Treatment method of electroplating wastewater

A technology of electroplating wastewater and treatment methods, applied in the field of water treatment, can solve problems such as waste of social wealth, and achieve the effects of solving pollution, high operating profit margins, and simple operation and maintenance

Active Publication Date: 2017-02-15
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

waste of social wealth
[0004] The core problem of treating heavy metal water pollution by electroplating is no...

Method used

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  • Treatment method of electroplating wastewater
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  • Treatment method of electroplating wastewater

Examples

Experimental program
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Embodiment 1

[0030] see figure 1 , is a schematic flow sheet of an embodiment of the treatment method of electroplating wastewater according to the present invention, the method may further comprise the steps:

[0031] S1: Freeze the electroplating wastewater to obtain a mixture of ice and concentrated electroplating wastewater

[0032] During the freezing process of the solution, some salt will be mixed between the ice crystals in the form of salt cells. As time goes by, the salt will form brine channels between the ice bodies, and the residual high-concentration brine will slowly discharge out along the brine channels. . The thinner the ice layer, the shorter the brine channel, the easier the solute is discharged, and the purer the ice. And the smaller the ice crystal volume, the higher the heat transfer efficiency and the shorter the ice melting time. But at the same time, the smaller the ice crystal volume, the larger the surface area, the more solution attached to the surface, and ...

Embodiment 2

[0042] The following is an embodiment of the relationship between the thickness of ice crystals and the treatment effect of electroplating wastewater.

[0043] Taking the acid copper electroplating process as an example, the concentration of the acid copper electroplating solution is 200g / L, and the electroplating wastewater with a concentration of 20g / L is frozen. The freezing ratio is 70%, forming ice crystals of different thicknesses, and then separating the ice-water mixture. Obtain ice crystals and concentrated wastewater, melt the obtained ice crystals and record the concentration of solute after melting ice crystals of different sizes, the results are shown in Table 1.

[0044] Table 1 The relationship between ice crystals of different sizes and the concentration of solute after the ice crystals melt

[0045]

[0046]

[0047] As the solution freezes, some salt will be entrapped between the ice crystals in the form of salt cells. As time goes by, the salt will for...

Embodiment 3

[0049] The following is an embodiment of the relationship between the concentration of electroplating wastewater and operating profit.

[0050] The fresh water after the melting of the ice crystals is recycled to the water for the washing tank. In consideration of the water quality requirements for the washing water in the washing tank and the cost factor of the wastewater treatment volume, taking the acid copper electroplating process as an example, the concentration of the acid copper electroplating solution is 200g / L, as shown in the table 2 is CuSO in electroplating wastewater 4 Concentration of CuSO in fresh water after melting of ice crystals 4 The relationship between the concentration and the average operating profit rate per cubic meter of wastewater, where the operating profit rate = (average value of waste liquid treatment per cubic meter - average cost of waste liquid treatment per cubic meter) / average waste liquid treatment per cubic meter The cost x 100%.

[...

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Abstract

The invention discloses a treatment method of electroplating wastewater. The treatment method of electroplating wastewater comprises the steps of (1) carrying out freezing treatment on the electroplating wastewater, so as to obtain a mixture of ice and concentrated electroplating wastewater; and (2) separating the mixture of ice and concentrated electroplating wastewater obtained in the step (1), so as to obtain ice and concentrated electroplating wastewater. According to the treatment method of electroplating wastewater, electroplate liquid components and fresh water in electroplating water washing wastewater can be separated, a separated electroplate liquid and fresh water are recycled respectively, and almost zero mission of electroplating water washing wastewater and recycling of the electroplate liquid are achieved; and the requirement of the treatment method of electroplating wastewater on the water quality of to-be-treated electroplating wastewater is not high, the operation and maintenance are simple, wastewater in a single rinsing bath can be treated, the treatment method has quite high operation profit rate, and the pollution problem of electroplating heavy metal wastewater can be solved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a treatment method for electroplating wastewater. Background technique [0002] The total amount of electroplating wastewater is relatively small compared with that of papermaking, printing and dyeing, and chemical industries. However, due to the wide distribution of electroplating factories, there are many types of highly toxic substances in wastewater. Electroplating wastewater contains chromium, zinc, copper, Cadmium, lead, nickel and other heavy metal ions, as well as highly toxic sundries such as acid and alkali cyanide, are very harmful. Untreated electroplating wastewater discharged into rivers, ponds, and underground will not only endanger the environment, but also pollute drinking water and industrial water, and some are highly toxic substances that cause cancer and distortion. Heavy metal pollution is highly toxic and belongs to non-degradable conse...

Claims

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Application Information

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IPC IPC(8): C25D21/20C25D21/18C02F1/22C02F103/16
CPCC02F1/22C02F2103/16C25D21/18C25D21/20
Inventor 陈栋荣宏伟张朝升
Owner GUANGZHOU UNIVERSITY
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