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A kind of treatment method of selenium-containing wastewater

A waste water and selenic acid technology, which is applied in multi-stage water treatment, water/sewage treatment, biological water/sewage treatment, etc., can solve problems such as troublesome selection of chemicals, inability to treat selenium-containing wastewater, and limited tolerance of anaerobic organisms , to shorten the total reaction time, facilitate long-term storage, and good stability

Active Publication Date: 2017-02-08
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, high-concentration selenium-containing wastewater cannot be treated; in addition, when the selenium concentration in the wastewater is too high or the selenium concentration is constantly changing In some cases, 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 bring trouble to the selection of agents for the subsequent flocculation reaction.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The process flow of the invention is adopted to treat the selenium-containing wastewater. Wastewater water quality is: 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 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.

[0028] Table 1 Main processing unit composition and processing effect of Embodiment 1

[0029]

[0030] The removal rate of selenium reached 97.2%, the removal rate of COD was 88.2%, the removal rate of ammonia nitrogen was 83.1%, and the chroma was <10.

Embodiment 2

[0032] The method of the invention is used to treat the selenium-containing wastewater. Wastewater water quality: pH is 6.7, utilizes single-column ion chromatography to measure wherein selenate ion (SeO 4 2- ) concentration is 21228.3μg / L, selenite ion (SeO 3 2- ) concentration is 12757.7μg / L, COD: 682mg / L, ammonia nitrogen: 73.3 mg / L, B / C: 0.39, chromaticity 105 degrees. The main test device configuration, operating conditions and treatment effects of each treatment unit are shown in Table 2.

[0033] Table 2 Main processing unit composition and processing effect of embodiment 2

[0034]

[0035] The removal rate of selenium reached 96.4%, the removal rate of COD was 87.1%, the removal rate of ammonia nitrogen was 84.2%, and the chroma was <10.

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Abstract

The invention discloses a treatment method of selenium-containing wastewater. The treatment method comprises the following steps: regulating the pH of the selenium-containing wastewater to 8-10, and carrying out ozonation in an ozone reactor to oxidize a selenite ion (SeO3<2->) into a selenate radical ion (SeO4<2->); carrying out aerobic biological treatment, regulating the pH to 3-5, and carrying out chitosan (CTS) adsorption; finally feeding the product into a flocculation sedimentation tank, adding a flocculant, stirring, and carrying out solid-liquid separation, so as to obtain wastewater without selenium. The treatment method has the beneficial effects that the removal rate of the selenium in the wastewater is high, the application range is wide, and the operation is easy and convenient.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for selenium-containing waste water. 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 selenium-rich areas The concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/286C02F1/52C02F1/66C02F1/78C02F3/085C02F9/00C02F2101/106C02F2301/08
Inventor 许莹周彤郭宏山王诗语耿晨晨
Owner CHINA PETROLEUM & CHEM CORP
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