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Special medicament for removing hardness ions in underground water and application thereof

A technology for hardness ions and groundwater, which is applied in the direction of water softening, etc., can solve the problems of high operation technology requirements, incomplete reaction, high pretreatment requirements, etc., and achieve good treatment effects, good application prospects, and low cost.

Active Publication Date: 2013-10-23
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional processes for the removal of total hardness in drinking water are mainly chemical precipitation, ion exchange, reverse osmosis, and nanofiltration. Among them, ion exchange, reverse osmosis, and nanofiltration usually require coagulation, precipitation, and filtration of raw water before treatment. Add microfiltration and other means for pretreatment and then enter into nanofiltration or reverse osmosis membrane. Although the water quality after treatment is good and stable, but the required supporting facilities have high requirements for pretreatment, long process, expensive equipment and high operating costs. Due to defects such as high technical requirements for operation and high energy consumption, it is difficult to popularize and use it on a large scale in some rural areas and remote mountainous areas; chemical precipitation methods include lime softening, soda softening, caustic soda softening, etc., although they can effectively reduce groundwater Calcium and magnesium ion content, but there are generally problems such as slow reaction speed, incomplete reaction, and significant increase in effluent pH

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Special agents for removing hardness ions in groundwater, including sodium hydroxide, powdered kaolin, and polyaluminum chloride with a weight ratio of 8:0.5:1.5.

[0017] The kaolin has a particle size of 0.5μm or less, and the sodium hydroxide is food grade sodium hydroxide.

[0018] Treating groundwater with an initial total hardness of 480mg / L and pH of 7.75 with the above-mentioned agents includes the following steps:

[0019] (1) Put the special medicine into the flowing groundwater, the dosage of the medicine is 80mg / L groundwater, and the special medicine and the groundwater are fully mixed evenly under the promotion of the groundwater;

[0020] (2) The groundwater mixed with the special medicine is directly filtered by the filter device, and the effluent is the groundwater with the hardness ions removed, which can be directly supplied to the user after disinfection.

[0021] After treatment, the total hardness of groundwater is reduced to 260mg / L, while the turbidity of ...

Embodiment 2

[0023] A special agent for removing hardness ions in groundwater, including sodium hydroxide, powdered kaolin, and polyaluminum chloride in a weight ratio of 9:0.3:0.7.

[0024] The kaolin has a particle size of 0.01-0.1μm, and the sodium hydroxide is food grade sodium hydroxide.

[0025] Treating groundwater with an initial total hardness of 480mg / L and pH of 7.75 with the above-mentioned agents includes the following steps:

[0026] (1) Put the special medicine into the flowing groundwater, the dosage of the medicine is 70mg / L groundwater, and the special medicine and the groundwater are fully mixed evenly under the promotion of the groundwater;

[0027] (2) The groundwater mixed with the special medicine is directly filtered by the filter device, and the effluent is the groundwater with the hardness ions removed, which can be directly supplied to the user after disinfection.

[0028] After treatment, the total hardness of groundwater is reduced to 240mg / L, while the turbidity of the ...

Embodiment 3

[0030] A special agent for removing hardness ions in groundwater, including sodium hydroxide, powdered kaolin, and polyaluminum chloride with a weight ratio of 8.4:0.5:1.2.

[0031] The particle size of kaolin is below 0.4μm, and sodium hydroxide is food grade sodium hydroxide.

[0032] Treat groundwater with an initial total hardness of 480mg / L and a pH of 7.75 with the above-mentioned agents. The method is as in Example 1. The dosage of the agent is 100mg / L of groundwater; the total hardness of the groundwater after treatment is reduced to 250mg / L and treated at the same time The turbidity of the effluent is 0.3-0.5NTU, and the pH value is stable between 7.80-8.35.

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PUM

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Abstract

The invention provides a special medicament for removing hardness ions in underground water. The medicament comprises sodium hydroxide, powdery kaolin and polyaluminum chloride. A preparation method for the special medicament has the advantages of easiness, wide sources of raw materials and low cost; the special medicament is safe to use, can realize rapid and highly efficient precipitation of calcium carbonate and magnesium hydroxide sediments, has a fast treatment speed and a good treatment effect in treatment of hardness ions in underground water and has good application prospects.

Description

Technical field [0001] The invention relates to a special agent for removing hardness ions in groundwater, and also relates to the application of the agent. Background technique [0002] Too high or too low water hardness will affect our human health, and it will also bring inconvenience to daily life. For example, when washing with hard water, it will react with soap to produce insoluble precipitates. In addition to affecting the washing effect, it will also make the clothes fibers hard and brittle and easily damaged. When washing the hair with hard water, it will become astringent. The current "Sanitary Standard for Drinking Water" (GB5749-2006) stipulates that the total hardness content in drinking water should be less than 450mg / L (with CaCO 3 meter). [0003] The conventional processes for the removal of total hardness in drinking water are mainly chemical precipitation, ion exchange, reverse osmosis, and nanofiltration. Among them, ion exchange, reverse osmosis and nanofiltr...

Claims

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Application Information

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IPC IPC(8): C02F5/02
Inventor 刘成陈卫张程胡伟
Owner HOHAI UNIV
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