Confidence votes 4.8K. The base meanining of un pigeonnier is a dovecote (a structure where doves, or similar birds, are bred or housed). But you will also find un pigeonnier used to mean a garret-flat, or any small flat near the top of a building (especially if it is a low-rent sort of place).
Duckweed creates an anaerobic environment. When it comes to wastewater lagoons, the lack of dissolved oxygen is bad. (Read our previous article, Troubleshooting Low Lagoon Dissolved Oxygen, for an in-depth look.) Duckweed is a DO killer, blocking the oxygen-transferring interface between the surface of the lagoon and the atmosphere.
Dissolved-oxygen gas is released as a by-product. In aquatic environments, free-floating microscopic plants known as algae, and larger submersed plants (macrophytes) , release oxygen directly into the water where it is used by animals and other organisms, including the plants themselves.xygen from the Atmosphere. In addition to plant-generated oxygen, the earthâs atmospheric pressure is constantly pushing tiny molecules of dissolved-oxygen gas into the surface waters of our lakes, ponds, oceans, and swimming pools â even the glass of water on your kitchen counter. The process is known as diffusion.