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Rural, Onsite & Small Community Wastewater & Waste Management. Facultative & Anaerobic Lagoons. Lagoon Systems. Objective Create an ideal environment for microorganisms to consume waste organic matter High strength waste - anaerobic lagoons Wastewater - Facultative lagoons

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rural onsite small community wastewater waste management

Rural, Onsite & Small Community Wastewater & Waste Management

Facultative & Anaerobic Lagoons

lagoon systems
Lagoon Systems
  • Objective
    • Create an ideal environment for microorganisms to consume waste organic matter
  • High strength waste - anaerobic lagoons
  • Wastewater - Facultative lagoons
    • AKA Stabilization ponds
anaerobic lagoons
Anaerobic Lagoons
  • Natural continuation of the breakdown of food in the body
  • Digestion without oxygen
acid formers
Acid Formers
  • Tough
  • Can produce organic acids over a wide range of environmental conditions
  • Organic acids
    • Lower pH of lagoon
    • Smell bad !!!
methane formers
Methane Formers
  • Delicate
  • Easily upset by
    • Low pH - below 6.7
    • High salt concentration (8mmhos/cm)
startup
Startup
  • Start in Summer
  • About 1/2 full of clean water
  • Slowly add waste at first
    • Design loading after 1 year
loading
Loading
  • Continuous
  • Check pH
    • Add lime if below 6.7
pump out
Pump out
  • Annually
  • Down to minimum treatment volume
  • Avoids salt buildup
    • If salts are over 8 mmhos/cm
    • Pump some out and add dilution water
anaerobic lagoons12
Anaerobic Lagoons
  • Natural treatment system
  • No power required
  • Tend to be large
    • Dilution
    • Long treatment time
  • Low, but daily management
stabilization pond
Stabilization Pond
  • Sometimes called facultative lagoon
  • Digestion with oxygen
  • Used to treat wastewater
stabilization pond14
Stabilization pond
  • Shallow basin
  • Microorganisms at natural concentration
design
Design
  • BOD loading
  • Hydraulic residence time
    • 3 to 12 months
loading18
Loading
  • Can tolerate fluctuations in loading
  • Keep inlet below surface to control odors
management
Management
  • Maintain banks
    • Keep weeds from growing in water
    • Keep burrowing animals out
    • Keep trees from growing
management20
Management
  • Maintain lnlet & Outlet Structures
    • Keep sludge from accumulating
    • Watch for signs of erosion
    • Exercise valves
discharge
Discharge
  • Ideal for irrigation systems
    • Appropriate level of treatment
    • Storage to maximize flexibility for operator
sludge management
Sludge Management
  • Debris may wash up on banks
    • Pretreat with screens
  • Small amounts of stabilized sludge can be entrained in irrigation system
stabilization ponds
Stabilization Ponds
  • Reduced management
    • No power requirement
    • Low labor time and training
    • Limited sludge management
stabilization ponds24
Stabilization Ponds
  • Large
    • Treatment takes a long time
    • Affected by winter conditions
relative size
Relative Size

Fixed

Flim

1x

Lagoon

6x

reduce the size
Reduce the Size?
  • Stirring
    • Improves air transfer
    • Increases contact between micoorganisms and waste
impact of stirring
Impact of Stirring
  • Pond can be
    • Smaller
    • Deeper
    • Shorter residence time
impact of stirring29
Impact of Stirring
  • Power required
  • More operator time & training
  • More sludge is generated
readings
Readings
  • Hammer & Hammer 413 - 419
  • MWPS 18 Section 7.1