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Desalination treatment method for reverse osmosis concentrated water

A reverse osmosis concentrated water and treatment method technology, applied in the field of sewage treatment, can solve the problems of acid-base waste liquid, polarization scaling, and complicated operation, so as to reduce scaling ability and corrosion ability, realize recycling, The effect of cheap and easy-to-obtain raw materials

Active Publication Date: 2021-11-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrodialysis equipment has many components and requires high assembly requirements; and electrodialysis is prone to polarization scaling and neutral disturbance phenomena. Once scaling will cause a significant drop in desalination efficiency, it needs to be cleaned with acid and alkali in time or replaced
Although the above methods have a high desalination rate, they all have disadvantages such as complicated operation, high cost, cumbersome equipment maintenance, and generation of acid-base waste liquid.
[0005]In the existing research, there are also some methods of using special chemicals to treat concentrated water. Although this type of method is relatively simple to operate and does not require the use of complicated equipment, but Generally, there is the problem of low desalination efficiency, especially the poor removal effect of chloride ions, which is not widely popularized, and the concentrated water after treatment is difficult to meet the qualified recovery standard.

Method used

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  • Desalination treatment method for reverse osmosis concentrated water
  • Desalination treatment method for reverse osmosis concentrated water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The concentrated water sample 1 in table 1 is processed as follows:

[0056] (1) Add calcium oxide and sodium metaaluminate to reverse osmosis concentrated water (the molar ratio of calcium oxide, sodium metaaluminate and sulfate ions in the solution is 8:2:1), and stir at 25°C Reaction 120min, suspension is filtered, obtains the filtrate that removes sulfate ion;

[0057] (2) Continue to add calcium oxide and sodium metaaluminate to the filtrate (the molar ratio of calcium oxide, sodium metaaluminate and chloride ions in the solution is 6:2:1), and stir for 120 minutes at 25°C , the suspension is filtered to obtain the filtrate for removing chloride ions;

[0058] (3) Use an air pump to blow air into the filtrate for 2 hours to remove residual calcium and magnesium ions in the solution;

[0059] (4) Add activated clay to the solution according to the addition amount of 50g / L, stir and react for 2h, remove part of the sodium ions in the solution by ion exchange and ne...

Embodiment 2

[0061] The concentrated water sample 1 in table 1 is processed as follows:

[0062] (1) Add calcium hydroxide and sodium metaaluminate to reverse osmosis concentrated water (the molar ratio of calcium hydroxide, sodium metaaluminate and sulfate ions in the solution is 8:2:1), at 25°C , stirring and reacting for 80min, the suspension was filtered to obtain the filtrate for removing sulfate ions;

[0063] (2) Continue to add calcium hydroxide and sodium metaaluminate to the filtrate (the molar ratio of calcium hydroxide, sodium metaaluminate and chloride ions in the solution is 6:2:1), and stir at 25°C After reacting for 80min, the suspension was filtered to obtain the filtrate from which chloride ions were removed;

[0064] (3) Use an air pump to blow air into the filtrate for 3 hours to remove residual calcium and magnesium ions in the solution;

[0065] (4) Add activated clay to the solution according to the addition amount of 50g / L, stir and react for 2h, remove part of th...

Embodiment 3

[0067] The concentrated water sample 1 in table 1 is processed as follows:

[0068] (1) Add calcium oxide and sodium metaaluminate to reverse osmosis concentrated water (the molar ratio of calcium oxide, sodium metaaluminate and sulfate ions in the solution is 10:4:1), and stir at 35°C Reaction 40min, suspension is filtered, obtains the filtrate that removes sulfate ion;

[0069] (2) Continue to add calcium oxide and sodium metaaluminate to the filtrate (the molar ratio of calcium oxide, sodium metaaluminate and chloride ions in the solution is 8:4:1), and stir for 40 minutes at 35°C , the suspension is filtered to obtain the filtrate for removing chloride ions;

[0070] (3) Use an air pump to blow air into the filtrate for 4 hours to remove residual calcium and magnesium ions in the solution;

[0071] (4) Add activated clay to the solution according to the addition amount of 50g / L, stir and react for 2h, remove part of the sodium ions in the solution by ion exchange and neu...

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Abstract

The invention provides a desalination treatment method for reverse osmosis concentrated water, which comprises the steps of adding a calcium salt and sodium metaaluminate to concentrated water, carrying out a first mixing reaction, and carrying out solid-liquid separation to obtain a first filtrate; adding calcium salt and sodium metaaluminate into the first filtrate, carrying out a second mixing reaction, and carrying out solid-liquid separation to obtain a second filtrate; reacting the second filtrate with carbon dioxide to obtain suspension; and adding activated clay into the suspension, and carrying out solid-liquid separation to obtain desalted reverse osmosis concentrated water. According to the treatment method, the removal rate of calcium ions and magnesium ions in the reverse osmosis concentrated water can reach 99% or above, the removal rate of sulfate ions can reach 94% or above, the highest removal rate of chloride ions can reach 88% or above, and the scaling capacity and the corrosion capacity during recycling of the reverse osmosis concentrated water are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a desalination treatment method for concentrated reverse osmosis water. Background technique [0002] Reverse osmosis water treatment technology has been applied in many fields such as urban sewage, industrial concentrated water, pure water preparation, seawater desalination and so on by virtue of its advantages of low consumption, high efficiency and no pollution. an important technology. [0003] Reverse osmosis concentrated water refers to the concentrated water produced after the industrial pure water is prepared by the reverse osmosis system. Generally, the recovery rate of reverse osmosis concentrated water is 50%-80%, so a large amount of concentrated water will be produced while purifying water, and the discharged concentrated water contains high concentration of inorganic salts. Direct discharge of reverse osmosis concentrated water will not only w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
CPCC02F9/00C02F1/5236C02F1/66C02F1/42C02F2001/425C02F1/36C02F1/001Y02A20/131
Inventor 何治柯朱梦珂谭智友吉邢虎
Owner WUHAN UNIV
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