A&B Test Questions - Florida Rural Water Association

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. Water 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