What is cold lime soda process?

Cold lime softening process is used to reduce raw water hardness, alkalinity, silica, and other constituents. The water is treated with lime or a combination of lime and soda ash (carbonate ion). These chemicals react with the hardness and natural alkalinity in the water to form insoluble compounds.

What is lime soda treatment process?

Lime softening (also known as lime buttering, lime-soda treatment, or Clark’s process) is a type of water treatment used for water softening, which uses the addition of limewater (calcium hydroxide) to remove hardness (deposits of calcium and magnesium salts) by precipitation.

What are the advantages of hot lime soda process of softening the hard water?

Advantages of Lime-Soda Process : The process increases the pH value of the treated-water; thereby corrosion of the distribution pipes is reduced. Besides the removal of hardness, the quantity of minerals in the water is reduced. To certain extent, iron and manganese are also removed from the water.

Which coagulants is used in cold lime soda process?

Use of sodium aluminate as coagulant also helps the removal of silica as well as oil, if present in water. Cold L-S process provides water, containing a residual hardness of 50 to 60 ppm.

Why are no coagulants used in hot lime soda process?

Coagulant is necessary because at room temperature precipitate is finally divided. But do not settle easily & cannot easily filtered. i) Reactions take place faster. ii) Less amount of coagulant is required.

What is the use of lime and soda in lime soda process?

Soda lime is a process used in water treatment to remove Hardness from water. This process is now obsolete but was very useful for the treatment of large volumes of hard water. Addition of lime (CaO) and soda (Na2CO3) to the hard water precipitates calcium as the carbonate, and magnesium as its hydroxide.

What is a hot lime softener?

Hot Lime Softeners (Cone Bottom Spheres) Playing an integral role in the water recovery process during SAGD Oil Sands projects, Hot Lime Softeners reduce the amounts of oxygen, carbon dioxide, silica, hardness, trace oil, and other suspended solids in water destined for use as boiler feed water.

Which coagulant is used in cold lime soda process?

Alum, aluminium sulphate and sodium aluminate are used as coagulants in lime-soda process.