Northport Village Investigation of Alternatives

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Northport Village Investigation of Alternatives

• 411 Design Team Members
• Christine Gagnon
• Jason Campbell
• Daniel Flaig
• Joel Evans
• Charles Thompson

   

• CIE 411 Consultants

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Scope of Study

• Investigate wastewater treatment alternatives
• Meet effluent quality requirements
• Minimize Land Use
• Cost Estimates
• Construction
• Operation and Maintenance (OM)

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Investigation of Alternatives

• Lagoons
• Facultative
• Aerated
• Golf Course Irrigation
• Forest Spraying
• Package Plant
• Compost Toilets
• Greywater

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Lagoon Alternative

• Background Information
• Lagoons are well suited for small and rural
  communities because they cost less to construct
  and to operate and maintain than other wastewater
  treatment systems
• They also work very well for seasonal
  communities, such as Northport Village, because
  they are able to handle periods of light and
  heavy use

 
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Background Information Continued

• What are Lagoons?
• Lagoons are constructed basins, in or out of the
  ground that use dikes to retain the wastewater

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Background Information Continued

• There are several types of lagoons.
• Anaerobic, Aerobic, Aerated and Facultative
  lagoons
• There are many factors that must be considered in
  designing a lagoon
• Such as
• Type of soil, the amount of land available,
  climate, amount of sunlight and wind
• Also, the amount of wastewater to be treated and
  the level of treatment required by state
  regulations, such as additional treatment for
  wastewater that is discharged into the ocean or
  into a land application

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Advantages of Lagoons

• They are cost-effective to design and construct
• Lagoons require less energy than most other
  wastewater treatment systems
• They are simple to operate and maintain
• Lagoons can handle periods of heavy and light
  usage better than most systems, which makes them
  a good option for seasonal communities
• The effluent from lagoons can be used for
  irrigation, because of its high-nutrient and its
  low pathogen content

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Disadvantages of Lagoons

• They require more land area than other wastewater
  treatment systems
• Odor can be a serious problem during algae
  blooms, spring thaw, or with anaerobic lagoons
  and with lagoons that are improperly maintained
• If lagoons are not well maintained, they can
  become a breading ground for mosquitoes and other
  insects
• Lagoons are not very effective in removing heavy
  metals from the wastewater
• Most lagoons often require additional treatment
  or disinfection to meet state and local discharge
  standards

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Northport Village Lagoon Alternative

• Facultative Aerated lagoons where chosen as
  design alternatives for the Northport Village
  community
• Why??
• Because these types of systems have the lowest
  OM costs than other types of lagoons
• Also, there is minimal amount of ODOR associated
  with these type of lagoons

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Facultative Lagoon Alternative

• How They Work
• Wastewater inside the lagoon naturally settles
  into three distinct layers or zone
• Aerobic zone
• Intermediate zone
• Anaerobic zone

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Facultative Lagoon Alternative

• How Treatment Occurs
• Wastewater treatment occurs naturally using
  physical, biological and chemical processes
• Such as
• Wind
• Sunlight
• Algae
• Bacteria

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Aerated Lagoon Alternative

• How They Work How Treatment Occurs
• Aerated lagoons are essentially facultative
  lagoons where oxygen is added by an aeration
  system
• Diffused and mechanical aeration systems are the
  two major aerators used in these types of lagoons
• Aerated lagoons require less land area than other
  types of lagoons

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Lagoon Design Parameters

• Completely Mixed Flow Through Model
• Average Daily Flow 60,000 GPD
• Influent BOD5 280 mg/L
• Effluent BOD5 30 mg/L
• Effluent TSS 30 mg/L
• Population 1,000 Summer 330 Winter

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Facultative Lagoon Design Guidelines

• BOD5 Loading Rate 15 - 35 lb/acre-day
• Detention Time 120 days minimum
• Water Depth 3 - 5 ft.
• Treatment Lagoons 2
• Storage Lagoon 6 MG (Winter Storage)
• Freeboard 2 ft. minimum

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Facultative Lagoon Design

• Treatment Lagoon Volume 9.69 Mgal.
• Surface Area 7 acres
• Maximum Detention Time 161.5 days
• Inside Slopes 31
• BOD5 Loading 20 lb/acre-day (winter)
• BOD5 Loading 30 lb/acre-day (summer)
• Land Area Required 17 - 20 acres

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Aerated Lagoon Design Guidelines

• BOD5 Loading Rate 50 - 100 lb/acre-day
• Detention Time 30 - 60 days
• Water Depth 10 - 15 ft.
• Treatment Lagoons 2
• Storage Lagoon 6 MG (Winter Storage)
• Freeboard 2 ft. minimum
• Aeration System Diffused Fine Bubble

