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Zero-discharge reclamation method of electroplating wastewater and apparatus thereof

A technology of electroplating wastewater and zero discharge, which is applied in the fields of metallurgical wastewater treatment, water/sewage treatment, water/sludge/sewage treatment, etc. Simple, easy-to-control effects

Inactive Publication Date: 2007-12-12
广州市龙源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Electroplating wastewater contains a large amount of toxic and harmful heavy metal ions, cyanide, etc. At present, the treatment process of electroplating wastewater is mainly designed according to the "standard discharge" route, which has the following defects: 1. Direct discharge of water resources without full utilization; 2. Heavy metal ions Not yet 100% eliminated, environmental pollution still exists
3. The operating cost of treatment is as little as 2-3 yuan / ton, generally 4-5 yuan / ton, and as high as 6-7 yuan / ton, which is unbearable for the enterprise, which leads to the behavior of the enterprise to secretly discharge, dilute with tap water and discharge. , increasing the difficulty of environmental supervision
4. It does not meet the requirements of clean production and is not conducive to the sustainable development of the electroplating industry
However, how to achieve zero discharge after the electroplating wastewater produced by all various plating types has been treated has not been reported so far.

Method used

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  • Zero-discharge reclamation method of electroplating wastewater and apparatus thereof
  • Zero-discharge reclamation method of electroplating wastewater and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Treat copper-containing wastewater with the equipment in Figure 1.

[0035] Add precipitant sodium hydroxide to the copper-containing wastewater reaction tank to adjust the pH range to 8; introduce the treated copper-containing wastewater into a solid-phase separation device for preliminary solid-phase separation to obtain a solid phase and a liquid phase, and carry out solid phase separation Recover after press filtration, after filtering the liquid phase, process it through an ion exchange device to obtain clear water, and recover the clear water;

[0036] The solid phase separation device is an inclined tube sedimentation tank, the ion exchange device is an ion exchange column, and the exchangers used in the ion exchange column are hydrochloric acid and sodium hydroxide.

Embodiment 2

[0037] Embodiment 2 adopts the device shown in Fig. 1, 2, 3 to carry out processing.

[0038] The copper-containing wastewater, chromium-containing wastewater, cyanide-containing wastewater, nickel-containing wastewater, and pre-treatment wastewater are respectively introduced into the wastewater reaction tank;

[0039] Add precipitant sodium hydroxide to the copper-containing wastewater reaction tank, and adjust the pH range to 8.5;

[0040] The precipitant ferrous sulfate added in the chromium-containing wastewater reaction tank adjusts the pH value to 8.5;

[0041] The precipitating agent sodium hypochlorite added in the cyanide-containing wastewater reaction tank adjusts the pH value to 11;

[0042] The precipitating agent sodium carbonate that adds in the nickel-containing wastewater reaction tank adjusts the pH value to 5;

[0043] Adjust the pH range to 9 in the pretreatment wastewater reaction tank.

[0044] The treated copper-containing wastewater, chromium-contain...

Embodiment 3

[0047] Embodiment 3 adopts the apparatus shown in Fig. 1,2,3 to carry out processing.

[0048] The copper-containing wastewater, chromium-containing wastewater, cyanide-containing wastewater, nickel-containing wastewater, and pre-treatment wastewater are respectively introduced into the wastewater reaction tank;

[0049] Add precipitant sodium hydroxide to the copper-containing wastewater reaction tank, and adjust the pH range to 8;

[0050] The precipitating agent sodium metabisulfite added in the chromium-containing wastewater reaction tank adjusts the pH value to 7;

[0051] The precipitating agent sodium hypochlorite added in the cyanide-containing wastewater reaction tank adjusts the pH value to 11;

[0052] The precipitating agent sodium carbonate added in the nickel-containing wastewater reaction tank adjusts the pH value to 4.5;

[0053] Adjust the pH range to 6 in the pretreatment wastewater reaction tank.

[0054] The treated copper-containing wastewater, chromium...

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Abstract

The invention relates to a zero-release recovery method for electroplated sewage, which comprises: leading the treated tree kind sewages of the copper-contained, the chrome-contained and the cyanogen-contained from sewage reaction pond into solid-liquid separation device for primary separation; after filtering with filter column, using ion exchange device to treat the nickel-contained sewage; and filtering the pretreated sewage through sand filter and carbon filter by turns. This invention is stable and reliable and convenient to control, and needs low cost.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a zero-discharge treatment and reuse method for electroplating wastewater from an electroplating process. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] Electroplating wastewater contains a large amount of toxic and harmful heavy metal ions, cyanide, etc. At present, the treatment process of electroplating wastewater is mainly designed according to the "standard discharge" route, which has the following defects: 1. Direct discharge of water resources without full utilization; 2. Heavy metal ions It has not been 100% eliminated, and environmental pollution still exists. 3. The operating cost of treatment is as little as 2-3 yuan / ton, generally 4-5 yuan / ton, and as high as 6-7 yuan / ton, which is unbearable for the enterprise, which leads to the behavior of the enterprise to secretly discharge, dilute with tap wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/62C02F1/42C02F1/44C02F101/20C02F101/22C02F103/16
Inventor 梁林标
Owner 广州市龙源环保科技有限公司
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