Contaminantes del agua recurso renovable

Contaminantes del agua recurso renovable

Contaminantes del agua material de uso docente,

Contaminantes del agua recurso renovable

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).

 

Escuela

Cumpleaños

Silvita

Diseñadora, Casada, dedico mi sitio a preservar el Arte y la Cultura Infantil, A la memoria de mi sobrina Laura Ambrosio Battistel. Material uso escolar y docente

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