Method for treating wastewater containing hypochlorite

A technology of hypochlorite and calcium hypochlorite, which is applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of no reduction in wastewater discharge and no recovery of sodium chloride components , complex production process and other issues, to achieve the effect of inhibiting hydrolysis, avoiding excessive hydrolysis and improving flocculation effect

Inactive Publication Date: 2016-04-20
郑宏伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The secondary mother liquor is mixed with other organic-containing wastewater, and the organic matter is oxidized and decomposed by the available chlorine component to reduce the COD content in the wastewater. not recycled
[0027] Although the hydrochloric acid pickling waste liquid produced by hot-dip galvanizing enterprises contains a large amount of ferrous chloride, there is still a certain amount of hydrochloric acid and impurities in the waste liquid. If you want to produce standard-grade ferric chloride, the production process is relatively difficult. The above is complicated, and this kind of production also has certain environmental risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Add the pickling waste liquid to the secondary mother liquor of bleaching powder, and mix the pickling waste liquid and the secondary mother liquor of bleaching powder according to the mass ratio of 1:10. During the stirring process, the temperature is controlled at 0°C, and the stirring time is for 1 hour. The gas generated during the stirring process is treated by the tail gas absorption device. In the tail gas absorption device, sodium hydroxide solution is used to absorb the chlorine gas in the tail gas to generate a solution containing sodium hypochlorite. The sodium hypochlorite solution is recovered and used to produce bleaching powder. The pickling waste liquid and the secondary mother liquor of bleaching powder are mixed to form polyferric chloride, and the polyferric chloride solution is obtained. The main components of the solution are water, sodium chloride, polyferric chloride, calcium chloride, and a small amount of hypochlorite Acid ion, sodium chloride a...

Embodiment 2

[0109] Add the secondary mother liquor of bleaching powder essence to the pickling waste liquid. The mass ratio of pickling waste liquid and bleaching powder essence secondary mother liquor is 8:3, and stir while adding. During the stirring process, the temperature is controlled at 100°C, and the stirring time is for 1 minute. The gas generated during the stirring process is treated by the tail gas absorption device. In the tail gas absorption device, the chlorine gas in the tail gas is absorbed by the lime milk suspension to generate a solution containing calcium hypochlorite. The calcium hypochlorite solution is recovered and used for the production of bleaching powder. After the pickling waste liquid and the secondary mother liquor of bleaching powder are mixed to generate polyferric chloride, the obtained polyferric chloride solution is mainly composed of water, sodium chloride, polyferric chloride, calcium chloride, and a small amount of secondary Chlorate ion, sodium chl...

Embodiment 3

[0121] Calcium aluminate is added into the pickling waste liquid according to the mass ratio of 1:10 and stirred evenly, then the pickling waste liquid is added to the secondary mother liquor of bleaching powder, and the mass ratio of the pickling waste liquid and the secondary mother liquor of bleaching powder is 1:1 ratio, stirring while adding, the temperature is controlled at 50°C during the stirring process, and the stirring time is 30 minutes. The gas generated during the stirring process is treated by the tail gas absorption device. In the tail gas absorption device, sodium hydroxide solution is used to absorb the chlorine gas in the tail gas to generate a solution containing sodium hypochlorite. The sodium hypochlorite solution is recovered and used to produce bleaching powder. After the pickling waste liquid and the secondary mother liquor of bleaching powder are mixed to generate polyaluminum ferric chloride, the obtained polyaluminum ferric chloride solution is mainl...

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PUM

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Abstract

The invention relates to a method for treating wastewater containing hypochlorite, and belongs to the technical field of wastewater treatment. In the method, after pickle liquor and wastewater containing hypochlorite are mixed, a polymeric ferric salt solution is prepared. According to the method for treating wastewater containing hypochlorite by use of the polymeric ferric salt solution, provided by the invention, the pickle liquor treatment and the treatment of the wastewater containing hypochlorite are combined to generate the polymeric ferric salt solution through a reaction, chlorine gas generated through the reaction is absorbed through tail gas to generate calcium hypochlorite or sodium hypochlorite to be recycled, or the chlorine gas is collected and recycled after being treated through a gas cleaning device.

Description

technical field [0001] The invention relates to a method for treating wastewater containing hypochlorite, and belongs to the technical field of wastewater treatment methods. Background technique [0002] Calcium hypochlorite, commonly known as bleaching essence, is often used in the bleaching process in chemical production. It plays an important role in industrial production because of its rapid onset and outstanding bleaching effect. [0003] Bleaching powder essence is a high-efficiency bleaching disinfectant developed as a substitute for bleaching powder, with calcium hypochlorite as the main component. The available chlorine content reaches 55%-70% (mass fraction), while the available chlorine content of bleaching powder can only reach 28%-32%. Bleaching powder has a series of advantages such as high available chlorine content, good stability, fast dissolution speed, and convenient transportation and storage. It is widely used in the bleaching of fabrics and pulp, and t...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F101/12
CPCC02F1/5236C02F2101/12
Inventor 郑宏伟
Owner 郑宏伟
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