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Method for mineralizing seawater desalted water

A technology of carbon dioxide and reaction, applied in the field of water treatment, to facilitate production, reduce the Larson coefficient, and ensure the quality of water delivery

Inactive Publication Date: 2013-01-30
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no large-scale use of seawater desalinated water as domestic water and relevant experience

Method used

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  • Method for mineralizing seawater desalted water
  • Method for mineralizing seawater desalted water
  • Method for mineralizing seawater desalted water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for mineralizing seawater desalinated water, the specific steps are as follows:

[0029] ⑴ Set the temperature of the constant temperature water bath to 5℃, and use a peristaltic pump to pump the water in the water bath into the reactor jacket to circulate;

[0030] (2) Take 1.5L of seawater desalination water into the reactor, when the temperature of the desalinated water reaches 5℃, weigh 0.75g of limestone into the reactor. Open CO 2 Pressure reducing valve, CO 2 The flow rate is set to 19mL / min, and CO is passed into the reactor 2 ;

[0031] ⑶ Turn on the stirrer, set the stirring frequency to 250r / min, and start timing. When the reaction reaches 20min, stop stirring and stop CO 2 , Take out the solution in the reactor and filter with a vacuum pump to obtain a clear liquid;

[0032] ⑷Inject a small amount of sodium hydroxide to adjust the pH to 7.5, the seawater desalination water is mineralized, and the mineralized seawater desalination water is obtained.

[0033]...

Embodiment 2

[0054] A method for mineralizing seawater desalinated water, the specific steps are as follows:

[0055] ⑴ Set the temperature of the constant temperature water bath to 5℃, and use a peristaltic pump to pump the water in the water bath into the reactor jacket to circulate;

[0056] (2) Take 1.5L of seawater desalination water into the reactor, when the temperature of the desalinated water reaches 22°C, weigh 1g of limestone and add it to the reactor. Open CO 2 Pressure reducing valve, CO 2 The flow rate is set to 19mL / min, and CO is passed into the reactor 2 ;

[0057] ⑶ Turn on the stirrer, set the stirring frequency to 300r / min, and start timing. When the reaction reaches 15min, stop stirring and stop CO 2 , Take out the solution in the reactor and filter with a vacuum pump to obtain a clear liquid;

[0058] ⑷Inject a small amount of calcium hydroxide to adjust the pH to 8, and the mineralization of the desalinated water is completed, and the mineralized desalinated water is obtain...

Embodiment 3

[0079] A method for mineralizing seawater desalinated water, the specific steps are as follows:

[0080] ⑴ Set the temperature of the constant temperature water bath to 5℃, and use a peristaltic pump to pump the water in the water bath into the reactor jacket to circulate;

[0081] (2) Take 1.5L of seawater desalinated water into the reactor, when the desalinated water temperature reaches 5℃, weigh 1.25g of limestone into the reactor. Open CO 2 Pressure reducing valve, CO 2 The flow rate is set to 19mL / min, and CO is passed into the reactor 2 ;

[0082] ⑶ Turn on the stirrer, set the stirring frequency to 150r / min, and start timing. When the reaction reaches 10min, stop stirring and stop CO 2 , Take out the solution in the reactor and filter with a vacuum pump to obtain a clear liquid;

[0083] ⑷Inject a small amount of calcium hydroxide to adjust the pH to 8, and the mineralization of the desalinated water is completed, and the mineralized desalinated water is obtained.

[0084] Inde...

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Abstract

The invention relates to a method for mineralizing seawater desalted water, which comprises the following steps: keeping constant temperature on the seawater desalted water, adding limestone, introducing CO2 and stirring, performing pumping filtration on a reaction solution after completing the reaction to obtain a clarification liquid, and adjusting the pH value to 7.5-8.5 to obtain the mineralized seawater desalted water. The mineralization method is used for mineralizing the seawater desalted water, a method is employed for dissolving the limestone ore, the hardness of the seawater desalted water is increased; carbon dioxide is used for promoting the dissolution of the limestone, the hardness of the seawater desalted water is increased; thereby the prepared seawater desalted water increases the total alkalinity, the total hardness and pH value of the water body. LSI saturation index can be finally enhanced, and the purpose for reducing Larson coefficient is reduced. the hardness of the seawater desalted water is high, and the seawater desalted water contains mineral matters Ca<2+> and Mg<2+> required by human body, the stability of the water quality is good, and the water quality can satisfy the requirements of biochemical criterion, erosion performance and corrosivity of the drinking water.

Description

Technical field [0001] The invention belongs to the field of water treatment, and relates to a seawater desalination water treatment method, in particular to a seawater desalination water mineralization method. Background technique [0002] Desalination of seawater is the main way to solve the crisis of freshwater resources. Several desalination plants have been built and put into operation in China, but the current desalinated water has low hardness and lacks the essential mineral Ca. 2+ And Mg 2+ At the same time, the stability of water quality is poor, and it is highly corrosive and corrosive, which will have corrosive effects on metal water pipelines, especially when the original municipal water supply pipeline network is used for seawater desalination water transportation. The existing corrosives will dissolve in the water due to drastic changes in water quality, resulting in "red water" phenomenon and water supply accidents. Therefore, if the existing urban water supply pip...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F103/08
Inventor 唐娜张蕾程鹏高弓家谦何国华
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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