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Method for adjusting pH value of alkaline waste water

A regulation method and wastewater technology, applied in separation methods, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of sewage treatment process difficulty, hindered sewage operation, highly toxic substances, etc., and achieve a favorable pH adjustment. , the effect of less risk and significant environmental benefits

Inactive Publication Date: 2016-02-03
XINJIANG TIANZHI CHENYE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method of adjusting the pH value uses liquid sulfuric acid, nitric acid, and hydrochloric acid to drip, which inhibits the reproduction and growth of microorganisms in the downstream sewage treatment. The existing pH adjustment methods have the following problems: In the wastewater adjusted by the three acids, sulfate radicals will produce hydrogen sulfide during the biochemical reduction process of wastewater. Hydrogen sulfide is a highly toxic substance to microorganisms, which hinders the operation of sewage; Pipelines are corroded, and chlorine radicals higher than 1000mg / l have an inhibitory effect on microorganisms; thirdly, wastewater treated with nitric acid not only needs to consider the storage safety of nitric acid, but also needs to be treated by nitrification and denitrification after nitrate radicals enter the water body. Bring difficulty to sewage treatment process

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  • Method for adjusting pH value of alkaline waste water
  • Method for adjusting pH value of alkaline waste water
  • Method for adjusting pH value of alkaline waste water

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Effect test

Embodiment 1

[0020] Embodiment 1: a kind of pH adjustment method of alkaline wastewater, comprising a mixed reaction tank 2, the top of the mixed reaction tank is provided with a tail gas flowmeter 4, and the bottom of the mixed reaction tank is provided with a circulation pump 3; After being passed into the mixing reaction tank, fully mixed reaction is carried out. Finally, the unreacted acid gas and inert gas at the top of the mixing reactor are measured by the tail gas flow meter and then enter the next step. The wastewater with a pH value of 6-9 from the bottom of the mixing reaction tank passes through One part of the pump enters the top reflux of the mixing reaction tank, and the other part enters the next process for use.

Embodiment 2

[0021] Embodiment 2: This embodiment comprises a mixed reaction tank 2, the top of the mixed reaction tank is provided with a tail gas flow meter 4, the bottom of the mixed reaction tank is provided with a circulation pump 3, and a gas transmission device 1 is arranged before the mixed reaction tank, and the acid gas passes through the After the gas equipment is pressurized, it is passed into the mixing reaction tank and the alkaline wastewater passed into the upper part of the mixing reaction tank is reversely contacted to carry out the acid-base neutralization reaction. Finally, the unreacted acid gas and inert gas at the top of the mixing reactor are measured by the tail gas flowmeter Entering the next step, the wastewater with a pH value of 6-9 from the bottom of the mixing reaction tank passes through the circulating pump, part of it enters the top of the mixing reaction tank for reflux, and the other part enters the next process for use.

Embodiment 3

[0022] Embodiment 3: This embodiment is different in that the gas transmission equipment is a fan.

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Abstract

The invention relates to a method for adjusting a pH value of alkaline waste water. According to the method, a mixing reaction pot is provided, a tail gas flowmeter is arranged at top of the mixing reaction pot, a circulating pump is arranged at bottom of the mixing reaction pot, CO2-containig acidic tail gas generated during a production process is used as a raw material, the pH value of the alkaline waste water is adjusted, so that the novel pH value adjusting method is explored, acidic gas and the alkaline waste water are fully mixed and reacted by a jet reactor, and pH value adjusting for the alkaline waste water is conveniently realized. The method has the advantages of simple and reasonable process, easy control and less risk, and problems of corrosion and safety due to liquid acid can be avoided, by using tail gas to adjust the pH value, acidic gas discharge is reduced, operation cost is reduced, and environment benefit is obvious.

Description

technical field [0001] The invention relates to a method for adjusting the pH value of alkaline wastewater, and is particularly suitable for the field of pretreatment of wastewater in the water treatment industry. Background technique [0002] At present, my country is the world's largest soda production base. As of 2014, the output of various types of soda has reached 42 million tons. A large number of soda production and soda consumption enterprises not only face the problem of high energy consumption, but also the alkali-containing wastewater generated in the production process The pH adjustment and the harm to the environment have become increasingly prominent. [0003] The traditional method of adjusting the pH value uses liquid sulfuric acid, nitric acid, and hydrochloric acid to drip, which inhibits the reproduction and growth of microorganisms in the downstream sewage treatment. The existing pH adjustment methods have the following problems: In the wastewater adjuste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66B01D53/78B01D53/62
Inventor 关刚吴彬邓健康张永龙唐红建陆俊张红雷杨军马银山朱建强
Owner XINJIANG TIANZHI CHENYE CHEM