Download Controlling Earth's Pollutants (Environment at Risk) by Christine Petersen PDF

By Christine Petersen

In setting in danger medical ideas, strategies, and methodologies in environmental technology are explored and defined.

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Effluents were buried instead of being properly disposed of. PFCs gradually collected in the soil and now exceed the EPA’s designated safe levels. Local groundwater has been polluted (though drinking water sources have not), and runoff has carried some sediments down to the Mississippi River. Cleanup costs are estimated at $18 million. solid materials. Some systems added tertiary (third-level) treatments that remove nutrients or heavy metals or that add pathogen-killing disinfectants, such as chlorine.

Solid materials. Some systems added tertiary (third-level) treatments that remove nutrients or heavy metals or that add pathogen-killing disinfectants, such as chlorine. Unfortunately, this did not entirely resolve sewage pollution. The first problem comes with older-style sewage-treatment systems called combined sewer systems (CSSs). These have two sets of pipes. One set carries sanitary sewage from homes and other buildings directly to the nearest treatment plant. Another set of pipes carries storm water that flows from the streets.

The first dumps were no great solution, either. Rarely more than holes into which trash was heaped, they tended to be smelly and attracted flies, rats, and other pests that can carry disease. Two devastating diseases, bubonic plague (sometimes called the black plague) and cholera, demonstrate the dangers of pollution from human waste and trash. In 1348 cases of bubonic plague began to appear in Europe. During the fourteenth century the plague recurred in several waves throughout Europe, killing millions of people.

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