1. Pre treatment: mainly involves removing organic matter, suspended solids, colloids, hardness, and residual chlorine from water to ensure the normal operation of RO. The processing technology adopts multi-media filtration, activated carbon adsorption, resin exchange of calcium and magnesium ions and related chemicals to reduce the production of scale, algae growth, microbial pollution and oxidants during RO operation.

2. The pre-treatment system includes: raw water tank, raw water pump, dosing system, multi-media filtration, activated carbon filtration, softener, and security filter.

3. Reverse osmosis device: The reverse osmosis host is the heart part of the pre desalination project. The water treated by reverse osmosis can remove the vast majority of inorganic salts, microorganisms, etc. The rationality of design directly affects the investment cost of the project, the economic benefits of the entire system operation, the service life, and the reliability and simplicity of operation. All reverse osmosis membranes use advanced low-pressure composite membranes, with a single desalination rate of 99.8%. When the system design temperature is 20 ℃, considering factors such as changes in raw water quality and membrane service life, this system uses an 8-inch composite RO membrane installed in a stainless steel pressure vessel. Recovery rate: 50% to 75%, desalination rate: 98%. The recovery rate of the RO system is above 50% to 75%, and the desalination rate of the system is not less than 98%. In this project, taking into account factors such as equipment energy conservation, operating pressure, membrane filtration, membrane desalination rate, and effluent salt content, our company recommends using American companies such as Hyden, Dow, and Dongli GE、 Reverse osmosis membranes from brands such as Time Walton Huitong.

4. EDI device: The EDI electric desalination system is a new technology that combines the advantages of electrodialysis and ion exchange to overcome their shortcomings. The stable working state of the EDI electric desalination system effectively extends the service life of EDI and reduces the operating costs of users. Its working principle consists of three processes. Firstly, under the action of a direct current electric field, electrolytes in water undergo selective migration through an ion exchange membrane; The second is that the cation exchange resin exchanges ions with electrolytes in water, forming an "ion channel"; The third is the electrochemical regeneration of the exchange resin by H+and OH - generated by the polarization of water at the interface of the ion exchange resin.

5. Polishing mixed bed: Polishing mixed bed, also known as disposable mixed bed, is generally used at the end of the high-purity water production process to further improve the quality of the produced water. The polishing resin in the polishing mixed bed cannot be regenerated or reused, and the so-called polishing refers to the surface treatment of the resin.

technological process

The main desalination equipment of the system is a combination of secondary reverse osmosis, EDI device, and nuclear polishing mixed bed; The system has low operating costs and is easy to achieve automation. The reverse osmosis water treatment system has good economic efficiency. The characteristics of this process are advanced, mature, stable effluent quality, and stable system operation.