Jordan Lake Committee Legislative Research Commission · A public, non-profit agency providing...
Transcript of Jordan Lake Committee Legislative Research Commission · A public, non-profit agency providing...
Orange Water and Sewer Authority Presentation
Jordan Lake Committee Legislative Research
Commission
March 19, 2014
Raleigh
Charlotte
Greensboro
Fayetteville
Wilmington
OWASA
Chapel Hill/Carrboro/UNC
Durham
A public, non-profit agency providing water, sewer and reclaimed water services to the Carrboro-Chapel Hill community in North Carolina.
Orange Water and Sewer Authority
80,000 people
21,000 accounts
UNC 22% of sales
20 MGD Water Treatment Plant
14.5 MGD Wastewater Treatment Plant
3 MGD Reclaimed Water System
OWASA provides drinking water
University Lake
THE DRINKING WATER SYSTEM
Reservoir Mixing Clarification Filtration Disinfection Storage Customer
Treatment Supply Distribution
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OWASA provides drinking water THE DRINKING WATER SYSTEM
Reservoir Mixing Clarification Filtration Disinfection Storage Customer
Treatment Supply Distribution
Cane Creek Reservoir
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Quarry Reservoir
OWASA provides drinking water THE DRINKING WATER SYSTEM
Reservoir Mixing Clarification Filtration Disinfection Storage Customer
Treatment Supply Distribution
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OWASA provides drinking water
Jones Ferry Road Water Treatment Plant
THE DRINKING WATER SYSTEM
Reservoir Mixing Clarification Filtration Disinfection Storage Customer
Treatment Supply Distribution
OWASA provides drinking water
THE DRINKING WATER SYSTEM
Reservoir Mixing Clarification Filtration Disinfection Storage Customer
Treatment Supply Distribution
Includes interconnections with
Durham, Hillsborough and
Chatham County
Jordan Lake Allocation = 5 MGD
Provides essential backup when
needed
OWASA manages wastewater
THE WASTEWATER MANAGEMENT SYSTEM
Customer Manhole Pumping Headworks Primary
Clarification
Aeration
Basins
Secondary
Clarification Filtration Disinfection Morgan Creek
Reclaimed
Water to UNC
Anaerobic
Digesters
Biosolids to
Land Application Sewer
crossing
a creek Rogerson Drive Pump Station
Mason Farm
Wastewater
Treatment Plant
OWASA manages wastewater THE WASTEWATER MANAGEMENT SYSTEM
Customer Manhole Pumping Headworks Primary
Clarification
Aeration
Basins
Secondary
Clarification Filtration Disinfection Morgan Creek
Reclaimed
Water to UNC
Anaerobic
Digesters
Biosolids to
Land Application
OWASA manages wastewater
UNC uses
reclaimed
water for 30%
of their total
water demand
THE WASTEWATER MANAGEMENT SYSTEM
Customer Manhole Pumping Headworks Primary
Clarification
Aeration
Basins
Secondary
Clarification Filtration Disinfection Morgan Creek
Reclaimed
Water to UNC
Anaerobic
Digesters
Biosolids to
Land Application
Operator checks
reclaimed water pumps
Mason Farm Wastewater Treatment Plant
Primary Treatment
Headworks
UV Disinfection
Filtration & Denitrification
Enhanced Secondary Treatment
Discharge to Morgan Creek
Reclaimed Water
Biosolids
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WWTP Discharger Requirements
Jordan Lake Rules
Individual N and P Load Allocations (lbs/year)
Upper New Hope N = 3.04mg/l P = 0.23 mg/l
Compliance Dates P = 2010 N = 2018
OWASA Fully Compliant with current NPDES
Permit Requirements for N and P
Recent NCDWR Presentation to JLR Committee
“misrepresented” OWASA’s N compliance status
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0
500
1,000
1,500
2,000
2,500
3,000
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
2006 2007 2008 2009 2010 2011 2012 2013
F
L
O
W
T
N
L
O
A
D
TP Load
TP LIMIT
FLOW
Summary of TP Compliance – WWTP EFF
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0
500
1,000
1,500
2,000
2,500
3,000
0
50,000
100,000
150,000
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250,000
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350,000
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450,000
2006 2007 2008 2009 2010 2011 2012 2013
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L
O
W
T
N
L
O
A
D
TN Load
Pre 2018 Limit
Post 2018 Limit
FLOW
"GAP" = 15,747 lbs at present avg. flows this translates to needed removal of approximately 1 mg/l of additional TN reduction
Summary of TN Compliance – WWTP EFF
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0.00
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2.00
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-06
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M
G
D
m
g
/
l
TN
AVG - TN
NO3-N
AVG - NO3-N
Proposed NO3-NLimit
Flow
Implementation of step feed ops
In addition to chemical feed optimization
WWTP Nutrient Optimization Strategies
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Capital Investments (current) = $ 22.5 Million
• Fermenter Modifications - $455,000 (P removal)
• Acetic Acid / Alum Improvements = $472,000 (P removal)
• Nutrient Reduction/Optimization Study = $234,000 (N and P removal)
• On-Line Nutrient Analyzers = $170,000 (N and P Removal)
• NSL Pump Station = $390,000 (P Removal)
• Aeration Basin Modifications = $6.5 million (N and P removal)
• Secondary Clarifier Improvements =$3.9 million (N and P removal)
• Effluent Filters = $10.4 million (mostly N – but also some P removal)
Capital Investments (future) = $ 1.9 Million +
• Internal Recycle - Activated Sludge System = $900,000 (N removal)
• Side Stream Treatment = $1M+ (N & P removal)
OWASA Capital Investments
N and P Compliance
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Chemical Utilization Annual Costs (current)
•Acetic Acid & Alum = avg. @ $300,000 (P removal)
•Caustic = avg. @ $250,000 (N removal)
Chemical Utilization Annual Costs (future)
•Acetic Acid = $350,000 - $500,000 additional annual
costs to operate denitrification filters (N removal)
Total Chemical Costs = Upwards of $1 Million/Year
OWASA On-Going O&M Costs
N and P Compliance
10,000
12,000
14,000
16,000
18,000
20,000
22,000
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
Cu
stom
er A
ccou
nts
Wat
er
Sale
s (m
illio
n g
allo
ns
pe
r d
ay a
vera
ge)
Actual Water Sales Accounts
Water Sales and Accounts Growth In Water Sales Decline In Water Sales
UNC Reclaimed
Water Use
Begins
Approved Rate Increases
2007 10%
2008 17%
2009 10%
2010 9%
Needed to Fund Capital Improvements (N & P Compliance)
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OWASA N and P Compliance
Fully Compliant with NPDES P load allocation
(10,188 lbs/year)
Fully Compliant with current NPDES N load
allocation (409,448 lbs/year)
OWASA will be fully compliant with future
NPDES N load allocation (134,375 lbs/year)
when limit takes effect in 2018
www.owasa.org
A public, non-profit agency providing water, sewer and reclaimed water services to the Carrboro-Chapel Hill community.
John Kiviniemi Wastewater Treatment and Biosolids
Recycling Manager
[email protected] 919-537-4352