evaluation of the multi-port diffuser system for the ... pncwa...presentation outline brief...
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Evaluation of the Multi-Port Diffuser Systemfor the Lebanon WWTP
Kwabena Adu-Sarkodie, P.E.
Sept. 15, 2009
Presentation Outline
Brief Regulatory Overview
Existing Outfall/Detailed Design
Protocol for Performance Evaluation
Preliminary Results of Evaluation andNext Steps
Presentation Outline
Brief Regulatory Overview
Existing Outfall/Detailed DesignExisting Outfall/Detailed DesignExisting Outfall/Detailed Design
Protocol for Performance EvaluationProtocol for Performance EvaluationProtocol for Performance Evaluation
Preliminary Results of Evaluation andPreliminary Results of Evaluation andPreliminary Results of Evaluation andNext StepsNext StepsNext Steps
Mixing Zone Overview
The dilution credit is a numerical value
associated with the mixing zone that is used
in the calculation of effluent limitations
Regulatory Requirements/Dilution Ratios in OR
In Calculating Dilution Ratio for:
Use The Critical Receiving Water Flow of:
Use Critical Plant Flow of:
Acute Aquatic Life Criterion
1Q10
Average Dry Weather Flow
Chronic Aquatic Life Criterion
7Q10
Human Health Criterion
Harmonic Mean (Carcinogens)
30Q5 (Non-Carcinogens)
1Q10 - Lowest flow that occurs for one day with a statistical frequency of once every 10 years. 7Q10 - Average low flow that occurs for seven consecutive days with a statistical frequency of once every 10 years.
30Q5 - Lowest average low flow that occurs for 30 consecutive days with a statistical frequency of once every 5 years.
Overall Site View
Lebanon WWTP
New Outfall DiffuserNew Outfall Diffuser
Existing OutfallRegulatory
Mixing Zone
South Santiam River
Existing Outfall Pipeline to the South Santiam River
Comparison Between Plant Data and Allowable Limits
0.25
0.3
0.35
0.4
6
7
8
9
NPDES
Plant Data Plant Data
8.20.37
0
0.05
0.1
0.15
0.2mg/L
Chlorine Residual
NPDES - Monthly Average
NPDES - Daily Maximum
Plant Data - Monthly Average (Sept. 2002-2004)
Plant Data - Daily Maximum (Sept. 2002-2004)
0
1
2
3
4
5mg/L
Ammonia
NPDES - Monthly Average
NPDES - Daily Maximum
Plant Data - Monthly Average (Sept. 2002-2004)
Plant Data - Daily Maximum (Sept. 2002-2004)
NPDES NPDES
0.941.89
5.6
0.01 0.02
0.18
Mixing Zone at South Santiam RiverZID = Zone of Initial Dilution (Acute Mixing Zone)
CMZ = Chronic Mixing Zone
10 ft100 ft
Objective: Design discharge for appropriate mixing at the boundary zone
Flow Direction
Strategy for Improving MixingStatistical Analysis1Q10 , 7Q10 , 30Q5,
Harmonic Mean, Plant Flow
Statistical Analysis1Q10 , 7Q10 , 30Q5,
Harmonic Mean, Plant Flow
Modeling Verification
Detailed DesignDetailed Design
CORMIX ModelingCORMIX Modeling
Plant Data
Parameter2024(mgd)
Build-Out(mgd)
Average Dry Weather Flow (ADWF) 3 5
Average Wet Weather Flow (AWWF) 8 14
Max. Month Dry Weather Flow (MMDWF) 7 12Max. Month Dry Weather Flow (MMDWF) 7 12
Max. Month Wet Weather Flow (MMWWF) 12 21
Peak Day Flow (PDF) 20 26
Peak Wet Weather Flow (PWWF) 26 36
River Data
Parameter Value, cfs Value, mgd
1Q10 / 7Q10 450 291
Harmonic Mean 1380 892Harmonic Mean 1380 892
30Q5 540 349
CORMIX Model
• General Features§ Uses N.S. Equations to Predict Mixing Conditions after Plume is Discharged
§ Dimensions Parameters Used to Define Different Portions of Flow
§ Steady State Conditions§ Single Port Diffusers, Multi-Port Diffusers, Surface Discharge Conditions
Graphical Representation
Presentation Outline
Brief Regulatory OverviewBrief Regulatory OverviewBrief Regulatory Overview
Existing Outfall/Detailed Design
Protocol for Performance EvaluationProtocol for Performance EvaluationProtocol for Performance Evaluation
Preliminary Results of Evaluation andPreliminary Results of Evaluation andPreliminary Results of Evaluation andNext StepsNext StepsNext Steps
Detailed Design
Duck-billed Check Valve, Typical of 11
Presentation Outline
Brief Regulatory OverviewBrief Regulatory OverviewBrief Regulatory Overview
Existing Outfall/Detailed DesignExisting Outfall/Detailed DesignExisting Outfall/Detailed Design
Protocol for Performance Evaluation
Preliminary Results of Evaluation andPreliminary Results of Evaluation andPreliminary Results of Evaluation andNext StepsNext StepsNext Steps
Model VerificationDye Used Yellow Green Xanthene
Dye
Supplier Kingscote Chemicals
Approved National Science Approved National Science Foundation
Reported Minimum Dilution
10ppb (10 µg/L)
Actual Visual Limit(Based on River Water)
10 mg/L
Testing Protocol
Water Tank
Weir River
Model Verification
Buoy
~ 4 mins
Green Dye Exiting at the Ports Closest to the West Bank
Plume is fully developed and Green Dye Exits all 11 Ports
~ 12 mins
Model VerificationIndividual Effluent Streams
Plume is Distinctly Demarcated at 11 Ports
Plume is Homogeneous 100 Feet Downstream of the Discharge Port Buoys
Homogeneous Plume
~ 9 mins
~ 9 mins
Model Verification
Mixing Zone: Plume is Rectangular in Shape, as Predicted by CORMIX Model
100-Foot Mark
80-Foot Mark
60-Foot Mark
~9.5 -10 mins
Comparison of PredictionsScenario
Bulk Average Plume Dilution
at CMZ(a)
River Flow = 450 cfs (292 mgd) (1Q10/7Q10)Plant Flow = 3 mgd (Design/Year 2024)
26.6
River Flow(b) = 450 cfs (292 mgd) (1Q10/7Q10)Plant Flow(b) = 5 mgd (Build-Out ADWF)
17
River Flow = 540 cfs (349 mgd) (30Q5)Plant Flow = 3 mgd (Design/Year 2024 ADWF)
30.6
River Flow = 540 cfs (349 mgd) (30Q5)Plant Flow = 5 mgd (Build-Out ADWF)
19.3
River Flow = 1,380 cfs (892 mgd) (Harmonic Mean)62.1
(a) ZID was modeled at 10 feet downstream from the multi-port diffuser; CMZ was modeled as being 100 feet from the multi-port diffuser.
(b) The conditions indicated are the worst case scenario, and is therefore the minimum dilution expected.River Flow = 1,380 cfs (892 mgd) (Harmonic Mean)
Plant Flow = 3 mgd (Design/Year 2024 ADWF)62.1
River Flow = 1,380 cfs (892 mgd) (Harmonic Mean)Plant Flow = 5 mgd (Build-Out ADWF)
37.9
River Flow = 1,380 cfs (892 mgd) (Harmonic Mean)Plant Flow = 7 mgd (Design/Year 2024 MMDWF)
27.9
River Flow = 1,380 cfs (892 mgd) (Harmonic Mean)Plant Flow = 12 mgd (Design/Year 2024 MMWWF)
17.3
River Flow = 6,000 cfs (3,878 mgd) (MMWWF)Plant Flow = 12 mgd (Design/Year 2024 MMWWF)
55.6
River Flow = 6,000 cfs (3,878 mgd) (MMWWF)Plant Flow = 21 mgd (Build-Out MMWWF)
32.7
River Flow(c) = 1,670 cfs (1,079 mgd)Plant Flow(c) = 1.05 mgd (Plant Operating Condition)(d)
minimum dilution expected.
(c) The conditions indicated here are the actual conditions that the preliminary experiment was conducted.
(d) Plant flows from 08/22/08-10/08/08 were from 1.0-2.2 mgd.
ADWF = Average Dry Weather FlowAWWF = Average Wet Weather FlowMMDWF = Maximum Month Dry Weather Flow MMWWF = Maximum Month Wet Weather Flow
Presentation Outline
Brief Regulatory OverviewBrief Regulatory OverviewBrief Regulatory Overview
Existing Outfall/Detailed DesignExisting Outfall/Detailed DesignExisting Outfall/Detailed Design
Protocol for Performance EvaluationProtocol for Performance EvaluationProtocol for Performance Evaluation
Preliminary Results of Evaluation andNext Steps
Next Steps
• Develop Final Test Protocol• Conduct Final Test• Prepare Report for DEQ on behalf of City • Prepare Report for DEQ on behalf of City of Lebanon
Acknowledgements
• City of Lebanon• Department of Environmental Quality• Mark Zinniker, P.E. – Project Manager• Mark Zinniker, P.E. – Project Manager• Laura Farthing, P.E. – Project Engineer• Corie Peterson, P.E. – Project Manager/Engineer
Questions