Purdue University's Extension program provides [http://www.extension.purdue.edu/pork/clipart/bw.htm diagrams of anaerobic lagoons].
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[[File:Sewlag3.jpg|thumb|right|200px|Diagram of facultative lagoons]]
=== Facultative Lagoons ===
[[File:Sewlag3.jpg|thumb|right|200px|Diagram of facultative lagoons]]
Excerpt from the [http://www3.epa.gov/npdes/pubs/faclagon.pdf EPA’s Wastewater Technology Fact Sheet on Facultative Lagoons].
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[[File:Aeratedlagoons.png|thumb|right|200px|An aerated lagoon]]
=== Aerated Lagoons ===
[[File:Aeratedlagoons.png|thumb|right|200px|An aerated lagoon]]
Excerpt from the [http://www3.epa.gov/npdes/pubs/apartlag.pdf EPA’s Wastewater Technology Fact Sheet on Aerated, Partial Mix Lagoons].
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[[File:Aerobiclagoons.png|thumb|right|200px|Diagram of aerated lagoons]]
=== Aerobic Lagoons ===
[[File:Aerobiclagoons.png|thumb|right|200px|Diagram of aerated lagoons]]
Aerobic lagoons, otherwise known as polishing ponds, are shallow impoundments, typically no more than 1 meter in depth. Dissolved oxygen concentrations are typically high due to wind and wave action that allow for natural reaeration. Aerobic ponds typically follow facultative or aerated ponds to provide final polishing by reducing biological demand, total suspended solids and pathogens through natural disinfection. Natural disinfection occurs as ultraviolet light penetrates the water column and kills the pathogens.
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[[File:Innovativelagoons.png|thumb|right|200px|Satellite Image of an innovative lagoon]]
=== Innovative Lagoons ===
[[File:Innovativelagoons.png|thumb|right|200px|Satellite Image of an innovative lagoon]]
Advanced Integrated Wastewater Pond Systems (AIWPS) have been developed by Professor William J. Oswald and his co-workers at the University of California, Berkeley over the past four decades. AIWPS are potentially feasible for application in the developing world. Although AIWPS may appear to be an adapted traditional pond system, each AIWPS facility designs and incorporates a series of low-cost ponds or earthwork reactors. A typical AIWPS facility consists of a minimum of four ponds in series: advanced facultative ponds, secondary facultative ponds or algal high rate ponds, algae settling ponds and maturation ponds.
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