A process for boron removal from feed water. The process includes the steps of introducing a stream of feed water with sodium borate salt or calcium borate salt therein to an ion exchange vessel containing boron-selective resin modified with potassium sulfate or sodium sulfate. The feed water is reacted with the boron-selective resin modified with sodium sulfate or potassium sulfate. The ion exchange resin in the ion exchange vessel is periodically regenerated.

Provided is a water softening device including a water softening tank that softens raw water using a weakly acidic cation exchange resin, a pH adjustment tank, an electrolytic cell that produces acidic electrolyzed water, a conductivity measurement unit S.sub.1 that measures conductivity of the raw water, a conductivity measurement unit S.sub.2 that measures conductivity of soft water, a water flow amount detecting unit, and a control unit, wherein the control unit calculates a regeneration time for the weakly acidic cation exchange resin based on an amount of the hardness component adsorbed to the weakly acidic cation exchange resin calculated from a difference between the conductivity of the raw water and the conductivity of the soft water and from the accumulated water flow amount of the raw water, and performs a regeneration treatment of the weakly acidic cation exchange resin during the regeneration time.

The present invention relates to a method for identifying the unit causing a raw water leak in a condenser of a thermal power plant consisting of n units.

The present invention relates to a method for identifying the unit causing a raw water leak in a condenser of a thermal power plant consisting of n units.

A sustainable system for removing and concentrating per- and polyfluoroalkyl substances (PFAS) from water. The system includes an anion exchange vessel having a selected anion exchange resin therein configured to remove PFAS from the water. A line coupled to the vessel introduces a flow of water contaminated with PFAS such that the PFAS bind to the selected anion exchange resin and are thereby removed from the water. A regenerant solution line is coupled to the anion exchange vessel to introduce an optimized regenerant solution to the anion exchange vessel to remove the PFAS from the anion exchange resin, thereby regenerating the anion exchange resin and generating a spent regenerant solution comprised of the removed PFAS and the optimized regenerant solution. A separation and recovery subsystem recovers the optimized regenerant solution for reuse and separates and concentrates the removed PFAS.

A sustainable system for removing and concentrating per- and polyfluoroalkyl substances (PFAS) from water. The system includes an anion exchange vessel having a selected anion exchange resin therein configured to remove PFAS from the water. A line coupled to the vessel introduces a flow of water contaminated with PFAS such that the PFAS bind to the selected anion exchange resin and are thereby removed from the water. A regenerant solution line is coupled to the anion exchange vessel to introduce an optimized regenerant solution to the anion exchange vessel to remove the PFAS from the anion exchange resin, thereby regenerating the anion exchange resin and generating a spent regenerant solution comprised of the removed PFAS and the optimized regenerant solution. A separation and recovery subsystem recovers the optimized regenerant solution for reuse and separates and concentrates the removed PFAS.

A method for producing an ion exchange resin. The method comprises steps of: (a) providing a basic ion exchange resin in the acidic form which comprises amino polyol groups and has a volume % swell from 15 to 30% upon conversion from the basic form to the acidic form, and (b) washing the resin with water or aqueous acid.

A method as described herein may include contacting a fluid with a single resin to cause the single resin to bond to nitrates and perchlorates contained in the fluid. The method may regenerate the single resin by a regeneration process comprising contacting the single resin with a salt solution, wherein regenerating removes a substantial portion of the nitrates contained within the single resin but does not remove a substantial portion of the perchlorates contained within the single resin, wherein the single resin comprises a nitrate-specific resin and does not comprise a perchlorate-specific resin.

A method as described herein may include contacting a fluid with a single resin to cause the single resin to bond to nitrates and perchlorates contained in the fluid. The method may regenerate the single resin by a regeneration process comprising contacting the single resin with a salt solution, wherein regenerating removes a substantial portion of the nitrates contained within the single resin but does not remove a substantial portion of the perchlorates contained within the single resin, wherein the single resin comprises a nitrate-specific resin and does not comprise a perchlorate-specific resin.

A system and method for generating water concentrated in calcium bromide from produced water, to provide for drilling fluid having the calcium bromide. The technique includes flowing the produced water through a bed of ion-exchange resin to sorb bromide ions from the produced water onto the ion-exchange resin, and then regenerating the ion-exchange resin to desorb the bromide ions for combination with calcium ions to acquire an aqueous solution with calcium and bromide.