The Downstream Changes of Pollution in the River Cray

Changes in pollution of downstream river downstream of river clay ============ River Clay finally enter the nearby swamp Darent river, by entering Sidcup Crayford, Dartford, the monastery garden We started with Orpington's original introduced. The river route passes through many urban areas, which will undoubtedly increase water pollution. The river is on a lowland, a top river. Purpose === Investigate downstream changes in Cray River pollution.

First I will talk about the environment. There are some imminent problems. Some factories pollute our river, destroy life inside and outside these rivers, and affect all downstream lives. Thousands of such factories throughout the world attracted their decisions. We are addicted to water. I need to clean it up. We are contaminating the air by burning coal and oil for factories and transportation and burning large amounts of forests and plants for logging and agriculture. Respiratory diseases are on the rise, and people will die here. Clean energy - The shift to existing technology is a matter of life and death.

In recent years, West Virginia water pollution has also been widely discussed after the Elk River chemical spills. In 2014, a chemical called MCHM leaked into the Elk River and polluted the water downstream of Charleston, West Virginia. There are nine counties in affected areas, the residents still believe that today's water has not been completely cleaned up. In California alone, 400 rural communities contain large amounts of nitrate in the water, so we can not provide clean drinking water to the residents. It comes from sources of fertilizer, agricultural chemicals and other agricultural activities. Arsenic contamination in these areas is also increasing. Unfortunately, because of the small population of these areas, the benefits of purifying water are not worth and are subject to economic problems. Low-income communities throughout the United States are suffering from dirty, dangerous drinking water

In the water and sediments of the Mississippi River, various pollutants from local pollution sources, industries, agriculture sources were found. Concentrations of trace metals and organic compounds are relatively low in addition to industrial and municipal waste naturally present in water, agricultural and those derived from outflow from urban areas. However, in some cities, downstream we have discovered high concentrations of bacteria related to human excrement, and these bacteria are due to insufficient treatment of sewage to the river. For example, the concentration of New Orleans is many times higher than the downstream concentration in the city. Contaminants have little effect on the composition of the benthic invertebrate population, indicating a change in water quality. Water samples collected in New Orleans show relatively high dissolved oxygen levels and low BOD