Ultrapure water preparation method

Abstract

The invention discloses an ultrapure water preparation method, relating to the technical field of ultrapure water preparation. The method comprises the following steps: firstly, introducing a non-oxidizing bactericide into tap water in a raw water pool to form sterilized water, afterwards, treating the sterilized water to obtain pure water, storing the pure water in a water tank, then enabling thepure water to be subjected to ultraviolet sterilization and filtration, sending the pure water into an electric desalination device to form desalted water, and finally treating the desalted water toobtain ultrapure water. Compared with the prior art, the ultrapure water preparation method provided by the invention adopts the steps of enabling the pure water to be subjected to the ultraviolet sterilization and the filtration and sending the pure water into the electric desalination device to form the desalted water, so that the dosage of the non-oxidizing bactericide can be reduced, the quality of the pure water which enters an electric desalination system is improved, the service life of the electric desalination system is prolonged, and the operating cost is reduced.

Description

technical field [0001] The invention relates to the technical field of ultrapure water preparation, in particular to a method for preparing ultrapure water. Background technique [0002] At present, in the production and manufacture of glass substrates, pure water is required in the grinding process, and ultrapure water is required in the cleaning process. Ultrapure water, also known as UP water, refers to water with a resistivity of 18MΩ·cm at 25°C. Except for water molecules, there are almost no impurities in this water, and there are no organic substances such as bacteria, viruses, and chlorinated dioxins. Of course, there is no mineral trace element needed by the human body, that is, water that almost removes all atoms except oxygen and hydrogen. Ultrapure water can be used to prepare various ultrapure materials. [0003] The current production process for preparing ultra-pure water starts to sterilize when the sand filter enters the water. During the operation, it is f...

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Problems solved by technology

[0003] The current production process for preparing ultra-pure water starts to sterilize when the sand filter enters the water. During the operation, it is found that there are more bacteria in the pure water system and the back-end. The agent is expensive, resulting in an increase in cost; and the current process is that pure water directly enters the EDS system, which will lead to a rapid decline in the water quality of the EDS system, reduce its service life, and increase operating costs

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