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Method and system for preparing drinking weak base water and strontium-rich electrolyte raw material water from salt-making distilled water

An electrolyte, strontium-rich technology, used in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of inability to drink directly, affecting the taste of water, and high pH

Active Publication Date: 2019-12-13
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, although salt-making distilled water belongs to distilled water to a certain extent, sodium ions are inevitably brought in during the evaporation process, and its concentration is usually greater than 50ppm or even higher, which will affect the taste of water
In addition, the distilled water obtained in the salt making process is alkaline water, whose pH is too high to drink directly

Method used

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  • Method and system for preparing drinking weak base water and strontium-rich electrolyte raw material water from salt-making distilled water
  • Method and system for preparing drinking weak base water and strontium-rich electrolyte raw material water from salt-making distilled water
  • Method and system for preparing drinking weak base water and strontium-rich electrolyte raw material water from salt-making distilled water

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The distilled water for salt production is obtained from the industrialized five-effect evaporation salt production system of Sichuan Zigong Chiyu Salt Products Co., Ltd. After ICP analysis, the main ion content of each effect condensate is shown in Table 1. The ion content of different effects is different, but gradually increases from the first effect to the fifth effect. Among them, the sodium ion content is 0.6-60 ppm, the calcium ion content is 2-13 ppm, and the strontium ion content is 0.02-1 ppm. It can be seen that the salt-making distilled water can be used as the raw water for preparing drinking water, but according to its source, ion enrichment or regulation needs to be carried out to meet the standard requirements.

[0063] Table 1 Main ion content of five-effect evaporation salt-making distilled water

[0064]

Embodiment 2

[0065] Example 2: Removal of residual hydrogen sulfide in distilled water for salt production

[0066] Get the distilled water of the first effect to the fifth effect in the embodiment 1, measure the distilled water sulfide of the first effect to the fifth effect according to the assay method of the sulfide content in the national standard GB 8538-2016 "Drinking Natural Mineral Water Inspection Method" The content of the material was 0.01ppm, 0.02ppm, 0.04ppm, 0.05ppm and 0.05ppm, respectively. The above-mentioned distilled water was treated by vacuum suction filtration at room temperature (about 25° C.), the pressure was 1 kPa, and the residence time was 30 minutes. After the treatment was completed, the sulfide content in the water sample was measured. The sulfide content of the distilled water is less than 0.01ppm, which meets the national standard requirements for sulfide content in drinking water.

Embodiment 3

[0067] Example 3: The effect of primary filtration on ion content

[0068] Microfiltration was selected as the primary filtration, and the microfiltration membrane used was the TORAY microfiltration membrane produced by a Japanese company. The water samples containing 100ppm sodium ions, 20ppm calcium ions and 1ppm strontium ions were continuously subjected to microfiltration membrane filtration treatment at room temperature (about 25°C), the pressure was 0.15MPa, and the membrane flux was natural flux (that is, no control of the flow rate). quantity). The ion content of the filtered water sample was measured by ICP, and the measured sodium ion content was 102 ppm, the calcium ion content was 19.5 ppm, and the strontium ion content was 0.96 ppm. It can be seen that the use of microfiltration membrane for one filtration treatment will basically not cause the reduction of ion content.

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Abstract

The invention provides a method for preparing drinking weak base water and strontium-rich electrolyte raw material water from distilled water obtained in the process of producing salt from well mine brine. The method comprises the following steps: sequentially carrying out decompression treatment, primary filtration, membrane separation treatment, activated carbon adsorption treatment, secondary filtration treatment, sterilization and disinfection treatment and the like on salt-making distilled water. According to the method, the weak base water suitable for drinking, and the strontium-rich electrolyte raw material water which can be used for functional beverage production can be prepared through removing of insoluble solid impurities, sulfides, microorganisms and other substances in the raw material water, and separating or enriching of ions. According to the method provided by the invention, comprehensive utilization of resources can be realized, a new product can be obtained, and the economical efficiency of the process is remarkably improved.

Description

technical field [0001] The invention relates to the field of food, in particular to a method and system for preparing drinking weak alkaline water and strontium-rich electrolyte raw material water prepared from the by-product distilled water obtained in the process of preparing salt from mine brine. Background technique [0002] Table salt, also known as table salt, is one of the most important substances for human survival and the most commonly used seasoning in cooking. The main component of table salt is sodium chloride. There are two types of salt: coarse salt and refined salt. Coarse salt can be obtained from seawater, aqueous solution of mineral salt, salt juice from salt wells, salt water from salt ponds, etc. by drying, filtering, steaming, and crystallization. Refined salt is obtained by recrystallizing crude salt and chemically removing impurities such as sulfate and sodium carbonate of alkali metals and alkaline earth metals. Whether it is the preparation of cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F9/10
CPCC02F9/00C02F2301/063C02F1/001C02F1/44C02F1/283C02F2301/08C02F2303/04C02F2303/02C02F1/06C02F1/444C02F1/442C02F1/441C02F2209/02C02F2209/03C02F2209/44C02F1/78C02F1/32C02F1/004C02F1/70C02F2301/06B01D61/58
Inventor 赵雪冰刘德华周自圆戴玲妹邹成华
Owner TSINGHUA UNIV
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