CONTAMINACION DE AGUAS
“AÑO DEL BUEN SERVICIO AL CIUDADANO”
UNIVERSIDAD NACIONAL DE PIURA ESCUELA TECNOLOGICA SUPERIOR MEDIO AMBIENTE Y SEGURIDAD INDUSTRIAL
TEMA : CONTAMINACIÓN DEL AGUA . CURSO : CONTAMINACIÓN DE SUELOS Y AGUAS SUBTERRÁNEA . PROFESOR : LUIS ANTONIO ANTONIO FERIA ROSAS . INTEGRANTES :
SOSA SERNAQUE FRANCISCO . NEYRA VALLE KATERINE .
GUTIERREZ PALACIOS WILLINGTON .
GOMEZ ARRELLANO EDGAR .
ACUÑA MORAN KENFRY .
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CONTAMINACION DE AGUAS
INDICE
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CONTAMINACION DE AGUAS
INTODUCCIÓN
El agua es el elemento más abundante del planeta. Se calcula que la Tierra mide unos 510 millones de kilómetros cuadrados, de los cuales unos 365 millones se encuentran cubiertos por los océanos y mares. Ellos representan el 97% del agua del planeta. El restante 3% se reparte en lagos y ríos. Aunque esta cantidad de agua dulce parece pequeña, es fundamental para la vida animal y vegetal. El agua de lagos y ríos y vertientes se llama "dulce" para diferenciarla del agua salada de los mares, aunque en realidad el agua pura es incolora, inodora e insípida (sin color, sabor, ni olor). En el ambiente acuático (tanto de agua salada como dulce) vive una enorme cantidad de organismos vivos, como peces y vegetales (algas). Además el agua es indispensable en la supervivencia de casi todos los organismos vivos del planeta. La contaminación del agua atenta no sólo contra la l a supervivencia de los seres que habitan en ella, sino también contra quienes beben de las fuentes contaminadas, sean seres humanos, animales o plantas. Existen básicamente dos formas de contaminación del agua, las de causa natural y las generadas por el hombre.
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CONTAMINACION DE AGUAS
1) OBJETIVOS: 1.1) Objetivos generales
Dar a conocer el problema problema de la contaminación contaminación del agua, sus sus causas causas y sus efectos, además de las posibles soluciones.
1.2) Objetivos Específicos
Reconocer la importancia importancia del agua para los seres vivos y los ecosistemas
Identificar las diferentes fuentes y tipos de contaminación del agua.
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CONTAMINACION DE AGUAS
2) MARCO TEÓRICO a) EL AGUA: El agua es la sustancia líquida, transparente, inodora, incolora e insípida, fundamental para el desarrollo de la vida en la Tierra, cuya composición molecular está constituida por dos átomos de hidrógeno y uno de oxígeno, manifiesta en su fórmula química H2O. La palabra proviene del latín aqua, que significa, efectivamente, ‘agua’.
b) CONTAMINACIÓN DEL AGUA: Es cualquier cambio químico, físico o biológico en la calidad del agua que tiene un efecto dañino en cualquier cosa viva que consuma ese agua. Cuando los seres humanos beben el agua contaminada tienen a menudo problemas de salud. C) ECOSISTEMA:
Se denomina ecosistema al conjunto de organismos vivos (biocenosis) que se relacionan entre sí en función del medio físico en el que se desarrollan (biotopo).
d) EL AGUA POTABLE: Llamamos agua potable al agua que podemos consumir o beber sin que exista peligro para nuestra salud. El agua potable no debe contener sustancias o microorganismos que puedan provocar enfermedades enfermedades o perjudicar perjudicar nuestra salud. Por eso, antes de que el agua llegue a nuestras casas, es necesario que sea tratado en una planta potabilizadora. En estos lugares se limpia el agua y se trata hasta que está en condiciones adecuadas para el consumo humano. Desde las plantas potabilizadoras, el agua es enviada hacia nuestras casas a través de una red de tuberías que llamamos red de abastecimiento o red de distribución de agua.
e) EUTROFIZACIÓN: Proceso natural en ecosistemas acuáticos, especialmente en lagos, caracterizado por un aumento en la concentración de nutrientes como nitratos y fosfatos, con los consiguientes cambios en la composición de la comunidad de seres vivos
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CONTAMINACION DE AGUAS
g) AGUAS RESIDUALES: Son las aguas residuales domésticas y que son el resultado de las actividades cotidianas de las personas. Por ejemplo, la que eliminamos a través de los lavaplatos, artefactos sanitarios .
