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HomeMy WebLinkAboutItem 7 PPP 10-07-2020 Operations Committee - City Water Usage k. 1 City Water sa e r-;� � e uc ion Plan 0 _ _} 700 Rob Thompson, Assistant General Manager Operations Committee October 7, 2020 D�Nv y S A N 1 Tq T��2 r R - fa J = C.A. � M,c D( �' THE EN J. Three Types ate AL bill ft APR 41 • • %,a Water ractermistinca, wm • The chemistry of the water types is very different ConductivityAverage Solids . • m) Residual Amount �j M • • - • City Water 8.0 0.62 400 0.5 0.5 Reclaimed 7.1 1.01 650 4 1.0 Water Plant Water 7.7 1.59 1100 2 9.4 3 s- Water Source/Usage OverviewP� IL - Domestic uses, eyewash, fire water City of City of - Irrigation City Water Fountain Huntington - Equipment uses: Hot water loop, boiler makeup, scrubber Valley (P1) Beach (P2) makeup, polymer make-down, heat exchanger/cooling (P1, T&D) Reclaimed Water OCWD - Irrigation - Equipment uses: Pump seals, scrubbers Plant Water Secondary Effluent - Equipment uses: Cen Gen cooling, gas compressor cooling, pump seals, scum spray, washdown 14 Budget FY191Budget 1-2T" -Expense Through AMEMi 411114F (7/31/20L�� A Plant 1 — City Water $542,570 $785,000 $69,000 (8.79%) Plant 2 — City Water $208,130 $210,200 $12,646 (6.02%) Water Usage • Chemical efficiency — Polymer make-down : High total dissolved solids decreases polymer activity. • Bearing Surface and Heat Exchanger Corrosion — High total dissolved solids and chlorides can quickly corrode machined surfaces. • Biofouling prevention — Cooling water in heat exchangers : Biofouling/plugging can occur with Plant Water due to biofilm buildup • Health/safety — Fire water, eyewash , and aerosol regulations. amsiik--A City Water Historical Usages s- at P1 and P2 $90,000 P1 131-Thickening Centrifuge Start $80,000 $70,000 P2 a� $60,000 $30,000 more/month $50,000 P1-Dewatering Centrifuge Start L with Centrifuges $40,000 + P2-Dewatering Centrifuge $30,000 / J L $20,000 $10,000 $0 A N ,�1 tit ti ti� ti� OO ti� ti ti� ti� ti� N�� q� J of ,ate,OO a: as, N�� CPS, ,ate, a, aJ N � • P1 City water usage recently increased with the new centrifuge facility P2Ct W t R eduction- Areas of opportunity identified for city water reduction : • P1 & P2 centrifuge facilities (polymer make-down and scrubbers make-up water P1 ) • Irrigation at P1 and P2 P1 P2 City Water Reduction ♦ Plan Centrifuge Facilities x • Currently polymer make-down uses city water (P1 : 65 gpm, P2: 28 gpm) • Polymer make-down testing with plant water • Vendor jar testing confirmed comparable result with plant water • Testing timeline: • September 2020 - Piping modifications • October 2020 - P1 testing • Will also test reclaimed water as an alternative • If the P1 test is proven effective, P2 make-down test will be conducted Estimated Savings: P1 : $15,000/month saving P2 : $6,400/month saving P1 & City Water Reduction Plan ig Irrigation : Available Alternatives ✓ Replacing city-water pipes with reclaimed water pipes ✓ Drought tolerant landscape ✓ Smart landscape watering and leak detection d` i e' a All •a r �