Water Reuse & Wastewater Management
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Transcript of Water Reuse & Wastewater Management
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Water Reuse & Wastewater Management
Pio Lombardo, P.E.
Lombardo Associates, Inc.
Newton, MA [email protected]
www.LombardoAssociates.com
September 25, 2008
Sustainable Best Practices
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Credentials & Experience
•Over 35 years’ experience in wastewater management, planning and implementation
•Engineer of Record for over $200 million of wastewater management projects throughout the US
•Authored numerous USEPA manuals on decentralized wastewater management
•Limnology & water quality expertise
•Corporative Execute for international environmental engineering firms
•Design/Build/Operate Experience
•Recipient of ENR Construction Man-of-the-Year Candidate Award
•LAI received the ACEC Engineer of Excellence Award
•Registered Engineers in 29 States
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Project Types
Commercial Development
Residential Development
Institutional
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EMERGENT WETLAND
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Water Use Efficiency & Water Reuse
• Minimize Potable Water Demand
• Roof Runoff + Stormwater Reuse
• Wastewater Reuse
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Commercial Development Projects
Shopping Centers
Office / Retail
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No Net Discharge System
•No Net Discharge
•Minimizes Potable Water Demand(50-70% Reduction)
Wastewater
Collection
Wastewater
Treatment
Rain Collection
StormwaterTreatment Storage
In-Building
Reuse
Landscape
Irrigation
Rain Collection
Stormwater
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Malibu- La Paz Development
Water Reuse – No Discharge System
The No Wastewater Discharge is achieved by:
In-Building Reuse – Toilet Flushing
Landscape Irrigation – Roof Runoff & Stormwater Reuse
Malibu La Paz – City Hall Village Green
11 Commercial
Buildings
2 Restaurants
(175 seats/each)
Proposed New
City Hall
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Malibu- La Paz Development
Design Flow: 28,000 gpd / 23,000 gpd
Malibu La Paz – Entry
With the Water Reuse, Potable Water Demand
will be 14,200 gpd… a 56% Reduction
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Malibu Creek Plaza, Malibu, CA
16,000 gpd Shopping Center
Malibu Creek
Plaza
• Equivalent to ~200 Residential Units
• Achieving Title 22 Unrestricted Water Reuse Requirements
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Malibu Creek Plaza, Malibu, CA
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Malibu- Ioki Development
Water Reuse – No Discharge System
Environmentally Sensitive Area, adjacent to the famous Surfrider Beach in Malibu, CA
Combination of Office & Retail buildings
Integrated Wastewater-Stormwater Irrigation System
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Malibu- Ioki Development
Design Flow: 20,800 gpd / 18,200 gpd
Without Water Reuse:
In-Building Water Demand = 12,970 gpd
Irrigation = 10,700 gpd= 23,670 gpd
With Water Reuse:
Potable Water Demand = 10,185 gpd
57% REDUCTION
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Urban – Mixed Use Development
Wastewater Treatment Plant
Reuse Plan
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Commercial Development Projects
Wastewater Reuse for Toilet Flushing
Greenhouse - Wetlands
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Dense Urban Development Wastewater Treatment Plant Reuse Plan
Westwood Station On-Site Wastewater System
Preliminary Economic Analsys
prepared by Lombardo Associates, Inc. - November 9, 2006
Design Flow 50,000 gpd
18,250,000 gallons per year (gpy)
18,250 1,000 gpy
Annual Cost with Sewer Connection
2005 Westwood Water Use Rate 3.97$ per hundred cubic feet (HCF)
2005 Westwood Sewer Use Rate 13.95$ per hundred cubic feet
17.92$ per HCF
23.96$ per 1,000 gallons
50,000 gpd
18,250 1,000 gpy
Annual Water Use Cost 96,862$
Annual Sewer Use Cost 340,358$
Annual Total Water & Sewer Cost 437,219$
1. Annual Water & Sewer Use Avoidance Costs
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Dense Urban Development Wastewater Treatment Plant Reuse Plan
On-Site Wastewater Reuse System
Range of Estimated Annual O&M Costs
Achievable Low End Safe High End
1. Annual O&M Costs - Est. Budget Range 100,000$ 150,000$
2. Estimated Net Annual Savings 337,219$ 287,219$
3. Simple Payback Period 10 years
3,372,193$ 2,872,193$
Notes:
1. Amenity value of greenhouse not considered
2. Impact of continuing rising MWRA rates - 9.8% for 2006 - not considered
3. Value of LEED points not considered
5. Can reuse system be implemented for less than
Allowable Capital Cost ?
