ABSTRACT
Eutrophication corresponds to the increase of energy potential of the environment, which has repercussions on the entire ecosystem across its food webs, in running as well as stagnant waters. A large part of the phosphorus wastes came from phosphate fertilizers and polyphosphates from detergents, which contributed to the eutrophication of waters. Extreme eutrophication, with algal blooms followed by a degeneration phase and undersaturation of oxygen in the environment, leads to a dysfunctional ecosystem and may be the cause of significant mortality. Eutrophication and trophic pollution both correspond to an increase in the nutrient content of water, an increase in the energy potential of the ecosystem, but in two different forms. In the phenomenon of biodegradation that follows a trophic pollution, heterotrophic bacteria—chemo-organotrophic and chemotrophic—develop. They consume oxygen, and the sag curve of oxygen concentration testifies to bacterial activity.
