Preparation method of nano filtration drinking water based on seconddary membrane filtering technology

Abstract

A process based on two-stage membrane filter technique for preparing the nanofiltered water able to be directly drunk includes such steps as microfiltering the running water to obtain microfiltered water and the concentrated water to be recovered, nanofiltering to obtain nanofiltered water and the concentrated water to be recovered, decoloring and deodoring by chromatographic column to obtain the target water, and collecting said two kinds of concentrated water.

Description

Technical field [0001] The invention relates to a preparation method of direct drinking water, in particular to a nanofiltration direct drinking water preparation method based on secondary membrane filtration technology. Background technique [0002] With the increase of the population, the continuous expansion of the scope of people's activities, the development of industry and agriculture and the urbanization of population residence, a large amount of industrial production sewage, agricultural production sewage and people's domestic sewage are discharged into the environment, and water pollution problems have become more and more serious. Water is the basic material basis for people's survival. We must consume a certain amount of water every day. Therefore, drinking water pollution seriously threatens people's survival safety. In the face of increasingly serious water pollution, today, we have paid more and more attention to the safety of drinking water. At the same time, with ...

AI Technical Summary

Problems solved by technology

There are two problems with distilled water as drinking water. One is that in addition to consuming a lot of energy and high production costs when producing distilled water, it will also emit a lot of waste gas and pollute the environment.

The second is that distilled water is a kind of pure water that does not contain any minerals. People who drink this kind of pure water without minerals for a long time may lead to a lack of electrolytes in the human body, thus causing a series of diseases due to lack of electrolytes.

Drinking water produced by ion exchange method has the following problems: (1) the ion exchange resin itself for producing ion exchange water may have some water-soluble harmful substances residues, which will be brought into drinking water along with the production of drinking water, Cause the unsafeness of drinking water; (2) the resin regeneration when producing ion-exchanged water can produce a certain amount of waste water, pollute the environment; (3) ionized water is also a kind of pure water, does not contain any mineral matter, and people drink this kind of Pure water without minerals may lead to a lack of electrolytes in the human body, causing a series of diseases due to lack of electrolytes

However, the current nanofiltration water production methods and equipment exist because the raw material water has not passed effective pretreatment before entering the nanofiltration system, resulting in overloading of the nanofiltration equipment, many cleaning times of the nanofiltration membrane, short gap time and water production. low rate and other disadvantages

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