Causas de la contaminacion del agua ingles

Páginas: 2 (265 palabras) Publicado: 11 de diciembre de 2011
Causas De La Contaminacion Del Agua Ingles
Causas De La Contaminacion Del Agua Ingles
Causes of water pollution
The specific contaminants leading to pollution in water include a widespectrum of chemicals, pathogens, and physical or sensory changes such as elevated temperature and discoloration. While many of the chemicals and substances that are regulated may be naturallyoccurring (calcium, sodium, iron, manganese, etc.) the concentration is often the key in determining what is a natural component of water, and what is a contaminant.
A manholecover unable to contain a sanitary sewer overflow.Coliform bacteria are a commonly used bacterial indicator of water pollution, although not an actual cause of disease. Other microorganismssometimes found in surface waters which have caused human health problems include:
Burkholderia pseudomallei
Cryptosporidium parvum
Giardia lamblia
Novovirus and other virusesParasitic worms (helminths).
High levels of pathogens may result from inadequately treated sewage discharges.This can be caused by a sewage plant designed with less than secondarytreatment (more typical in less-developed countries).
Chemical and other contaminants
Muddy river polluted by sediment. Photo courtesy of United States Geological Survey.Contaminants may includeorganic and inorganic substances.
Organic water pollutants include:
Disinfection by-products found in chemically disinfected drinking water, such as chloroform
Foodprocessing waste, which can include oxygen-demanding substances, fats and grease
Insecticides and herbicides, a huge range of organohalides and other chemical compounds
Petroleum hydrocarbons,including fuels (gasoline, diesel fuel, jet fuels, and fuel oil) and lubricants (motor oil), and fuel combustion byproducts, from stormwater runoff
Tree and bush debris from logging operations
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