1 / 30

Rural, Onsite & Small Community Wastewater & Waste Management

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

Renfred
Télécharger la présentation

Rural, Onsite & Small Community Wastewater & Waste Management

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Rural, Onsite & Small Community Wastewater & Waste Management Facultative & Anaerobic Lagoons

  2. 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

  3. Anaerobic Lagoons • Natural continuation of the breakdown of food in the body • Digestion without oxygen

  4. Acid Formers • Tough • Can produce organic acids over a wide range of environmental conditions • Organic acids • Lower pH of lagoon • Smell bad !!!

  5. Methane Formers • Delicate • Easily upset by • Low pH - below 6.7 • High salt concentration (8mmhos/cm)

  6. Anaerobic Digestion

  7. 1 Stage Anaerobic Lagoon

  8. 2 Stage Anaerobic Lagoon

  9. Startup • Start in Summer • About 1/2 full of clean water • Slowly add waste at first • Design loading after 1 year

  10. Loading • Continuous • Check pH • Add lime if below 6.7

  11. 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

  12. Anaerobic Lagoons • Natural treatment system • No power required • Tend to be large • Dilution • Long treatment time • Low, but daily management

  13. Stabilization Pond • Sometimes called facultative lagoon • Digestion with oxygen • Used to treat wastewater

  14. Stabilization pond • Shallow basin • Microorganisms at natural concentration

  15. Stabilization Pond

  16. Role of Algae

  17. Design • BOD loading • Hydraulic residence time • 3 to 12 months

  18. Loading • Can tolerate fluctuations in loading • Keep inlet below surface to control odors

  19. Management • Maintain banks • Keep weeds from growing in water • Keep burrowing animals out • Keep trees from growing

  20. Management • Maintain lnlet & Outlet Structures • Keep sludge from accumulating • Watch for signs of erosion • Exercise valves

  21. Discharge • Ideal for irrigation systems • Appropriate level of treatment • Storage to maximize flexibility for operator

  22. Sludge Management • Debris may wash up on banks • Pretreat with screens • Small amounts of stabilized sludge can be entrained in irrigation system

  23. Stabilization Ponds • Reduced management • No power requirement • Low labor time and training • Limited sludge management

  24. Stabilization Ponds • Large • Treatment takes a long time • Affected by winter conditions

  25. Relative Size Fixed Flim 1x Lagoon 6x

  26. Reduce the Size? • Stirring • Improves air transfer • Increases contact between micoorganisms and waste

  27. Stirred Pond

  28. Impact of Stirring • Pond can be • Smaller • Deeper • Shorter residence time

  29. Impact of Stirring • Power required • More operator time & training • More sludge is generated

  30. Readings • Hammer & Hammer 413 - 419 • MWPS 18 Section 7.1

More Related