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Method for treating hardly-degraded wastewater by ferric and cupric bimetallic particles

A technology for treating wastewater and bimetals, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of shortening the service life of zero-valent iron, affecting wastewater treatment efficiency, and reducing wastewater treatment efficiency and other issues, to achieve the effect of saving reagent costs, enhancing mass transfer process, and facilitating degradation

Active Publication Date: 2012-11-14
成都柏溪环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the zero-valent iron technology has the problem of easy packing compaction in practical applications, and its pH range is narrow, and it is only suitable for acidic wastewater (pH ≤ 4.0)
Under acidic conditions, zero-valent iron can achieve higher wastewater treatment efficiency, but high hydrogen ion concentration will lead to faster corrosion of zero-valent iron, thereby shortening the service life of zero-valent iron and increasing wastewater treatment costs
In order to overcome the shortcomings of the narrow pH application range of the zero-valent iron technology and the excessively fast iron consumption rate, Chinese patent ZL02111901.5 discloses a method for treating refractory wastewater by catalytic iron electrolysis, which uses a potential difference between iron and copper that is much greater than The principle of potential difference between iron and carbon can cause galvanic corrosion to degrade pollutants under neutral conditions. Copper, iron and zeolite are mixed and filled into the filter in the form of a fixed bed, and the wastewater is treated by returning wastewater
This method has a good decomposition effect on refractory pollutants, but there are still the following disadvantages: (1) The barrier of zeolite and the gap between iron and copper will greatly limit the contact between iron and copper, that is, limit the contact between iron and copper. The formation of galvanic corrosion reduces the efficiency of wastewater treatment; (2) The form of fixed bed limits the mass transfer process of pollutants and their degradation products between the surface of filler particles and the solution, thus affecting the efficiency of wastewater treatment; (3 ) The form of fixed bed will also lead to co-precipitation of pollutants and iron corrosion products on the surface of filler particles. Long-term operation will lead to the formation of passivation film on the surface of filler particles, which will seriously affect the efficiency of wastewater treatment.

Method used

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  • Method for treating hardly-degraded wastewater by ferric and cupric bimetallic particles

Examples

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Embodiment 1

[0029] This embodiment uses the method of the present invention to treat simulated p-nitrophenol wastewater. The concentration of p-nitrophenol in the simulated wastewater is 500 mg / L, the COD concentration is about 800 mg / L, and the electrolyte Na 2 SO 4 The concentration is 50 mmol / L, and the pH value of the simulated wastewater is adjusted to 5.0 with a 10% sulfuric acid solution.

[0030] The preparation method of the iron-copper bimetallic particles is as follows:

[0031] Add iron powder with an average particle size of 0.1 mm to the copper sulfate aqueous solution at a stirring speed of 200 r / min at room temperature and normal pressure. After the iron powder is added, continue to stir for 15 minutes, and then let it settle for 15 minutes before being discharged. The clear liquid, the obtained solid particles are washed with deionized water to remove the salt impurities on the surface, and the iron-copper bimetallic particles are obtained, and the obtained iron-copper bimetall...

Embodiment 2

[0036] In this embodiment, the method of the present invention is used to treat acid orange 7 simulated wastewater. The acid orange 7 concentration in the simulated wastewater is 1000 mg / L, the COD concentration is about 850 mg / L, and the electrolyte Na 2 SO 4 The concentration is 50 mmol / L, and the pH value of the simulated wastewater is adjusted to 6.0 with a 10% sulfuric acid solution.

[0037] The preparation method of the iron-copper bimetallic particles is as follows:

[0038] Add iron powder with an average particle size of 0.5 mm to the copper sulfite aqueous solution at a stirring speed of 250 r / min at room temperature and normal pressure. After the iron powder is added, continue to stir for 25 minutes, and then let it settle for 12 minutes before being discharged. With the clear liquid, the obtained solid particles are washed with tap water to remove the salt impurities on the surface to obtain iron-copper bimetallic particles. The obtained iron-copper bimetallic particles...

Embodiment 3

[0043] This embodiment uses the method of the present invention to treat ABS resin production wastewater. The COD concentration in the wastewater is about 1200 mg / L, BOD 5 The / COD ratio is 0.30, and the pH value of the wastewater is adjusted to 8.0 with 2 mol / L sodium hydroxide solution.

[0044] The preparation method of the iron-copper bimetallic particles is as follows:

[0045] Add iron powder with an average particle size of 1.0 mm to the copper chloride aqueous solution at a stirring speed of 300 r / min at room temperature and atmospheric pressure. After the iron powder is added, continue to stir for 20 minutes, and then let it settle for 5 minutes before being discharged. The clear liquid is used to wash the obtained solid particles with deionized water to remove the salt impurities on the surface to obtain iron-copper bimetallic particles. The obtained iron-copper bimetallic particles are vacuum dried at room temperature until the surface is free of moisture before use; The...

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Abstract

The invention relates to a method for treating hardly-degraded wastewater by ferric and cupric bimetallic particles, belonging to the field of a method for treating the hardly-degraded wastewater. The method comprises the following technical steps of: adding the ferric and cupric bimetallic particles into a micro-electrolysis reactor, continuously inputting wastewater to be treated into the micro-electrolysis reactor to be mechanically stirred, enabling the bimetallic particles to be under the fluidifying status and treating the wastewater under the mechanical stirring, and continuously discharging the wastewater treated by the ferric and cupric bimetallic particles, wherein the hydraulic retention time of the wastewater in the micro-electrolysis reactor is 0.5-5h. According to the method, the treatment efficiency of the wastewater can be improved, the passivating and hardening of filler can be avoided, and the pH range of the treated wastewater can be widened.

Description

Technical field [0001] The invention belongs to the field of methods for treating refractory wastewater, and particularly relates to a method for treating refractory wastewater with metal particles. Background technique [0002] There are a large number of tiny cementites inside the zero-valent iron particles. When they are immersed in a conductive electrolyte solution, the galvanic effect occurs between the cementite in the zero-valent iron particles and the iron to form a large number of microscopic corrosion cells , In the galvanic cell reaction, Fe 0 And cementite (C) respectively as anode and cathode, anode (Fe 0 The corrosion reaction of) provides a large amount of electrons, which are consumed by corrosion. The electrochemical corrosion also triggers a series of synergistic effects such as flocculation, adsorption, bridging, roll sweeping, co-precipitation, electrodeposition, and electrochemical reduction. Zero-valent iron technology is based on the principle of electroche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/463
Inventor 赖波陈钊宇李慧强杨平张云红
Owner 成都柏溪环境科技有限公司