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Water Treatment Process in Industrial Purpose

Water for industrial purposes

Definition of  Water Treatment Conditioning :

Water Treatment conditioning is the process by which hard water, both temporary and permanent, is made soft  ( by total reduction or reducing the proportion of chemicals causing hardness) to be suitable for use as boiler feed water. Conditioning is necessary for maximum output of steam and for protecting the life of boiler bodies, tubes and pipes by prevention of scale formation and corrosion.

Various water conditioning processes are employed: precipitation water treatment processes, ion exchange water treatment processes, demineralisation water treatment process , phosphate condition-ing, etc.

More than 50 per cent of water in chemical industries is used for cooling. Before setting up an industrial plant at any place, the water supply arrangement is first looked into. The available water is also analysed to find out the degree of hardness.

RO water treatment

Besides cooling tower and boiler need water treatment processed  water is used as :

 Boiler Water Treatment Process

Water for raising steam in boilers must be soft and must not contain too much dissolved or suspended matter, so as to avoid the troubles of :

  1. Scale formation
  2. Corrosion  and
  3. Foaming.

(a)  Scale formation: The water must be soft, otherwise, a deposit of mainly CaCO3 and CaSO4, is formed on the walls of the boiler. The formation of this hard heat insulating crust, called boiler scale, causes a much greater consumption of fuel and  also a rapid deterioration of the boiler due to overheating. The life of the boiler is thus gre.any shortened. Under the stress of continued overheating tne boiler may give way and burst due to unequal expansion of the body of the boiler and scale.

 (b) Corrosion:  Continuous deposition of scales on the walls of the boilers causes corrosion, that is the material of the body is ccrroeed and damaged. The boiler body thus gets weaker and may burst.

(c) Foaming:  Too much of dissolved matter in boiler water causes foaming and frcthing. This prevents the formation and escape of steam. Magnesium chloride if present in water, is readily hydrolysed giving NCI, which attacks the body of the boiler made of iron, causing pitting and corrosion. Pitted zones are the vulnerable points in boilers. The boiler water must not therefore contain MgCl2, i.e., it must be soft. Sea water, cannot be used in marine boilers, since it contains too much of MgCl2.

 Laundry water  Treatment Process

Water used for laundering purpose must be soft. When hard water is treated with soap, the latter is removed from water as an insoluble precipitate and is not therefore available for detergenation until all the calcium and magnesium salts are removed, that is, until the hard water is softened.

When hard water is treated with a soap solution, the soluble   sodium stearate (sodium stearate representing the soap) reacts with the calcium, magnesium and iron salts present in hard water to yield insoluble slimy precipitates of the stearates of the minerals. Soap is thus removed from water:

2C17H35COONa+Ca++    —–>  (C17H35COO)2Ca+Na+
Sodium stearate                                          (Soluble Soap)

Hard water will not, therefore, form a lather with soap until st ff. cient qbantity of it has been added to precipitate all the calcium, magnesium and iron in the water as insoluble stearate.

Laundry water must also be free from iron, otherwise brown Fe(CH)3 would be deposited en the fabric and stain the same.

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4 Responses to “Water Treatment Process in Industrial Purpose”

  1. Bruck says:

    Your website is good and fantastic, great ideas and very professional.

  2. Barnegm says:

    keep it up with the great work.

  3. Solomons says:

    I love learning more on this topic of water treatment.

  4. Tiso says:

    Thank you for the new post. Pls write some water treatment process in sewage treatment systems. Also give video clip for plant operation.

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