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ZERO-ION Demineralizers


The resin beds must be periodically regenerated to restore them to the original ionic form (An ion is an atom or group of atoms with an electric charge. Positively charged ions are called cations and negatively-charged ions are called anions). Regeneration is achieved by passing a base and/or acid solution through the resin beds. This removes the positive and negative ions (cations and anions, respectively) trapped by the resins in order to allow a new cycle of ion exchange.

The cation resin is regenerated with hydrochloric acid (HCl). HCl during regeneration splits into H+ ions and Cl- ions. The H+ ions react with the cationic resins. The anion resin is regenerated with sodium hydroxide-caustic soda (NaOH). NaOH splits into Na+ and OH- ions. The OH- ions react with the anionic resins.

The demineralizer (DM) plant can be regenerated in series (cation followed by anion) or in parallel (cation and anion simultaneously). Besides, anion resin must have the hardness removed from the influent water to prevent hardness fouling.

After regeneration, the resins will have to be rinsed to remove the excess regenerants


MORF INDIA also offers a full range of degassers as a post-fit to the cation unit of the DM plant. The cation exchangers convert alkalinity present in raw water to its equivalent acid. ie., carbonic acid. A degasser also known as decarbonator is used in conjunction with ion exchange units for mechanical removal of CO2. Degassers are installed downstream of the cation units and thereby reduces the acidic load on the anion unit. This results in cost savings by way of reduced chemical consumption.

A degasser unit essentially consists of a tower (MSRL/FRP) with integral tank, an air blower and a water pump with necessary piping and valves to connect this system to the CA unit. The tower portion is packed with PVC Pall Rings. The air blower is connected by air ducting to the tower just above the tank portion. Additional pumps and blowers are offered as options depending on the applications.

Electrodeionization Systems (EDI)

Electrodeionization (EDI) is a time-tested electrically driven membrane demineralization process used to refine industrial process water. EDI is used for applications which require ultrapure water. This technology provides key advantages over traditional ion-exchange processes. Electrodeionization Systems remove ions from aqueous streams typically as a post-fit to RO and DM plants. Our high-quality deionization modules continually produce ultrapure water up to 18.2MW/cm. EDI may be run continuously or intermittently.

EDI operates on the principle of migration of charged ions across a semi-permeable membrane which contains charged resin beds. The migration of membranes is initiated by applying current, by means of cathode and anode. Feedwater flows in a thin sheet between ion exchange membranes through the stack where a DC electrical field is present. This generates the migration of ions across the oppositely charged membranes. The oppositely charged ions permeate through the charged membranes and collect in the concentrate chamber. A constant flow is maintained in the concentrate chamber to continuously evacuate the ions into the reject stream.

The ultra pure water from the pure water chamber flows out continuously. The reject water is not wasted and is recycled back to the pre-treatment sections.

EDI uses high-capacity ion exchange membranes which not only removes residual salts but also ionizible aqueous substances like CO2, silica, ammonia and boron..

EDI units are used in power generation, microelectronics, food and beverage production, chemical and pharmaceutical factories. EDI helps in eliminating expensive and hazardous chemicals used in ion-exchange resin regeneration. EDI increases the product recovery rates, reduces operating expenses and gives consistent treated water quality. With a smaller footprint, EDI helps companies meet their ISO 14000 requirements.

Correctly configured and properly operated EDI plants produce water which contains less than 5 ppb silica and measures 16-18 megohm-cm. The primary advantages of using EDI are superior quality water, elimination of expensive and hazardous chemicals, stable and continuous performance and reduction in facility size requirements.