Contaminantes del agua recurso renovable
Contaminantes del agua material de uso docente,
El agua pura es un recurso renovable,
sin embargo puede llegar a estar tan contaminada
por las actividades humanas,
que ya no sea útil, sino más bien nociva.
¿Qué contamina el agua?
Agentes patógenos.- Bacterias, virus, protozoarios,
parásitos que entran al agua provenientes
de desechos orgánicos.
Desechos que requieren oxígeno.-
Los desechos orgánicos pueden ser descompuestos
por bacterias que usan oxígeno para biodegradarlos.
Si hay poblaciones grandes de estas bacterias,
pueden agotar el oxígeno del agua,
matando así las formas de vida acuáticas.
Sustancias químicas inorgánicas.-
Acidos, compuestos de metales tóxicos
(Mercurio, Plomo), envenenan el agua.
Los nutrientes vegetales pueden ocasionar el
crecimiento excesivo de plantas acuáticas
que después mueren y se descomponen,
agotando el oxígeno del agua y de este modo
causan la muerte de las especies marinas
(zona muerta).
Sustancias químicas orgánicas.-
Petróleo, plásticos, plaguicidas,
detergentes que amenazan la vida.
Sedimentos o materia suspendida.-
Partículas insolubles de suelo que enturbian el agua, y
que son la mayor fuente de contaminación.
Sustancias radiactivas
que pueden causar defectos congénitos y cáncer.
Calor.- Ingresos de agua caliente que disminuyen
el contenido de oxígeno y hace a
los organismos acuáticos muy vulnerables.
Fuentes Puntuales Y No Puntuales
Las fuentes puntuales descargan contaminantes
en localizaciones específicas a través de tuberías y
alcantarillas.
Ej: Fábricas, plantas de tratamiento
de aguas negras, minas, pozos petroleros, etc.
Las fuentes no puntuales son grandes áreas de terreno
que descargan contaminantes al agua sobre una región extensa.
Ej: Vertimiento de sustancias químicas, tierras de cultivo,
lotes para pastar ganado, construcciones, tanques sépticos.
Contaminación De Ríos Y Lagos
Las corrientes fluviales debido a que fluyen se
recuperan rápidamente del exceso de calor y
los desechos degradables.
Esto funciona mientras no haya
sobrecarga de los contaminantes, o
su flujo no sea reducido por sequía, represado, etc.
Contaminación Orgánica.-
En los lagos, rebalses, estuarios y mares, con
frecuencia la dilución es menos efectiva que
en las corrientes porque tienen escasa fluencia,
lo cual hace a los lagos más vulnerables a la
contaminación por nutrientes vegetales
(nitratos y fosfatos) (eutroficación).
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