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A kind of treatment method of copper-hedp wastewater

A treatment method and wastewater technology, which is applied in the field of copper-HEDP wastewater treatment, can solve the problems of large limitations, large limitations of electrochemical methods, high requirements for photocatalytic oxidation reaction conditions, etc., and achieve high removal rate and economical efficiency. The effect of removal rate and low delivery volume

Active Publication Date: 2022-07-29
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the photocatalytic oxidation method requires high reaction conditions and has great limitations in practical application; the electrochemical method is limited by the electrode material, and the removal effect on high-concentration complexed heavy metals is poor; the traditional Fenton method has overoxidation. Hydrogen (H 2 o 2 ) low utilization rate, large amount of chemical reagents and other shortcomings

Method used

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Examples

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Embodiment 1

[0028] The present embodiment provides a method for treating copper-HEDP wastewater, comprising the following steps:

[0029] (1) Take 500mL copper-HEDP wastewater, filter to remove insolubles; use H 2 SO 4 The pH of the solution and NaOH solution was adjusted to 4.5, and sodium persulfate (Na 2 S 2 O 8 ) to make its concentration in the waste water be 6mmol / L, then add 1g of magnetic anion exchange resin (commercially available MIEX resin, purchased from Orica company, 150-180 μm), and react under stirring conditions (stirring time 1h);

[0030] The total copper content in the copper-HEDP wastewater before the above treatment is 8.3 mg / L, and the HEDP content is 105 mg / L (wherein the phosphorus content is 31.6 mg / L);

[0031] (2) with Ca(OH) 2 The pH of the solution is adjusted to 9, and the solution is stirred evenly and left for 30 minutes. After the precipitation is completely formed, the precipitate is filtered and recovered to complete the treatment of copper-HEDP w...

Embodiment 2

[0034] The present embodiment provides a method for treating copper-HEDP wastewater, comprising the following steps:

[0035] (1) Take 500mL copper-HEDP wastewater, remove insolubles by filtration; use H 2 SO 4 solution and NaOH solution to adjust the pH value to 4, add sodium persulfate (Na 2 S 2 O 8 ) to make its concentration in the wastewater be 10mmol / L, then add 1.5g of magnetic anion exchange resin (commercially available MIEX resin, purchased from Orica company, 150-180 μm), and react under stirring conditions (stirring time 1h);

[0036] The total copper content in the copper-HEDP wastewater before the above-mentioned treatment is 16 mg / L, and the HEDP content is 151 mg / L (wherein the phosphorus content is 45.4 mg / L);

[0037] (2) with Ca(OH) 2 The pH of the solution was adjusted to 10, and the solution was stirred evenly and left for 35 minutes. After the precipitation was completely formed, the precipitate was filtered and recovered to complete the treatment of...

Embodiment 3

[0040] The present embodiment provides a method for treating copper-HEDP wastewater, comprising the following steps:

[0041] (1) Take 500mL copper-HEDP wastewater, remove insolubles by filtration; use H 2 SO 4 The pH of the solution and NaOH solution was adjusted to 3.5, and sodium persulfate (Na 2 S 2 O 8 ) to make its concentration in the wastewater be 14mmol / L, then add 2g of magnetic anion exchange resin (commercially available MIEX resin, purchased from Orica company, 150-180 μm), and react under stirring conditions (stirring time 1.5h);

[0042] The total copper content in the copper-containing-HEDP wastewater before the above-mentioned treatment is 28 mg / L, and the HEDP content is 170 mg / L (wherein the phosphorus content is 51.2 mg / L);

[0043] (2) with Ca(OH) 2 The pH of the solution is adjusted to 9, and the solution is stirred evenly and left to stand for 40 minutes. After the precipitation is completely formed, the precipitate is filtered and recovered to comp...

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PUM

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Abstract

The invention belongs to the field of wastewater treatment, and discloses a method for treating copper-HEDP wastewater. Magnetic resin, react under stirring condition; (2) use Ca(OH) 2 Adjust pH to alkaline, stand to form precipitation, and filter to complete the treatment of copper-HEDP wastewater. The treatment method has the advantages of short treatment time, high removal rate of copper and HEDP, and simplicity and economy.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, in particular to a method for treating copper-HEDP wastewater. Background technique [0002] HEDP (Hydroxyethylidene Diphosphonic Acid) is an organic phosphonic acid scale and corrosion inhibitor. It is not easy to decompose under normal light and heat conditions, and is resistant to acid and alkali and chlorine oxidation. It is also not easy to hydrolyze under high temperature and high pH conditions. . HEDP can form stable complexes with iron, copper, zinc and other metal ions and dissolve oxides on the metal surface, so it is often used as a complexing agent in the copper plating industry, and can form stable complexes with copper ions ( lgK=12.48) to replace the more toxic cyanide copper plating process. [0003] However, the copper-HEDP system (including copper-HEDP complex and free HEDP) remaining in electroplating wastewater is difficult to settle effectively by conventional alkali pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/12C02F101/20C02F101/30
CPCC02F9/00C02F1/001C02F1/66C02F1/62C02F1/72C02F1/488C02F1/42C02F1/52C02F2101/20C02F2101/303C02F2301/08C02F2305/023
Inventor 张平石正琴李伙生李笛刘文峰刘凤丽刘威
Owner GUANGZHOU UNIVERSITY
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