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An aerated lagoon (or aerated pond) is a simple wastewater treatment system consisting of a pond with artificial aeration to promote the biological oxidation of wastewaters. [1] [2] [3] [4]
Facultative lagoon (polishing pond) providing tertiary treatment after a constructed wetland in Hamburg-Allermöhe, Germany. Overflow from the facultative lagoon may be routed through one or more polishing ponds supporting lower populations of anaerobic micro-organisms and a higher proportion of aerobic organisms adapted to survival in lower concentrations of organic material.
Water aeration is the process of increasing or maintaining the oxygen saturation of water in both natural and artificial environments. Aeration techniques are commonly used in pond, lake, and reservoir management to address low oxygen levels or algal blooms. [1]
The main function of the tertiary stage in maturation ponds is the removal of pathogens, although it may also assist in nutrient reduction (i.e. nitrogen). [12] However, nitrogen fixation by algae living in stabilization pond systems may increase nitrogen levels in stabilization pond effluent. [6]
When full, the reservoir covers 1,234 acres (4.99 km 2), has a maximum water depth of 115 feet (35 m), and a shoreline of 27 miles (43 km). [1] Lake Hodges is owned by the City of San Diego and supplies water to the San Dieguito Water District and Santa Fe Irrigation District. Lake Hodges has a total capacity of 30,251 acre-feet of water. [2]
Aeration fountains, funded by donations, have been installed to help with this problem. "Water quality in an area of about one acre around each unit is improved by the transfer of oxygen from the air, and by mixing the top and bottom layers of the Lake." [31] A proposed aeration system was never approved by the City of Oakland. [citation needed]
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