4. "Maximum Allowable" Capital Cost of Reuse
System
Initial Capital Cost estimate = $3,025,000
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Residential Development Projects
Nitrogen Sensitive Coastal Areas
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Mashpee, MA – 5,226 gpd
Residential &Commercial Site
BIOFILTER
DRAINFIELD PUMP
STATION
SEPTIC TANK
NITREX™ FILTER
BioFilter
Niitrex Filter
Drainfield Pump Station
NitrexTM Filter
•TN < 3 mg/l
•Monthly O&M Visits
•Electricity Use - $0.75 / day
•No chemical Addition
•Normal Septage Removal
•24 Units Mixed Housing (40B)
•9,800 SF Commercial
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Eastham, MA – Brackett Landing
Cape Cod Residential Development Producing Water with Total Nitrogen < 3.0 mg/l
Design Flow:
10,000 gpd
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Chincoteague, VA
3,900 gpd Commercial System
RECIRCULATING PEAT FILTER AEROBIC
TREATMENT SYSTEM
RESIDENTIAL SYSTEM
TOTAL NITROGEN < 3 mg/l
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Septic Tank
Recirculating Media Filter
Recirculating Tank
NitrexTM Filter
Merced, CA
330 gpd Institutional System
Gurr Road
Fire Station
Nitrogen Removal System as an addition to the Septic System
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Campus Water Use and Wastewater Generation
Analysis
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Annual Residential Water & Sewer Charges for
Major US Cities
Typical Water Charge = $3.08 / 1,000 gallons
Typical Sewer Charge = $4.63 / 1,000 gallons
Typical Combined Charge = $7.71 / 1,000 gallons
Boston Water Charge = $4.40 / 1,000 gallons
Boston Sewer Charge = $5.39 / 1,000 gallons
Boston Combined Charge = $9.79 / 1,000 gallons
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Annual Residential Water & Sewer Charges for
Major US Cities ($/1,000 gallons)
Water Sewer CombinedBoston, MA $4.40 $5.39 $9.79Columbus, OH $2.62 $3.58 $6.20Dallas, TX $2.31 $3.65 $5.97Indianapolis, IN $2.74 $2.13 $4.87Jacksonville, FL $2.24 $4.74 $6.98Los Angeles, CA $2.91 $3.35 $6.26MWRA Service Area $4.46 $6.72 $11.18New York, NY $2.41 $3.84 $6.25Philadelphia, PA $3.43 $4.41 $7.84Portland, ME $3.05 $8.48 $11.53Providence, RI $3.44 $3.79 $7.23Saint Paul, MN $2.27 $3.55 $5.82San Diego, CA $4.60 $5.36 $9.96San Francisco, CA $3.33 $7.45 $10.79Seattle, WA $4.63 $9.01 $13.64Washington, DC $3.21 $4.51 $7.72
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Analysis Process
•Analysis of Water Use by Meter – Daily, Seasonal and Annual
•Use Profile
•Wastewater Generation Analysis
•Identify Water Use / Wastewater Opportunities
•Economic Analysis of Water / Sewer
•Quantify Potential Savings
•Conceptual Design & Capital and O&M Cost of Projects to Achieve Potential Savings
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Use Profile
•Wastewater Generation Analysis
•Toilet Flushing/Showers/Food Related
•Laundry
•Laboratory
•Cooling Towers and Power Plant Blowdowns
•Academic Laboratory Equipment
•Other
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Cost Analysis
•Financial Situation – Existing
•Using Existing and Projected Water & Sewer Rate
•Annual Water Cost
•Annual Sewer Cost
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Opportunities Identification
•Identify Water Use / Wastewater Opportunities
•Conservation
•Reuse
•Toilets
•Cooling Towers
•Irrigation
•Independent Laundry Reuse Systems
•Others
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Evaluation
•Conceptual Design and Capital and O&M Costs of Projects to Achieve Potential Savings
•Simple Financial Analysis
•Payback Plan
•Return on Investment
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Non – Domestic Water Conservation Opportunities – Project 1
•Collect
•CUP Cooling Tower and Boiler Blowdown
•RO Rejects
•Vacuum Pump Cooling Water
•Roof Rainwater
•Humidifier Condensates
•Treat water at Facility
•Reuse Treated Effluent for Cooling Tower Make-Up
•With payback of ten (10) years, simple 10% ROI $3.4 million could be spent
Water Quantity Savings Potential 108,000 gpd
Water/Sewer Dollar Savings Potential $339,000/yr
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Non – Domestic Water Conservation Opportunities – Project 2
•Evaluate Underground Use of a Location for Stormwater/Wastewater Storage/Treatment Facility
•Treat Stormwater/Wastewater for non-potable water use
•With payback of ten (10) years, simple 10% ROI $5.6 million could be spent
Water Quantity Savings Potential 179,000 gpd
Water/Sewer Dollar Savings Potential $560,000/yr
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Dispersal Systems
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Dispersal - Drip Irrigation
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Drip Field
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LEACHFIELD PRSSSURE
DISTRIBUTION TEST
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LEACHFIELD (BURIED)
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Disinfection + Emerging
Contaminants Removal
•UV
•Ozone
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Malibu Creek Plaza, Malibu, CA
Ozone – UV Disinfection
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Questions / Answers