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Aerated Lagoon Design

• Treatment Lagoon Volume 4.95 Mgal.
• Treatment Depth 15 ft.
• Surface Area 2.42 acres
• Maximum Detention Time 56 days
• Inside Slopes 31
• Storage Lagoon 7.7 Mgal., 2.12 acres
• Land Area Required 10 - 13 acres

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Facultative Lagoon Cost Estimates

• Potential User Fee
• 804/user/year

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Aerated Lagoon Cost Estimates

• Potential User Fee
• 623/user/year interest

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Package Plant Alternative

• Package Plant Description
• Pre-engineered and Fabricated, then delivered to
  the site
• Basically a small-scale treatment plant Using
  Rotating Biological Contactor technology or
  Activated Sludge technology

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Package Plant Description Continued

• Typical unit size is about 8 x 10 x 36
• Several of these units are connected in parallel
  to serve the total design flows
• Maintenance
• Desludging (by vacuum truck) every 3-4 months,
  depending on waste and flow loads
• Grease bearing during Desludging
• Visual inspection once a week to verify correct
  operation
• Change crankcase oil (and UV light bulbs) once
  per year

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Package Plant Advantages

• Compact size approximately 150 x 150
• Simple installation pre-fabricated units
• Possibly eliminate need for pump station
• Competitive pricing compared to other wastewater
  treatment systems
• Potential use of UV disinfection technology

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Package Plant Disadvantages

• Possible geo-technical issues if located next to
  the ocean
• Continued discharge into the bay (though
  perfectly safe and clean)
• Some odor during de-sludging (every 3-4 months)

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Package Plant Approximate Costs
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Package Plant User Fees

• Pollution Control System
• 387/user/year
• BMS Blivet
• 442/user/year

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Composting Toilet Alternative

• Composting Toilet Description
• Introduced more than a 1000 years ago
• More recently, 1930 Swedish engineer Rickard
  Lindstrom
• Passage of Clean Water Act
• Composting toilet boom in U.S.
• Thousands installed between 1970s and 1980s

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Composting Toilet Description Continued

• Made from many materials
• Concrete
• Fiberglass
• Wood
• More than 50 systems Manufactured or site built
• Bio-solids decompose with help from added carbon
  sources
• Cup of sugar
• Wood chips
• Stale popcorn
• Peat moss not highly recommended

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Compost Toilet Advantages

• Composting toilet systems reduce domestic water
  consumption because they do not require water for
  flushing
• Composting toilet systems can accept kitchen
  wastes, thus reducing household garbage
• Self-contained systems eliminate the need for
  transportation of wastes for treatment and
  disposal

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Compost Toilet Disadvantages

• Maintenance of composting toilet systems requires
  more responsibility and commitment by users and
  owners than conventional wastewater systems
• Most composting toilet systems require a power
  source
• Improperly installed or maintained systems can
  produce odors and unprocessed material

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Compost Toilet Approximate Costs

• Capital costs
• Dependent on capacities and technology
• Very High tech and ease of use
• Composter 5000
• Wastewater tank 2500
• Foam flush toilet 1500 per toilet
• Micro-flush toilet 200 per toilet
• Vacuum flush toilet 1400 per toilet
• Total Range 7700 - 8900 complete

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Compost Toilet Approximate Costs Continued

• Self Contained cottage style 2 6 person
  usage-small models
• Several options for capacity
• Weekend usage to year round usage
• Electric/non-electric
• 900 - 1600 per unit

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Greywater System Description

• Ease of disposal
• Use current infrastructure
• Infrastructure upgrades not needed
• Flush infrastructure prior to greywater use
  (optional?)

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Greywater Advantages

• Reduction of fresh water use
• Less energy and chemical use
• Less strain on septic tank or treatment plant
  systems
• Improved awareness and sensitivity of natural
  cycles

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Greywater Disadvantages

• Legality Concerns
• Health Concerns

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Greywater Approximate Costs

• Improvements to current septic system
• Replace current septic tanks
• 50,000
• Flush Current Infrastructure
• 150.00/hr 1000 ft per day depending on build-up
• Total 25,000

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Compost Toilet Greywater User Fees

• Based on most costly system
• 10,000 System
• Bells Whistles of Compost Toilets
• No Contract Maintenance
• 198/user/year

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Golf Course Irrigation With Treated Effluent?

• Northport Golf Club
• 75 acres
• May - October
• 0.17 in/week for irrigation
• 8 Mgal./year
• Bayside Generates 26.5 Mgal./year

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Forest Spraying With Treated Effluent?

• 26.5 Mgal./year
• Spray Season 24 - 26 weeks
• Hydraulic Loading 1.5 in/acre-week
• Time of Operation 12 hrs/day 5 days/wk
• Pumping Capacity 300 - 500 gpm
• Suitable Land Area 30 - 45 acres
• High Capital Costs

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Thank you

• QUESTIONS?

• CIE 411 Consultants