aerobic-anaerobic lagoon

aerobic-anaerobic lagoon

[e′rōb·ik ′an·ə‚rōb·ik lə′gün]
(civil engineering)
A pond in which the solids from a sewage plant are placed in the lower layer; the solids are partially decomposed by anaerobic bacteria, while air or oxygen is bubbled through the upper layer to create an aerobic condition.