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Method for removing hardness by using exhaust gas CO2

A CO2, waste gas technology, applied in chemical instruments and methods, water softening, water/sewage treatment, etc., can solve the problems of inconvenient waste water treatment and reuse, difficult sedimentation of particulate matter, low treatment efficiency, etc., to reduce the floor space. , The effect of reducing acid consumption and improving treatment efficiency

Pending Publication Date: 2021-11-02
陕西金禹科技发展有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional hardness removal method brings sodium and other metal ions into the wastewater, which is inconvenient for subsequent wastewater treatment and reuse. At the same time, after the pH value is raised in the traditional hardness reduction process, hydrochloric acid is used to adjust the pH value of the wastewater to increase the pH value of the wastewater. consume
[0004] In the traditional method of hardness removal, the precipitated particles of calcium carbonate generated due to the reduction of hardness are fine, and the traditional natural sedimentation method is used for treatment. Not only the generated particles are not easy to settle, but the treatment efficiency is low and the effect is poor. It is also necessary to build a large causticization tank and corresponding sedimentation tanks

Method used

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  • Method for removing hardness by using exhaust gas CO2
  • Method for removing hardness by using exhaust gas CO2
  • Method for removing hardness by using exhaust gas CO2

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specific Embodiment approach 1

[0050] Such as figure 1 As shown, the original solution is transported from the original solution tank to the mixer (Venturi high-efficiency mixer) through the original solution pump, mixed with carbon dioxide waste gas, and then enters the dissolved gas reactor. The outlet of the device flows into the buffer tank, and is sent into the swirl settling high level tank through the buffer pump;

[0051] The fully reacted mixed liquid flows into the automatic backwash surface filter for solid-liquid separation, and the qualified clear liquid at the filter outlet enters the clear liquid tank.

[0052] The slurry produced by the swirl settling head tank (magnesium removal reactor, calcium removal reactor) and the automatic backwash surface filter is regularly discharged into the slurry pool.

specific Embodiment approach 2

[0053] Such as figure 2 As shown, the calcium carbide slag emulsion from the system enters the carbide slag emulsion tank, enters the high-efficiency mixer through the carbide slag delivery pump, and at the same time, the wastewater from the circulation for hardness reduction enters the high-efficiency mixer through the booster pump, and the carbide slag emulsion and the circulation for hardness reduction The waste water is mixed into the pipeline mixer through a high-efficiency mixer. Two pipeline mixers are set in parallel and communicated with the magnesium removal reactor. One of the pipeline mixers is connected in series with the ferrous sulfate configuration system, and the solution passing through the pipeline mixer enters Ca(OH) in carbide slag solution in magnesium removal reactor 2 with Mg in circulating water 2+ After the chemical reaction is carried out to generate magnesium hydroxide, the supernatant of the magnesium removal reactor is collected into the buffer ...

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Abstract

The invention provides a method for removing hardness by using waste gas CO2. The method comprises the following steps: step 1, conveying a stock solution from a stock solution pool into a mixer through a stock solution pump, and mixing the stock solution with carbon dioxide waste gas; step 2, feeding the mixed solution in the step 1 into a dissolved gas reactor, enabling the carbon dioxide waste gas to fully react with calcium ions in the wastewater, enabling the mixed liquid to automatically flow into a buffer tank through an outlet of the dissolved gas reactor, and feeding the mixed liquid into a rotational flow sedimentation head tank through a buffer pump; step 3, enabling the fully reacted mixed liquid in the step 2 to automatically flow into an automatic backwashing surface filter for solid-liquid separation, and enabling qualified clear liquid at an outlet of the filter to enter a clear liquid tank; and 4, making the slag slurry generated by the rotational flow sedimentation head tank and the automatic backwashing surface filter in the step 2 and the step 3 discharged into a slag slurry pool at regular time. The pressurized dissolved gas reactor is utilized, so that carbon dioxide gas is better dissolved in liquid, effective and sufficient gas-liquid mixing is realized, the reaction efficiency is improved, and waste caused by gas overflow is reduced.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a waste gas CO 2 method of removing hardness. Background technique [0002] At present, the hardness salts in water include calcium, magnesium, iron, manganese, aluminum and other metal cations that are easy to form insoluble salts. In industrial wastewater, mainly calcium ions and magnesium ions, the degree of hardness of water is determined by "hardness" to measure. The existing traditional methods for removing hardness in China are: heating and softening method: the hardness of bicarbonate is converted into calcium carbonate and magnesium hydroxide with low solubility and precipitated by heating, but the permanent hardness cannot be softened by heating. Ion exchange softening method: Based on the principle of ion exchange, the cations (sodium ions, hydrogen ions) of some ion exchangers are used for exchange reactions with calcium and magnesium in water, and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F5/06C02F1/66C02F1/001C02F1/24C02F1/5236C02F2209/06
Inventor 王延军
Owner 陕西金禹科技发展有限公司
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