nitrogen removal in advanced owts within the narragansett ......george loomis dave kalen kevin hoyt...
TRANSCRIPT
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Optimizing Nitrogen Removal in Advanced
OWTS Within the Greater
Narragansett Bay Watershed
Brittany Lancellotti
Laboratory of Soil Ecology
and Microbiology
University of Rhode Island
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Special Thanks to…
The Amador Lab:
Jose Amador
George Loomis
Dave Kalen
Kevin Hoyt
Ed Avizinis
Robert Bercaw
Ingrid Felsl
Lauren Zeffer
Jennifer Cooper
Ashley Waggoner
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Although the information in this presentation has been funded
wholly or in part by the United States Environmental Protection
agency under agreement CE96184201 to NEIWPCC, it has not
undergone the Agency’s publications review process and therefore,
may not necessarily reflect the views of the Agency and no official
endorsement should be inferred. The viewpoints expressed here do
not necessarily represent those of the Narragansett Bay Estuary
Program, NEIWPCC, or EPA, nor does mention of trade names,
commercial products, or causes constitute endorsement or
recommendation for use. Results discussed in this document are
preliminary and have not been reviewed by NEIWPCC or NBEP.
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Overview
1. Project description
2. Evaluation of rapid field tests
3. Performance of Advanced N removal
OWTS in the Narragansett Bay
Watershed
4. Predictors of effluent total nitrogen
5. Conclusions
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Nitrogen Loading and Coastal Ecosystems:
Rhode Island
Algal Bloom-
Narragansett Bay
Fish Kill-
Greenwich Bay
Conventional Systems:
0-30 % N Removal
NH4+
NO3-
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Addressing Eutrophication
Advanced Nitrogen Removal OWTS
19 mg N/L Total Nitrogen Final
Effluent Standard
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Advanced N Removal OWTS
Groundwater
Soil
Septic TankAdvanced Treatment
Train
NH4+
N2
NO3-
N2O
NH4+
NO3-
Nitrification
50-75% TN Removal
NO3-
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Advanced OWTS in Rhode Island: Considerations
Effluent N
concentrations not
monitored after
installation
Installation and
maintenance
may affect
system
performance
Uncertainty
surrounding
performance
N inputs to
coastal
systems could
be higher than
expected
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Our Approach:
Monitor system
performance and
operational
parameters
Develop statistical
model for
performance
optimization
Adjust systems
accordingly
Measure changes in
response to
adjustments
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Sampling Design
We sample a total of 42 systems each
month:
Orenco
Advantex
AX20®
BioMicrobics
FAST®SeptiTech
D®
17 Systems 11 Systems14 Systems
http://www.orenco.com/sales/choos
e_asystem/index.cfm
http://www.biomicrobics.com/produc
ts/fast-wastewater-treatment-
systems/microfast/
http://www.septitech.com/staar-residential/
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Site Locations: Greater Narragansett Bay
Watershed
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Methodology: Operational Parameters
Field Analysis Lab Analysis
Avg. Daily Forward Flow
Recirculation Ratio
Water Temperature
BOD5
COD
Total Nitrogen
Alkalinity
DO
NH4+
NO3-
pH
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Overview
1. Project description
2. Evaluation of rapid field tests
3. Performance of Advanced N removal
OWTS in the Narragansett Bay
Watershed
4. Predictors of effluent total nitrogen
5. Conclusions
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Evaluation of Rapid Field Tests
Used by O&M service providers to evaluate system
performance
Provide quick results on-site
Do they provide accurate results?
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Evaluation of Rapid Field Tests: Methods
Rapid Field
Tests
Standard
Laboratory
Methods
?
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Standard Values
0 10 20 30 40 50 60 70
Ra
pid
Te
st
Va
lue
s
0
10
20
30
40
50
60
70NH4
+
Laboratory Values
Ra
pid
Fie
ld T
est
Va
lue
s
How is Accuracy Defined?
0 1 2 3 4 5 6 7 8 9 10
0
1
2
3
4
5
6
7
8
9
10
Laboratory Values
Ra
pid
Fie
ld T
est
Va
lue
s
Slope= 1
Intercept= 0
Slope= 1?
Intercept= 0?
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Rapid Field Test Methods
Alkalinity
Ammoniu
m
Dissolved
Oxygen
Nitrate
pH
pH✔
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Rapid Field Test Methods : Used in the
Laboratory
Alkalinity
Ammoniu
m
Nitrate
pH✔ ✔
✔✔Field
Conditions Accuracy
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Field Conditions and Error
Varying light
conditions in the field
complicate visual
comparisons to color
charts.
