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Method for enhanced treatment of heavy metal complex wastewater

An enhanced treatment and complex technology, applied in chemical instruments and methods, special compound water treatment, water/sewage treatment, etc., can solve the problems of long hydraulic retention time, low removal efficiency, high treatment cost, etc., to ensure sufficient light , efficient treatment efficiency, and the effect of improving wastewater treatment efficiency

Active Publication Date: 2021-12-03
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of low removal efficiency, high treatment cost and long hydraulic retention time in the treatment of heavy metal complex wastewater by the Fenton method in the prior art, the present invention provides a method for intensified treatment of heavy metal wastewater

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  • Method for enhanced treatment of heavy metal complex wastewater

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Embodiment 1

[0040] A kind of method for the intensive treatment of heavy metal complex waste water of the present embodiment, the waste water to be treated is the electroplating waste water containing carboxyl complexed nickel, wherein, the nickel concentration in the waste water is 18.4mg / L, COD is 127.5mg / L, And contain excess carboxyl. The specific processing steps are:

[0041]S10. Adjust the pH value of the waste water to 3, add 10mmol / L hydrogen peroxide, add 0.9mmol / L ferrous sulfate heptahydrate, and perform Fenton reaction for 5 minutes after mixing;

[0042] S20, adjust the pH value of the wastewater to 4, and irradiate it with a xenon lamp with a light intensity of 500W for 10 minutes;

[0043] S30, further adjusting the pH value of the wastewater to 8, and continuing to illuminate with a xenon lamp with a light intensity of 500W for 5 minutes;

[0044] S40, adjusting the pH value of the waste water to 12, stirring for 5 minutes, and standing for precipitation to obtain treat...

Embodiment 2

[0047] The basic content of this embodiment is the same as that of Example 1, except that the wastewater to be treated in this embodiment is wastewater containing copper complexes, wherein the copper concentration in the wastewater is 28.6 mg / L, and the COD is 150.0 mg / L. L, and contains excess tartaric acid. The specific processing steps are:

[0048] S10. Adjust the pH value of the waste water to 3, add 10mmol / L hydrogen peroxide, add 1.8mmol / L ferrous sulfate heptahydrate, and perform Fenton reaction for 5 minutes after mixing;

[0049] S20, adjust the pH value of the wastewater to 3.5, and irradiate it with a xenon lamp with a light intensity of 300W for 8 minutes;

[0050] S30, further adjusting the pH value of the wastewater to 8, and continuing to illuminate with a xenon lamp with a light intensity of 500W for 5 minutes;

[0051] S40, adjusting the pH value of the waste water to 9, stirring for 5 minutes, standing for precipitation, and obtaining treated waste water. ...

Embodiment 3

[0054] The basic content of this embodiment is the same as that of Example 1, except that the wastewater to be treated in this embodiment is wastewater containing copper complexes, wherein the copper concentration in the wastewater is 24.2 mg / L, and the COD is 200.3 mg / L. L, and contains excess citric acid. The specific processing steps are:

[0055] S10. Adjust the pH value of the waste water to 3, add 10mmol / L hydrogen peroxide, add 1.9mmol / L ferrous sulfate heptahydrate, and perform Fenton reaction for 5 minutes after mixing;

[0056] S20, adjust the pH value of the wastewater to 4, and irradiate it with a xenon lamp with a light intensity of 300W for 5 minutes;

[0057] S30, further adjusting the pH value of the wastewater to 8, and continuing to illuminate with a xenon lamp with a light intensity of 500W for 6 minutes;

[0058] S40, adjusting the pH value of the waste water to 10, stirring for 5 minutes, standing for precipitation, and obtaining treated waste water.

...

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Abstract

The invention discloses a method for enhanced treatment of heavy metal complex wastewater, and belongs to the field of wastewater treatment. According to the method, the ferric iron generated after the Fenton reaction and the residual hydrogen peroxide are utilized to destroy and remove heavy metal complexes in the wastewater under the effect of visible light enhancement; meanwhile, the degradation of organic substances is enhanced, so that the target of rapidly and efficiently removing heavy metals and COD is achieved. The treatment method has the advantages of rapidness, high efficiency, simplicity in operation and easiness in realizing engineering application.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and more specifically relates to a method for intensively treating heavy metal complex wastewater. Background technique [0002] Heavy metals are highly toxic, easy to migrate, persistent, and concealed. They can be enriched in organisms and passed along the food chain step by step, eventually endangering human health. Nowadays, heavy metal pollution has received widespread attention worldwide, and the discharge standards for heavy metal wastewater have gradually become more stringent. For example, Table 2 of the "Electroplating Industry Pollutant Discharge Standard" (GB 21900-2008) requires total chromium to be less than 1.0mg / L, the total nickel is less than 0.5mg / L, the total cadmium is less than 0.05mg / L, and the total copper is less than 0.5mg / L; The total nickel is less than 0.05mg / L, the total cadmium is less than 0.01mg / L, and the total copper is less than 0.5mg / L. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/22C02F101/30
CPCC02F9/00C02F1/722C02F1/725C02F1/30C02F2305/026C02F1/66C02F2101/20C02F2101/22C02F2101/30Y02W10/37
Inventor 张炜铭冯向文赵昕吕振华潘丙才
Owner NANJING UNIV
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