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Post treatment for desalinated and soft water for balanced water composition supply

A salt water and seawater technology, applied in water/sewage treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problems of not being able to provide naturally, not meeting the proportion requirements, not being provided in water, etc.

Inactive Publication Date: 2010-01-20
TECHNION RES & DEV FOUND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned earlier, using figure 1 The method shown does not satisfy Ca 2+ ratio requirement with alkalinity, which is the reason for using CO-based 2 A fact of the calcite dissolution method
[0010] Another significant disadvantage of these two calcite dissolution methods is that they do not provide Mg to the water 2+ ion
Although the current Israeli quality standards do not mention Mg 2+ ions, however, desalinated water contains Mg 2+ Ions are beneficial for agriculture and human health
Post-processing using calcite dissolution does not naturally provide Mg 2+ ion

Method used

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  • Post treatment for desalinated and soft water for balanced water composition supply
  • Post treatment for desalinated and soft water for balanced water composition supply
  • Post treatment for desalinated and soft water for balanced water composition supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

Embodiment 1 (operation under continuous mode)

[0057] Water quality requirements for post-treatment process outlets

Alkalinity>90mg / L CaCO 3

120>[Ca 2+ ]≥80mg / L CaCO 3

[Mg 2+ ]=24.3mg / L Mg 2+

CCPP≥3.0mg / L CaCO 3

pH=<8.5

General design

[0058] The chemicals that need to be added to the water as it passes through the calcite reactor are (assuming only 25% of the water passes through the calcite reactor, the chemical added per cubic meter of water represents 25% of these values):

h 2 SO 4 (100%)=487mg / L (pH reaches 2.06)

CaCO 3(s) =760mg / L

[0059] According to the existing calcite dissolution method, this water flow should be combined with 75% untreated water and added NaOH to obtain a pH value of about 7.8 to obtain the following results: Alkalinity = 92.5mg / L CaCO 3 , [Ca 2+ ]=190mg / L CaCO 3 , CCPP=3.2mg / L CaCO 3 (NaOH required in this hypothetical case is 21.4 mg / L).

[0060] In the method that the present invention proposes, the water quality...

Embodiment 2

Embodiment 2 (multi-column operation)

[0066] Water quality requirements for post-treatment process outlets

Alkalinity≥65mg / L CaCO 3

120>[Ca 2+ ]≥80mg / L CaCO 3

[Mg 2+ ]=12.15mg / L

CCPP≥2.0mg / L CaCO 3

pH<8.5

General design

[0067] The chemicals that need to be added to the water as it passes through the calcite reactor are (assuming only 25% of the water passes through the calcite reactor, the chemical added to the entire water flow represents a quarter of the dosage stated in this article):

h 2 SO 4 (100%)=316mg / L (pH reaches 2.24)

CaCO 3(s) =525mg / L

[0068] According to the existing calcite dissolution method, this water flow should be combined with 75% untreated water and added NaOH to obtain a pH value of about 8.2 to obtain the following results: Alkalinity = 66mg / L CaCO 3 , [Ca 2+ ]=132mg / L CaCO 3 , CCPP=3.0mg / L CaCO 3 (NaOH dosage required in this case is 12.3 mg / L).

[0069] In the method that the present invention proposes, the water (its...

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PUM

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Abstract

An H2S04-based calcite dissolution post-treatment process and apparatii for desalinated water are provided. The process comprises separating cations from seawater by ion exchange resin (s) (12) onto which the ions are loaded, contacting the ion exchange resin (s) (12) loaded with the cations with an effluent (1) of a calcite dissolution reactor (10) wherein the cations are exchanged with Ca2+ from this effluent. The Ca2+ concentration of the resulting desalinated water (6) decreases while the cations concentration increases to comply with required quality criteria. Batch type and continuous apparatii by which the process can be carried out are described.

Description

technical field [0001] The present invention relates to demineralized and softened water. More specifically, the present invention relates to post-treatment of demineralized and demineralized water for providing a balanced water composition. Background technique [0002] Desalination of seawater and brackish water is gaining increasing attention worldwide. It is expected that the proportion of desalinated water in total water consumption in many countries will increase significantly in the near future. There are two types of desalination methods in the industry: reverse osmosis (RO) technology and electrodialysis technology. Both types of methods produce water with very low dissolved solids content. Many places also have naturally soft water. In order to improve the quality of these water resources, they need to be treated (demineralized water is treated after the membrane separation step, and the technical term is called "post-treatment"). Water low in dissolved substa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/42C02F1/44C02F1/66C02F1/68
CPCC02F1/66C02F2301/043C02F1/42C02F1/68C02F2103/08C02F1/441Y02A20/131C02F1/4604C02F1/4618C02F2001/425
Inventor 奥里·拉哈乌利亚特·伯恩哈克马勒卡·科丘瓦罗尼·佩恩
Owner TECHNION RES & DEV FOUND LTD
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