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What chemicals are used in coagulation?

Traditional chemical coagulation uses aluminum and iron coagulants. The most common aluminum coagulants are aluminum sulfate, aluminum chloride, and sodium aluminate. Iron coagulants include ferric sulfate, ferrous sulfate, ferric chloride, and ferric chloride sulfate [4].

What is the most common coagulant?

Aluminum sulfate

Which of the following is a coagulant?

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 is formed when coagulant is added to water?

Common Coagulant: When coagulant is dissolved in water and thoroughly mixed initially a thick gelatinous precipitate, known as floc is formed . The aluminum and ferric ions of the floc contains positive charge .

Why is alum added to the water?

Aluminum sulfate, called alum, when added to lake water removes phosphates through precipitation, forming a heavier than water particulate known as a floc. This floc then settles to the lake bottom to create a barrier that retards sediment phosphorus release.

Why is lime added to water?

Lime softening is a water treatment process that uses calcium hydroxide, or limewater, to soften water by removing calcium and magnesium ions. In this process, hydrated lime is added to the water to raise its pH level and precipitate the ions that cause hardness.

Why is caco3 added in the treatment of water?

Currently calcium carbonate is used to neutralize acidic conditions in both soil and water.

Does lime make water hard?

Scientists measure the hardness of water using a pH scale, which measures the hydrogen-ion concentration in the liquid. If you have an aquarium, certain types of fish will die in hard water. And a buildup of alkaline deposits (aka lime deposits) can damage plumbing and appliances like washing machines and dishwashers.