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 |
|
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)
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB86-115029 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
98 pages : illustrations |
Abstract |
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. |
Notes |
"EPA Contract No. CR 810676-01-0." "October 1985." "EPA/600/2-85/119." Microfiche. |