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HomeMy WebLinkAboutITEM 20B - Impacts of Water Conservation Iwo 46 Am/of iA Impacts of reduce flow on OC"" 1 Background Stafewl0e AverW PreWpdaLpn Ey water yoar r _ 1 b v t5 Ip s p t'T^ IMU 1965 ,aao +ass tom ipm I97U � y„ WNW Yw d' r • 4-year period driest years between fall 2011 and fa I I 2015 (since recorded from 1895 ) • 2014 and 2015 being the two hottest years in the state's recorded history )k '`, a a Be MWD (AFY) Recycled (AFY) 300,000 400,000 250,000 - 350,000 300,000 200,000 - 250,000 150,000 200,000 100,000 - - 150,000 _ 100,000 50,000 50,000 0 0 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 OCWD Basin GW (AFY) 400,000 350,000 { 300,000 - 250,000 200,000 150,000 W 100,000 50,000 0 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 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) t I40 - � 1 1 � :,`SWIMMING L � : 1 . 1 � 1 1 11 11 11 1 1 1 1 1 1 � 1 1 1 �1 Collection System • Sanitary products • Oil and Grease • More frequent cleaning for OCSD small pipes (< 18" ) • Root intrusion into city sewer pipes yl' t •� � � �r :t i 1 O ' Influent Water Constituents 40 Ammonia (mg/1) 35 30 Glt 25 - 'r 20 - 15 10 ' 5 0 2010 2011 2012 2013 2014 2015 2016 2017 TSS (mg/1) 400 350 Pollution (mg/1) Water Treatment 300 250 200 150 2010 2011 2012 2013 2014 2015 2016 2017 v Flow (MGD) Electricity (kWh) �_r`_ - � Pollution (mg/1) Electricity (kWh) Normalized Consumption (kWh/MG) Electricity 250u Consumption 2000 1500 1000 500 0 :�� 2011 201i 2013 2014 2015 2016 2017 Chemical Usage • Collection (reverse impact) (Calcium Nitrate; Ferrous Chloride; Caustic; Mag. Hydroxide) Flow (MGD) Odor & Corrosion Chemicals • Plants (correlated) _ and Cationic Pol mer(Anionic Polymer) FERRIC ( Bleach, Caustic, Ferric Chloride) a . -ORIO, CHLORIDE ,, GAL WORK, � 1I Flow (MGD) Chemicalsget i "TH,"LARM i Suspended Solids (mg/1) 9.00 360 8.00 350 7.00 6.00 340 5.00 330 4.00 3.00 320 2.00 310 1.00 0.00 300 , 2011 2012 2013 2014 2015 2016 Effluent(*) Influent Eli--e aen�nxrJ�x�Samc�nea Summary • 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 Sister Agencies ( LA County San .) Collection System : • Elevated H2S —> Increased odors and corrosion • Increased blockages ` r Plants • Increase in effluent ammonia levels due to the increased influent ammonia concentrations • Difficulty meeting the permit limits (due to the increased pollution concentration) California Water Water i:rASA WATEREUSE Environment Research CALIFORNIA Association Foundation Association of California Water Agencies CALIFORNIA URBAN WATIR AGENCIES Of the impacted Of the impacted Of the impacted wastewater wastewater treatment recycled water conveyance respondents, 68% respondents, 70% respondents, 50% indicated changes in indicated a decrease in indicated increased wastewater influent recycled water solids deposition, quality. production. odor problems, and 0&M challenges. .. 0 N Thanks f. 4 S VC~�� r4 1K,