Water Pollution...

 Water Pollution

   The United Nations estimate that around 10 percent of the world's people don't have access to wash beverage that's over 700000000 people. the most problem with this untreated water is that it can carry diseases like cholera spread through untreated human feces. this is often particularly serious in shanty towns near big cities and in refugee camps. Rivers and streams also can be polluted with diseases from water coming from badly managed rubbish dumps. But human sewage isn't the sole substance that pollutes our water supplies most of the opposite substances humans allow to flee into streams rivers and therefore the oceans are more dangerous to natural ecosystems.

    Chemical fertilizers I'm far more soluble in water than organic manure based fertilizers so heavy rain can wash them into streams and lakes causing eutrophication. The fertilizers cause algae to grow in no time forming a mat on the lake surface this blocks sunlight from the vegetation deeper down which dies bacteria then feed off the dying vegetation and spend the remaining oxygen supply once the oxygen has gone all animal life dies the lake ecosystem is destroyed if heavy metals like lead mercury and cadmium get into rivers and lakes many animals will die. N. minimum to Japan a polluting mercury fungicide factory was closed 1968 yet folks that have continued to be suffering from the poisoning the so called minimum to disease ever since because the fish caught locally within the bay still have traces of mercury in them.

Nowadays the utilization of mercury and cadmium in fungicides has been largely replaced by copper and organic compounds. The removal of lead from petrol began within the seventies when it became clear that plumbism causing mental defects which cost a minimum of partially by the lead compounds added to petrol to form it better and more smoothly it's taken 40 years since then for a United Nations global ban on the sale of leaded petrol the last 6 nations complied in 2013. radioactive material is generally stored above ground in water tanks expecting more permanent underground storage where it's to be safe for many years there are fears that these underground stores could fail and contaminate water courses. Currently small amounts of material are allowed to be washed bent sea on the idea that it'll become so diluted that it'll make no difference to the natural background radioactivity tea within the oceans. Following a nuclear disaster like 5 mile island in 1979 Chernobyl in 1986 Fukushima in 2011 watercourses and therefore the oceans can become dangerously polluted with radioactive material . During mining and drilling operations to extract minerals from the world aquifers which are the underground watercourses can become polluted. Huge amounts of plastic thrown faraway from ships and washed bent sea from rubbish dumps ashore have ended up floating in huge islands of waste causing a significant threat to fish seabirds and other marine animals the so called great Pacific garbage patch is estimated to be half the dimensions of Europe and there are 4 others. Coal and oil fueled power stations are responsible more so within the past for causing acid precipitation which devastated many north European you lakes within the sixties see our video on acid precipitation for more on this. fuel and atomic power stations need large amounts of water for condensing the steam which drives that turbines this water is typically cooled on site within the great cooling towers.

  however the water are going to be returned to the river O. C. warmer than before and this will upset the river or sea ecosystems although not material pollution this waste heat may be a pollutant. So to summarize there are some ways mankind is polluting the rivers lakes and seas perhaps the foremost serious causing millions to become ill or die is pollution by human sewage. to find out how we are trying to purify wastewater and to form water fit drink C. R. link video water treatment.