A presentation about Nitrex(TM) Passive Nitrogen Removal Systems. Presented by Pio Lombardo with Lombardo Associates Inc. during a Buzzards Bay Coalition 2014 Decision Makers mini-workshop on nitrogen-reducing septic systems. Learn more at www.savebuzzardsbay.org/DecisionMakers

1. Nitrex
Passive Nitrogen Removal Systems
Achieving Total Nitrogen 3 mg/l
TM
Workshop on Nitrogen Removing Wastewater
Systems
Buzzards Bay Coalition
Buzzards Bay Center, 114 Front Street New Bedford, MA
Pio Lombardo, P.E.
Lombardo Associates, Inc.
Newton, MA 02458
Pio@LombardoAssociates.com
www.LombardoAssociates.com
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March 5, 2014
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2. Nitrex TM

Passive Lower Cost Alternative

Achieving TN < 5 mg/l, averaging
TN 3 mg/l

Can Produce TN < 2 mg/l &< 1
mg/l if desired / required
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3. Typical Residential Process Train
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4. Malibu, CA Plaza Wastewater Process Flow
Has Achieved TN < 2 mg/l for 3+ years
Produces Effluent Compliant with CA Title 22
Requirements for Unrestricted Water Reuse
Kitchen
Sewer
Grease
Trap
Building
Sewer
Septic
Tank
TM
Nitrex Nitrogen
Reduction Filter
– 2nd stage
4
Recirculation
Tank
Polishing
Filter
NitrexTM 1st
Stage Filter
Dispersal to
Drainfields
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5. 5
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6. LaPine OR US EPA Study Results
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7. Suffolk County Alternative Wastewater Technologies
NitrexTM Testing by SCDHS
Nitrex
No.
1
2
3
4
5
TM
EFFLUENT TN (mg/l) Sampled by H2M
1st
2nd
Site Name
sampling sampling
Eastham MA 40 unit subdivision
1.33
1.37
Mashpee MA 24 unit subdivision with 5,200 sf commercial
0.54
1.57
Harvard MA 2 family installation
0.63
1.4
Malibu CA 16,000 gpd Shopping Center restaurants & retail
1.58
1.28
St. Leonard, MD single family installation
2.3
3.68
Average all sites 1.28
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1.86
Average
1.35
1.055
1.015
1.43
2.99
1.57
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8. Cluster / Neighborhood
Wastewater Systems
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9. Residential & Light Commercial Nitrex™
Wastewater System – Mashpee, MA
Effluent Total Nitrogen 3 +/- mg/l
Quarterly Operator Visits
Drainfield Pump
Station
BIOFILTER
DRAINFIELD PUMP
STATION
BioFilter
NitrexTM Filter
SEPTIC TANK
NITREX™
FILTER
Mashpee, MA Wastewater System at Substantial Completion
Mashpee, MA Wastewater System at Completion
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10. 10
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11. Residential Development Producing Water with Total
Nitrogen 2.2 mg/l

Eastham, MA

10,000 gpd design flow
Septic Tank
TM
Nitrex
Tanks
Biofilt
er
Drainfiel
d
Bio-filter
NitrexTM Tank
Drainfield
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12. Malibu Creek Plaza, Malibu, CA
Malibu Creek
Plaza
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13. Malibu Village Plaza
Wastewater System Configuration
Biofilters
Nitrex T M Tanks
1 st Stage
Recirculation
Tank
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2 nd Stage
Recirculation
Tank
Discharge
Tank
EQ Tank
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14. Malibu Village Plaza Performance
Achieves Unlimited Reuse Standards
Total Nitrogen (mg/l)
Annual Geo
mean
4.90
1.72
1.90
2.04
2008
2009
2010
2011
3 yr Geo
Mean
2.23
1.89
BOD (mg/l)
Annual
Geo mean
3.04
3.29
2.82
2.74
3 yr
Geo
Mean
3.02
2.91
TSS (mg/l)
Annual
Geo mean
3.31
3.23
2.71
2.56
3 yr
Geo
Mean
2.98
2.81
Turbidity (NTU)
Annual
Geo
mean
1.44
0.57
0.38
0.36
3 yr
Geo
Mean
0.54
0.42

Removes Emerging Contaminants

Operator Requirements – 4 hours per week

Continuous electronic monitoring accessible via
telephone/web
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15. Bogue Sound Elementary School &
Croatan High School Newport, NC
Influent Quality:
TN
70 - 149 mg/l
104 mg/l average
Average Effluent Quality:
TN
2.57
BOD 5
< 2
TSS
8.1
Fecal Coliform 8.8
MPN/100ML
•
15
mg/l
mg/l
mg/l
Sole source selected by NC Schools upon recommendation of
North Carolina Dept. Natural Resources
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16. Individual Onsite
Wastewater Systems
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17. 2 Family Residential Nitrex™Wastewater System

Harvard, MA

660 gpd
Septic Tank
Drip Irrigation
BioFilter
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NitrexTM Filter
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18. Residential Retrofit Installations – Maryland
Producing TN 1.7 mg/l
BioFilter
Septic
tank
NitrexTM Filter
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19. Nitrex™ Costs
•Total
System costs for residential applications:
New/Complete System
Retrofit
•Large
$28,000 - $35,000
$20,000 - $25,000
systems sized based upon:
•Total
N to be removed – i.e. from 90 to 3 ppm of N
•Generally
•Comparison
$50 - $75/gpd capacity for Turnkey Design-Build-Start-up
with Conventional Systems
•
Generally 10+/- % savings on capital costs
•
35+/- % savings on annual O&M costs
•Operational
and Management simplicity
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20. Groundwater Treatment Options





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Immediate Water Quality Benefit
Addressing legacy issue of historical N
discharges
Natural flushing may take 5 - 30+ years after
improvements made
Estuarine Water Quality Standards
 typically 0.35 mg/l TN
Drinking water standard is 10 mg/l NO 3 -N
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21. NitrexTM PRB for Groundwater
Treatment
Cross Section. NitrexTM PRB
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22. Waquoit Bay PRB
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23. November 2005, ~ 3.5 months after installation
Groundwater Nitrate Removal in Waquoit Bay PRB
NO3 (? M)
-
Grade
Relative Elevation (m)
PRB
W1
2
150
130
110
90
70
50
30
10
W2
W3 W4
W5 W6
W7 W8
0
Waquoit
Bay
-2
-4
0
2
4
6
Relative Distance (m)
8
10
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K. Foreman MBL, Woods Hole, MA 02543

24. NITRATE AT WAQUOIT BAY DATA COLLECTED BY
WOODS
HOLE MARINE BIOLOGICAL LAB (MBL)
Groundwater Flow
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25. Questions / Discussion
Pio Lombardo, P.E.
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