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Method and device for removing low-concentration selenium-containing wastewater by hybridization by use of integrated membrane method

A membrane-integrated, low-concentration technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve problems such as failure to meet discharge requirements, waste of water resources, environmental pollution, etc. Recovery rate, reduce environmental pollution, prolong the service life of membrane

Inactive Publication Date: 2018-03-06
HENAN NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems that current single technology is difficult to effectively remove selenium in different valence states and forms in water, cannot meet increasingly stringent discharge requirements, waste water resources and cause serious pollution to the environment, etc., the present invention provides a membrane-integrated hybrid A method and device for removing low-concentration selenium-containing wastewater, which uses a combination of pretreatment + membrane filtration + adsorption precipitation + ion exchange technology, so that the removal rate of selenium in water is as high as 85%, thereby effectively saving water and reducing the risk of excessive concentrations Selenium pollutes the environment, the main body of this process and supporting equipment are compact in structure, complete in function, easy to operate and maintain, and the arrangement can be flexibly combined

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  • Method and device for removing low-concentration selenium-containing wastewater by hybridization by use of integrated membrane method

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Embodiment 1

[0029] When the influent water contains 170μg·L −1 Se 6+ or Se 4+ and 60mg·L −1 Suspended solids and macromolecular substances in the wastewater are pretreated by microfiltration to remove the suspended solids and macromolecular substances in the wastewater containing sulfate selenium. The pretreated water enters the first-stage one-stage NF membrane filtration system. The operating pressure of the NF membrane inlet water is 1.51MPa. The flow rate of product water is 182L h −1 , the selenium concentration in the product water was only 16.8 μg·L −1 , concentrated water flow rate is 89.6mg·L −1 , but there is a high concentration of selenium in the concentrated water, and the content of sulfate is relatively small. The concentrated water directly enters the stirring reaction tank for selenium removal, and the iron / selenium reduction reaction occurs by adding metallic iron to effectively remove the selenium content, and at the same time generate an equivalent amount of iron ...

Embodiment 2

[0031] When the influent contains 200μg·L −1 Se 6+ or Se 4+ and 2000mg·L −1 Suspended solids and macromolecular substances in the wastewater are removed by microfiltration pretreatment, and the pretreated water enters the first-stage two-stage RO membrane filtration system, and the operating pressure of the RO membrane inlet water is 1.84MPa , the water flow rate is 168L h −1 , the selenium concentration in the product water was only 5.7 μg·L −1 , concentrated water flow rate is 103mg·L −1 , but there is a high concentration of selenium in concentrated water, and the content of sulfate is 4528mg L −1 , so by adding milk of lime to the solution to adjust its pH value between 8-10, the calcium salt, magnesium salt, sulfate, etc. The salt precipitation tank was left standing, and the generated crystal flocs settled to the bottom of the tank, thereby reducing the sulfate content in the supernatant to ≤200 mg·L −1 , a small part of the sulfate sludge is returned to the sulfa...

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Abstract

The invention discloses a method and a device for removing low-concentration selenium-containing wastewater by hybridization by use of an integrated membrane method, wherein pretreated produced waterenters a RO / NF membrane filtration system; the filtered produced water is directly discharged, when the sulfate concentration in the concentrated water is low, the concentrated water directly enters aselenium removal stirring reaction tank; when the sulfate concentration in the concentrated water is high, lime is added to the concentrated water and reacted in a sulfate removal stirring reaction tank, and enters a sulfate precipitation tank for removal of a sulfate precipitate, supernatant enters the selenium removal stirring reaction tank for reduction of selenium content, supernatant entersa selenium sedimentation tank, one part of the supernatant in the selenium sedimentation tank is combined with membrane produced water, and the other part of the supernatant returns to a scale-formingiron reduction tank for processing, and enters a RO / NF membrane filtration system. The method adopts the technology of combination of pretreatment+membrane filtration+adsorption precipitation+ion exchange to make the removal rate of selenium in the water up to 85% or more, water consumption can be effectively saved, and the environmental pollution caused by the excessive concentration of seleniumcan be reduced.

Description

technical field [0001] The invention belongs to the technical field of comprehensive treatment process and device for selenium-containing wastewater in water saving and emission reduction, and specifically relates to a method and device for removing low-concentration selenium-containing wastewater by hybridization of integrated membrane method. Background technique [0002] Selenium is an essential micronutrient element for the human body, has anti-cancer and anti-oxidation effects, and can enhance human immunity. However, excessive intake of selenium will cause symptoms of poisoning in the human body, and animals such as birds and fish will show symptoms such as the death, deformity and low survival rate of their embryos after hatching. Because of the uneven distribution of selenium in the Earth's crust, water bodies are polluted, for example, by effluent discharges from mining industries, effluent from fly ash from fossil fuel combustion, or runoff from large agricultural ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/10
CPCC02F9/00C02F2101/106C02F2001/425C02F3/28C02F5/10C02F1/5281C02F1/66C02F1/72C02F1/722C02F1/725C02F1/76C02F1/441C02F1/442
Inventor 宋跃飞李铁梅赵果秦文博户启华张小转樊静
Owner HENAN NORMAL UNIV