What is cold and hot lime soda process?

1- Hot lime soda process is carried out at high temperature (95-100°C) ,whereas cold lime soda process is carried out at room temperature (25-30°C). 2- Hot lime soda is a rapid process, but cold lime soda is slow process. 3-No coagulant is required here, in cold lime soda process coagulant is necessary.

What is Clarks process?

Cold lime softening, also known as Clark’s 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).

Why is hot lime soda process is better than cold lime soda process?

Hot lime soda requires hardly 15 mins. Hence it is more economical while cold process requires several hours. Dissolved gases like O2,CO2 are removed. Due to high temperature, bacterial contents are minimum.

What is cold lime soda?

[′kōld ¦līm ¦sō·də ‚präs·əs] (chemical engineering) A water-softening process in which water is treated with hydrated lime (sometimes in combination with soda ash), which reacts with dissolved calcium and magnesium compounds to form precipitates that can be removed as sludge.

What is Calgon process?

Calgon’s process is used in chemistry to get complex anion. Calgon is used for ionizing in order to get complex anion. This is used in the removal of calcium and magnesium ions from the hard water in the form of a complex calgon.

How do you remove carbonates from water?

Chemical precipitation is one of the more common methods used to soften water. Chemicals normally used are lime (calcium hydroxide, Ca(OH)2) and soda ash (sodium carbonate, Na2CO3). Lime is used to remove chemicals that cause carbonate hardness.

How does lime soda treatment remove permanent hardness?

In this process, the hardness is removed by sedimentation as calcium carbonate or magnesium hydroxide. Lime is added either as calcium hydroxide or calcium oxide, and soda is added as sodium carbonate. The substances form hardness in water and the reactions of lime and soda can be written as follows.

What are the advantages of hot lime soda process?

Advantages of Lime-Soda Process :

• it is very economical.
• if this process is combined with sedimentation with coagulation, lesser amounts of coagulants shall be needed.
• The process increases the pH value of the treated-water; thereby corrosion of the distribution pipes is reduced.