Study Session 4 Water Pollution



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water pollution

Types of water pollutant


There are many different types of water pollutant and the following sections describe those that are most commonly found.

Sediments and suspended solids


Sediments and suspended solids consist of fine particles of mostly inorganic material. Inorganic material is derived from non-living sources and includes mud, sand and silt washed into a river as a result of land cultivation, construction, demolition and mining operations, where these take place. One of the most common sources of suspended solids and sediment is soil erosion, where the soil is washed away into rivers by rainwater run-off. The presence of solid particulate material suspended in the flowing water is the reason why many rivers look brown in colour, especially in the rainy season. The particles are called suspended solids while they are carried (suspended) in flowing water and sediments when they settle to the bottom. Large quantities of suspended solids may reduce light penetration into the water, which can affect the growth of plants. Sediments may even suffocate organisms on the river bed.

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