Water Contamination: Managing Suspended Solids and Colloids
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Understanding Water Contamination by Solids
The presence of various solids in water is a primary factor in pollution. These contaminants must be eliminated to prevent significant operational issues, including:
- Pipe obstruction
- Pump abrasion
- Material wear
These factors directly impact maintenance and operational costs. The particle size of contaminants in water varies widely.
Separating Suspended Solids
Some solids are large enough to be seen with the naked eye. When left in suspension at rest, these can be separated through:
- Settling: Under the influence of gravity.
- Flotation: Depending on the relative densities of the solid and water.
- Filtration: A common method for physical separation.
Managing Colloidal Particles
Other very fine particles, known as colloids, exhibit high stability in water. These particles range in size between 0.001 and 1 μm and are a major cause of water turbidity.
Due to their extreme stability, colloids cannot be separated by settling or flotation, and they are too small to be removed by standard filtration methods.