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HomeMy WebLinkAbout97.Item 6B PPP 09-12-18 Admin Comm - Impacts of Water ConservationImpacts of reduced flow on OCSD Reza Sobhani Associate Engineer Administration Committee Meeting Sep. 12th, 2018 Enforcemen t StrategyDrought in California Potential Impacts •Flow •Collection System •Influent water characteristics •Effluent Water Quality (Turbidity, TSS) •Total Energy Consumption and Energy Efficiency •Chemical Consumption Average Daily Influent Flow (MGD) 100 120 140 160 180 200 220 240 260 2005 2007 2010 2011 2012 2013 2014 2015 2016 2017 Collection System •More solids deposition •Sanitary products •Oil and Grease •More frequent cleaning for OCSD small pipes (<18”) •Root intrusion into city sewer pipes Influent Water Constituents 0 5 10 15 20 25 30 35 40 2010 2011 2012 2013 2014 2015 2016 2017 Ammonia (mg/l) 150 200 250 300 350 400 2010 2011 2012 2013 2014 2015 2016 2017 Suspended solids (mg/l) Pollution (mg/l)Water Treatment Electricity Consumption 0 500 1000 1500 2000 2500 2011 2012 2013 2014 2015 2016 2017 Normalized Consumption (kWh/MG) Chemical Usage Cationic Ferric Chloride Caustic Peroxide Mag. Hydroxide Ferrous Chloride •Collection (reverse impact) •Odor and corrosion control chemicals •Plants (correlated) Coagulants and odor control Flow (MGD)Odor & Corrosion Chemicals Flow (MGD)Chemicals Effluent Quality ** 300 310 320 330 340 350 360 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 2011 2012 2013 2014 2015 2016 Suspended Solids (mg/l) Effluent(*)Influent Bottom Line •Plants’ Influent Flow (decreased due to the long-term water conservation and drought) •Collection System (direct impact) •Influent water characteristics (higher concentration) •Effluent Water Quality (stable-improved) •Biosolids (no correlation) •Energy Efficiency (negative impact) •Chemical Consumption •Collection:negative impact •Plants: correlated with flow Impacts on Other Agencies Thanks