Electroless Plating Wastewater Advanced Treatment Method

An advanced treatment and electroless plating technology, which is applied in metallurgical wastewater treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of poor treatment effect, large molecular weight, high cost, etc., and increase the gas-liquid-solid contact area , The gas-liquid mass transfer efficiency increases, and the effect of improving the utilization rate of ozone

Active Publication Date: 2022-04-12
GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of traditional Fenton and electrochemical methods is generally high. Fenton method often produces a large amount of sludge due to the need to add ferrous iron as a catalyst, which must be treated as hazardous waste
Moreover, the actual operation of the site requires dehydration treatment and storage space for the sludge, and the cost of treatment is very high.
[0004] It is difficult to achieve the treatment effect of 0.1mg / L for the treatment of complexed nickel by electrochemical methods, and there are certain safety hazards in the actual on-site operation and maintenance
For the physical adsorption method, the organic matter content in the electroless plating wastewater is relatively high, and the molecular weight is generally large. For fine-pore activated carbon, the actual treatment effect is not good.

Method used

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  • Electroless Plating Wastewater Advanced Treatment Method
  • Electroless Plating Wastewater Advanced Treatment Method
  • Electroless Plating Wastewater Advanced Treatment Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] Several streams of running wastewater from an electroplating wastewater treatment plant in a park in Dongguan were taken for testing, including comprehensive wastewater, nickel-containing wastewater and electroless plating wastewater. Compare the treatment effects of various water after oxidation.

[0133] refer to Figure 1-4 , the ozone generator 310 supplies ozone to the first dissolved air pump 800 and the first ejector 900 through the ozone supply pipe 600, and a gas flow meter 700 is provided on the ozone supply pipe 600 for calculating the ozone supply amount; the waste water supply pipe 110 The waste water is supplied to the first dissolved air pump 800, and the first dissolved air pump 800 mixes the waste water with ozone and transports it to the first injector 900. After the first injector 900 mixes ozone again, it sprays it into the first feed pipe 140, A gas-liquid mixer 120 for remixing ozone and waste water is provided on the first feed pipe 140; after th...

Embodiment 2

[0144] A method for advanced treatment of electroless plating wastewater, the difference from Example 1 is that in this example:

[0145] The dosage of ozone is 120mg / L, the gas-liquid mixing ratio is 1:4, the working pressure of the catalytic ozonation reactor is 0.4Mpa, the number of catalyst layers is 2 layers, and the bulk density of the spherical solid catalyst is 1.6kg / L. 50%. The added heavy metal collector is 100mg / L, the added flocculant PAM is 150mg / L, and the added coagulant PAC is 15mg / L.

[0146] The water quality before and after the treatment in this embodiment was tested, and the test results are shown in Table 2.

[0147] Table 2 Influent water quality and effluent water quality of comprehensive wastewater, nickel-containing wastewater and electroless plating wastewater

[0148]

Embodiment 3

[0150] A kind of electroless plating waste water advanced treatment method processing technology, and the difference of embodiment 1 is, in the present embodiment:

[0151] The dosage of ozone is 150mg / L, the gas-liquid mixing ratio is 1:4, the working pressure of the catalytic ozonation reactor is 0.5Mpa, the number of catalyst layers is 2 layers, and the bulk density of the spherical solid catalyst is 1.86kg / L. 60%. The added heavy metal collector is 100mg / L, the added flocculant PAM is 180mg / L, and the added coagulant PAC is 18mg / L.

[0152] The water quality before and after the treatment in this embodiment was tested, and the test results are shown in Table 3.

[0153] Table 3 Influent water quality and effluent water quality of comprehensive wastewater, nickel-containing wastewater and electroless plating wastewater

[0154]

[0155]

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Abstract

The invention provides a method for advanced treatment of electroless plating wastewater, which relates to the technical field of water pollution control in environmental engineering, and comprises the following steps: S1. After mixing ozone with electroless plating wastewater, spray it into a catalytic ozonation reactor for oxidative breakdown Network pretreatment; S2. After being detected by the pH online monitoring and control device, the wastewater after linkage regulation and pretreatment enters the reaction pool, and in the stirring state, add heavy metal trapping agent, coagulant and auxiliary agent to the electroless plating wastewater in sequence. Coagulant; S3. The waste water after the reaction enters the solid-liquid separation device for solid-liquid separation to obtain standard effluent. The advanced treatment method of electroless plating wastewater provided by the present invention fully mixes ozone and electroless plating wastewater by using a dissolved air jet mixing method, increases the gas-liquid contact area, and accelerates the oxidation efficiency; at the same time, the inner recycling of ozone is set to improve the utilization rate of ozone and save energy. costs. The process is simple and controllable, does not need to repeatedly adjust the pH value, the dosage of chemicals is small, and the amount of sludge produced is low.

Description

technical field [0001] The invention relates to the technical field of environmental engineering water pollution control, in particular to a method for advanced treatment of electroless plating wastewater. Background technique [0002] Heavy metals in electroless plating wastewater mainly exist in the form of complexation. The bond energy of complexed heavy metals is high, and the chelation ability between organic matter and heavy metals is very strong. It is difficult to effectively treat them up to the standard by traditional oxidation methods. With the country's further strict requirements on the discharge of electroplating water pollutants, in 2018, Guangdong Province will implement the "Discharge Standards for Electroplating Water Pollutants" DB44 / 1597-2015 Table 3 Special discharge value discharge standards for water pollutants, including total nickel discharge standards 0.1mg / L, total copper 0.3mg / L. The traditional Fenton oxidation and lye precipitation methods are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/16
CPCC02F9/00C02F2209/06C02F1/001C02F1/52C02F1/5236C02F1/66C02F1/56C02F1/78C02F1/725C02F2103/16C02F2101/20
Inventor 孙水裕郭艳平区雪连关智杰邱培超任杰周建军陈洲周伟文陈俊铭邱俊杰
Owner GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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