A comprehensive treatment method and device for selenium-containing wastewater

A comprehensive treatment and wastewater technology, applied in water/sewage treatment, water treatment parameter control, water/sewage multi-stage treatment, etc., can solve the trouble of choosing chemicals, can not handle selenium-containing wastewater, limited anaerobic biological tolerance, etc. problems, achieve the effects of reduced processing load, improved economic benefits, and reduced toxicity

Active Publication Date: 2019-11-15
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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  • A comprehensive treatment method and device for selenium-containing wastewater

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Embodiment 1

[0032] The process flow of the invention is adopted to treat the selenium-containing wastewater. The water quality of the wastewater is: pH is 7.3, and the selenate ion (SeO2) in the wastewater is determined by single column ion chromatography. 4 2- ) concentration is 3263.2μg / L, selenite ion (SeO 3 2- ) concentration was 2697.3μg / L, COD was 633mg / 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 adopted, the selenium-containing wastewater first enters the second reactor, and the liquid-gas volume ratio is controlled to be 5L / m 3 , remove sulfur dioxide in the flue gas, and discharge the purified gas; the effluent from the second reactor enters the anaerobic reactor, and uses a biological contact tower to inoculate the deselenium sludge from the selenium-containing environment. The temperature is controlled at 30°C and the pH is 7- 8. The treatment time is 8 ho...

Embodiment 2

[0036] 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 was 12757.7μg / L, COD: 682mg / 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, the selenium-containing wastewater first enters the second reactor, and the liquid-gas volume ratio is controlled to be 25L / m 3 , remove sulfur dioxide in the flue gas, and discharge the purified gas; the effluent from the second reactor enters the anaerobic reactor, and uses a biological contact tower to inoculate the deselenium sludge from the selenium-containing environment. The temperature is controlled at 30°C and the pH is 7 -8, the treatment time is 12 hours, and 51% of the selenate ions in the wastew...

Embodiment 3

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

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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 Patents(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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