06-I Water Production Study - Laserfiche WebLink

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Wnier Treatment Plunt Production Study "Enhanced Coagulation" mode, increasing the cost of operation and possibiy making turbidiiy removal more difficult. The purpose of enhanced coagulation is to achieve higher percentages of TOC removal and reduce disinfection byproducts such as TTHMs and HAAs. The second area of the study was preozonation evaluation, assessing the potential following benefits in water treatrnent: 6 Improves turbidity removal inno ,ot ~ iAp~-oar~-:~:. ~;D FIcuxe 7•i ~ ~ ~ ~ _ & [mproves color removal ♦ Improves taste and odor reduction ~ Controls chlorination byproducts' such as TTHMs and HAAs ~ Stronger disinfectant than other commonly used disinfectants The purpose of this report was to present the final results of enhanced coagulation and ozonation pilot testing for all four quarters of testing. SUMMARY OF TESTING RESULTS Enhanced Coagulation Testing lb The STEP 1 TOC removal requirement was 35% for a(I quarters of testing. The STEP 2 removal requirement by ferric sulfate in the second quarter (16.5%) is based on the TOC removal vs. coagulant dose cunve. ♦ Of the eight exception criteria, only the raw water SWA excepfion was met in the first two quarters at the Grapevine WfP. Othenvise, the plant was required to meet either a STEP 1 or STEP 2 TOC removal requirement. ♦ The enhanced coagulation testing shows that the City was able to meet the STEP 1 TOC removal requirement in the last two quarters by adding from 60 mg/L to 95 mg/L of alum. In the first huo quarters, Alum was unable to meet either the STEP 1 or the STEP 2 removal requirements. A high dose (95 mg/L) of ferric sulfate met the STEP 1 removal requirement in the first quarter, and a ferric sulfate dose of 38 mg/L. met the STEP 2 removal Ii:LLSFI-NIGHOLS rt, r c..w.ie. W.t.. T.ue...e Pl..t