Comprehensive treatment method and device for Se-containing wastewater

A comprehensive treatment and wastewater technology, applied in water/sewage treatment, water treatment parameter control, biological water/sewage treatment, etc., can solve problems such as troublesome selection of chemicals, limited tolerance of anaerobic organisms, inability to treat selenium-containing wastewater, etc. , to achieve the effect of reducing processing load, reducing toxicity and improving economic benefits

Active Publication Date: 2018-05-25
FUSHUN RES INST OF PETROLEUM & PETROCHEMICALS SINOPEC CORP +1
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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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  • Comprehensive treatment method and device for Se-containing wastewater

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Embodiment 1

[0032] The selenium-containing wastewater is treated by the technological process of the invention. The quality of the wastewater was as follows: pH was 7.3, and single-column ion chromatography was used to determine the selenate ion (SeO) in the wastewater. 4 2- ) concentration was 3263.2 μg / L, selenite ion (SeO 3 2- ) concentration was 2697.3 μg / L, COD was 633 mg / L, and ammonia nitrogen was 52.4 mg / L. The concentration of sulfur dioxide in the flue gas is 3170mg / m³.

[0033] A two-stage gas-liquid contact reaction tower is used, and the wastewater containing selenium first enters the second reactor, and the volume ratio of liquid to gas is controlled to be 5L / m 3 , remove the sulfur dioxide in the flue gas, and purify the gas for discharge; the effluent from the second reactor enters the anaerobic reactor, and the biological contact tower is used to inoculate the de-selenium sludge taken from the selenium-containing environment. 8. The treatment time is 8h, and 55% of t...

Embodiment 2

[0036] The selenium-containing wastewater is treated by the method of the invention. Wastewater quality: pH was 6.7, and the selenate ion (SeO) was determined by single-column ion chromatography. 4 2- ) was 21228.3 μg / L, selenite ion (SeO 3 2- ) was 12757.7 μg / L, COD: 682 mg / L, ammonia nitrogen: 73.3 mg / L. The concentration of sulfur dioxide in the flue gas is 8630mg / m³.

[0037] A two-stage gas-liquid contact reaction tower is adopted, and the wastewater containing selenium first enters the second reactor, and the volume ratio of liquid to gas is controlled to be 25L / m 3 , remove the sulfur dioxide in the flue gas, and purify the gas for discharge; the effluent from the second reactor enters the anaerobic reactor, and the biological contact tower is used to inoculate the de-selenium sludge taken from the selenium-containing environment. The temperature is controlled at 30 °C and the pH is 7. -8, the treatment time is 12h, and 51% of the selenate ions in the wastewater ar...

Embodiment 3

[0040] The anaerobic activated sludge taken from the selenium-containing environment was used for the following domestication: (1) The nutrient salts ammonium chloride and potassium dihydrogen phosphate were added to the original selenium-containing wastewater in advance, so that the concentrations were 1 mg / L and 0.2 mg / L, respectively. L, and add a certain concentration of methanol as the hydrogen source; (2) adopt the continuous water inflow operation mode to control the SeO in the influent water 4 2- The concentration is 400μg / L, and the hydraulic retention time is controlled to be 8h. When the effluent SeO 4 2- When the concentration is lower than 100μg / L, the SeO 4 2- Anaerobic sludge with specific reducing ability; (3) Adopt intermittent influent operation mode, and gradually increase SeO in influent according to 100μg / L 4 2- The concentration of SeO in the anaerobic sludge 4 2- Bacteria with strong processing ability proliferate in large quantities; when SeO ent...

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Abstract

The invention relates to a comprehensive treatment method and device for Se-containing wastewater. Two stages of reactors are adopted, the Se-containing wastewater enters a second reactor firstly andis subjected to a reaction with sulfur-containing flue gas, SO2 in the flue gas is removed, and purified gas is discharged; effluent of the second reactor enters an anaerobic reactor, and selenate ions in the wastewater are reduced into selenite ions; effluent of the anaerobic reactor returns to a first reactor and is subjected to a reaction with the flue gas, and the selenite ions are removed; effluent of the first reactor enters an aerobic reactor, and effluent of the aerobic reactor is subjected to flocculating sedimentation, solid-liquid separation is performed, and a product is discharged. The Se-containing wastewater is treated by the sulfur-containing flue gas, so that the Se-containing wastewater and the sulfur-containing flue gas are treated efficiently simultaneously, waste is treated by waste, treatment cost of the Se-containing wastewater is reduced, the removal rate for Se pollutants in the wastewater is higher than 95%, and content of SO2 in the sulfur-containing flue gasis lower than 20 mg / L.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a comprehensive treatment method and device 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 irr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14B01D53/50B01D53/78C02F3/12C02F3/28C02F1/52C02F1/56C02F1/66C02F101/10C02F101/16
CPCB01D53/507B01D53/78C02F1/52C02F1/5245C02F1/56C02F1/66C02F3/1268C02F3/2813C02F9/00C02F2101/10C02F2101/16C02F2209/005C02F2209/02C02F2209/06C02F2209/08C02F2209/22Y02W10/10
Inventor 周彤许莹
Owner FUSHUN RES INST OF PETROLEUM & PETROCHEMICALS SINOPEC CORP
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