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Separation method and system for multivalent ions in wastewater

A technology of multivalent ion and separation method, applied in the field of multivalent ion separation in wastewater

Active Publication Date: 2021-12-03
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of how to improve the separation rate of multivalent ions in the solution containing monovalent and multivalent ions, and provide a separation method and system for multivalent ions in waste water, which can improve the separation of monovalent and multivalent ions. Separation rate of multivalent ions in wastewater of multivalent ions

Method used

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  • Separation method and system for multivalent ions in wastewater
  • Separation method and system for multivalent ions in wastewater
  • Separation method and system for multivalent ions in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Raw water (see Table 1 for composition) was introduced image 3 The nanofiltration separation is carried out in the three-stage nanofiltration separation system shown.

[0062] The conditions for the first-stage nanofiltration separation are: pressure 1.1MPa, temperature 25°C, water production rate 30%;

[0063] The conditions for the second-stage nanofiltration separation are: the weight ratio of raw water: third-stage product water: first-stage concentrated water is 2:1:1; the pressure is 1.2MPa, the temperature is 25°C, and the water production rate is 30%;

[0064] The conditions for the third-stage nanofiltration separation are: pressure 1.3MPa, temperature 25°C, water production rate 30%.

[0065] The first stage of product water is rich in monovalent ions, and the third stage of concentrated water is rich in divalent ions. The separation results are shown in Table 1.

Embodiment 2

[0067] Raw water (see Table 1 for composition) was introduced Figure 4 Nanofiltration separation is carried out in the six-stage nanofiltration separation system shown

[0068] The conditions for the first-stage nanofiltration separation are: pressure 1.0MPa, temperature 25°C, water production rate 50%;

[0069] The conditions for the second-stage nanofiltration separation are: the weight ratio of the third-stage product water to the first-stage concentrated water is 0.5:1; the pressure is 1.1MPa, the temperature is 25°C, and the water production rate is 50%;

[0070] The conditions for the third-stage nanofiltration separation are: the weight ratio of the fourth-stage product water to the second-stage concentrated water is 0.8:1; the pressure is 1.15MPa, the temperature is 25°C, and the water production rate is 50%;

[0071] The conditions for the fourth-stage nanofiltration separation are: raw water: fourth-stage product water: third-stage concentrated water, the weight ra...

Embodiment 3

[0076] According to the method of Example 1, the difference is that the water production rate of each stage is 75%.

[0077] The separation results are shown in Table 1.

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Abstract

The invention relates to the field of separation of multivalent ions in waste water, and discloses a separation method and system for multivalent ions in waste water. The method includes: separating the raw water containing monovalent ions and multivalent ions by n-stage nanofiltration to obtain product water rich in monovalent ions and concentrated water rich in multivalent ions; wherein, in each stage of nanofiltration During the separation process, the influent water of this stage containing the adjacent product water and / or adjacent concentrated water obtained by the adjacent stage nanofiltration separation is subjected to nanofiltration separation to obtain the product water and concentrated water of this stage, and finally the first stage The first-stage product water obtained by stage nanofiltration separation is the product water rich in monovalent ions, and the n-stage concentrated water obtained by n-stage nanofiltration separation is the concentrated water rich in multivalent ions; wherein, The raw water is added to one of the influents selected from the second to n-1 stages of nanofiltration separation; wherein n is a positive integer of 3 or more. Achieve improved separation of divalent ions.

Description

technical field [0001] The invention relates to the field of separation of multivalent ions in waste water, in particular to a method and system for separation of multivalent ions in waste water. Background technique [0002] In chemical industry, environmental engineering, metallurgical engineering and many other industrial fields, it is of great significance to study the efficient concentration and separation of multivalent ions in aqueous solutions containing multivalent ions. Most power plants and coal chemical plants in my country use limestone wet desulfurization technology to remove SO from flue gas. 2 , the desulfurization wastewater generated during operation has become one of the most difficult wastewater for coal-fired power plants due to its complex composition and many types of pollutants [0003] At present, the chemical precipitation method (commonly known as triple box precipitation) is mainly used in China to treat desulfurization wastewater. The treated wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44B01D61/02
CPCB01D61/027C02F1/442
Inventor 钟振成李国涛熊日华程子洪陈权段亚威霍卫东李永龙卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD