iowa city nutrient reduction study...•aww/mww flows of 13/19 mgd were significantly lower than the...
TRANSCRIPT
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Iowa City Nutrient Reduction Study
IAWEA 2016 Annual Conference
Jay Brady, P.E.
June 8, 2016
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Presentation Overview
• Plant Background
• Process Configurations
• Study Drivers
• Flows and Loadings
• Performance – Nitrogen
• Performance – Phosphorus
• Potential NPDES Permit Limits
• Supplemental Technologies
• Observations
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IC South WWTP The culmination of a 40 year vision of
migrating wastewater treatment out of the city
Chuck Meyer, P.E. Chief Civil Engineer Stanley Consultants
Chuck Schmadeke, P.E. Public Works Director City of Iowa City
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NORTH WWTP
SOUTH WWTP
Iowa River
South Plant ~ 15 years of conception, planning, and study work Constructed 1990 5 mgd Capacity BOD Removal, Surface Aerators Serves SE Iowa City
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NORTH WWTP
SOUTH WWTP
Iowa River
Napolean Park Lift Station
Connector Infrastructure Constructed in 1996-1999 84/96 inch trunk sewers Napolean Park Lift Station
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South Plant – 2003
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7
2003 MLE Process – Nitrification & Denitrification
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North Plant – 2008 Flood
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NORTH WWTP
SOUTH WWTP
Iowa River
Napolean Park Lift Station
South Plant Expanded in 2012-14 to 24 mgd and Significant Organic Load Capacity Nutrient Reduction – MLE/A2O Processes $46 million Investment N. Plant Closed and Decommissioned 2015
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Design Flows and Loads
S. Plant N & S Plants 2025
Flow (mgd) 10/25/60 18.6, 33.1, 45 24, 43/30, 62
BOD5 (lb/d) 16,554 21,643 32,658
TSS (lb/d) 17,000 22,075 34,385
TKN (lb/d) 2,940 4,665 6,311
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Plant Process Configurations - MLE
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The BAR Process
13
Bioaugmentation
R = Reaeration or Regeneration
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Plant Process Configurations – A2O
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Study Drivers
• Iowa Nutrient Reduction Policy (INRP)
• NPDES Permit Requirements:
– Plant Optimization Study
– Evaluation of Possible Upgrade Requirements
– 66% TN Reduction, 75% TP Reduction or
10/1 mg/L effluent values
• Focus: Operational
Adjustments/Optimization for Nutrients
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Flows and Loads
0
5
10
15
20
25
30
35
40
45
ADW ADF AWW MWW
Flow, mgd
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Flows and Loads
Average Max Month Max Day 0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
45,000
50,000CBOD5, lbd
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Flows and Loads
Average Max Month Max Day 0
10,000
20,000
30,000
40,000
50,000
60,000
70,000TSS, lbd
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Flows and Loads
Average Max Month Max Day 0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000TKN, lbd
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Flows and Loads
Average Max Month Max Day 0
200
400
600
800
1,000
1,200
1,400TP, lbd
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Flows and Loads
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Flows and Loads
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Optimization Trial
• North Plant shutdown February 7, 2014
• MLE Mode February – December 23, 2014
• A2O Mode December 23, 2014 – March 31, 2016
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MLE Operational Performance - TN
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MLE Operational Performance - TP
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A2O Operational Performance - TN
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A2O Operational Performance - TP
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Estimated Nutrient Mass Limits
• Assumes log distribution of data
• 99th percentile TNe, TPe
• Compute mass limits based on Design AWW
Parameter Allowable Average Mass Loading, lb/d
At Max Month design flow, mg/L
At Design ADF, mg/L
TN 2,148 10.6 17.8
TP 319 1.6 2.6
Must operate Nutrient Reduction Systems
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Supplementary Technologies
• Increased Internal Mixed Liquor Recycle (IMLR)
• Primary Sludge Fermenter
• Ferric Chloride Addition
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Supplementary Technologies - IMLR
• 2012 design re-used some original piping for the
the IMLR resulting in IMLR capacity of 25 mgd or
~2:1 ratio to influent Q for average flows at the
2025 design flow. A IMLR of 3 or 4:1 is ideal for
optimal TN reduction.
• Additional piping and changes to the IMLR
pumping would be required to optimize the
IMLR:Qo Ratio
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Supplementary Technologies - Fermenter
• Volatile Fatty Acids (VFAs) aka soluble
biodegradable chemical oxygen demand are
necessary at the right ratios for both TN and TP
reduction.
• Primary clarifier fermenter is one way of producing
and providing a more consistent source of VFAs
for BNR.
• Need for a fermenter would be due to changing
influent wastewater conditions
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Supplementary Technologies – FeCl3
• Option to improve MLE TP reduction by addition at
aeration basin discharge or to BFP operation.
• Also could be needed for A2O if wastewater
conditions change
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Supplementary Technologies – Costs
Technology 20-Yr PW Cost
IMLR Increase $2,500,000
Fermenter $5,000,000
Ferric System $3,000,000
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Observations
BNR Favorable Influent Characteristics
• Higher influent cBOD5 loadings provide more
organic carbon increasing C:TKN and C:TP ratios.
• AWW/MWW flows of 13/19 mgd were significantly
lower than the historical AWW/MWW flows of
18/29 mgd
• Minimum monthly influent temperature of 15oC is 3
degrees warmer than the basis of design favoring
nitrification kinetics and BNR performance.
• Future conditions could reduce the performance of
the nutrient removal systems.
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Observations
A2O Mode
• Achieved TN Reduction of 74%
• Achieved TP Reduction of 82%
• Inconsistent Enhanced Biological Phosphorus
Removal (EBPR) aka ‘Bio-P’ observed and as
predicted by planning/design modeling
• Anaerobic selector PO4-P release suggests some
EBPR activity but not substantial
• A2O mode appears capable to meeting reduction
requirements under current wastewater conditions
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Observations
MLE Mode
• Achieved TN Reduction of 75%
• Achieved TP Reduction of 72% (slightly below
target)
• Additional MLE operational trialing recommended
with increased IMLR and addition of ferric chloride
to belt filter press sludge feed
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Observations
Investment in additional nutrient reduction
technologies is not warranted at this time.
Future investment may be necessary if BNR
performance declines due to changing wastewater
conditions or increased loadings
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Acknowledgements
WWTP Staff – Dave Elias (retired), Tim Wilkey, Roger Overton, Al Figueroa, Steve Flake, Laboratory Staff Don Esping and Lloyd Winchell, BC Process Team
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Discussion