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

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

Active Publication Date: 2014-04-16
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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Effect test

Embodiment 1

[0029] In this embodiment, the method of the present invention is used to treat p-nitrophenol simulated 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 was 50 mmol / L, and the pH value of the simulated wastewater was adjusted to 5.0 with 10% sulfuric acid solution.

[0030] The preparation method of used iron-copper bimetal particles is as follows:

[0031] Add iron powder with an average particle size of 0.1 mm into the copper sulfate aqueous solution at room temperature and normal pressure at a stirring speed of 200 r / min. After the iron powder is added, continue to stir for 15 minutes, then let it settle for 15 minutes and then discharge it. clear solution, 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 bi...

Embodiment 2

[0036] The present embodiment adopts the method described in the present invention to process Acid Orange 7 simulated wastewater, the concentration of Acid Orange 7 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 was 50 mmol / L, and the pH value of the simulated wastewater was adjusted to 6.0 with 10% sulfuric acid solution.

[0037] The preparation method of used iron-copper bimetal particles is as follows:

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

Embodiment 3

[0043] The present embodiment adopts method described in the present invention to process ABS resin production waste water, and the COD concentration in this waste water 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 used iron-copper bimetal particles is as follows:

[0045] At a stirring speed of 300 r / min, iron powder with an average particle size of 1.0 mm was added to the copper chloride aqueous solution at room temperature and normal pressure. After the iron powder was added, the stirring was continued for 20 min, and then it was allowed to settle for 5 min before being discharged into the upper clear liquid, wash the obtained solid particles with deionized water to remove salt impurities on the surface, and obtain iron-copper bimetallic particles, and vacuum-dry the obtained iron-copper bimetallic particles at room temperature until there is...

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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 refractory wastewater treatment methods, in particular 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, a galvanic effect occurs between the cementites in the zero-valent iron particles and the iron to form a large number of microscopic corrosion galvanic cells. , in the galvanic reaction, Fe 0 and cementite (C) as the anode and cathode, respectively, the anode (Fe 0 ) corrosion reaction provides a large number of electrons, which are consumed by corrosion. The electrochemical corrosion simultaneously triggers a series of synergistic effects such as flocculation, adsorption, bridging, sweeping, co-precipitation, electrodeposition, and electrochemical reduction. Zero-valent iron technology is based on the electrochemical pr...

Claims

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Application Information

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Patent Type & Authority Patents(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