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Treatment system and method for treating pre-treatment wastewater of electroplating

A technology of electroplating pretreatment and treatment system, which is applied in the direction of metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. It can solve the problem that the quality of discharged water cannot meet the discharge standards of electroplating pollutants, and it cannot solve the problem of mixed discharge of mud and water , unstable operation and other problems, to achieve the effect of improving the accuracy of dosing, reducing the cost of medicine, and improving the pertinence

Active Publication Date: 2016-03-23
GANZHOU ZHONGLIAN ENVIRONMENT PROTECTION TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a treatment system and method for treating wastewater before electroplating, which are used to solve the problems of unstable operation, high operation intensity, inaccurate dosing, high cost, inability to solve muddy water mixed discharge, The water quality of the discharged water cannot meet the control standards of the "Electroplating Pollutant Discharge Standard" (GB21900-2008)

Method used

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  • Treatment system and method for treating pre-treatment wastewater of electroplating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a hardware electroplating factory, wastewater before electroplating was used as the first sample. The water quality of the first sample to be treated is shown in Table 1:

[0023] Table 1: Influent water quality of the first sample

[0024] water quality index

pH

COD

NH 3 -N

Fe

Zn

concentration

4.50

560

40

75

40

[0025] (unit: mg / l, except pH)

[0026] Step 1, the first sample enters the first pH adjustment tank, the first sample is adjusted for the first time in the first pH adjustment tank, and sodium hydroxide is added to the first pH adjustment tank through the first dosing unit, and the second The time for a pH adjustment is 20 minutes, and the pH of the generated first waste liquid is 8.5;

[0027] Step 2, the first waste liquid enters the air flotation unit, the electrolytic properties of the first waste liquid are adjusted in the air flotation unit, and polyaluminum chloride with a basicity of...

Embodiment 2

[0041] In a hardware electroplating industrial park, wastewater before electroplating was used as the second sample. The water quality of the second sample to be treated is shown in Table 3:

[0042] Table 3: Influent water quality of the second sample

[0043] water quality index

pH

COD

NH 3 -N

Fe

Zn

concentration

3.20

650

30

65

50

[0044] (unit: mg / l, except pH)

[0045] Step 1, the second sample enters the first pH adjustment tank, the first sample is adjusted for the first time in the first pH adjustment tank, and sodium hydroxide is added to the first pH adjustment tank through the first dosing unit, the first The time for secondary pH adjustment is 20 minutes, and the pH of the first waste liquid generated is 8.5;

[0046] Step 2, the first waste liquid enters the air flotation unit, the electrolytic properties of the first waste liquid are adjusted in the air flotation unit, and polyaluminum chloride w...

Embodiment 3

[0060] A certain electroplating director, the wastewater before electroplating was used as the third sample. The water quality of the third sample to be treated is shown in Table 5:

[0061] Table 5: Influent water quality of the third sample

[0062] water quality index

pH

COD

NH 3 -N

Fe

Zn

concentration

6.20

400

45

55

42

[0063] (unit: mg / l, except pH)

[0064] Step 1, the third sample enters the first pH adjustment tank, the third sample is adjusted for the first time in the first pH adjustment tank, and sodium hydroxide is added to the first pH adjustment tank through the first dosing unit, the first time The time for pH adjustment is 20 minutes, and the pH of the generated first waste liquid is 8.5;

[0065] Step 2, the first waste liquid enters the air flotation unit, the electrolytic properties of the first waste liquid are adjusted in the air flotation unit, and polyaluminum chloride with a basicity o...

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Abstract

The present invention belongs to the field of wastewater treatment, and particularly relates to a treatment system and method for treating pre-treatment wastewater of electroplating. The system and the method are used for solving the problems that an existing wastewater treatment system is unstable in operation, large in operating intensity, not accurate in dosage, high in cost, cannot solve the problem of shuffling of sludge and water and the water quality of discharged water cannot reach the standard. The treatment system for pre-treatment wastewater of electroplating provided by the present invention comprises an air flotation pretreatment system, a microelectrolysis treatment system, a biological aerated filter treatment system and a dosing system, wherein the air flotation pretreatment system, the microelectrolysis treatment system and the biological aerated filter treatment system are successively connected; the dosing system is separately connected with the air flotation pretreatment system, the microelectrolysis treatment system and the biological aerated filter treatment system.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment system and method for treating wastewater before electroplating. Background technique [0002] The purpose of the pre-treatment of the plated parts is to obtain a good coating in the subsequent electroplating, such as surface leveling, oil removal, degreasing, erosion and other processes. The pollutants produced include: non-ionic surfactants, anion Organic pollutants such as surfactants and other additives (such as corrosion inhibitors, etc.), mineral oil and wax oil, the water quality is acidic or alkaline. Among them, the main pollutants in the sewage washed during the surface leveling process include suspended matter (mineral oil, colloidal substances such as plated parts), a small amount of heavy metal ions (iron, zinc, etc.), total nitrogen (nitrogen-containing substances) and chemical requirements. Oxygen content (COD); The degreasing and degrea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/16
Inventor 彭春生邓维红王旺钟国先管超蔡向鲲
Owner GANZHOU ZHONGLIAN ENVIRONMENT PROTECTION TECH DEV
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