Drinking Water Treatment – Flocculation.
Now that the particles have a neutral charge and can stick together.
The water flows into a tank with paddles that provide slow mixing and bring the small particles together to form larger particles called flocs.
Mixing is done quite slowly and gently in the flocculation step.
How does flocculation purify water?
Flocculation is gentle stirring or agitation to encourage the particles thus formed to agglomerate into masses large enough to settle or be filtered from solution. To separate the dissolved and suspended particles from the water coagulation and flocculation processes are used.
What is flocculation and why is it important for clean water?
At a water treatment center, flocculants are used to help floating particles (total suspended solids) combine so that they are weighted down and settle to the bottomthe bottom where they can be removed. As particles are removed, water that was turbid (not clear) becomes clear.
What is the purpose of flocculation?
Flocculation: A process wherein colloids come out of suspension in the form of floc, either spontaneously or due to the addition of a clarifying agent. It is used in applications like water purification, sewage treatment, cheese production and brewing, for example.
What does coagulation do to water?
Drinking Water Treatment – Coagulation. In coagulation, we add a chemical such as alum which produces positive charges to neutralize the negative charges on the particles. Then the particles can stick together, forming larger particles which are more easily removed.
What chemicals are used for flocculation?
The aluminum coagulants include aluminum sulfate, aluminum chloride and sodium aluminate. The iron coagulants include ferric sulfate, ferrous sulfate, ferric chloride and ferric chloride sulfate. Other chemicals used as coagulants include hydrated lime and magnesium carbonate.
What chemicals are used to clean water?
The following chemicals are used to purify the water :
- Chlorine either as gas or by adding Sodium hypochlorite to the water.
- Potassium permangnate, till the water becomes light pink.
- Ozone. Its effect is short-lived.
- Bromin, The treatment is called Bromination (not recommended)
- Mixture of Chlorine and ammonia.