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Practitioner's Tool / UV Light (Natural Disinfection)

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'''Maturation Ponds''': Maturation ponds are often used as the final stage in constructed wetlands or sewage lagoons. Also called aerobic ponds, they are shallow in depth and typically not more than 1.3 meters deep, which allows the sunlight to penetrate through the entire water column. During the recommended minimum retention time of three days, the UV rays in the sunlight kill the bacteria and neutralize virus particles. Maturation ponds can be used after the majority of the suspended solids and organic matter have been removed through secondary treatment. Too much organic matter present in the effluent can generate odors. Too many residual solids may shield the bacteria from the UV light, resulting in only partial disinfection.<br/>

In order to work effectively, maturation ponds must be cleared of algae or plant matter. As sown in the image to the right, daily raking of algae may be required; however, since algae is a rich source of protein in animal feeds and as a compost additive, the recycling potential is high. If space is available and labor inexpensive, maturation ponds may be a good option for disinfection for your onsite wastewater system project.

 

''NOTE: Using passive maturation ponds for disinfection may produce variable results. Seasonal variation in sunlight, algal blooms, and the concentration of suspended solids in the effluent flowing into the pond are all factors that may influence results.''

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