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
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Ip
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,aao +ass tom ipm
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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)
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Collection System
• Sanitary products
• Oil and Grease
• More frequent cleaning for OCSD small pipes (< 18" )
• Root intrusion into city sewer pipes
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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,
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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. ..
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