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Process and apparatus for treating waste water containing metal complex

A technology for complexing metal wastewater and wastewater, applied in water/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems that ion exchange cannot completely remove complexing agents, low cost, and good treatment effect. Achieve strong catalytic activity and catalytic effect, prevent agglomeration or passivation, and achieve emission standards

Inactive Publication Date: 2007-12-19
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the Fenton oxidation method alone cannot effectively break the network to achieve the standard discharge of wastewater treatment, and the amount of catalyst iron ions is large, which will increase the treatment cost; the ion exchange method cannot completely remove the complexing agent, and the regeneration solution still contains the complexing agent. The treatment is difficult, and it is only suitable for use in electroplating wastewater treatment plants with a small amount of water; many companies currently use this method of adding heavy metal trapping agents. The method is simple, but the cost of adding this agent is relatively high, and the water treatment The standard cannot be achieved; photocatalysis is still in the stage of laboratory research, and there are still problems such as immature technology and high cost in order to realize engineering applications
[0008] Therefore, for the research of complex metals, there is no good method suitable for engineering applications with low cost and good treatment effect at home and abroad.

Method used

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  • Process and apparatus for treating waste water containing metal complex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Iron powder reduction-Fenton oxidation synergistic treatment of EDTA complexed copper wastewater

[0029] Referring to Fig. 1, it includes a water collecting tank 1, a pH regulating tank 2, a fluidized bed decomplexing reactor 3, a regulating tank 4, a regeneration bed 5, and a coagulation reaction sedimentation tank 6; P1 imports the wastewater from the sump 1 to the pH adjustment tank 2; by adding acid-base chemicals, the pH value in the pH adjustment tank 2 is adjusted, and the pH meter 7 in the pH adjustment tank 2 can accurately control the pH of the wastewater in the pH adjustment tank 2 value, and at the same time put oxidant H in the regulating pool 2 o 2 ; The pH adjustment tank 2 is connected to the fluidized bed decomposition reactor 3 through a pipeline, and the waste water is input from the regulating tank to the fluidized bed decomposition reactor 3 by the pump P2 on the pipeline; the top of the fluidized bed decomposition reactor 3 It is conne...

Embodiment 2

[0035] Example 2 Iron powder reduction-Fenton oxidation synergistic treatment of citric acid complex copper wastewater

[0036] According to the equipment and process of Example 1, the pH of 250ml of citric acid complex copper wastewater with a concentration of 5mg / l (calibrated with copper ions) was adjusted to 2.5 (initial pH was 3.2, adjusted with hydrochloric acid, and accurately controlled by a pH meter ), and follow H 2 O 2 :COD=2.0:1 (use H for each COD value 2 O 2 2 mg) to the wastewater by adding H 2 O 2 (The COD value of the solution was measured by a COD rapid measuring instrument), and the flow rate was 10m / h from the bottom of the fluidized bed breaking reactor. Due to the impact of the liquid flow, the iron powder with a particle size of 0.5mm ( excess) in a fluidized state.

[0037] In the fluidized bed breaking reactor, the iron powder in the fluidized state is fully contacted with the free state metal ions in the wastewater, and a displacement reaction ...

Embodiment 3

[0041] Example 3 Iron powder reduction-Fenton oxidation synergistic treatment of wastewater containing direct copper complex azo dyes

[0042] According to the equipment and process of Example 1, adjust the pH of 100 ml of wastewater containing direct copper complex azo dyes (initial pH value is 7.01; COD is 110.9 mg / L; chromaticity, that is, absorbance, is 0.144) to 4 (using Hydrochloric acid regulation, precise control by pH meter), and according to H 2 O 2 :COD=1.4:1 (use H for each COD value 2 O 2 1.4 mg) to the wastewater by adding H 2 O 2 . The flow rate is 12m / h from the bottom of the fluidized bed breaking reactor. Due to the impact of the liquid flow, the iron powder (excess) with a particle size of 0.5mm filled in the bed is in a fluidized state.

[0043] In the fluidized bed breaking reactor, the iron powder in the fluidized state is fully contacted with the free state metal ions in the wastewater, and a displacement reaction occurs. When the free copper ion...

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Abstract

The process of treating waste water containing metal complex includes: regulating pH value to 2-4 and adding H2O2, contacting with iron powder in a fluidized bed reactor to produce displacement reaction and complex eliminating reaction, adding alkali in a deposition tank one deposit metal ion, and separating supernatant and the lower precipitate. The process can prevent the aggregation and deactivation of iron powder in the reaction, and has greatly raised reaction efficiency, low cost and high waste water treating effect.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a process and a device for synergistically treating complex metal-containing wastewater by using iron powder reduction and Fenton oxidation. Background technique [0002] Complexing agents are chemical reagents used in the production process of surface treatment and other industries. For example, in the electroplating industry, in order to enhance the dispersion ability of the plating solution and achieve a good coating effect, it is necessary to add such as nitrilotriacetic acid, ethylenediamine, tartrate, citrate, triethanolamine, organic phosphoric acid, EDTA, coke, etc. to the plating solution. Phosphoric acid, nicotinic acid and other complexing agents, these complexing agents can combine with metal ions to form strong and stable chelates, especially when the content of metal ions in wastewater is high, they can coordinate to form stable complexes. The metals that are easy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/66C02F1/58C02F1/70C02F103/16
Inventor 杨岳平金洁蓉
Owner ZHEJIANG UNIV
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