Lombardo Associates, Inc.

Representative Nitrogen Removal
Project Descriptions
Multi Family & Institutional Applications

 Suffolk County Environmental
Center, Islip, Long Island, NY Croatan High School, Newport, NC

Scully Estate –Environmental Center
Suffolk County, Islip, NY
ON-SITE WASTEWATER TREATMENT SYSTEM
Project Application Data: Location:
Scully Estate –Suffolk County Environmental Center Site Application:
Islip, NY Installation Date:
November 2008
 Start-up:
Summer 2011
Wastewater Lombardo Associates, Inc.
Engineer:
Boston, MA & Malibu, CA
www.LombardoAssociates.com
Design Profile:Design Wastewater Flow = 1,300 gpd
Wastewater Treatment Process:
Septic Tank → BioFilter → NitrexTM →Drainfield

Project Description:
The Scully Estate is located on South Bay
Avenue in Bay Shore, Islip, NY,
approximately 6,500 feet south ofMontauk Highway. Daily design flow is1,300 gpd.
Because of the small flow
and the distance and expense involved inconnecting to the municipal sewer, an onsite treatment and disposal system wasselected by Suffolk County.
Nitrogen removal was the criticalwastewater issue due to the groundwatersolesource
aquiferandcoastal
embayment environmental sensitivity tonitrogen. For this reason, the NitrexTM
system was sole source selected bySuffolk County.
The entire project is LEED compliant. The
basic treatment process is nitrification
followed by the NitrexTM denitrification
reactor, then to the drainfield. Due to thelow alkalinity water supply and highnitrogen strength wastewater, an alkalinity
feed system is part of the system whichenables full nitrification to occur.

Nitrex TM
Effluent Nitrex TM
Total
TN %
Nitrogen (TN) TN (mg/l) Removal(mg/l)
Wastewater
Influent

Date10/04/1170.4

1.6

97.8%

03/21/12

81.3

5.1

94.6%

04/03/12

81.0

5.2

93.6%

04/10/12

81.0

4.8

94.1%

04/12/12

90.0

3.8

95.8%

04/17/12

81.0

3.4

95.8%

5.2
4.9
4.0

93.6%
94.3%
94.9%

04/24/12
81.0
08/21/12
85.2
Geometric Mean

Bogue Sound Elementary.
School & Croatan High School
Newport, NC.

.

ACHIEVING TOTAL NITROGEN < 3 MG/L
Project
Location:

Bogue Sound Elementary
School & Croatan High School
Newport, NC

Owner:

Carteret County Board of Education

Wastewater
Engineer:Lombardo Associates, Inc.
Boston, MA & Malibu, CA
www.LombardoAssociates.com

TMNitrex Design Profile: Design Wastewater Flow:
12,000 gpd
TM Nitrex Influent Total Nitrogen (TN): 70 mg/l
 Effluent Requirements:
o TN<10 mg/lo cBOD5<15 mg/lo TSS<15 mg/lo Fecal Coliform < 200 MPN/100ML
Wastewater Treatment Process:TM
Septic Tank  Recirculating Sand Filter  Nitrex Filter  Recirc. Sand Filter  UV Disinfection  Drainfield
Lombardo Associates, Inc. (LAI) was retained by the Carteret County Board of Education (CCBoE) to design, permit
TMand build a Nitrex Nitrogen Removal wastewater system serving Croatan High School and Bogue Sound Elementary
School. The existing wastewater system for the School consisted of three recirculating sand filter (RSF) cells with UV
disinfection prior to discharge to a drainfield. The LAI design included modifications to the piping of the RSF to optimizeTMdenitrification and construction of a Nitrex filter, and using one of the RSFs for polishing. The Croatan High School
and Bogue Sound Elementary School On-Site Wastewater Treatment System became operational in December 2009
and was immediately performing within permit requirements. Performance data is:Bogue Sound Elementary School & Croatan High School, Newport, NC
Start-up

Septic Tank Effluent

10-Dec-09

BOD

TKN

BOD

Units
Permit

mg/l

mg/l

mg/l
15

Geometric Mean
Average

178
192

104
109

1.2
1.4

Date

NitrexTM System Effluent
TNFecalTSS
Calc.
Coliform
mg/l
mg/l
mpn / 100 mL
15
10200

1.3
6.6

2.52
3.02

1.2
8.1