Anerobic
Ponds - These are comparatively deep ponds with a depth of 3-5 meters to ensure anaerobic conditions. They can be operated with a high organic loading. Retention time for these ponds is about 30 days.
They are generally used for the pretreatment of strong organic wastes before adding them to facultative ponds. The main problem with such anaerobic ponds is the production of odor.
