What Is a Desalter?

Phenomenon of soluble salt content in farmland soil gradually decreasing. The soil salt content allowed for normal crop growth is called the "soil desalination standard." Improved saline-alkali soil can be combined with agricultural measures through irrigation and drainage-based water conservation measures, so that the soil salt content in the root layer of the crop can be gradually reduced to meet the desalination standard. ^[1]

The first step is to use ion exchange membrane technology to exchange cations in seawater into ammonium ions through a cation membrane and exchange anions in seawater to carbonate ions through an anion membrane. At this time, the salt in seawater is converted into carbonate that can be volatile and precipitated. Ammonium; in the second step, ammonium carbonate is precipitated by evaporation under reduced pressure and / or catalytic decomposition to indirectly achieve desalting.

The operating pressure of the latter-effect evaporator and the boiling point of the solution are lower than those of the former-effect evaporator by using a reduced pressure method, so that the secondary steam from the former-effect evaporator is used as heating steam of the latter-effect evaporator, The heating chamber of the latter effect evaporator becomes the

"Infiltration" in

With the rapid development of science and technology, pressure-driven reverse osmosis membrane separation technology (RO) has made great innovations and improvements in membranes, membrane stackers, equipment and processes, but people are increasingly aware that RO technology is 2. Limitations in the field of environmental protection, and in terms of desalination, RO technology can be considered to have reached the peak of development. Therefore, in recent years, foreign countries have carried out relevant research on "forward osmosis membrane separation technology (FO)" and have achieved certain results. They have been applied in the fields of seawater desalination, sewage treatment, food processing, medicine, etc. "Pressure-delayed penetration (FRO) seawater power generation" is even more promising as a clean and renewable energy development technology. However, little attention has been paid to forward osmosis membrane separation technology in China, and there are not many related studies and papers. Although, in the 1990s in China, there was a creative invention of "non-pressurized adsorption and infiltration seawater desalination" (CN92110710.2).

Forward osmosis separation technology has been applied very early. For a long time, people have used salt to store food for a long time, because most bacteria, molds and pathogens will dehydrate or temporarily lose their activity due to osmosis in high-salt environments. Nowadays, people have begun to use forward osmosis membrane separation technology for seawater desalination , industrial wastewater treatment, waste permeate treatment, etc .; the food industry uses forward osmosis membrane separation to concentrate drinks in the laboratory; Fresh water is produced by forward osmosis membrane separation technology. Recently, with the development of materials science, forward osmosis technology has been applied to the controlled release of drugs in the human body.