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Sewerage & Water Board of New Orleans
Bayou Bienvenue Central Wetlands Assimilation Project Update
July 31, 2014
http://swbno.org
Wetlands Assimilation Phase I May 14, 2010: Coastal Protection and
Restoration Authority (CPRA) and SWBNO entered into an IGA to investigate the feasibility of restoring wetlands through introduction of nutrients via treated wastewater effluent
Sewerage & Water Board of New Orleans
http://swbno.org
State of Waters in the Wetlands
Salinity Level – Variable: 2 to 10 ppt – High in Fall, Low in Spring – Cypress growth at 1 to 3 ppt
Tidal Changes – 6 inches per day – Wind increases up to 1 ft
Sewerage & Water Board of New Orleans
1952
1976
http://swbno.org
State of Waters in the Wetlands
PH levels: 6.5 to 9 Dissolved Oxygen (4.0 ppm)
– Near or above saturation Nutrients
– Constant state of flux – Total Nitrogen: 0.17 to 3.31 ppm – Total Phosphorus: 0.04 to 0.43
ppm Nutria Overgrazing
Sewerage & Water Board of New Orleans
http://swbno.org
Wetlands Assimilation Phase II May 11, 2011: CPRA and SWBNO entered into
agreement to design and construct wetlands demonstration projects.
Sewerage & Water Board of New Orleans
http://swbno.org
Ferrate High Redox Potential No carcinogenic disinfection
byproducts Final product (Ferric hydroxide)
is non-toxic Shown to treat antibiotics,
hormones, and personal care products
Disinfects and stabilizes biosolids
Sewerage & Water Board of New Orleans
http://swbno.org
Wetlands Assimilation Phase II Process flow
– Ferrate treated effluent from Clarifier #1 is pump to cells
Goal is to evaluate the effectiveness of – Ferrate in binding the endocrine disrupting
chemical discharged in the final effluent, and – Biosolids (Class A biosolids and ash) in
enhancing the growth of the baldcypress and tupelo trees in the assimilation of wetlands
Sewerage & Water Board of New Orleans
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Wetlands Assimilation Phase II A-1 at $2,750,000 consists of
– construction of two cells – 24 acres total – both cells receiving ferrate disinfected effluent – one cell receiving Class A biosolids.
Sewerage & Water Board of New Orleans
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Wetlands Assimilation Demo Phase II Central Wetlands Unit – A-1
Sewerage & Water Board of New Orleans
Waldemar S. Nelson – Design including permitting and
biosolids analysis ($538,000) Contract 3780 – Advanced
Quality Construction – Construction of the cells
are 100% complete – $1.3 M Coastal Impact
Assistance Program
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Wetlands Assimilation Demo Phase II Central Wetlands Unit – A-1
Sewerage & Water Board of New Orleans
Contract 3781 ($288,000 CIAP) - Commander Corporation was issued May 2012 for civil/mechanical work associated with treated effluent and biosolids delivery – Bonding Agent is assuming completion of pipeline
Contract 3782 ($585,000 CIAP) – Lease-Purchase acquisition of ferrate treatment technology issued May 2012 and is on site
Biosolids permit to LDEQ submitted
http://swbno.org
Wetlands Assimilation Demo Phase II Central Wetlands Unit – A-1
Sewerage & Water Board of New Orleans
Current Status – Completion of pipeline installation – Veolia to place biosolids and ash – Pumping ferrate treated effluent into two cells – Reduced salinity levels will allow for planting of
baldcypress and tupelo – One year monitoring and analysis
http://swbno.org
Wetlands Assimilation Demo Phase II Central Wetlands Unit – A-2
Sewerage & Water Board of New Orleans
http://swbno.org
Wetlands Assimilation Demo Phase II Central Wetlands Unit – A-2
Sewerage & Water Board of New Orleans
3. Servitude from Republic Services
1. WSN submitted 95% design plans June 2014
2. Effluent pumped from EBWWTP to St. Bernard Parish
4. SWBNO to Bid summer 2014
5. Separate contract for plantings
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Wetlands Assimilation Demo Phase II Central Wetlands Unit – A-2
Sewerage & Water Board of New Orleans
Planting Floating Islands
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Wetlands Assimilation Demo Phase II Central Wetlands Unit – A-2
Sewerage & Water Board of New Orleans
Planting baldcypress, tupelo and bulrush
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Wetlands Expansion Project
Sewerage & Water Board of New Orleans
CPRA funded $4.5 M expansion
Design in-house
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Wetlands Expansion Project
Sewerage & Water Board of New Orleans
17 acre cell Cypress Planting Floating Islands Ferrate Treated
Effluent Ash Placement Construction to begin Dec. 2014
Sewerage & Water Board of New Orleans
Re-Building the City’s Water Systems for the 21st Century