Water pollution

Water pollution - WATER POLLUTION Sewage Manufacturing...

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WATER POLLUTION Effects of Water Pollution: Water pollution has many effects on the environment whilst some are clearly visible (e.g. visual impact of an oil spill) others are less visible but equally devastating – e.g. pollution of drinking water / pollution of a lake. Some examples of water pollution include: Bacteria breaks sewage down into ammonia – but uses up oxygen from the water (reducing oxygen levels available for water life) Ammonia may also then be broken down into nitrates – lead to eutrophication. (see notes opposite) Nitrates from fertilizers and pesticides get washed into rivers and lakes – causing eutrophication. (see notes opposite) High nitrate levels in drinking water are a health hazard – limits of 50mg/litre have been set by the EU (costly to treat water supplies) Sewage In MEDC’s sewage is taken to treatment works and the treated sewage is then discharged into rivers, lakes and seas. Some old treatment works are inefficient and raw sewage leaks can occur –
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Water pollution - WATER POLLUTION Sewage Manufacturing...

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