a partnership for success...a partnership for success –owasa’s optimization journey with the...
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A Partnership for Success –OWASA’s Optimization Journey with the Partnership for Safe Water
NC AWWA-WEA Spring Conference
April 14, 2015
A public, non-profit agency providing water, sewer and reclaimed water services to the Carrboro-Chapel Hill community in North Carolina.
Our Water System
• 3 Reservoirs store 3.5 BG of raw water
• 20 MGD water treatment plant
• 380 miles of distribution pipe
• 2 pressure zones
• 5 system storage tanks
• 21,000 service connections
Reservoir Mixing Clarification Filtration Disinfection Storage Customer
TreatmentSupply Distribution
Commitment to Safe Drinking Water
We provide high quality drinking water through effective management and operation of our water supply,
treatment and distribution system.
OWASA Mission Statement
Why do optimization?
OWASA’s Goals:
• Provide high quality water to customers (under all conditions)
• Identify opportunities to improve service, reliability and water quality
• Develop a workforce that strives for excellence
• Maximize our customers’ capital investment
Why do system-wide optimization?
• Delivering high quality water to our customers is the responsibility of many (not just the WTP Operator)
• Water spends hours at water treatment plant
Why do system-wide optimization?
• Delivering high quality water to our customers is the responsibility of many (not just the WTP Operator)
• Water spends hours at water treatment plant and can spend days in distribution system
Our Process• Joined the Partnership for
Safe Water
– Treatment 2002
– Distribution 2010
• Use a team based, phased approach
• Identify goals
• Self assessment
• Develop action plans
• Track progress
• Celebrate achievements!
Partnership for Safe Water• Over 238 utilities with 441 surface water treatment plants
participate, collectively serving 85 million people.
• Current North Carolina members include:– Brunswick County Public Works– Cape Fear Public Utilities– Charlotte Mecklenburg Utilities– City of Durham- Department of Water Management– City of Greensboro– City of Morganton– City of Mount Holly– City of Raleigh– Fayetteville Public Works Commission– Harnett County Dept. of Public Utilities– Kerr Lake Regional Water System– Orange Water and Sewer Authority– Town of Cary
• Treatment plants that have completed the Phase III self-assessment have lowered finished water turbidity by an average of over 60%.
Partnership for Safe Water
1. Commitment
2. Annual data collection and reporting
3. Self assessment and peer review
4. Optimized performance review (optional)
Supported by: AWWA, EPA, ASDWA, AMWA, NAWC, & Water Research Foundation
Challenges
• Meaningful participation requires ongoing commitment
• The self assessment takes considerable staff time and effort
• It takes time to see change
• Changing culture from meeting limits and “that’s how we’ve always done it” to optimization and continuous improvement is difficult
Data Collection & Performance Goals
• Treatment
— Settled water turbidity < 1.0 ntu
— Individual filter turbidity < 0.1 ntu
— Combined filtered effluent turbidity < 0.1 ntu
• Distribution
— Total chlorine ≥ 0.50 mg/L and ≤ 4.0 mg/L
— Main breaks ≤ 15 breaks/100 miles/yrdeclining 5-year trend
— Pressure ≥20 psi minimumutility specified maximumutility specified maximum fluctuation
What is the self assessment?
• Areas of Assessment
– Performance
– Design
– Operation
– Administration
• Peer reviewed
• Guidance doc’s available from Water Research Foundation & Partnership for Safe Water
How do you use the information?
• Assemble findings into a self assessment report
• Identify and prioritize performance limiting factors
• Create and implement an action plan
• Monitor performance
Benefits of Optimization
The improvements we have seen from optimization include:
• Water Quality
• Operations
• Infrastructure
• Workforce
Water Quality
0.00
0.02
0.04
0.06
0.08
0.102
00
1
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
Turb
idit
y (N
TU)
COMBINED FILTER EFFLUENT TURBIDITY(ANNUAL AVERAGE)
Water Quality
0
10
20
30
40
50
60
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
mic
rogr
ams/
lite
r
DISINFECTION BYPRODUCTS(ANNUAL AVERAGE)
TTHM Stage 1 HAA5 Stage 1 TTHM Stage 2 HAA5 Stage 2
Operations
0
1
2
3
4
0
500
1000
1500
20002
00
2
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
Bill
ion
Gal
lon
s Tr
eat
ed
Nu
mb
er
of
Filt
ers
Was
he
d
NUMBER OF FILTERS WASHED
Filters Washed Water Treated
Water treated has decreased by 26%
Number of filters washed has
decreased by 65%
Operations
0
1
2
3
4
5
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
Mill
ion
Gal
lon
s P
er
Filt
er
Ru
n
WATER TREATED PER FILTER RUN
Infrastructure
0
5
10
15
20
2006 2007 2008 2009 2010 2011 2012 2013 2014
Bre
aks/
10
0 M
iles/
Year
MAIN BREAKS
Goal ≤ 15
Infrastructure
• Capital improvements
• Operation and maintenance
• Capital equipment
Workforce
• Informed, involved, and
empowered
• Highly trained and
certified
• Improved communication
• Team problem solving
• Trust and confidence
Field visit for OWASA’s How2OWASA (H2O) employee training program.
Benefits• Improved service and water quality
• Skilled system operators, with common goals and ownership of the system, dedicated to continuous improvement
• Your customers’ investment in people and facilities working at their best
Resources
• Criteria for Optimized Distribution Systems
– Water Research Foundation, 2010
• Self-Assessment Guide for Surface Water Treatment Optimization
– Water Research Foundation, 1997
Mary Darr, P.EOrange Water and Sewer Authority
Barbara MartinPartnership for Safe Water
American Water Works [email protected]