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Sources and hazards of phosphorus-containing wastewater

Source: Xingwote Environmental Engineering Updated: 2017-03-27

Phosphorus is an essential element of living organisms. The total amount of phosphorus has a direct impact on the growth and development of all organisms, including humans, and the quality of the environment. Part of the phosphorus in the water body comes from the phosphorus-containing minerals in nature. After weathering, it enters the water body with rainwater runoff or is taken up by plants as nutrients. Although rainfall and snowfall are also part of the phosphorus source in nature, the phosphorus content in rainfall and snowfall is very low. Some investigations have shown that the average concentrations of phosphorus in rainfall and snowfall are lower than 0.04 and 0.02 mg / L, respectively. The other part comes from domestic sewage, industrial wastewater, farmland runoff and agricultural drainage produced by human activities. Phosphorous emissions per person per day in its sewage are between 1400mg and 3200mg. Among them, one of the main reasons for eutrophication of water bodies is phosphate-containing synthetic detergents, which account for about 60%. Most of the industrial wastewater is phosphorus-containing wastewater produced by phosphorus chemical industries such as yellow phosphorus, zinc phosphide, phosphorus-containing pesticides, phosphate fertilizers, and phosphorus-containing detergents. Phosphate fertilizer used for agricultural cultivation may be caused by severe soil erosion, a large amount of soil and water loss, and a large amount of phosphorus in the soil enters the water body. There are also excreta produced by raising a large number of livestock in rural farms and towns, which are directly discharged into the water body without any treatment. The phosphorus content exceeds the standard.

Phosphorus is an essential element in living organisms. When the phosphorus content in water is low, it will not pose a threat to the lives of human bodies and aquatic organisms. However, if the phosphorus content in the water body exceeds a certain amount, it will not only threaten human health, but also cause harm to aquatic life. Studies have shown that when the TP content in the water body exceeds 0.2 mg / L, it can promote the excessive reproduction of algae, destroy the balance of the original water body, and cause eutrophication pollution. The environmental harm caused by eutrophication of water bodies has the following aspects: The massive reproduction of algae in the water quickly reduces the dissolved oxygen in the water, which causes the aquatic organisms to suffocate and die due to lack of oxygen, and eventually causes the imbalance of water ecosystems such as lakes. After the death of a large number of organisms, their bodies were oxidized and decomposed to produce some toxic and harmful gases, such as hydrogen sulfide, which caused the water quality to deteriorate. In addition, the organic matter secreted by algae will release toxic and harmful substances by decomposing humic acid and other substances that are difficult to degrade. In addition to the above hazards, it will also affect the landscape. When the red tide of blooms occurs, the entire water surface is easily covered by algae , Hindering the beauty of the water body. It is more noteworthy that long-term drinking of phosphorus-containing water can cause osteoporosis and mandibular necrosis.