H) LA DEMANDA QUÍMICA DE OXÍGENO (DQO) Se define como cualquier sustancia tanto orgánica como inorgánica susceptible de ser oxidada, mediante un oxidante fuerte. La cantidad de oxidante consumida se expresa en términos de su equivalencia en oxígeno. DQO se expresa en mg/l O2. i) METALES PESADOS
Los metales pesados normalmente aparecen en el agua superficial procedentes de las actividades comerciales e industriales y tienen que eliminarse si el agua residual se va a reutilizar. Se consideran metales pesados aquellos elementos metálicos con gran peso atómico, por ejemplo: mercurio, cromo, cadmio, arsénico, plomo, cobre, zinc y níquel. A bajas concentraciones pueden pueden afectar a los seres vivos y tienden a acumularse en la cadena alimentaria.
J) AGUAS NEGRAS Se llama aguas negras a aquel tipo de agua que se encuentra contaminada con sustancia fecal y orina, que justamente proceden de los desechos orgánicos tanto de animales como de los humanos. La denominación de aguas negras tiene sentido porque justamente la coloración que presentan las mismas es negra.
K) LIXIVIADO se denomina lixiviado al líquido resultante de un proceso de percolación de percolación de un fluido a través de un sólido. El lixiviado generalmente arrastra gran cantidad de los compuestos presentes en el sólido que atraviesa. L) PERCOLACIÓN Se refiere al paso lento de fluidos a través de materiales porosos. Ejemplos de este proceso son la filtración y la lixiviación.
LL) SISTEMA SÉPTICO Un tanque séptico es un recipiente o cámara cerrada en donde se depositan temporalmente las aguas negras provenientes de una casa, de un conjunto
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CONTAMINACION DE AGUAS
3) ANALISIS DE LA LEY DE RECURSOS HÍDRICOS 29338 El agua es un recurso que cada día viene cobrando más interés en nuestro país, la necesidad de contar con una nueva ley, acorde a las necesidades actuales era por decir lo menos, impostergable. La antigua ley del agua 17752 (24-Jun1969) fue dada en un escenario de gobierno militar que venia implementando una reforma agraria, y por lo tanto t anto es lógico que esta ley tenga un sesgo agrario y así se mantuvo durante cerca de 40 años. El pasado 31 de Marzo se público la Ley N° 29338 de Recursos Hídricos, llamada así según los especialistas especialistas por que regula no solo el uso del del agua como un recurso sino los bienes asociados a él, sean estos naturales (faja marginal, cauces, material de acarreo, glaciares, etc.) o artificiales (captaciones, almacenamiento, conducción, medición, saneamiento, etc.). La polémica esta abierta, pues algunos señalan que esta ley es privatista y el gobierno a través de sus funcionarios mencionan lo contrario. Mucho de esta discusión ha sido generado por el Legislativo, pues la manera como se aprobó la norma y los cambios de última hora en artículos importantes de la ley hace entrar en sospechas. El programa radial TIERRA FECUNDA organizó una mesa redonda con el fin de analizar aspectos de la norma, la misma que pongo en conocimiento de todos los seguidores de esta página y poder tener mayores elementos de análisis de esta Ley.
4) COMIENZOS DE LA CONTAMINACIÓN DEL AGUA La contaminación del agua es causada por las actividades humanas, se
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CONTAMINACION DE AGUAS
Durante la revolución industrial (entre la segunda mitad del siglo XVIII y los primeros años del siglo XIX) el aumento de los bienes de consumo y sus procesos de producción requerían de la utilización de una gran cantidad de agua para la transformación de las materias primas. A su vez, los influentes de dichos procesos productivos eran vertidos en los cauces naturales de agua sin ningún tipo de depuración, con sus desechos contaminantes correspondientes. Aquí comenzó a extenderse el grave problema de la contaminación del agua.
