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Drinking Water Technical Assistance Water Treatment Plant and Distribution System KY Water and Wastewater Operators Association 57 th Annual Conference Louisville, Kentucky
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Water Treatment Plant and Distribution System Water Treatment Plant
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Are DBPs being formed in the treatment process? Pre-oxidant? Point of Chlorination? –C-T Coagulant dosage? –TOC Removal Enhanced coagulation Alternative compliance (next slide) Requirements Step 2 Operating filters properly? Backwash Triggers Backwash Procedure Meeting turbidity requirements? AWOP goals Source Source Water Alkalinity (mg/L as Ca Co3 Water 0 to 60>60 to 120>120 TOC (mg/L) >2.0 - 4.035%25%15% >4.0 - 8.045%35%25% >8.050%40%30%
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Alternative TOC compliance criteria 1.Source water TOC <2.0 mg/L - Calculated quarterly as a RAA - Used on a monthly basis only when raw water TOC <2.0 mg/L 2.Treated water TOC <2.0 mg/L - Calculated quarterly as a RAA - Used on a monthly basis - Treated TOC sampled no later than at CFE 3.Raw water SUVA ≤2.0 L/mg-m - Calculated quarterly as a RAA - Also used on a monthly basis 4.Treated water SUVA ≤2.0 L/mg-m - Calculated quarterly as a RAA - Also used on a monthly basis - Treated SUVA sampled no later than at CFE 5.Raw water TOC 60 mg/L; TTHM <40 µg/L; HAA5 <30 µg/L - All parameters based on a RAA, computed quarterly - DBP compliance samples used to qualify for this criteria 6.TTHM <40 µg/L and HAA5 <30 µg/L with only chlorine for disinfection - Only plants that use free chlorine a the primary disinfectant
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Distribution System Are DBPs a problem? Representative sampling using a hydrant and/or tap sampler –Meeting minimum chlorine residual? Can changing tank operation improve water quality? –Meeting pressure requirements –Fire Protection –Quantity Flushing program? –Auto Flushers Setting goals? –Compliance –AWOP
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Questions??Comments?? Drinking Water Technical Assistance Don DeKoster—502-429-7122 Jackie Logsdon—270-824-7529 Russ Neal—502-564-3410 ext.4969 Eric Sutton—502-564-3410 ext.4989
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