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Dual deodorization method for sewage based on acidification by mixed acids and oxidation by ozone

A technology of ozone oxidation and mixed acid, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. The effect of shortening, reduced biotoxicity, and simple process operation

Inactive Publication Date: 2014-04-16
HUNAN VAUBAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The conventional pollution indicators defined by my country's current sewage reuse water quality standards cannot truly reflect the potential safety risks caused by trace harmful substances and pathogenic microorganisms in the water during the reuse process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the embodiment of the present invention, a double deodorization method of sewage based on mixed acid acidification and ozone oxidation, the secondary effluent of the urban sewage treatment plant is first entered into the pH adjustment pool, and then citric acid, acetic acid, and malic acid are added to the pH adjustment pool , the mixed acid of boric acid, adjust the pH value to be 5.5, described citric acid: acetic acid: malic acid: the volume ratio of boric acid is 1:0.5:0.5:0.5; Then add potassium hydroxide to adjust the pH value to be 6.8, then adjust the pH value The effluent of the pool enters the ozone reaction device from the upper part, and the ozone gas enters from the lower part, and the gas and water flow countercurrently to carry out the ozone oxidation reaction. The dosage is 0.05mgO 3 / mg DOC (that is, the amount of ozone added per mg of dissolved organic carbon in wastewater is 0.05mg).

Embodiment 2

[0022] A double deodorization method for sewage based on mixed acid acidification and ozone oxidation. The secondary effluent of the urban sewage treatment plant enters the pH adjustment tank first, and then adds a mixed acid of citric acid, acetic acid, malic acid, and boric acid to the pH adjustment tank. Adjust the pH value to 6, the volume ratio of citric acid: acetic acid: malic acid: boric acid is 1:1:1:1; then add potassium hydroxide to adjust the pH value to 6, and then enter the effluent from the pH adjustment tank from the top Ozone reaction device, the ozone gas enters from the lower part, the gas and water flow countercurrently to carry out the ozone oxidation reaction, and the effluent passes through the quartz sand filter tank to obtain odorless and clear ecological garden water; among them, the amount of ozone gas used in the ozone treatment process is 2mgO 3 / mg DOC (that is, the amount of ozone added per mg of dissolved organic carbon in wastewater is 2mg).

Embodiment 3

[0024] A double deodorization method for sewage based on mixed acid acidification and ozone oxidation. The secondary effluent of the urban sewage treatment plant enters the pH adjustment tank first, and then adds a mixed acid of citric acid, acetic acid, malic acid, and boric acid to the pH adjustment tank. Adjust the pH value to 6.5, the volume ratio of citric acid: acetic acid: malic acid: boric acid is 1:2:0.5:1; then add potassium hydroxide to adjust the pH value to 7.2, and then enter the effluent of the pH adjustment pool from the top Ozone reaction device, ozone gas enters from the lower part, and the gas and water flow countercurrently for ozone oxidation reaction, and the effluent passes through the quartz sand filter tank to obtain odorless and clear ecological garden water; among them, the amount of ozone gas used in the ozone treatment process is 5mgO 3 / mg DOC (that is, the amount of ozone added per mg of dissolved organic carbon in wastewater is 5mg).

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PUM

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Abstract

The invention discloses a dual deodorization method for sewage based on acidification by mixed acids and oxidation by ozone. The dual deodorization method comprises the following steps: introducing secondary effluent from an urban sewage treatment plant into a pH regulating tank; adding mixed acid of citric acid, acetic acid, hydroxy butanedioic acid and boric acid into the pH regulating tank to regulate pH to be 5.5-6.5; adding potassium hydroxide to regulate the pH to be 6.8-7.2; introducing the effluent of the pH regulating tank into ozone reaction equipment from the upper part of the ozone reaction equipment; introducing ozone into the ozone reaction equipment from the lower part of the ozone reaction equipment for ozone oxidation due to countercurrent of the effluent and the ozone; introducing the effluent into a quartz sand filter basin to obtain odorless and clear water for ecological gardens. The dual deodorization method conducts preliminary deodorization through the four well-selected acids; the effect is obvious; thorough deodorization is realized through the ozone treatment; then the odorless and clear water for the ecological gardens is obtained after filtration; organic pollutant concentration, chromaticity and turbidity of the prepared water for the ecological gardens are lowered obviously.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a double deodorization method for sewage based on mixed acid acidification and ozone oxidation. Background technique [0002] With the rapid development of my country's social economy and the acceleration of urbanization, the problems of urban water shortage and environmental pollution are particularly prominent, and water resources have become an important factor restricting social and economic development. The amount of urban sewage is almost equal to that of urban water supply. It has the characteristics of sufficient water quantity and stable water quality. It is a potential water resource. The recycling of urban sewage is one of the effective ways to solve the current shortage of water resources. [0003] At present, the ozone treatment method has been widely used in urban sewage treatment. Because ozone is a strong oxidant, it has strong characteristics of sterilization, disinfe...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/78
Inventor 刘军亮
Owner HUNAN VAUBAN ENVIRONMENTAL PROTECTION TECH CO LTD