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CONTAMINACION DE AGUAS
5 ) DISTRIBUCION DEL AGUA EN LA TIERRA 6) CICLO DEL AGUA
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CONTAMINACION DE AGUAS
evaporación del agua en la tierra, las precipitaciones del agua contenida en la nubes entre otros, sin causar variaciones en la cantidad total de agua ag ua contenida en el planta. El ciclo del agua se lleva a cabo de dos formas interna y externa, el ciclo interno consiste en la formación del agua de origen magmático mediante reacciones químicas, el agua que allí se forma puede salir a la superficie al mome nto de los volcanes hacen erupción o a través de aguas termales. El ciclo externo por otro lado comienza con la evaporación del agua contenida en los depósitos, como mares, ríos y muchos otros, también la transpiración de las plantas y la sudoración en los animales, aportan agua que es evaporada y elevada a las nubes y gracias a las bajas temperaturas se enfría y se condensa en la nubes transformándose en agua. Luego las gotas producidas por la condensación se unen formando así nubes que pos su tamaño y peso termina cayendo a la superficie de la tierra, pudiendo ser de dos tipos sólida (granizo o nieve, debido a las bajas temperaturas) o líquida. El agua al llegar a la superficie puede tener varios destinos, unos de ellos es su utilización en los procesos orgánicos de los seres vivos, otra parte es infiltrada a través de los poros de la tierra, colocandose en depósitos subterráneos y por último gracias a la escorrentía que provoca que el agua se desliza a través de las distintas superficies hasta llegar a los mares, lagos y ríos.
7) CONTAMINACIÓN DEL AGUA La contaminación del agua se entiende como la acción de introducir algún material en el agua alterando su calidad y su composición química. Según la Organización Mundial de la Salud el agua está contaminada “cuando su composición se haya modificado de modo que no reúna las condiciones necesarias para el uso, al que se le hubiera destinado en su estado natural”. El
agua que procede de ríos, lagos y quebradas es objeto de una severa contaminación, muchas veces producto de las actividades del hombre. El agua es un elemento esencial de la naturaleza, contribuye al bienestar general del hombre, de los animales y de las plantas. Es uno de los pocos elementos sin los cuales no podría mantenerse la vida en el planeta.
Los residuos de plástico que son arrojados al mar matan a un millón de
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CONTAMINACION DE AGUAS
A medida que crecen las poblaciones, se complican los ciclos ecológicos ecológicos de las aguas. Los habitantes de zonas urbanas descargan sus residuos en ríos que en muchas ocasiones ocasiones no son depurados y las industrias industrias liberan sin control control sustancias que las bacterias son incapaces de eliminar. Otro gran problema del agua es el mal uso que se le ha dado. Se utiliza agua potable para regar sembrados, sembrados, para disfrute y recreación, y para diversos usos domésticos e industriales. Se olvida muchas veces, que este es un recurso no renovable y vital para el hombre y los seres vivos.
7.1 PRINCIPALES CONTAMINANTES DEL AGUA Basuras, desechos desechos químicos químicos de las fábricas, industrias, etc. demandan oxígeno (en (en su mayor Aguas residuales y otros residuos que demandan parte materia orgánica, cuya descomposición produce la desoxigenación desoxigenación del agua). patógenos, tales como como bacterias, virus, virus, protozoarios, parásitos parásitos Agentes patógenos, que entran al agua provenientes de desechos orgánicos, que incluyen heces y otros materiales que pueden ser descompuestos por bacterias aerobias. vegetales que pueden pueden estimular el crecimiento de las plantas plantas Nutrientes vegetales acuáticas. Éstas, a su vez, interfieren con los usos a los que se destina el agua y, al descomponerse, agotan el oxígeno disuelto y producen olores desagradables. Productos químicos, incluyendo los pesticidas, diversos productos industriales, las sustancias tensoactivas contenidas en los detergentes, y los productos de la descomposición de otros compuestos orgánicos. especialmente el procedente de los vertidos accidentales. accidentales. Petróleo, especialmente Minerales inorgánicos y compuestos químicos. Sedimentos formados por partículas del suelo y minerales arrastrados por las tormentas y escorrentías desde las tierras de cultivo, los suelos sin protección (cobertura vegetal), las explotaciones mineras, las carreteras y los derribos urbanos. radioactivas procedentes de los los residuos producidos producidos por la Sustancias radioactivas minería y el refinado del uranio y el torio, las centrales nucleares y el uso industrial, médico y científico de materiales m ateriales radiactivos.
