On the news, you can always see the news of river pollution. How harmful is river pollution to us? So I made a survey about river pollution.

2. Investigation plan

1 Understand the harm of sewage to human body through the Internet.

Understand the causes of sewage through books.

Three. survey

Specific content of information channel investigation

1 70%-80% of human body is water, so drinking inferior water for a long time will naturally weaken the body's resistance, and various diseases are inevitable. Moreover, when the pollutants accumulated for a long time reach the body and cannot be tolerated, no matter how clever the doctor is, no matter how effective the drug is, I am afraid it will be difficult to work. So the sentence "Water is the king of all medicines" is true.

First of all, tourists pollute the water. Because our city is located in the lower reaches of Lixia River and Taidong River, industrial wastewater discharged by Xinghua industrial enterprises, domestic sewage discharged by urban areas and market towns in the upper reaches, and organic pollution caused by farmers pushing straws into the river to rot and deteriorate have all flowed into our city. The second is the pollution of urban life. It is mainly the water pollution caused by a large amount of washing water for urban and rural residents, a large amount of fecal water discharged from combined septic tanks and urban and rural domestic garbage. The third is agricultural pollution. Rice and cotton are planted in Tongyu River, but the amount of chemical fertilizers and pesticides used in the process of planting rice and cotton is relatively large, but only 30-40% of them are really absorbed by crops, and most of them enter the water body, which will inevitably aggravate the pollution degree of Tongyu River.

1 the harm of internet sewage to human body.

2 the causes of sewage caused by books

Four conclusions

There are 300 million people in rural areas of China who have unsafe drinking water, of which 654.38+0.9 billion are water quality problems. According to the survey, nearly half of the lakes in China are in a state of serious eutrophication, which is mainly caused by agricultural non-point source pollution and human and animal manure discharge in these areas. One third of nitrogen and phosphorus pollutants in water come from agricultural non-point source pollution. Because most of the water sources in China are in mountainous areas and soil erosion areas, soil erosion, as a carrier, not only transports a lot of sediment, but also transports a lot of fertilizers, pesticides and domestic garbage. Fertilizers, nitrogen, phosphorus and pesticides accumulated in drinking water sources, especially well water, have threatened the health of millions of people in at least 13 provinces, and agricultural non-point source pollution has reached a situation where it must be controlled.

Keywords: agricultural water quality problems, eutrophication and health pollution

Pollution not only threatens human beings, but also brings huge losses to fisheries. It seriously kills fish and shrimp, interferes with fish reproduction and greatly reduces the yield and quality of fish. Sewage also pollutes farmland and crops and reduces agricultural output. Water pollution also causes other environmental degradation, affecting people's sightseeing, entertainment and recuperation.

Water is not only the source of life, but also extremely important to human beings, and the pollution is so serious. Therefore, we should prevent and protect water resources and make rational use of them.