Natural water pollution remediation:
Natural water body refers to the water body with certain self-repairing ability in nature, including rivers, lakes, reservoirs, ponds and the sea.
In a certain time and space range, if pollutants are discharged into natural water in large quantities and exceed their self-purification decomposition ability, the physical and chemical properties of water and sediment will be changed, the composition of biological communities in water will be changed, resulting in deterioration of water quality, reduction or even loss of water use value, which is called water pollution.
Natural water pollution and its characteristics:
(1) Organic suspension and sediment
Organic pollutants are mainly manifested as providing nitrogen and phosphorus for algae aquatic organisms to multiply in large quantities, thereby reducing dissolved oxygen concentration in water and causing water body to deteriorate and stink.
(2) Water eutrophication
Eutrophication of water body refers to the phenomenon that under the influence of human activities, nutrients such as nitrogen and phosphorus needed by organisms enter into slow-flowing water bodies such as lakes, estuaries, reservoirs and ponds in large quantities, which causes rapid reproduction of algae and other plankton, decrease of dissolved oxygen in plastids, deterioration of water body and mass death of fish and other organisms.
(3) Pollution of petroleum and petroleum products
Petroleum is a mixture of alkanes, olefins and aromatic hydrocarbons. The hazards of entering water are various. If oil film is formed on water, it can hinder the reoxygenation of water body. Oil adheres to the gills of fish and can asphyxiate them. If it adheres to algae and plankton, it can kill them. Oil inhibits the spawning and hatching of waterfowl, and causes a large number of bird deaths in severe cases.
(4) Heavy metal pollution, inorganic chemical pollution and pathogenic bacteria pollution, etc.
Heavy metal pollution mainly comes from the waste water of pesticides, medicines, instrumentation and various non-ferrous metal mines, such as mercury, cadmium, chromium, lead, arsenic and other heavy metal ion poisons. It is relatively stable in the water, and is a highly toxic substance polluting the water body. Through the biological enrichment effect, heavy metals can be enriched thousands of times in organisms, which not only affects the effective use of water resources, but also affects the effective use of water resources. It has a great impact on public health.