FLORIDA DW CLASS B EXAM 2024

It's in the middle of the summer & you're having a breakdown in the coagulation process in your up-flow clarifier due to algae, this problem occurs only in the late afternoon with periods of good operation before and after. What changes should you make during the problem periods to improve the finish water quality? - AnswerReduce the sludge blanket depth The inorganic compounds (ie. Iron) are effectively removed from your raw water using aeration. Test indicate an increasing taste and odor problem due to volatile organic compounds. What is the best action for these circumstances? - AnswerAdd a reducing agent You're considering the addition of alum to your up-flow clarifier. You determined 12 mg/l of alum is correct. The raw pH is 8.0 & the alkalinity is 230 mg/l. you know that it takes an excess of 21 mg/l of alkalinity per mg/l of alum for precipitation to occur. What would be best for this situation? - AnswerAdd an additional alum to increase the alkalinity Which treatment process would best treat a water containing 250 mg/l of hardness, 10 CU's of color, & a turbidity of 2 NTU's. The plants only customer requires a finished water containing zero hardness. - A