11

Pio Lombardo, P.E.Lombardo Associates, Inc.Newton, MA 02458Pio@LombardoAssociates.comwww.LombardoAssociates.com

Nitrex TM Passive Nitrogen Removal Systems Achieving Total Nitrogen 3 mg/l

Workshop on Nitrogen Removing Wastewater Systems

Buzzards Bay Coalition

Buzzards Bay Center, 114 Front Street New Bedford, MA

March 5, 2014March 5, 2014

22

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

NitrexTM

3

Typical Residential Process Train

3

44

Malibu, CA Plaza Wastewater Process Flow Has Achieved TN < 2 mg/l for 3+ years

Grease Trap

Septic Tank

Recirculation Tank

NitrexTM 1st Stage Filter

NitrexTM Nitrogen Reduction Filter – 2nd stage

Polishing

Filter

Dispersal to Drainfields

Kitchen Sewer

Building Sewer

Produces Effluent Compliant with CA Title 22 Requirements for Unrestricted Water Reuse

55

66

LaPine OR US EPA Study Results

7

Suffolk County Alternative Wastewater Technologies NitrexTM Testing by SCDHS

7

No. Site Name1st

sampling2nd

sampling Average1 Eastham MA 40 unit subdivision 1.33 1.37 1.352 Mashpee MA 24 unit subdivision with 5,200 sf commercial 0.54 1.57 1.0553 Harvard MA 2 family installation 0.63 1.4 1.0154 Malibu CA 16,000 gpd Shopping Center restaurants & retail 1.58 1.28 1.435 St. Leonard, MD single family installation 2.3 3.68 2.99

Average all sites 1.28 1.86 1.57

NitrexTM EFFLUENT TN (mg/l) Sampled by H2M

88

Cluster / NeighborhoodWastewater Systems

9

Residential & Light Commercial Nitrex™Wastewater System – Mashpee, MA

Effluent Total Nitrogen 3 +/- mg/lQuarterly Operator Visits

BIOFILTER

DRAINFIELD PUMP

STATION

SEPTIC TANK

NITREX™ FILTER

Mashpee, MA Wastewater System at Substantial Completion

BioFilter

NitrexTM Filter

Drainfield Pump Station

Mashpee, MA Wastewater System at Completion

1010

11

Residential Development Producing Water with Total Nitrogen 2.2 mg/l

Eastham, MA 10,000 gpd design flow

Biofilter

NitrexTM Tanks

Drainfield

Drainfield

Septic Tank

NitrexTM Tank

Bio-filter

1212

Malibu Creek Plaza, Malibu, CA

Malibu Creek Plaza

1313

Malibu Village Plaza Wastewater System Configuration

Biofilters

1st StageRecirculation

Tank2nd Stage

Recirculation Tank

Discharge Tank

NitrexTM Tanks

EQ Tank

1414

Malibu Village Plaza Performance

Removes Emerging Contaminants

Operator Requirements – 4 hours per week

Continuous electronic monitoring accessible via

telephone/web

2008 4.90 3.04 3.31 1.44 2009 1.72 3.29 3.23 0.57 2010 1.90 2.23 2.82 3.02 2.71 2.98 0.38 0.54 2011 2.04 1.89 2.74 2.91 2.56 2.81 0.36 0.42

Annual Geo mean

3 yr Geo

Mean

TSS (mg/l) Turbidity (NTU)

3 yr Geo

Mean

Annual Geo

mean

Annual Geo mean

3 yr Geo Mean

3 yr Geo

Mean

Total Nitrogen (mg/l)

Annual Geo mean

BOD (mg/l)

Achieves Unlimited Reuse Standards

1515

Bogue Sound Elementary School & Croatan High School Newport, NC

Influent Quality:

TN 70 - 149 mg/l104 mg/l average

Average Effluent Quality:

TN 2.57 mg/lBOD5 < 2 mg/l TSS 8.1 mg/lFecal Coliform 8.8 MPN/100ML

• Sole source selected by NC Schools upon recommendation of North Carolina Dept. Natural Resources

1616

Individual Onsite Wastewater Systems

1717

2 Family Residential Nitrex™Wastewater System

Harvard, MA 660 gpd

BioFilter

Septic Tank

NitrexTM Filter

Drip Irrigation

1818

Residential Retrofit Installations – Maryland Producing TN 1.7 mg/l

BioFilter

Septic tank

NitrexTM Filter

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Nitrex™ Costs

•Total System costs for residential applications:

New/Complete System $28,000 - $35,000

Retrofit $20,000 - $25,000

•Large systems sized based upon:

•Total N to be removed – i.e. from 90 to 3 ppm of N

•Generally $50 - $75/gpd capacity for Turnkey Design-Build-Start-up

•Comparison with Conventional Systems

• Generally 10+/- % savings on capital costs

• 35+/- % savings on annual O&M costs

•Operational and Management simplicity

2020

Groundwater Treatment Options

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 NO3-N

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NitrexTM PRB for Groundwater Treatment

Cross Section. NitrexTM PRB

2222

Waquoit Bay PRB

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November 2005, ~ 3.5 months after installationGroundwater Nitrate Removal in Waquoit Bay PRB

W1W2

W3 W4 W5 W6W7 W8

Relative Distance (m)

Rel

ativ

eE

leva

tion

(m)

0 2 4 6 8 10-4

-2

0

2

NO3- (M)1501301109070503010

PRB

Grade

Waquoit Bay

K. Foreman MBL, Woods Hole, MA 02543

2424

NITRATE AT WAQUOIT BAY DATA COLLECTED BY WOODS

HOLE MARINE BIOLOGICAL LAB (MBL)

Groundwater Flow

2525

Questions / Discussion

Pio Lombardo, P.E.