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<br />Water Treatment Plant Production <br /> <br />-~ <br /> <br />The purpose of this report is to present the final results of enhanced coagulation and <br />ozonation pilot testing for all four quarters of testing. <br /> <br />SUMMARY OF TESTING RESULTS <br /> <br />LOftlVWW. (;bfroKte ","' <br />.'"t Quar1er <br /> <br /> <br />UI10 <br /> <br />I <br />i <br /> <br />.ALUM i <br /> <br />. HYPER 1ON.J)90 l <br /> <br />.__ OIlVPER ION 7~D2; <br />.----: <br /> <br /> <br />, <br />--..----.......--i <br /> <br />, <br /> <br />_.m._ .-.-_.._1 <br />I <br />I <br />I <br />I <br />I <br />.1 Ozonation Pilot Testing <br />.J . At the Cherokee plant, preozonation slightly improved turbidity removal. <br />I Preozonation at the Sabine plant provided results ranging from no <br />i improvement to slight improvement. <br />fOOR1ll QUARTER <br />~:":-'J At both plants, preozonation (with coagulation, flocculation and <br />sedimentation processes) improved color removal. Preozonation alone <br />(without alum) destroyed 37% to 65% of the color at the Cherokee WfP. <br /> <br /> <br />Enhanced Coagulation Testing <br /> <br />. The STEP 1 TOC removal <br />of testing. <br />. Of the six exception criteria, only the raw water SUVA exception was met in <br />the first two quarters at the Lake Cherokee WfP. Therefore. both plants were <br />required to meet either a STEP 1 or STEP 2 TOC removal requirement. <br />. The enhanced coagulation testing shows that the City was required to add <br />from 30 mg/L to 60 mg/L of alum to meet either the STEP 1 or STEP 2 TOC <br />removal requirement at the Sabine plant. Typical alum dosages used at this <br />plant range from 30 mg/L to 70 mg/L. <br />. The Cherokee plant met STEP 1 TOC removal requirement (45%) with an <br />alum dose of 47.5 mg/L in the third quarter. All other quarters required alum <br />dosages of 30 mg/L to 50 mg/L to meet the Step 2 criteria. Typical alum <br />dosages at this plant range from 20 mg/L to 30 mg/L. <br />. At both WfPs, all coagulating chemicals produced settled water with <br />acceptable turbidity and apparent color levels. In the four quarters of testing, <br />no one coagulation chemical consistently outperfonned the others in color <br />removal. In tenns of turbidity removal, there were no significant perfonnance <br />differences between alum, Polymer Blend A and Polymer Blend B at both <br />plants. <br /> <br />quarters <br /> <br />is 45% for al <br /> <br />requirement for both plants <br /> <br />pll <br /> <br />~ <br /> <br />RAWW^TERTOC.4.~mgll. <br />. RAWW ATCR: Ai.KAIJNI1'l'';'~)" w:lliL Uti- <br />c.co' <br /> <br />oosE:.40m"'~_uuuum_~_ <br /> <br />-"'-- ... <br />~ <br />fl.._ -WI. <br />~IIID.-. <br /> <br />__...u_ ._.___ <br />FIGURE 3-1: STEP lISTEP 2 REMOVAL DOSAGE <br />EJ\lIANCED COAGULATION TFSTING <br />SABINE wrp, WNGVIEW, TX <br /> <br />o <br />:IHaU:hod Ban: Slep 1 Dose <br />: Solid Bars: Step 2 Dose <br /> <br />,,) <br /> <br />" <br /> <br />~ <br />e <br />i4:1 <br />C <br />i <br />.5)l) <br />r. <br />! <br />\,i <br />2ll <br /> <br />'" <br /> <br />~,/.u <br />10C REMOVAL (JJ.3'io) <br /> <br />~ <br />g <br />;. <br />~ u- <br />; <br /> <br />1":1 <br /> <br /> <br />0.5':' <br /> <br />. <br /> <br />. <br /> <br />PlIlST QUARTeR <br />r<S'O .....'dl <br />~ Achie~ J <br /> <br /> <br />~0'Z~7;"~~~~~2~~.:':~~-_._~' ..-:..-,..._'-..h...., <br /> <br /> <br />11111O\/oti\/<.' ApPloociles.. F'lclcticlil <br />