Calcium removing method of wastewater

A technology for wastewater and calcium salts, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. less effect

Active Publication Date: 2013-12-11
ENN ENVIROTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method can treat wastewater with high calcium content. However, the addition of various chemicals not only increases the treatment cost, but also the lime milk will cause the pH value of the water to rise, and the pH of the effluent needs to be adjusted by adding acid. Cause secondary pollution; in addition, adding lime milk will also increase solid waste (CaCO 3 ) output
[0004] Nanofiltration, reverse osmosis, electrodialysis and other methods all use selective membrane materials, which have the disadvantages of difficult membrane regeneration, complicated process, cleaning with chemicals, and high cost. They are only suitable for the removal of low-concentration hardness ions

Method used

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Embodiment approach

[0021] For better illustrating the present invention, facilitate understanding technical scheme of the present invention, typical but non-limiting implementation of the present invention is as follows:

[0022] In a typical implementation of the present invention, a method for decalcifying waste water is provided. The method introduces gas into the waste water in the form of aeration, and the CO in the waste water 2 The gas is taken away, and the calcium ions in the wastewater are crystallized in the form of solid calcium salts.

[0023] The above-mentioned technical scheme of the present invention does not need to add any chemical agent, does not cause secondary pollution, and has a simple process. The invention changes the chemical balance in the water body through aeration, and utilizes the hydraulic change in the water body caused by the aeration to promote the rapid and massive formation of calcium carbonate. Except that the calcium contained in the water itself is preci...

specific Embodiment 1

[0037] Sewage produced by a factory, total hardness = 1237.5mg / L, Ca 2+ =1045.4mg / L, the sewage temperature is 56°C.

[0038] In the decalcification process, the aeration volume is 10 times of the influent water volume, and the aeration is uniform; the waste water is in countercurrent contact with the gas, and the angle between the water flow direction and the air flow direction is 90°; the pH value of the sewage is adjusted to 8.5 by aeration ~9.

[0039] After the calcium removal treatment described in the present invention, the total hardness of sewage is reduced to 719.4mg / L, Ca 2+ Concentration dropped to 515.5mg / L.

specific Embodiment 2

[0040] Wastewater produced by a factory, total hardness = 1643.99mg / L, Ca 2+ =1583.2mg / L, the wastewater temperature is 38°C.

[0041] During the decalcification process, the aeration volume is 200 times of the influent water volume, and the aeration is uniform; the wastewater is in countercurrent contact with the gas, and the angle between the water flow direction and the airflow direction is 180°; the pH value of the wastewater is adjusted to 8.7-9.1 by aeration.

[0042] After the decalcification treatment of the present invention, the total hardness of wastewater is reduced to 170.4mg / L, Ca 2+ The concentration dropped to 74.3mg / L.

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Abstract

The invention relates to a calcium removing method of wastewater. The method comprises the following steps: charging gas into wastewater by an aeration method to take CO2 gas away from the wastewater; and crystallizing and separating calcium ions out of the wastewater in form of solid calcium salt. According to the technical scheme, the calcium removing method of the wastewater does not need any chemical agent, so that secondary pollution can be avoided; only calcium contained in the water mass is separated out, and additional precipitate is avoided.

Description

technical field [0001] The invention relates to the technical field of removing hardness from wastewater, in particular to a method for removing calcium ions in wastewater by aeration. Background technique [0002] Hardness will cause problems such as scaling in the process of water treatment and water use, which seriously affects life and industrial production. Excessive hardness will also affect the sewage treatment process. Therefore, removing hardness ions in water is the fundamental way to solve scaling, improve water treatment effect, and purify water quality. Various technologies such as chemical precipitation, nanofiltration, reverse osmosis, and electrodialysis can be used for water softening, but each treatment technology has its limitations. [0003] The chemical precipitation method mainly includes lime softening method and its combination process, such as lime / soda softening method, lime / soda / phosphoric acid softening method, etc. This type of method can trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/00
Inventor 李伟闫东杰贾永强李立敏王丽梅冯功源贾立庄
Owner ENN ENVIROTECH CO LTD
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