What is the desalination process of the intelligent desalination equipment-Ocpuritech-img

What is the desalination process of the intelligent desalination equipment?

by:Ocpuritech     2021-04-01
What is the desalination process of the intelligent desalination equipment? Author: Reverse osmosis technology is the most advanced and most energy efficient membrane separation technology. The principle is that under the action of higher than the osmotic pressure of the solution, other substances cannot pass through the semi-permeable membrane and these substances and moisture are removed. Reverse osmosis technology is usually used for sea water, brackish water and fresh water. So what is the desalination process of the smart seawater desalination equipment? 1. Seawater pretreatment: Whether it is desalination or desalination of brackish water, feedwater pretreatment is the key to ensuring the long-term stable operation of the reverse osmosis system. When formulating a seawater desalination pretreatment plan, full consideration should be given to the existence of a large number of microorganisms, bacteria and algae in the seawater. The proliferation of bacteria and algae and the growth of microorganisms in seawater will not only bring a lot of trouble to water intake facilities, but also directly affect the normal operation of seawater desalination equipment and process pipelines. Periodic high tides and low tides, large amounts of silt entrained in seawater, and large changes in turbidity can easily cause unstable operation of the seawater pretreatment system. Seawater is highly corrosive, and the materials of equipment, valves, and pipe fittings used in the system must be screened to a certain extent, and the corrosion resistance should be good. 2. Seawater sterilization and algae: In seawater desalination projects abroad, chemical reagents such as liquid chlorine, NaClO and CuSO4 are used to sterilize and kill algae. Taking into account various factors such as traffic, it is difficult to add chemical reagents to sterilize and kill algae. In the development process of this project equipment, a seawater sodium hypochlorite generator is specially used. After the seawater intake pump, a small stream of pressurized seawater is separated into the sodium hypochlorite generator, and NaClO is produced under the action of a direct current electric field, which is directly injected into the caisson on the beach to kill bacteria, algae and microorganisms in the seawater. Due to the high hardness of seawater, the direct electrolysis of seawater to produce NaClO must overcome the problem of electrode fouling. In the development process, the electrodialysis frequent pole reversal (EDR) technology was used for reference, that is, the electrode polarity was reversed every 5 to 10 minutes, which effectively solved the problem of scaling and precipitation of the sodium hypochlorite generator. 3. Coagulation filtration: Coagulation filtration aims to remove colloidal and suspended impurities in seawater and reduce turbidity. In the reverse osmosis membrane separation project, the pollution index (FI) is usually used to measure, and the FI value of the feed water entering the reverse osmosis equipment is required to be <4. Due to the large proportion of seawater, high pH value, and large seasonal changes in water temperature, the system uses FeCl3 as the coagulant, which has the advantages of being unaffected by temperature, large and firm alum blooms, and fast settling speed. 4. Reverse osmosis seawater desalination: seawater has high salt content, high hardness, and is highly corrosive to equipment. It is extremely important to reduce project investment and energy consumption through careful process design and reasonable equipment configuration, thereby reducing the unit water cost and ensuring the stable operation of the system. The above is the introduction of the reverse osmosis seawater desalination treatment project. The reverse osmosis seawater desalination technology is developing rapidly, and the project cost and operating cost continue to decrease. The main development trend is to reduce the operating pressure of the reverse osmosis membrane and improve the recovery of the reverse osmosis system. Rate, low-cost and high-efficiency pretreatment technology, enhance the anti-pollution ability of the system, etc.
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