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Accurate Rapid Field Test Methods
NitratepH✔ ✔Ammoniu
m✔
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Overview
1. Project description
2. Evaluation of rapid field tests
3. Performance of Advanced N removal
OWTS in the Narragansett Bay
Watershed
4. Predictors of effluent total nitrogen
5. Conclusions
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Evaluation of N Removal in Advanced
OWTS
Final effluent total nitrogen concentrations
Collected from March 2015 to November 2015
Standard laboratory values reported
Orenco
Advantex
AX20®
BioMicrobics
FAST®SeptiTech
D®
17 Systems 4 Systems14 Systems
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Advantex FAST SeptiTech
System Type
0.5 1.0 1.5 2.0 2.5 3.0 3.5
mg
N/L
0
20
40
60
80
100
120
Advantex FAST SeptiTech
90th Percentile
10th Percentile
Median
Out of range
values
75th Percentile
25th Percentile
Distribution of TN Concentrations:
March- November 2015
TN
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Individual AX Systems
0 1 2 3 4 5 6 7 8 9 101112131415161718
TN
(m
g N
/L)
0
10
20
30
40
50
60
70
Individual Systems:
Distribution of TN Concentrations:
March- November 2015
71% of
systems
meet the
19 mg N/L
TN
standard.
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Individual FAST Systems
0 2 4 6 8 10 12 14
TN
(m
g N
/L)
0
20
40
60
80
100
120
Individual Systems:
Distribution of TN Concentrations:
March- November 2015
64% of
systems
meet the
19 mg N/L
TN
standard.
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Individual SeptiTech Systems
0 1 2 3 4
TN
(m
g N
/L)
0
10
20
30
40
50
Individual Systems:
Distribution of TN Concentrations:
March- November 2015
75% of
systems
meet the
19 mg N/L
TN
standard.
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Median TN Concentration:
Narragansett vs. Barnstable County Systems
System Type
AX FAST SeptiTech
TN
(m
g N
/L)
0
5
10
15
20
25
Our Study
Barnstable County Includes
systems not
turned on for
denitrification
mode
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Percentage of Systems in Compliance:
Narragansett vs. Cape Cod
System Type
AX FAST SeptiTech
% S
yste
ms in C
om
plia
nce
0
20
40
60
80
100
Our Study
Barnstable County
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+Differences in Regulations
4 maintenance visits required per year
Effluent sampling required
19 mg N/L TN standard
Online management database Tracks maintenance visits
Tracks effluent constituent levels
Alerts when effluent does not meet standards
2 maintenance visits
required per year
Do not include effluent
sampling
19 mg N/L TN standard
Barnstable County,
MassachusettsRhode Island
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Overview
1. Project overview
2. Evaluation of rapid field tests
3. Performance of Advanced N removal
OWTS in the Narragansett Bay
Watershed
4. Predictors of effluent total nitrogen
5. Conclusions
Monitor system
performance and
operational
parameters
Develop statistical
model for
performance
optimization
Adjust systems
accordingly
Measure changes in
response to
adjustments
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Which Parameters Best Predict Effluent Total
Nitrogen Concentration?
Ammonium
Nitrate
Alkalinity
pH
DO
Sample Temperature
Average Forward Flow
Recirculation Ratio
COD
BOD
Total Nitrogen
How well do these
parameters
correlate with TN?
Which parameters
can serve as
indicators for
effluent TN?
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Significant Predictors of
Total Nitrogen
Orenco
Advantex
AX20®
BioMicrobics
FAST®
SeptiTech
D®
System Type
Ammonium
Ammonium Nitrate BOD
pH
Nitrate
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Best Predictors of Total Nitrogen
Total Nitrogen Ammonium Nitrate BOD
pH
Nitrification &
DenitrificationOptimal
pH= 6-8
Total Nitrogen
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In conclusion…
• Accurate rapid field tests are available.
• Differences in regulatory requirements for
monitoring influences management and may
affect performance.
• Ammonium, nitrate, BOD, and pH are
significant predictors of TN.
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Where are we now?
• Continuing to collect and analyze final
effluent wastewater samples
• Evaluating underperforming systems and
working with service providers to make
adjustments to improve N removal
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We are hopeful!
Monitored Massachusetts systems are performing better, but RI systems can perform to standard.