators (DW), distribution system operators (DS), or wastewater operators (WW). Mail the completed page (or a photocopy) to: Florida Environmental Professionals Training, P.O. Box 33119, Palm Beach Gardens, Fla. 33420-3119. Enclose $15 for each set of questions you choose to answer (make checks payable to FWPCOA). You MUST be an FWPCOA member before you can submit your answers!

EARN CEUS BY ANSWERING QUESTIONS FROM PREVIOUS JOURNAL ISSUES!

Contact FWPCOA at membership@fwpcoa.org or at 561-840-0340. Articles from past issues can be viewed on the Journal website, www.fwrj.com.

LICENSE NUMBER for Which CEUs Should Be Awarded

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LICENSE NUMBER for Which CEUs Should Be Awarded

Article 3 ____________________________________

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If paying by credit card, fax to (561) 625-4858 providing the following information:

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Monochloramine Disinfection for Alternative Water Supplies

Sean P. Menard and Thomas W. Friedrich (Article 1: CEU = 0.1 DS/DW/WW02015406) 1. Disinfection of water entering the Flatford injection well is now required because a. bacteriological counts have increased recently. b. the well’s zone of discharge allowance will no longer apply. c. Southwest Florida Water Management District is seeking an increase in allowable injection volume. d. a change in injection zone water quality has been detected.

2. A pH greater than _____ is conducive to chloramine formation. a. 7 b. 8 c. 9 d. 10

3. Guidelines for adjusting ammonium sulfate and sodium hypochlorite in the St. Cloud test stated that, when monochloramine was low and free ammonia was greater than 0.1 mg/l, a. an increase in ammonium sulfate was needed. b. there was no change in either ammonium sulfate or sodium. c. an increase in sodium hypochlorite was needed. d. an increase in both ammonium sulfate and monochloramine was needed.

4. Which of the following is not listed by the author as a primary benefit of using monochloramine over hypochlorite disinfection? a. Monochloramine is a more stable disinfectant. b. Monochloramine produces less disinfection byproducts. c. Monochloramine use is less costly. d. Monochloramine use is less hazardous.

5. A ratio of __________ parts of chlorine for every part of ammonia has been shown to most commonly form proper monochloramine. a. 2 – 3 b. 3 – 4 c. 4.5 – 5 d. 5 – 5.5

Review of Nitrification and Distribution System Water Quality

Frederick Bloetscher and Daniel E. Meeroff (Article 2: CEU = 0.1 DS/DW02015407) 1. A 2001 study noted that ______ pipe material is more likely to form biofilm than any other material. a. plastic b. cement c. asbestos cement d. ferrous

2. According to a 2001 study, _______ appears to be the most important factor in controlling the rate of chloramine decomposition. a. chloramine concentration b. temperature c. pH d. time

3. The most frequently identified bacteria genus associated with the first step of nitrification is a. Nitrospira. b. Nitrobacter. c. Nitrococcus. d. Nitrosomonas.

4. Samples that yield heterotrophic plate counts of 500 colony-forming units (CFU)/100 ml and chlorine residuals of less than ______ mg/l typically indicate conditions that promote biofilm growth. a. 0.2 b. 0.4 c. 1 d. 1.5

5. To control nitrification, ______ is the preferred pH for lime-softened water entering the distribution system. a. 8 b. 8.5 c. 9 d. 9.3

Maintain Disinfection Residuals and Reduce Flushing With Chlorine Dioxide

Shelby Hughes, Rhea Dorris, and Madison Rice (Article 3: CEU = 0.1 DS/DW02015408)

1. The U.S. Environmental Protection Agency (EPA) maximum residual disinfectant level for chlorine dioxide is ____ mg/l. a. 0.2 b. 0.4 c. 0.6 d. 0.8

2. During the 90-day pilot study, the reduction in systemwide total residual chlorine was ___ percent. a. 18 b. 43 c. 55 d. 96

3. Prior to conducting the pilot study, the Pasco and

Summertree water distribution system sampling revealed the presence of __________, and indication nitrification was occurring. a. ammonia b. Nitrosomonas c. nitrite and nitrate d. elevated heterotrophic plate counts

4. Which of the following is not listed as an advantage of chlorine dioxide over free chlorine? a. Less reactive to changes in pH b. More effective against viruses, bacteria, and fungi c. Forms fewer disinfection byproducts d. Can be used at lower concentrations and shorter contact times

5. ________________ is a byproduct formed by the aqueous dissolution of chlorine dioxide. a. Chlorite b. Hypochlorite c. Elemental chlorine d. Dichloroethane