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CONTAMINACION DE AGUAS
Vertimiento de basuras y desmontes en las aguas. Es costumbre generalizada en el país el vertimiento de basuras y desmontes en las orillas del mar, los ríos y los lagos, sin ningún cuidado y en forma absolutamente desordenada. Este problema se produce especialmente cerca de las ciudades e industrias. La basura contiene plásticos, vidrios, latas y restos orgánicos, que o no se descomponen o al descomponerse producen sustancias tóxicas (el hierro produce óxido de hierro), de impacto negativo. Vertimiento de relaves mineros. Esta forma de contaminación de las las aguas es muy difundida y los responsables son los centros mineros y las concentradoras. Los relaves mineros contienen fierro, cobre, zinc, mercurio, plomo, arsénico y otras sustancias sumamente tóxicas para las plantas, los animales y el ser humano. Otro caso es el de los lavaderos de oro, por el vertimiento de mercurio en las aguas de ríos y quebradas. químicos y desechos desechos industriales. Consiste Consiste en Vertimiento de productos químicos la deposición de productos diversos (abonos, petróleo, aceites, ácidos, soda, aguas de formación o profundas, etc.) provenientes de las actividades industriales.
NOTA: Más de 5 millones de personas mueren cada año por beber agua contaminada. del agua agua que consume la población población mundial mundial es agua subterránea. El 90% del aceite para coches penetran en la tierra y 4 litros de pintura o 1 litro de aceite contaminan 1 millón de litros de agua potable. derramados en la tierra contaminan contaminan 3 millones de litros 4 litros de gasolina derramados de agua.
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CONTAMINACION DE AGUAS
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CONTAMINACION DE AGUAS
Lo más eficaz para luchar contra este tipo de contaminación es disminuir la cantidad de fosfatos y nitratos en los vertidos, usando detergentes con baja proporción de fosfatos, empleando menor cantidad de detergentes, no abonando en exceso los campos, usando los desechos agrícolas y ganaderos como fertilizantes, en vez de verterlos, etc. En concreto:
Tratar las aguas residuales en EDAR (estaciones (estaciones depuradoras de aguas residuales) que incluyan tratamientos biológicos y químicos que eliminan el fósforo y el nitrógeno.
Almacenar adecuadamente el estiércol que se se usa en agricultura.
Usar los fertilizantes más eficientemente.
Cambiar las prácticas de cultivo a otras menos contaminantes. contaminantes. Así, por ejemplo, retrasar el arado y la preparación de los campos para el cultivo hasta la primavera y plantar los cultivos de cereal en otoño asegura tener cubiertas las tierras con vegetación durante el invierno con lo que se reduce la erosión.
