Seawater electrofiltration desalting method and device

Abstract

The invention relates to seawater desalting method and device, in particular to aseawater electrofiltration desalting method and device. The desalting method is characterized in that seawater flows in a pipeline formed by an electrofiltration anode plate, an electrofiltration cathode plate and a shell; and after the electrofiltration plates are electrified, the seawater desalting is completed. The desalting device is provided with a water guide pipeline, and is characterized in that the electrofiltration anode plate and the electrofiltration cathode plate are arranged in the pipeline; the electrofiltration anode plate and the electrofiltration cathode plate are respectively connected with the anode and the cathode of a power supply; the water guide pipeline is in a spiral shape; and the distance of the electrofiltration anode plate and the electrofiltration cathode plate in the pipeline is the same. After the electrofiltration anode plate and the electrofiltration cathode plate are respectively connected with the anode and the cathode of the power supply, when seawater enters the pipeline at a certain flow speed, cations in the seawater gather towards the electrofiltration cathodeplate under the action of an electric field, and anions gather towards the electrofiltration anode plate. After the seawater desalting is completed, the cations and the anions flow out from a water outlet of the pipeline. After the electrofiltration anode plate and the electrofiltration cathode plate respectively disconnected with the power supply, salt ions on the electrofiltration plates are released, and washing is carried out, and strong brine is collected. The invention has the advantages of low energy consumption, high work efficiency, strong capability of being applicable to seawater quality and temperature, good desalting effect, convenient operation, long service and the like.

Description

technical field [0001] The invention relates to a seawater desalination method and device, in particular to a seawater electric filtration and desalination method and device with low desalination cost. Background technique [0002] As we all know, desalination technologies for different raw waters have developed rapidly in the past few decades. At present, there are dozens of seawater desalination methods, mainly distillation method, membrane method, freezing method, etc. Among them, the membrane method has become the fastest growing and most used method due to its advantages of energy saving, scale, strong adaptability and short construction period. Seawater desalination technology. For liquid separation membrane processes such as reverse osmosis, nanofiltration, ultrafiltration, microfiltration, and electrodialysis of existing membrane methods, membrane fouling and membrane performance degradation will inevitably occur, such as membrane surface fouling, microbial fouling...

AI Technical Summary

Problems solved by technology

However, there are many defects in these technologies, for example, ultrafiltration membrane elements are not suitable for treating heavily polluted water, and nanofiltration membrane elements cannot work under high water flux conditions.

Although high water feed rate can reduce concentration polarization, it will lead to increased power loss, frequent cleaning of the membrane, cumbersome process, and reduced membrane performance

Under normal circumstances, the working temperature of the membrane is around 15-28°C, and the seawater temperature in the north is generally around 3°C in winter, so the membrane cannot work normally, and increasing the seawater temperature by about 15°C requires huge energy consumption

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