The Presence of Phosphorus in Natural Water Systems

Excess phosphorus may lead to ecological damage such as eutrophication, so the existence of phosphorus (P) in natural systems such as rivers and lakes is of research concern. This excessive phosphorus may originate from various sources, such as wastewater treatment facilities, agricultural water, or urban spilled water. This is why various investigations are focused on phosphorus loading and transport simulation in these natural systems. Morphological data and so on, the different parameters between them are different, but the type of system, source of excess phosphorus (dotted line source: sewage treatment plant or diffusion source:

Eutrophication may be caused by phosphorus point input (such as drainage of sewage) or astigmatic input of phosphorus (such as agricultural outflow). The eutrophication and recovery trajectory depends on whether most of the phosphorus is point input or astigmatism input. In developed countries, most freshwater eutrophication is mainly caused by astigmatic phosphorus inflow from agriculture (6). In developing countries, the situation varies, but the trend in the use of fertilizer indicates that astigmatic phosphorus input will increase (4, 7). In such a case, reducing soil phosphorous is an important step in relaxing eutrophication. Balancing the phosphorus balance for agriculture is not enough to reduce soil phosphorus and reduce eutrophication (Figure 3A). In order to improve water quality it is necessary to reduce soil phosphorus concentration

Overnutrition or eutrophication is one of the most serious water quality problems confronting the river and its tributaries. Nitrogen and phosphorus are essential elements for all ecosystems. However, many of these nutrients in the natural system are harmful. The St. John's River exceeds the assimilation ability of nitrogen and phosphorus. In other words, river water contains more nutrients than "dilution". Excess nutrients breed uncontrolled algae, consume the oxygen in the water needed for fish, reduce the light essential for underwater vegetation, and threaten human health and aquatic life. Rivers were affected by excess nutrients such as wastewater treatment facilities, industrial waste, septic tank failure, rainwater runoff, and fertilizer flowing into the river on a regular basis.