b) POR EL PETROLEO EN EL MAR En nuestras sociedades el petróleo y sus derivados son imprescindibles como fuente de energía y para la fabricación de múltiples productos de la industria química, farmacéutica, alimenticia, etc. Por otro lado, alrededor del 0,1 al 0,2% de la producción mundial de petróleo
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CONTAMINACION DE AGUAS
No es fácil calcular la cantidad y el origen de petróleo que llega al mar y, de hecho, sólo disponemos de valores poco exactos. Valores estimados según diversos estudios son: Año Toneladas vertidas 1973 6.110.000 1979 4.670.000 1981 3.570.000 1983 3.200.000 1985/1989 2.400.000 Entre los estudios que se han hecho destacan los de la National Academy of Sciences de los EEUU. Publicó su primer informe en 1975 (datos correspondientes al año 1973) y posteriormente otro en 1985 (con algunas cifras completadas en 1989). Con datos extraídos de estos informes, y de otras fuentes, se puede resumir que la cifra global de petróleo que llega al mar cada año es de unos 3.000.000 toneladas métricas (rango posible entre 1.7 y 8.8 millones de toneladas), y la procedencia de este petróleo vertido al mar sería: Por causas naturales Desde tierra Por funcionamiento de petroleros Por accidentes Por explotaciones petroleo en mar Por otros buques
10% 64% (de ellas un 15 a un 30% por aire ) 7% 5% 2% 12%
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CONTAMINACION DE AGUAS
Las aves y los mamíferos se ven afectados por la impregnación de sus plumas y piel por el crudo, lo que supone su muerte en muchas ocasiones porque altera su capacidad de aislamiento o les impermeabiliza. Los daños no sólo dependen de la cantidad vertida, sino también del lugar, momento del año, tipo de petróleo, etc. Un simple vertido de limpieza de tanques de un barco -el StylisSt ylis- mató en Noruega a 30 000 aves marinas en 1981, porque fue arrastrado directamente a la zona donde estas aves tenían sus colonias. La mayoría de las poblaciones de organismos marinos se recuperan de exposiciones a grandes cantidades de petróleo crudo en unos tres años, aunque si el petróleo es refinado o la contaminación se ha producido en un mar frío, los efectos pueden durar el doble o el triple.
b.3) MÉTODOS DE PREVENCIÓN:
Usar y desperdiciar menos petróleo. Colectar aceites usados en automóviles y reprocesarlos para el reuso. reuso. Prohibir la perforación y transporte de de petróleo en áreas ecológicamente ecológicamente sensibles y cerca de ellas. Aumentar en alto grado grado la responsabilidad responsabilidad financiera de las las compañías petroleras para limpiar los derrames de petróleo. Requerir que que las compañías compañías petroleras pongan a prueba rutinariamente rutinariamente a sus empleados. Reglamentar estrictamente estrictamente los procedimientos de seguridad y operación operación de las refinerías y plantas.
b.4 ) MÉTODOS DE LIMPIEZA:
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CONTAMINACION DE AGUAS
El agua de lluvia típica tiene un pH de cerca de 5 a 6. Esto significa que de forma natural no es neutro, es un líquido levemente ácido. Durante la precipitación por ejemplo agua de lluvia disuelve gases como dióxido de carbono y oxígeno. La industria ahora emite grandes cantidades de gases acidificantes, por ejemplo los óxidos sulfúricos y monóxido de carbono. Estos gases también se disuelven en el agua de lluvia. ¿Causa esto un cambio en el pH de la precipitación? el pH de la lluvia bajará a un valor de o por debajo de 4. Cuando una sustancia tiene un pH por debajo de 6,5, es ácida. Cuanto más bajo es el pH, más ácida es la sustancia. Esta lluvia con un pH más bajo que de forma natural, debido a las emisiones industriales, se llama lluvia ácida
9) FUENTES DE CONTAMINACIÓN DEL AGUA Algunas fuentes de contaminación del agua son naturales. Por ejemplo; el mercurio que se encuentra naturalmente en la corteza de la Tierra y en los océanos genera contaminación de forma natural de estos. Algo similar pasa con los hidrocarburos y con muchos otros productos. Normalmente las fuentes de contaminación natural son muy dispersas y no
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CONTAMINACION DE AGUAS
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CONTAMINACION DE AGUAS
9.3Las 9.3 Las fuentes naturales. Estas se refieren a los incendios o actividad volcánica. 9.4 Fuentes Fuentes tecnológicas: En cuanto a los consumos industriales y domésticos, hablamos de productos químicos. También se incluyen los transportes a motor que precisan de lubricantes. 10. CARACTERÍSTICAS DE AGUAS RESIDUALES DE LAS DISTINTAS ACTIVIDADES ACTIVIDADES HUMANAS. HUMANAS. 10.1 ORIGEN DOMÉSTICO Las aguas domésticas son las que provienen de núcleos urbanos. Contienen sustancias procedentes de la actividad humana (alimentos, deyecciones, basuras, productos de limpieza, jabones, etc.). La contaminación de un agua usada urbana se estima en función de su caudal, de su concentración en materias en suspensión y de su demanda biológica. Se admite que un habitante de una comunidad concreta, en un país o región
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CONTAMINACION DE AGUAS 10.3 ORIGEN PLUVIAL Al llover, llover, el agua arrastra toda la suciedad que encuentra encuentra a su paso, presentándose presentándose más turbia que la que se deriva del consumo doméstico. En las ciudades esta agua arrastra aceites, materia orgánica y diferentes contaminantes de la atmósfera, en el campo arrastran pesticidas, abonos, etc. En la industria las aguas pluviales arrastran las sustancias que se han caído sobre el terreno, pudiendo presentar un gran problema si son sustancias tóxicas. Además, si existe acumulación de residuos en zonas no preparadas para ello, los lixiviados de los residuos serán arrastrados. Es conveniente tener una red de pluviales, aunque aunqu e según la composición que tenga, se decidirá su unión al colector que desemboca en la depuradora o se realizará una desviación vertiendo directamente a las aguas superficiales.
