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Processing method of Cu(II)-EDTA (Ethylene Diamine Tetraacetic Acid) wastewater

A treatment method and wastewater technology, which are applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution, increase waste water, pollute the environment, etc. The effect of mild conditions, high recycling rate and high mineralization rate

Inactive Publication Date: 2013-02-06
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using sodium sulfide precipitation to remove copper, the removal rate is high, but excessive S 2- It will increase the COD of wastewater, cause secondary pollution, and produce H when the pH decreases. 2 S, pollute the environment
Extraction method, electrolysis method and reverse osmosis membrane method have high requirements on the materials of electrodes and membranes, and require a large investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Step (1). Determination of COD and Cu of 1L Cu(Ⅱ)-EDTA wastewater before treatment 2+ concentration;

[0015] Step (2). Adjust the pH value of 1L Cu(II)-EDTA wastewater in reaction tank 1 to 3, add 1g of fly ash and 0.3g of hydrogen peroxide, and stir for 3 hours to obtain the reacted Cu(II)-EDTA waste water;

[0016] Step (3). After the reacted Cu(II)-EDTA waste water is left to stand, discharge the waste water supernatant to reaction tank 2, add NaOH to the waste water supernatant to adjust the pH value to 11, let stand to collect the precipitate, and filter 77.8 mg of copper oxide was obtained after washing and calcining; the precipitate in reaction tank 1 was dried and reused as a catalyst; the results are shown in Table 1.

[0017] Table 1 COD and Cu before and after Cu(Ⅱ)-EDTA wastewater treatment 2+ concentration

[0018] before processing after treatment Removal rate COD / mg·L -1 1950 161.8 91.7％ Cu 2+ Concentration / mg·L -1 9...

Embodiment 2

[0020] Step (1). Determination of COD and Cu of 1L Cu(Ⅱ)-EDTA wastewater before treatment 2+ concentration;

[0021] Step (2). Adjust the pH value of 1L of Cu(II)-EDTA wastewater in reaction tank 1 to 6, add 10g of red mud and 0.2g of sodium hypochlorite, and stir for 0.5h to obtain the reacted Cu(II)-EDTA wastewater;

[0022] Step (3). After the reacted Cu(II)-EDTA waste water is left to stand, discharge the waste water supernatant to the reaction tank two, adjust the pH value to 12 with NaOH in the waste water supernatant, let stand to get the precipitate, filter, After washing and calcining, 123.7 mg of copper oxide was obtained; the precipitate in reaction tank 1 was dried and reused as a catalyst; the results are shown in Table 2.

[0023] Table 2 COD and Cu before and after Cu(Ⅱ)-EDTA wastewater treatment 2+ concentration

[0024] before processing after treatment Removal rate COD / mg·L -1 2200 103.4 95.3％ Cu 2+ Concentration / mg·L -1 ...

Embodiment 3

[0026] Step (1). Determination of COD and Cu of 1L Cu(Ⅱ)-EDTA wastewater before treatment 2+ concentration;

[0027] Step (2). Adjust the pH value of 1L Cu(II)-EDTA wastewater in reaction tank 1 to 4, add 3g of magnetite and 0.2g of calcium hypochlorite, and stir for 1h to obtain the reacted Cu(II)- EDTA wastewater;

[0028] Step (3). After the reacted Cu(II)-EDTA waste water is left to stand, discharge the waste water supernatant to the reaction tank two, adjust the pH value to 12 with NaOH in the waste water supernatant, let stand to get the precipitate, filter, After washing and calcining, 87.8 mg of copper oxide was obtained; the precipitate in reaction tank 1 was dried and reused as a catalyst; the results are shown in Table 3.

[0029] Table 3 COD and Cu before and after Cu(Ⅱ)-EDTA wastewater treatment 2+ concentration

[0030] before processing after treatment Removal rate COD / mg·L -1 2165 140.7 93.5％ Cu 2+ Concentration / mg·L -1 10...

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Abstract

The invention discloses a processing method of Cu(II)-EDTA (Ethylene Diamine Tetraacetic Acid) wastewater, for solving the problems that the conventional wastewater processing method is high in cost and easily causes secondary pollution and has a trivial process. The processing method comprises the following steps of: measuring the concentration of COD and Cu<2+> in the Cu(II)-EDTA wastewater before processing; adjusting the pH value of Cu(II)-EDTA wastewater in a reaction tank I to 3-6, adding catalysts and an oxidant into the reaction tank I, and stirring and reacting for 0.5 hour to 3 hours, thus obtaining the reacted Cu(II)-EDTA wastewater; and standing the reacted Cu(II)-EDTA wastewater, discharging supernatant liquor of the wastewater into a reaction tank II, adding NaOH into the supernatant liquor of the wastewater to adjust the pH value of the supernatant liquor to 11-12, standing for getting sediments, and filtering, washing and calcining the sediments to obtain copper oxide, wherein sediments in the reaction tank I are recycled as the catalysts after being dried. The processing method has the advantages of degrading organic matter and recycling copper, and has environment-friendly and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of industrial waste liquid resource treatment, and in particular relates to a treatment method for Cu(II)-EDTA waste water. Background technique [0002] The printed circuit board industry, electroplating industry, semiconductor industry, etc. play an important role in my country's economic development, and their manufacturing processes are closely related to metal processing. Since the metal plating rate directly affects the quality of the plated product, organic surfactants and organic polymers are added to the metal plating solution to reduce the metal plating efficiency and improve the quality of the plated product. It is precisely because EDTA has good stability, strong complexation ability to metal ions, and low corrosion characteristics, it is widely used in industrial production to remove metal ions that interfere with chemical reactions or are unnecessary. EDTA is used in the electroless plating pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01G3/02C02F1/72C02F1/76
CPCY02P20/584
Inventor 姚志通张春晓张素玲
Owner HANGZHOU DIANZI UNIV
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