Facultative lagoons are a type of waste stabilization pond used for biological treatment of industrial and domestic wastewater. Sewage or organic waste from food or fiber processing may be catabolized in a system of constructed ponds where adequate space is available to provide an average waste retention time exceeding a month. A series of ...

Partial mix lagoons are also called facultative aerated lagoons and are generally designed with at least three cells in series, with total detention time dependent on water temperature. The lagoons are constructed to have a water depth of up to 6 m (20 ft) to ensure maximum oxygen transfer efficiency when using diffused aeration.

A facultative lagoon may follow an aerated lagoon, 9 or it may follow another facultative lagoon. Facultative lagoons may also be used after other 10 types of treatment. For example, when a facultative lagoon is used after secondary treatment, it 11 is called a polishing lagoon. Lagoons used in series produce a final effluent containing

Facultative lagoons can be used to treat raw, screened, or primary settled municipal wastewater and biodegradable industrial wastewaters. Moderately effective in removing settleable solids, BOD, pathogens, fecal coliform, and ammonia. Easy to operate. Require little energy, with systems designed to operate with gravity flow.

Facultative type aerated lagoons have been more commonly used the world over because of their simplicity in operation and minimum need of machinery. They are often referred to simply as ‘aerated lagoons’. Their original use came as a means of upgrading oxidation ponds overloaded due to industrial wastes without adding to the land requirement.

Aerated Lagoons • Similarly configured to facultative lagoons • Primary difference - some level of supplemental aeration o By adding O2, we increase microbiological activity, which then reduces organics in the influent wastewater o Generally supplementing oxygen with mechanical aeration - accomplishing complete mix

Facultative lagoons, where there is insufficient energy provided by the aeration equipment to keep the sludge in suspension and solids settle to the lagoon floor. The biodegradable solids in the settled sludge then degrade as in an anaerobic lagoon .

Facultative lagoons, also known as facultative ponds or oxidation ponds, are engineered to leverage both aerobic and anaerobic decomposition processes. Essentially, they are large, shallow basins designed to treat wastewater through biological activity facilitated by the interaction of sunlight, bacteria, and algae.

Aerated lagoon technology, especi ally that of high-performance systems, is one of the most misunderstood technology in wa stewater treatment. This mi sunderstanding is largely the result of its evolution from the technology of facultative lagoons, in which algae play a vital role and hydraulic retention times are long.

Facultative lagoons used to treat domestic wastewaters provide an example of a highly stressed aquatic ecosystems. These lagoons consist of a shallow basin in which settleable solids introduced by the wastewater settle to the bottom to for …