La siguiente tabla muestra una lista de posibles fuentes de contaminación de las aguas subterráneas :
Lugar de
Fuentes de contaminación potenciales de aguas subterráneas
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CONTAMINACION DE AGUAS
e de suelo
aguas residuales
nto subterráneos
pozos: construidos inadecuadame nte o abandonados
inadecuadamen te o abandonados
11) DEPURACIÓN Los acuíferos tienen una cierta capacidad de autodepuración, mayor o menor según el tipo de roca y otras características. Las sustancias contaminantes, al ir el agua avanzando entre las partículas del subsuelo se filtran y dispersan y también son neutralizadas, oxidadas, reducidas o sufren otros procesos
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CONTAMINACION DE AGUAS
DEMANDA BIOQUIMICA DE OXIGENO DBO : la demanda bioquímica de
oxígeno (dbo)
es
un
parámetro
que
mide
la
cantidad
de dioxígeno dioxígeno consumido consumido al degradar la materia orgánica de una muestra líquida.
DEMANDA TOTAL DE OXÍGENO, DTO: medida cuantitativa de todo el material oxidable en una muestra de agua o de aguas residuales que se determina instrumentalmente midiendo el agotamiento del oxígeno
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CONTAMINACION DE AGUAS
13) CONSECUENCIAS La contaminación del agua representa un problema existencial en el mundo, ya que se trata de una de las principales fuentes de vida del planeta. Entre las múltiples consecuencias derivadas de la contaminación que el hombre propone al agua de lagos, ríos y mares, podemos destacar:
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CONTAMINACION DE AGUAS
porinfecciones por ingerir alimentos contaminados por bacterias, virus, hongos o sustancias tóxicas, como plomo arsénico o hierro.
15 ) MEDIDAS PARA EVITAR LA L A CONTAMINACIÓN DEL AGUA
Evitar pérdidas en las cañerías y en el sanitario. Usar detergentes biodegradables. No dejar grifos abiertos sin necesidad. No tirar basura a la la playa playa ni a los cursos cursos de agua. Usar desperdiciar petróleo.
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CONTAMINACION DE AGUAS
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CONTAMINACION DE AGUAS
1.- El agua se capta en su estado natural para su tratamiento. En el caso de Huaraz esta fuente la constituye el río Paria, en el caso de Caraz el río Llullán, en el caso de Chiquián el río Canal Tucu y en el caso de Aija el río Santiago. 2.- Luego el agua llega hasta el desarenador , donde la arena se separa
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CONTAMINACION DE AGUAS
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CONTAMINACION DE AGUAS
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CONTAMINACION DE AGUAS
Separando los residuos de las aguas residuales del pez, desintoxicándolo de las
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CONTAMINACION DE AGUAS
Recuperación de lodos, aceites y grasas para el procesamiento de harina
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CONTAMINACION DE AGUAS
transporte o cierre de minas, así como campamentos, sistemas de
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