Rural onsite small community wastewater waste management
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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

Facultative & Anaerobic Lagoons


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Lagoon Systems Management

  • Objective

    • Create an ideal environment for microorganisms to consume waste organic matter

  • High strength waste - anaerobic lagoons

  • Wastewater - Facultative lagoons

    • AKA Stabilization ponds


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Anaerobic Lagoons Management

  • Natural continuation of the breakdown of food in the body

  • Digestion without oxygen


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Acid Formers Management

  • Tough

  • Can produce organic acids over a wide range of environmental conditions

  • Organic acids

    • Lower pH of lagoon

    • Smell bad !!!


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Methane Formers Management

  • Delicate

  • Easily upset by

    • Low pH - below 6.7

    • High salt concentration (8mmhos/cm)





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Startup Management

  • Start in Summer

  • About 1/2 full of clean water

  • Slowly add waste at first

    • Design loading after 1 year


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Loading Management

  • Continuous

  • Check pH

    • Add lime if below 6.7


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Pump out Management

  • Annually

  • Down to minimum treatment volume

  • Avoids salt buildup

    • If salts are over 8 mmhos/cm

    • Pump some out and add dilution water


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Anaerobic Lagoons Management

  • Natural treatment system

  • No power required

  • Tend to be large

    • Dilution

    • Long treatment time

  • Low, but daily management


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Stabilization Pond Management

  • Sometimes called facultative lagoon

  • Digestion with oxygen

  • Used to treat wastewater


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Stabilization pond Management

  • Shallow basin

  • Microorganisms at natural concentration


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Stabilization Pond Management


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Role of Algae Management


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Design Management

  • BOD loading

  • Hydraulic residence time

    • 3 to 12 months


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Loading Management

  • Can tolerate fluctuations in loading

  • Keep inlet below surface to control odors


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Management Management

  • Maintain banks

    • Keep weeds from growing in water

    • Keep burrowing animals out

    • Keep trees from growing


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Management Management

  • Maintain lnlet & Outlet Structures

    • Keep sludge from accumulating

    • Watch for signs of erosion

    • Exercise valves


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Discharge Management

  • Ideal for irrigation systems

    • Appropriate level of treatment

    • Storage to maximize flexibility for operator


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Sludge Management Management

  • Debris may wash up on banks

    • Pretreat with screens

  • Small amounts of stabilized sludge can be entrained in irrigation system


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Stabilization Ponds Management

  • Reduced management

    • No power requirement

    • Low labor time and training

    • Limited sludge management


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Stabilization Ponds Management

  • Large

    • Treatment takes a long time

    • Affected by winter conditions


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Relative Size Management

Fixed

Flim

1x

Lagoon

6x


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Reduce the Size? Management

  • Stirring

    • Improves air transfer

    • Increases contact between micoorganisms and waste


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Stirred Pond Management


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Impact of Stirring Management

  • Pond can be

    • Smaller

    • Deeper

    • Shorter residence time


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Impact of Stirring Management

  • Power required

  • More operator time & training

  • More sludge is generated


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Readings Management

  • Hammer & Hammer 413 - 419

  • MWPS 18 Section 7.1


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