Copper-containing wastewater treatment method and device

A waste water and pretreatment technology, which is applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of poor copper removal effect, low sodium carbonate dosage, and unreachable effluent and other problems, to achieve the effect of increasing the sludge concentration ratio, increasing the concentration ratio, and prolonging the service life

Inactive Publication Date: 2017-02-22
TIANJIN UNIV
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Problems solved by technology

Quartz sand is usually added as a seed crystal, and sodium carbonate is added as a precipitant. However, the dosage of sodium carbonate determines the removal rate of copper to a certain extent. If the dosage of sodium carbonate is too low, there is not enough carbonate to react with copper. The effect of copper is not good, the dosage is too high, resulting in the increase of pH value and the formation of flocculent precipitated copper hydroxide
[0005] Most of present research, although can control the mol ratio of sodium carbonate and copper (the ratio of the concentration of sodium carbonate in the reaction and the concentration of copper ion) at certain value makes in inducing crystallization reaction fully generate crystal and improve sediment performance, but The effluent still cannot meet the standard of 1.0mg / L for drinking water in my country (GB5749-2006)

Method used

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  • Copper-containing wastewater treatment method and device

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Effect test

Embodiment 1

[0026] Embodiment 1: the treatment water capacity of device is 15L / h, and the residence time of mechanical stirring reactor is 15 minutes (stirring 5 minutes, precipitation 10 minutes), and the hydraulic retention time of membrane separator is 30 minutes. The device is used to treat simulated wastewater with a pH value of 6.1-6.2 and a copper concentration of 20 mg / L. At the start of the experiment, 0.5g / L basic copper carbonate seed crystals were added to the mechanically stirred reactor; in the experiment, when the dosage of sodium carbonate was controlled at 104mg / L, the mass concentration of copper in the effluent was stabilized below 1mg / L, and with The increase in the amount of treated water gradually decreased to 0.4mg / L, and the removal efficiency reached 98%; the concentration of carbonate ions in the effluent was 50-55mg / L. Under this condition, the concentration factor of the process is 7982. Membrane specific flux from the initial 57L / (m 2 h m) to 33L / (m 2 h m),...

Embodiment 2

[0027] Embodiment 2: the treatment water volume of device is 15L / h, and the residence time of mechanical stirring reactor is 15 minutes (stirring 5 minutes, precipitation 10 minutes), and the hydraulic residence time of membrane separator is 45 minutes. The device is used to treat simulated wastewater with a pH value of 6.2-6.4 and a copper concentration of 20 mg / L. At the start of the experiment, 0.5g / L basic copper carbonate seed crystals were added to the mechanically stirred reactor; in the experiment, when the dosage of sodium carbonate was controlled at 104mg / L, the concentration of copper in the effluent was stabilized below 2mg / L, and the amount of treated water reached After 800L, the concentration of copper in the effluent is stable at 0.07mg / L, and the removal rate reaches 99%; the concentration of carbonate ions in the effluent is 50-55mg / L. Under this condition, the concentration factor of the process is 3175. Membrane specific flux from the initial 62.2L / (m 2 h...

Embodiment 3

[0028]Embodiment 3: the treatment water volume of device is 20L / h, and the residence time of mechanical stirring reactor is 30 minutes (stirring 5 minutes, precipitation 16 minutes), and the hydraulic residence time of membrane separator is 30 minutes. The device is used to treat simulated wastewater with a pH value of 6.1-6.2 and a copper concentration of 50 mg / L. At the start of the experiment, 1g / L basic copper carbonate seeds were added to the mechanically stirred reactor; in the experiment, when the dosage of sodium carbonate was controlled at 180mg / L, the concentration of copper in the effluent was stable at about 0.5mg / L, and the removal rate reached 99%; the carbonate ion concentration in the effluent is 50-60mg / L. Membrane specific flux from the initial 46.9L / (m 2 ·h·m) to 29.6L / (m 2 h m), it can be recovered to 46.2L / (m after chemical cleaning 2 h m).

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Abstract

The invention relates to a copper-containing wastewater treatment method and device. The method includes the steps thatradioactivecopper-containing wastewater, a basic cupric carbonateseed crystal and sodium carbonate in a mechanical stirring reactor react chemically through mechanical stirring, and a precipitate is deposited on the surface of seed crystal basic cupric carbonate to form large-particle dense crystal particles which fast precipitate on the bottom of the mechanical stirring reactor to remove most of copper ions; a small-particle precipitate and a seed crystal enter a membrane separator along with a supernate, and particulate matter is separated through a hollow fiber membrane to further remove the copper ions, so that the copper content of outlet water is substantially reduced. The particulate matter formed in the method is large in particle size, compact in structure and high in settling property, effectively overcomes the defects that a chemical precipitation method is large in sludge output and precipitates are poor in settling property, and increases the concentration multiple of copper treatment without causing serious membrane pollution, and the copper-containing wastewater treatment method is economical and practical.

Description

technical field [0001] The invention relates to a treatment technology for copper-containing wastewater, specifically to remove copper ions from wastewater. Background technique [0002] Copper resources are widely distributed on the earth, and copper metal has many applications in industry. In recent years, with the development of copper mining, metal processing, machinery manufacturing and other industries, the dramatic increase in industrial activities and the large discharge of industrial wastewater have led to increased pollution of heavy metal copper in the environment. Copper can enter water bodies and soils and cause harm to the ecological environment and human body. Excessive copper intake in humans can lead to severe mucosal irritation and corrosion, stomach upset and ulcers, liver and kidney damage, chronic copper poisoning, and brain damage. No matter from the perspective of ecological environment safety or human health, copper is a harmful heavy metal. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/444C02F1/62
Inventor 顾平武耘羽张光辉
Owner TIANJIN UNIV
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