Method for treating selenium-containing wastewater

A treatment method and technology for wastewater, applied in multi-stage water treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of limited anaerobic biological tolerance, troublesome selection of chemicals, inability to treat selenium-containing wastewater, etc. Achieve the effect of easy implementation, improved biodegradability, and short ozone half-life

Active Publication Date: 2015-04-29
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.

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  • Method for treating selenium-containing wastewater

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Effect test

Embodiment 1

[0031] The process flow of the invention is adopted to process the prepared high-concentration 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.

[0032] Selenium-containing wastewater enters the ozone reactor, and the reaction time is 20 minutes (ozone and SeO 3 2- The molar ratio is 1:4), enter the MBBR reactor for aerobic reaction, and the MBBR is fed intermittently; the cycle runs for 12 hours, the water is fed for 4 hours, the aeration is 6 hours, the settlement is 1 hour, the drainage is 0.5 hours, and the idle drainage is 0.5 hours , Idle for 0.5 hours; periodic treatment of water volume 10L, influent flow rate 5L / h; filler dosing ratio (the ratio of the total volume of the filler to the volume of the container) is 30%. The aerobic biological treatment temperature is controlled at ...

Embodiment 2

[0034] The method of the invention is used to process the prepared high-concentration 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 was 12757.7μg / L. Adopt the method of the present invention, carry out treatment test to above-mentioned waste water.

[0035] Add potassium hydroxide solution to adjust the pH of the selenium-containing wastewater to 8, and the selenium-containing wastewater enters the ozone reactor, and the reaction time is 5 minutes (ozone and SeO 3 2- The molar ratio is 1:2), after the ozone reaction, it enters the MBBR reactor for aerobic reaction, and the MBBR intermittently feeds water; the cycle runs for 12 hours, the water intake is 3.5 hours, the aeration is 7 hours, the settlement is 0.5 hours, and the drainage is 0.5 hours. Idle drainage for 0.5 hours, idle for 0.5 hours; ...

Embodiment 3

[0037] The process flow of the invention is adopted to process the prepared high-concentration selenium-containing wastewater. Wastewater water quality: pH is 5.3, utilizes single-column ion chromatography to measure wherein selenate ion (SeO 4 2- ) concentration is 28.7μg / L, selenite ion (SeO 3 2- ) concentration was 2549.2μg / L.

[0038] Add potassium hydroxide solution to adjust the pH of the selenium-containing wastewater to 7, and the selenium-containing wastewater enters the ozone reactor, and the reaction time is 20 minutes (ozone and SeO 3 2- The molar ratio is 1:3), enter the MBBR reactor for aerobic reaction, and the MBBR is fed intermittently; the cycle runs for 12 hours, the water is fed for 4 hours, the aeration is 6 hours, the settlement is 1 hour, the drainage is 0.5 hours, and the idle drainage is 0.5 hours , Idle for 0.5 hours; periodic treatment of water volume 10L, influent flow rate 5L / h; filler dosing ratio (the ratio of the total volume of the filler ...

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Abstract

The invention discloses a method for treating selenium-containing wastewater. The method comprises the following steps: adjusting the pH of the selenium-containing wastewater to be 7-9, performing ozone oxidization in an ozone reactor, oxidizing selenious acid radical ions (SeO3<2->) into selenate radical ions (SeO4<2->), then performing aerobic biological treatment, putting the wastewater into a flocculating settling pool, adding a flocculating agent, stirring and performing solid-liquid separation to obtain wastewater subjected to selenium removal. The method disclosed by the invention is high in removal rate of selenium from the wastewater, wide in application range, easy and convenient to operate and particularly suitable for high-concentration selenium-containing wastewater.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment method for high-concentration 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 and use 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, and the selenium concentration in oil refinery wastewater is usually 170-4900 μg / L. Selenium in drainage and irrigation water in natural selenium-rich areas Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/5236C02F1/5272C02F1/56C02F1/66C02F1/78C02F3/085C02F9/00C02F2101/106C02F2209/06C02F2301/08
Inventor 许莹周彤陈中涛郭宏山
Owner CHINA PETROLEUM & CHEM CORP
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