describe lime soda process of softening of water giving diagram and reaction involved
Answers
Answer:
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Explanation:
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.
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In lime-soda process, hard water is treated with lime (CaO or Ca (OH)2) firstly, after that with soda. 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.
The usual method for lime soda processing is treatment by excessive lime amount. The pH should be greater than 9 for sedimentation of the magnesium hydroxide. Usually pH is between 10-10.5. The process contains lime dosing. A small amount of alum or sodium aluminate is added to ensure good sedimentation. The recycling of some sediment sludge can also help to sediment.
The usual method for lime soda processing is treatment by excessive lime amount. The pH should be greater than 9 for sedimentation of the magnesium hydroxide. Usually pH is between 10-10.5. The process contains lime dosing. A small amount of alum or sodium aluminate is added to ensure good sedimentation. The recycling of some sediment sludge can also help to sediment.If the water contains excessive alkalinity after the softening process has been completed, there is a possibility that the calcium carbonate will settle in the pipes. The softened water is treated with H2SO4 or CO2 to remove this from the softened water. This reaction is called recarbonization.