Demineralised DM Plant

A Demineralised DM Plant removes metal ions from water. Natural water contains ions called anions, such as chloride and sulphate, and cations, including iron, calcium, sodium, and copper. A DM plant is beneficial for many reasons, including preventing the oxidation of metals and the formation of scale on metal surfaces. The process involves a series of processes that eliminates ions.

DM plants are typically designed to remove mineral salts from water. DM plants can remove up to 30 ppm TDS at the outlet depending on the raw water TDS. The plant can also remove organic materials, such as sediments. A DM plant will reduce the overall cost of products produced by industrial manufacturing units. In addition to producing water of higher quality, a DM plant also lowers the cost of the finished product.

Uses of Demineralised DM Plant in Various Industry

The demineralised water produced by these plants is treated to make it safe in various industries. The main component of these plants is an IX column filled with resins. These resins have an ionic functional group, and the particles that stick to the resins are oppositely charged ions. This process is known as mutual electrostatic attraction and is used to treat wastewaters.

A typical DM plant comprises two pressure vessels with FRP/MS rubber-lined internal fittings. The first vessel contains a high-capacity, strongly acidic cation exchange resin that converts a positive ion into an acid. The second vessel absorbs the hydrogen ions and releases water free of contaminants. The pH level is 7.0, which is suitable for various industries.

A typical two-bed demineralised water plant consists of two pressure vessels, two FRP/MS rubber lines, and internal fittings. The first unit consists of a high-capacity, strongly acidic cation exchange resin. The ion-exchange resin reacts with the salt to produce hydrogen ions, which are then absorbed by the second vessel. The water from the first unit has a low dissolved solids content and is suitable for use in industries that require highly purified water.

How Demineralised DM Plant Work?

The process uses resins, which are composed of plastic beads that are negatively charged. The resins then attract opposite-charged ions. These counterions are then released, resulting in demineralized water production. Once the process has finished, the water is ready for use. It is important to note that the water produced by a DM plant is usually 30 parts per million TDS.


A typical demineralisation plant consists of two polyethylene filter tanks connected with a PVC pipe system. The demineralisation process begins by passing raw water, called fluent, through a cation resin bed. The Cation resin bed contains SAC resin in H form. As the raw water passes through the cation resin bed, the salts in the water are converted to their respective acids. The water then passes through an anion column to remove acid-containing anions in the next step. Then, the regenerate tank is backwashed with sodium hydroxide or acid-containing anions. This cycle is repeated as many times as necessary until the purified water is free of all impurities.

The Demineralisation Plant removes salts from raw water through ion exchange resin. These salts can cause problems during industrial processes, such as incrustations in steam generators. The Demineralisation plant uses a washing process to remove these salts, which produces clean, pure water.

Specification of DM Plant

A Technical Specification of Demineralised DM Plant is required to ensure water quality produced from the treatment process. The DM Plant produces water with a TDS of 30 ppm or below at the outlet, and this TDS depends on the TDS of the raw water. There are two main types of Demineralised DM plants, and one type uses a dual bed process to produce demineralised water suitable for reuse and other industrial uses.

A typical two-bed demineralised water plant comprises a series of pressure vessels with internal fittings. The first unit contains a large capacity of highly acidic cation exchange resin to convert positive ions in salt to hydrogen ions. The second unit absorbs the acids. Demineralised water from this plant has a high purity level and is suitable for acidic injections, waste-to-energy processes, and large power plants.

A typical two-bed demineralised water plant comprises FRP/MS Rubber-lined pressure vessels and internal fittings. The first unit contains a large capacity of strongly acidic cation exchange resin, and the resin reacts with the positive ions in the salt to form hydrogen ions. Then, the acidic cation exchange resin is absorbed in the second vessel in the second unit. The finished water from the two-bed demineralisation process contains low dissolved solids. A typical mixed-bed demineralisation plant is designed to produce high-purity treated water.