A process and system for indirect seawater, and other contaminated waters, electrolysis are provided. The system includes a pressure retarded osmosis unit including a semipermeable membrane, and a high pressure electrolyzer unit including an anode and a cathode, with an osmotic agent solution being circulated at high pressure between the draw side of the pressure retarded osmosis unit and the electrolyzer unit. The osmotic agent solution is diluted in the PRO unit as molecular water is drawn into it from the feed solution side through the semipermeable PRO membrane, and it is concentrated in the electrolyzer unit as molecular water is removed by electrolysis. The PRO process supplies the electrolyzer with the required molecular water for electrolysis and maintains a high pressure of the electrolyzer feed.

A system and method for seawater desalination based on solar energy. In the system, the second reaction tank is connected with the first reaction tank via a cation-selective nano-film and includes the same volume and concentration of seawater as the first reaction tank. The pump is connected the second reaction tank with the third reaction tank to pump the seawater solution after the removal of cationic salts from the second tank into the third tank. The fourth reaction tank is connected to the third reaction tank via a anion-selective nano-film. The third and fourth reaction tanks are connected through a second external channel and include the same volume and concentration of seawater, and the second external channel is provided with a third valve to control the flow of liquid. The fourth reaction tank is provided with a liquid output channel.

The present invention discloses an SWRO and MCDI coupled seawater desalination device system with energy recovery, including a pre-filtering unit, an SWRO treatment unit, an MCDI treatment unit, and a post-filtering unit. The SWRO treatment unit is coupled with the MCDI treatment unit. Seawater desalination is performed through a coupling complementary water passage and circuit design, while water quality is improved, and the continuity of water output from a water passage of the device is kept. By recovering the pressure potential energy of high-pressure brine in the SWRO treatment unit and electric energy released by desorption in the MCDI treatment unit, energy consumption is reduced.

A method of removing contaminants from a solution comprises passing a solution including one or more contaminants through a first cell comprising a first anode chamber and a first cathode chamber, passing a slurry comprising a flowing electrode material through the first anode chamber and the first cathode chamber while applying an electric potential between the first anode chamber and the first cathode chamber to transport anions from the solution to the first anode chamber and to transport cations from the solution to the first cathode chamber, the flowing electrode material comprising a MXene material, wherein M is a metal and X is one or both of carbon and nitrogen, and passing the slurry through a second cell to desorb the anions and cations from the flowing electrode material. Related systems for removing contaminants from a solution, and related methods are disclosed.

A desalination system includes a container for holding a reservoir of liquid salt Water, and an ultrasound transmitter for generating ultrasound Waves to generate an aerosol of saltwater particles at a surface of the reservoir of liquid sale Water. The aerosol is conveyed through a conduit having first and second side Walls, wherein the first and second side Walls are electrically conductive and oppositely charged, which separates electrically charged aerosolized particles from neutrally charged aerosolized particles. The neutrally charged aerosolized particles are then condensed after passing through the conduit to form a body of Water having a lower salinity than the reservoir of liquid saltwater.

Described herein is an ion pump system implementing an electronic ratchet mechanism produced by modulating a spatially varying electric potential distribution that can result in a net ionic current and voltage. The ion pumping membrane system includes an ion-permeable layer that can also be integrated with ion-selective membranes. The electric potential distribution within the ion-permeable layer is modulated through external stimuli. When immersed in solution, ions within the ion-permeable layer experience a time varying, spatially asymmetric electric field distribution resulting in ratchet-driven direct ion pumping, which can be used in applications such as desalination.

A membrane stack comprising the following components: (a) a first ion diluting compartment (D1); (b) a second ion diluting compartment (D2); (c) a first ion concentrating compartment (C1); (d) a second ion concentrating compartment (C2); and (e) a membrane wall (CEM1, mAEM, mCEM, AEM, CEM2) between each compartment and on the outside of the first and last compartment of the stack; wherein: (i) each membrane wall comprises a cation exchange membrane (CEM1, mCEM, CEM2) or an anion exchange membrane (mAEM, AEM) and the order of the cation and anion exchange membranes alternates from each wall to the next; (ii) the membrane walls (mAEM, mCEM) on each side of compartment (a) both have a higher monovalent ion selectivity than the corresponding membrane walls (AEM, CEM2) on each side of compartment (b); and (iii) the stack further comprises a means for communicating fluid between compartments (a) and (b).

A process that converts water into hydrogen, transports it and then reforms it into freshwater to irrigate land.

Disclosed are a water treatment apparatus including an anode, a cathode disposed to face the anode at a distance therefrom, and at least one electrochemical unit disposed at a distance from the anode and the cathode, respectively, wherein the electrochemical unit includes a layer having bipolarity when a voltage is applied between the anode and the cathode, and a water treatment method using the same.

A process for the work-up of salt-containing process water which contains an alkali metal chloride as salt in a concentration of at least 4% by weight and organic or inorganic and organic impurities from chemical production processes and reuse of the salt by a combination of prepurification and concentration, crystallization and purification of the salt and optionally subsequently use of the salt in an electrolysis for producing basic chemicals are described.