nutrient control at ncac wwtp - kwea and ksawwa … solids thickening aeration secondary...
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NUTRIENT CONTROL AT NCAC WWTP
Patrick Denning, Johnson County Wastewater & Nathan White, Black & Veatch
Introduction
Expansion Project
Operation
AGENDA
2
PATRICK DENNING
INTRODUCTION
3
New Century Air Center WWTP is located at the top of the Little Bull Creek Watershed at the location of the former Naval Air Station
4
Solids ThickeningHeadworks
Aeration
Secondary Clarification
UV Disinfection
WWTP Summary:
• Average Flow = 0.75 MGD
• Design Flow = 1.65 MGD
• Total P TMDL Limit = 8 lbs/d
• Total N Goal = 127.7 lbs/d
• Primarily serves industrial customers (food processing)
• Staff of 8, single shift, 7 days/week
INTRODUCTION
5
Black & Veatch
Black & Veatch6
Historical LoadingConstituent Avg Conc. (mg/L) High/Med/Low
M&E, 4th ed
COD 1,020 High (800)
NH3-N 7.3 Low (12)
TP 9.1 Med-High (7-12)
INTRODUCTION
7
INTRODUCTION
Black & Veatch7
Load Challenges
• High COD Loading
• Significant Loading Swings
• Not Diurnal – Tougher to Predict
• N and P are at times limiting biological growth –has led to operational challenges in the past
7
NATHAN WHITE
EXPANSION PROJECT
8
Black & Veatch9
EXPANSION PROJECT
Phased Implementation
9
Black & Veatch10
EXPANSION PROJECT
Phase 1(Operations & Regulatory)
Gearless Turbo Blowers
Chemical Feed
Final Clarifier Splitter
Continuous Sludge Wasting
SCADA
Phase 2(Growth)
Aeration Basin
Final Clarifier
Sludge Pump Station
• Auto start/stop
• Auto flow control
• Improved efficiency
Black & Veatch11
Gearless Turbo
Blowers
EXPANSION PROJECT
Aeration Controls
• Airflow control valve per basin
• DO or flow mode in basins
• Auto pressure control
Black & Veatch12
EXPANSION PROJECT
• Dedicated pump for each basin
• Feed forward control based on basin airflow
• Feed back control from online nitrate analyzers at each basin
Black & Veatch13
Nitrogen Feed
EXPANSION PROJECT
Phosphoric Acid Feed
Black & Veatch14
EXPANSION PROJECT
• Dedicated pump for each basin
• Feed forward control based on basin airflow
• Feed back control from online ortho-P analyzer after final clarifiers
• Feed back control from online ortho-P analyzers after final clarifiers
Black & Veatch15
Alum Feed
EXPANSION PROJECT
New Aeration Basin
New Sludge Pump Station
New Final Clarifier
New Final Splitter
16
Current Site
PATRICK DENNING
OPERATION
17
Black & Veatch18
Dissolved Oxygen Control
0
1
2
3
4
5
6
7
8
12/27/2014 12/27/2015 12/26/2016
mg/L
Average Daily Aeration Basin DO (mg/L)10-Day Average
OPERATIONS
Black & Veatch19
Automation and Power Savings
0
5,000
10,000
15,000
20,000
25,000
30,000
11/22/2013 06/10/2014 12/27/2014 07/15/2015 01/31/2016 08/18/2016 03/06/2017 09/22/2017 04/10/2018
KW
h/M
GD
Tre
ate
d (
To
tal P
lan
t)
KWh/MGD Treated 30 -Day Average
• Power Savings have been inconclusive
• Blower programming optimization as of May 1, 2017 may be reducing some power usage
• Separate meter to track power
OPERATIONS
Black & Veatch20
Effluent Nitrate and Total Nitrogen Improvements
OPERATIONS
Black & Veatch21
Effluent Total Phosphorus Improvements
TP concentration to achieve TMDL
OPERATIONS
• Automation is a process, not an event
• Optimizing Automation must consider high/low loading and how quickly swings occur
• Understanding of the automation logic is necessary for troubleshooting
• Design of automation logic must include manual setpoints/overrides
• Staff duties change, are not necessarily reduced
Black & Veatch22
OPERATIONS
Automation Considerations
New Century Air Center WWTP Staff Receiving NACWA Platinum Award
23Black & Veatch
Acknowledgements
Johnson County WastewaterSusan PekarekAaron WittTami LorenzenDoug NolkemperTim EngbrotenJohn ManisRick Beery
Black & VeatchDerek CambridgeJohn KellerEd KobylinskiTyler BrannanJoe RasmussenAngelo Covert
Phase 1 & 2 Construction ProjectCrossland Heavy ContractorsDavin ElectricR.E. Pedrotti
Contact Us
Patrick Denning, PE | Project Engineer4800 Nall Ave, Mission, KS 66202P +1 913-715-8562 | E [email protected]
Nathan White, PE | Engineering Manager8400 Ward Parkway, Kansas City, MO 64114P +1 913-458-3003 | E [email protected]