What Is A Facultative Lagoon? How Does A Facultative Lagoon Work?
What Is A Facultative Lagoon?
A facultative lagoon is a waste stabilization pond used for the biological treatment of industrial and domestic wastewater. The water flows into the lagoon and then through an aerator, mixed with air and allowed to settle out before being pumped out again.
The purpose of these lagoons is to reduce contaminants in wastewater, which can then be discharged into receiving waters after treatment has been completed.
In addition, they may also be used as buffer zones between industrial facilities and residential areas so that there is no direct contact between residents and industrial waste streams that may pose health risks if ingested or inhaled by humans directly (i.e., if someone were swimming in this area).
How Does A Facultative Lagoon Work?
A facultative lagoon is a man-made system that uses natural processes to treat wastewater. The lagoon is lined with plastic and filled with sand, gravel, or other materials. It can be of any size, depending on how much water needs to be treated at one time.
The process starts when wastewater from the plant enters the lagoon through pipes at one end and exits out of another set of pipes at another end after treatment has taken place inside the structure.
Water flows slowly over these materials as it moves through them; this allows sediments in suspension within it to settle out onto their surfaces, during which time bacteria break them down into simpler compounds that are less harmful than before (i.e., less toxic).
Wastewater enters the facultative lagoon and flows through a detention basin where settleable solids introduced by the wastewater settle to the bottom for a sludge layer that decomposes anaerobically.
The wastewater then flows through a packed bed of solids that act as a biological filter. Finally, seepage from this bed allows for further treatment of contaminants in groundwater before being discharged into surface waters (rivers, lakes).
How Deep Is A Facultative Lagoon?
A facultative lagoon is usually 3 to 8 feet deep, but it may be deeper than you can swim in. The depth of the lagoon affects its productivity, as well as your maintenance costs:
– Shallow water means more algae growth on their surface and less time spent cleaning them.
– Deeper waters yield more biogas but at greater maintenance costs (for example, dredging out sediment buildup).
The facultative lagoon is designed so that the water from a shallow pond flows into the deep end, where it is exposed to anaerobic conditions and will decompose. This creates a nutrient-rich environment for algae growth on top of the lagoon floor, which acts as a natural filter for your wastewater.
What Is Facultative Vs Obligate?
Facultative interactions can take place or not, depending on the needs of the partners involved. Obligate interactions, on the other hand, must happen for one or both partners to survive.
Facultative means are optional. Facultative interactions have a low probability of occurring. Facultative interactions occur when the partners are not obligated to participate in the interaction but do so because it has some benefit for them.
– Aphids and ants – aphids feed on sap from plants, but they also excrete excess sugar water (honeydew) that attracts ants who harvest it and protect aphids from predators.
– Bacteria growing on teeth – mouth bacteria can cause cavities if left unaddressed by dental hygiene practices such as brushing your teeth regularly or flossing between them every day.
However, these bacteria may also play an essential role in maintaining oral health by producing compounds that prevent gum disease or fight off harmful invaders like fungi which could otherwise infect your gums if left untreated.
Obligate interactions are those that must take place for one or both partners to survive. Obligate interactions occur when the partners must participate in the interaction to survive. Facultative interactions are optional, whereas obligate interactions are not.
They can occur when either partner may participate in the interaction, but if they do participate, it is mandatory for both partners’ survival.
Example: A grasshopper and a bee pollinating flowers together is an example of facultative behavior because they don’t have to be there doing this particular task; however, if they were not present, then neither could survive (the grasshopper wouldn’t get any food and the bee would have no pollen).