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Water Treatment Plant Produdion Study <br />. <br /> <br />. <br />n.wwnnxIT,E -a R. ~ <br />= crw <br />SiEPIT%REENIYAL.4R <br />FICL7tE 3-1; STEP IiSiEP 2 REMOVAL D051GE <br />EA}UNCHI C04GULATION'IESf[NG <br />SAPINP.WTP,IANGVIEW,TX - <br />Hx;~W~m: SeptOUtt •+lVef <br />SulidBvo S~ry1~ •xmfxpxa~.o <br />s <br />E <br /> <br />e <br />=z <br />fi <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 />SUMMARY OF TESTING RESULTS <br />Enhanced Coagulation Testing <br />♦ The STEP 1 TOC removal requirement for both plants is 45% for all quarters <br />of testing. <br />♦ Of the six exception criteria, only the raw water SWA exception was met in <br />the first two quarters at the L.ake Cherokee WTP. 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 />hom 30 mg/L. to 60 mg/L of alum to meet eithez 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 />41 At both W"I'Ps, 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 ouiperfonned the others in color <br />removal. In tettns of turbidity removal, there were no significant performance <br />differences between alum, Polymer Blend A and Polymer Blend B at both <br />plants. <br />Ozonation Pilot Testing <br />♦ At the Cherokee plant, preozonation slighUy improved turbidity removal. <br />Preozonation at the Sabine plant provided results ranging from no <br />improvement to slight improvement. <br />~ 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 W7'P. <br />Inno u-e App ctiles.. 7~ Cl' <br />rvsraunee amxow.xmi mm(voau.m wum~anrnc <br />(v4.4fia~a1) (SMLi~N , `iolA[~iwl, (M4Md II <br />l <br />