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<br />....:l<:.,;, <br /> <br />"Enhanced Coagulation" mode, increasing the cost of operation and possibly <br />making turbidity removal more difficult. The purpose of enhanced coagulation is to <br />achieve higher percentages of TOC removal and reduce disinfection byproducts such <br />as TIHMs and HAAs. <br /> <br />Production Study <br /> <br />Plant <br /> <br />Treatment <br /> <br />Woter <br /> <br />The second area of the study was preozonation evaluation, assessing the potential <br />following benefits in water treatment: <br /> <br />Improves <br /> <br />removal <br /> <br />Improves color removal <br />Improves <br /> <br />turbidity <br /> <br />. <br />. <br />. <br /> <br />HAAs <br /> <br />taste and odor reduction <br /> <br />such as TIHMs and <br /> <br />than other commonly used disinfectants <br /> <br />The purpose of this report was to present the final results of enhanced coagulation <br />and ozonation pilot testing for all four quarters of testing. <br /> <br />SUMMARY OF TESTING RESULTS <br /> <br />Enhanced Coagulation Testing <br />. The STEP 1 TOC removal requirement was 35% for all quarters of testing. <br />The STEP 2 removal requirement by ferric sulfate in the second quarter <br />(16.5%) is based on the TOC removal vs. coagulant dose curve. <br />. Of the eight exception criteria, only the raw water SUVA exception was met <br />in the first two quarters at the Grapevine wrP. Otherwise. the plant was <br />required to meet either a STEP 1 or STEP 2 TOC removal requirement. <br />. The enhanced coagulation testing shows that the City was able to meet the <br />STEP 1 TOC removal requirement in the last two quarters by adding from 60 <br />mgIL to 95 mgIL of alum. In the first two quarters. Alum was unable to meet <br />either the STEP 1 or the STEP 2 removal requirements. A high dose (95 <br />mgIL) of ferric sulfate met the STEP 1 removal requirement in the first <br />quarter, and a ferric sulfate dose of 38 mgIL met the STEP 2 removal <br /> <br />. Controls chlorination byproducts <br />. <br /> <br />Stronger disinfectant <br /> <br />" <br /> <br />~,.., <br />.~~101 <br /> <br />o WDMIOUtIJIC <br /> <br />!Mj'LIIlo\TtO>; <br /> <br />.'I'ftHlI1o......'~. <br /> <br />.<:...1:...",01.11. <br /> <br />&"".""111n <br /> <br />..."'~u.. <br /> <br /> <br />City of Grapni.e <br />W der Treat_eDt. Pl... <br /> <br />FIGURE 7-l <br /> <br />t';'l"'~ <br /> <br />~. <br /> <br />. <br />. <br /> <br />!ftI <br /> <br /> <br />InllCwClti'./(. Appl ouch,,:,. .. /', <Jc!icu! <br />