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Main Title Trihalomethane precursor removal by coagulation techniques in a lime-softening plant : a three-phased study /
Author Thurrott, J. C. ; Zwart-Duryea, H. ; McGurn, K. ; Riger, K.
Other Authors
Author Title of a Work
Thurrott, J. C.
CORP Author Daytona Beach, FL. ;Russell and Axon, Daytona Beach, FL.;Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Publisher GPO,
Year Published 1985
Report Number EPA/600/2-85/119
Stock Number PB86-115029
Subjects Drinking water--Standards--Florida--Daytona Beach ; Water--Purification ; Trihalomethanes ; Lime ; Daytona Beach (Fla)
Additional Subjects Coagulation ; Water treatment ; Coagulants ; Concentration(Composition) ; Cost analysis ; Operating costs ; Coagulants ; Calcium oxides ; Design criteria ; Potable water ; Performance evaluation ; Disinfectants ; Softening ; Halomethanes ; XE 392 resins ; XE 513 resins ; Daytona Beach(Florida)
Library Call Number Additional Info Location Last
NTIS  PB86-115029 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 98 pages : illustrations
A research program identified and evaluated a treatment scheme that reduced trihalomethane (THM) concentrations formed in the treatment process by coagulating the THM precursor materials and removing them before chlorination. The process was evaluated in bench testing in an 18.9 L/min pilot plant and in a plant-scale trial that simultaneously compared the potential for precursor removal from a Florida ground water by conventional lime softening and by lime softening with a new polymeric coagulant (XE-392, Rohm and Haas). The correlation of total organic carbon (TOC) and ultraviolet (UV) absorbance with total trihalomethanes was investigated in an effort to establish an easily performed process control test. In general, reductions in trihalomethane formation potential concentrations were less than UV absorbance reductions but greater than TOC concentration reductions. No secondary deterioration in water quality was noted from the experimental treatment scheme and no major operational problems were experienced during the trial. The experimental coagulant system reduced THM concentrations by more than 50 percent compared to the conventional treatment methods used in the Daytona Beach treatment plant. A cost estimate was prepared. If the experimental coagulation process is used, the water treatment plant operating costs would climb from 33 cents/1000 gallons to 75 cents/gallons. These projected costs are considered too high to warrant the use of this polymeric coagulant in Daytona Beach, Florida.
"EPA Contract No. CR 810676-01-0." "October 1985." "EPA/600/2-85/119." Microfiche.