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Nitrex(TM) Passive Nitrogen Removal Systems

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Information about Nitrex(TM) Passive Nitrogen Removal Systems
Education

Published on March 6, 2014

Author: savebuzzardsbay

Source: slideshare.net

Description

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
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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 1 March 5, 2014 1

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 2 2

Typical Residential Process Train 3 3

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 4

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LaPine OR US EPA Study Results 6 6

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 7 1.86 Average 1.35 1.055 1.015 1.43 2.99 1.57 7

Cluster / Neighborhood Wastewater Systems 8 8

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 9

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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 11

Malibu Creek Plaza, Malibu, CA Malibu Creek Plaza 12 12

Malibu Village Plaza Wastewater System Configuration Biofilters Nitrex T M Tanks 1 st Stage Recirculation Tank 13 2 nd Stage Recirculation Tank Discharge Tank EQ Tank 13

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 14 14

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 15

Individual Onsite Wastewater Systems 16 16

2 Family Residential Nitrex™Wastewater System  Harvard, MA  660 gpd Septic Tank Drip Irrigation BioFilter 17 NitrexTM Filter 17

Residential Retrofit Installations – Maryland Producing TN 1.7 mg/l BioFilter Septic tank NitrexTM Filter 18 18

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 19

Groundwater Treatment Options      20 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 20

NitrexTM PRB for Groundwater Treatment Cross Section. NitrexTM PRB 21

Waquoit Bay PRB 22 22

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 23 K. Foreman MBL, Woods Hole, MA 02543

NITRATE AT WAQUOIT BAY DATA COLLECTED BY WOODS HOLE MARINE BIOLOGICAL LAB (MBL) Groundwater Flow 24 24

Questions / Discussion Pio Lombardo, P.E. 25 25

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