Qualitative_Hydrobiology-1

Qualitative_Hydrobiology-1 - Water pollution When toxic...

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W ater pollution When toxic substances enter lakes, streams, rivers, oceans, and other water bodies, they get dissolved or lie suspended in water or get deposited on the bed. This results in the pollution of water whereby the quality of the water deteriorates, affecting aquatic ecosystems. Pollutants can also seep down and affect the groundwater deposits. Globally, water pollution has many sources. Among the worst sources of pollution in developing nations are city sewage and industrial wastes that are discharged directly into rivers. The facilities to treat waste water in many nations are highly inadequate. For example, in India (containing approximately 20% of the global human population), only about 10% of the waste water generated is actually treated. The rest is discharged untreated into bodies of water. As a result, pollutants enter groundwater, rivers, and other water bodies. Such water, which can ultimately end up in household water supplies, is often highly contaminated and carries disease-causing microbes. Agricultural run-off, or the water from the fields that drains into rivers, is another major water pollutant as it contains fertilizers and pesticides. Domestic sewage refers to waste water that is discarded from households. Also referred to as sanitary sewage, such water contains a wide variety of dissolved and suspended impurities. It amounts to a very small fraction of the sewage by weight. But it is large by volume and contains impurities such as organic materials and plant nutrients that tend to rot. The main organic materials are food and vegetable waste, plant nutrient come from chemical soaps, washing powders, etc. Domestic sewage is also very likely to contain
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Qualitative_Hydrobiology-1 - Water pollution When toxic...

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