Method for removing EDTA (Ethylene Diamine Tetraacetic Acid) in waste water

A waste water and hydrogen peroxide technology, which is applied in metallurgical waste water treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of inability to reuse reclaimed water, prominent problems of equipment and site occupation, and high primary investment cost

Inactive Publication Date: 2015-04-29
NANJING YUANQUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the stability of EDTA itself, the biochemical treatment cycle of wastewater systems that do not contain heavy metal ions usually exceeds 5 days, resulting in prominent problems of equipment and site occupation, and high initial investment costs
Iron-carbon bed electrolysis is used to treat EDTA. Due to some shortcomings of the iron-carbon bed itself, there are problems of high power consumption and hardening of the iron-carbon bed.
The above methods are only applicable to the direct treatment and discharge of electroplating or electroless plating rinse water, and cannot be used for the reuse of reclaimed water commonly required by the electroplating and electroless plating industries.

Method used

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  • Method for removing EDTA (Ethylene Diamine Tetraacetic Acid) in waste water
  • Method for removing EDTA (Ethylene Diamine Tetraacetic Acid) in waste water
  • Method for removing EDTA (Ethylene Diamine Tetraacetic Acid) in waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0059] In the present embodiment, the effective volume of the oxidation pond is 5m 3 , using a 500W UV lamp. The zinc-nickel alloy electroplating rinsing wastewater of an electroplating enterprise has been measured, and the pollutant content is shown in Table 2 (EDTA and other organic pollutants are represented by COD Cr count):

[0060] Table 2 Contents of various pollutants in rinsing wastewater before and after treatment

[0061]

[0062] (1) Oxidation treatment under ultraviolet radiation: Inject 5000L of rinse wastewater into the oxidation pool, first add 1.76kg of CuSO4·5H 2 O, after stirring for 10 minutes, adjust the pH value of the waste water to 2-3, in this embodiment, pH=2.3; open H 2 o 2 Dosing pump, add 28.9L of hydrogen peroxide with a mass percentage concentration of 30%; after the reagent is added, turn on the ultraviolet light, and stir for 30 minutes at a stirring speed of 120r / min;

[0063] (2) Flocculation and sedimentation: the rinsing wastewater ...

Embodiment 2

[0067] In this embodiment, the effective volume of the oxidation tank is 10m 3 , using two 500W UV lamps. The copper-nickel alloy electroplating rinsing wastewater of an electroplating enterprise, the detection data of various pollutants are shown in Table 3 (EDTA and other organic pollutants are represented by COD Cr count):

[0068] Table 3 Contents of various pollutants in rinsing wastewater before and after treatment

[0069]

[0070] (1) Oxidation treatment under ultraviolet radiation: Inject 10,000L of rinsing wastewater into the oxidation tank. Since it already contains heavy metal copper, there is no need to add CuSO 4 ·5H 2 O, directly adjust the pH value of the solution to 2-3, in this embodiment, pH=2.1; open H 2 o 2 Dosing pump, add 43.84L of hydrogen peroxide with a mass percentage concentration of 30%; turn on the ultraviolet light, and stir and react for 30min at a stirring speed of 120r / min;

[0071] (2) Flocculation and sedimentation: the above-mentio...

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Abstract

The invention discloses a method for removing EDTA (Ethylene Diamine Tetraacetic Acid) in rinsing waste water. According to the method, three process units, namely oxidation treatment under ultraviolet irradiation, flocculation and sedimentation and pH value callback are adopted. According to the method, hydrogen peroxide is oxidized under ultraviolet irradiation in the presence of a specific catalyst so as to realize EDTA removal of the rinsing waste water containing EDTA, and the problem of membrane blockage caused by existence of an EDTA complex during a water recycling process is effectively solved. Meanwhile, by virtue of the method provided by the invention, EDTA removal and metal ion content reduction are realized simultaneously, the problems of high energy consumption and long cycle in the conventional treatment process of waste water containing EDTA are solved, and the purposes of low equipment investment, small occupied area, slight equipment transformation and low operating cost are achieved. Meanwhile, the problem that waste water containing heavy metals and waste water containing EDTA cannot be treated simultaneously by a biochemical method is solved.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a method for removing EDTA in wastewater, in particular to a method for removing EDTA and heavy metal ions in electroplating or electroless plating wastewater. Background technique [0002] The reuse of reclaimed water in the electroplating or chemical plating industry generally refers to the process of recycling the rinsing wastewater generated by rinsing the post-plating products or the pickling wastewater from the pickling of the pre-plating products through reverse osmosis treatment. EDTA (Ethylene Diamine Tetraacetic Acid, EDTA in the present invention means EDTA and its salts.) is a good metal complexing agent, it has six coordination atoms, and can form a molar ratio with all metal atoms It is a 1:1 stable water-soluble coordination compound, which is also commonly known as a chelate. In addition to sodium salts, there are ammonium salts and iron, ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/38C02F103/16
CPCC02F9/00C02F1/32C02F1/52C02F1/66C02F1/722C02F2101/38C02F2103/16C02F2301/08
Inventor 沈德华范正芳康佑军秦晴蔡大牛高娟李瑞鹏张伟宁军毛鸿浩吴冬飞纪国庆裴宁黄亚俊
Owner NANJING YUANQUAN TECH CO LTD
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