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A kind of advanced treatment method of selenium-containing wastewater

A technology for advanced treatment and wastewater, applied in the field of advanced treatment of selenium-containing wastewater, can solve problems such as inability to treat selenium-containing wastewater for a long time, limited anaerobic biological tolerance, and anaerobic reaction effects, and achieve environmental and economic benefits. , the effect of improving biodegradability and high selenium removal rate

Active Publication Date: 2018-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses selenium-containing wastewater directly into the anaerobic reaction without pretreatment. Due to the limited tolerance of anaerobic organisms, it cannot treat high-concentration selenium-containing wastewater for a long time.
In addition, when the selenium concentration in the wastewater is too high or the selenium concentration is constantly changing, the anaerobic reaction may be affected. If the hexavalent selenium is not completely reduced to tetravalent selenium and exists in the anaerobic effluent, it will affect the subsequent flocculation reaction. Potion selection brings trouble

Method used

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  • A kind of advanced treatment method of selenium-containing wastewater
  • A kind of advanced treatment method of selenium-containing wastewater
  • A kind of advanced treatment method of selenium-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The process flow of the invention is adopted to treat the selenium-containing wastewater. Wastewater water quality: pH is 7.3, utilizes single-column ion chromatography to measure wherein selenate ion (SeO 4 2- ) concentration is 326.3μg / L, selenite ion (SeO 3 2- ) concentration was 269.7μg / L, COD (Cr method, the same below) was 483mg / L, ammonia nitrogen was 53.1 mg / L, B / C: 0.34, and chromaticity was 98 degrees. The main test device configuration, operating conditions and treatment effects of each treatment unit are shown in Table 1.

[0025] Table 1 Main processing unit composition and processing effect of Embodiment 1

[0026]

[0027] As can be seen from Table 1, adopting the treatment process of the present invention, the removal rate of selenium reaches 97.5%, the removal rate of COD is 92%, the removal rate of ammonia nitrogen is 91.5%, and the chroma is less than 10. The treated wastewater meets the standard discharge requirements, and more than 90% of th...

Embodiment 2

[0029] The method of the invention is used to treat the selenium-containing wastewater. Wastewater water quality: pH is 6.9, utilizes single-column ion chromatography to measure wherein selenate ion (SeO 4 2- ) concentration is 1228.3μg / L, selenite ion (SeO 3 2- ) concentration is 1757.7μg / L, COD: 637mg / L, ammonia nitrogen: 75.1 mg / L, B / C: 0.17, chromaticity 123 degrees. The main test device configuration, operating conditions and treatment effects of each treatment unit are shown in Table 2.

[0030] Table 2 Main processing unit composition and processing effect of embodiment 2

[0031]

[0032] As can be seen from Table 2, using the treatment process of the present invention, the removal rate of selenium reaches 94.8%, the removal rate of COD is 91%, the removal rate of ammonia nitrogen is 90.4%, and the chroma is <10. The treated wastewater meets the standard discharge requirements, and more than 90% of the selenium pollutants are efficiently recovered.

Embodiment 3

[0034] The water quality, treatment unit and operating conditions of selenium-containing wastewater are the same as in Example 2, except that cross-linked chitosan is used for adsorption, and the preparation method of cross-linked chitosan is: take 1.0 g soluble chitosan and dissolve it in 80 mL In 1% acetic acid solution, stir and dissolve to form a transparent mucus; at 50°C, slowly add 1.0mL epichlorohydrin (analytical grade) dropwise to the solution, then gradually add dropwise 10mL 5% sodium hydroxide, alternately Suction filtration after 20 hours, repeated washing with deionized water and acetone, suction filtration, vacuum drying and sieving for later use. The main test device configuration, operating conditions and treatment effects of each treatment unit are shown in Table 3.

[0035] Table 3 Main processing unit composition and processing effect of embodiment 3

[0036]

[0037] As can be seen from Table 3, adopting the treatment process of the present invention,...

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Abstract

The invention discloses a deep processing method of selenium containing wastewater. The deep processing method comprises the following steps: (1) adjusting the pH value of selenium containing wastewater to a range of 2 to 4 by sulfuric acid, and carrying out Fenton oxidation; (2) adding chitosan into oxidized wastewater obtained in the step (1) to carry out adsorption; (3) after adsorption, subjecting the effluent to an aerobic biological treatment. The method has a high selenium removal rate, most selenium in wastewater is converted into CTS-Se, then recovered, and utilized, at the same time, COD and ammonia nitrogen in wastewater can be removed efficiently, and the processed selenium containing wastewater meets the standards.

Description

technical field [0001] The invention belongs to the field of environmental protection wastewater treatment, and in particular relates to an advanced treatment method for selenium-containing wastewater. Background technique [0002] With the development of industry and agriculture, water bodies are increasingly polluted by selenium, and the phenomenon of excessive selenium in water bodies is becoming more and more common. Selenium-containing industrial wastewater mainly comes from industries that produce selenium and apply selenium, such as smelting selenium-containing metal ores, oil refining, thermal power generation, manufacturing sulfuric acid, pigments, and special glass industries. The selenium concentration in coal mining wastewater is generally 3-330 μg / L, the selenium concentration in gold mining wastewater is generally 200-33000 μg / L, the selenium concentration in oil refinery wastewater is usually 170-4900 μg / L, selenium in drainage and irrigation water in natural ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 许莹周彤郭宏山
Owner CHINA PETROLEUM & CHEM CORP
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