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Advanced treatment method for electroplating wastewater

A technology for advanced treatment and electroplating wastewater, applied in metallurgical wastewater treatment, electrochemical water/sewage treatment, water/sewage treatment, etc. It can solve the problems of fluctuating pretreatment effect, high labor cost, high current density, and achieve charge utilization efficiency. High, low operating cost, high conductivity effect

Inactive Publication Date: 2016-07-06
SUZHOU ZHANQING ENVIRONMENT PROTECTION TECHCO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) The effect of pretreatment fluctuates
[0008] On the other hand, both the Fenton oxidation and iron-carbon micro-electrolysis processes require multiple acid-base adjustments, and the addition of PAC, PAM, etc. to promote solid-liquid separation, so the process is complex and requires continuous operation by staff, resulting in high labor costs.
[0009] In addition, there are two defects in the traditional electrocatalytic oxidation technology: the first is that when the flat electrode is directly used, the required current density is high and the energy consumption is too high, which is only suitable for the treatment of high-concentration organic wastewater with high cost tolerance. However, the cost is higher than that of electroplating wastewater tail water
The second is the existing improved technology, generally by adding catalyst filler between the cathode and anode or making the anode into a three-dimensional structure to improve the catalytic activity, but the manufacturing cost of this structure is high, and the surface of the electrode is easily adhered by pollutants clogging, resulting in loss of catalytic activity

Method used

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  • Advanced treatment method for electroplating wastewater
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  • Advanced treatment method for electroplating wastewater

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Embodiment 1

[0039] The electroplating wastewater in an electroplating park has a water volume of 2,000 tons / day. After physical, chemical and biochemical two-stage treatment, the COD is between 60-70mg / L. Electrocatalytic oxidation is used for advanced treatment. Titanium-coated ruthenium-iridium anodes are used, and the ruthenium content is 70%. , the cathode is made of stainless steel, and the current density is 200A / m 2 . After treatment, the COD is reduced to less than 50mg / L, reaching the special discharge limit of the "Electroplating Pollutant Discharge Standard", and the cost per ton of water is about 0.2-0.4 yuan.

Embodiment 2

[0041] The waste water of an electroplating factory has a water volume of 80 tons / day. After physical and chemical treatment, the COD is between 100-120mg / L. Electrocatalytic oxidation is used for advanced treatment. Titanium-coated ruthenium-iridium anodes are used, with a ruthenium content of 75%, and stainless steel is used for the cathode. The current density is 220A / m 2 . After treatment, the COD is reduced to less than 80mg / L, reaching the "Electroplating Pollutant Discharge Standard", and the cost per ton of water is about 0.4-0.8 yuan.

Embodiment 3

[0043] Wastewater from an electroplating factory, the water volume is 50 tons / day, after physical and chemical treatment, the COD is between 130-150mg / L, and the advanced treatment is carried out by electrocatalytic oxidation, using titanium-coated ruthenium-iridium anode, the ruthenium content is 80%, and the cathode uses graphite. The current density is 230A / m 2 . After treatment, the COD is reduced to less than 80mg / L, reaching the "Electroplating Pollutant Discharge Standard", and the cost per ton of water is about 1.0-1.4 yuan.

[0044] It can be seen that after the advanced treatment of the present invention, the COD of electroplating wastewater has been further significantly reduced, and the cost has been greatly reduced, which has dual social and economic benefits.

[0045] In summary, by optimizing the electrode material, the present invention can also have good catalytic activity in the case of a flat electrode structure without adding fillers, and can still catalyz...

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Abstract

The invention belongs to the technical field of environmental protection and discloses an advanced treatment method for electroplating wastewater. For the electroplating wastewater obtained after physicochemical treatment or physicochemical-biochemical two-level treatment, hydrogen peroxide is added into the electroplating wastewater, advanced treatment is performed by an electrocatalytic oxidation method, and the hydrogen peroxide is catalyzed into hydroxyl radicals with stronger oxidizing ability so as to degrade organic matters in the sewage; compared with the prior art, no drugs but hydrogen peroxide are added in the treatment process, and thus sludge generation is avoided; in the invention, the acid-base adjustment is not needed, and no drugs but hydrogen peroxide are added; moreover, due to high salt content, the electroplating wastewater has remarkably high conductivity; and when electrocatalytic oxidation is adopted for advanced treatment, the utilization efficiency of electric charges is higher, and the cost is lower.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an advanced treatment method of electroplating wastewater. Background technique [0002] Electroplating wastewater contains many small molecular organic substances, such as organic amines, organic acids, organic phosphorus, etc. The COD of raw water is 300-800mg / L. After conventional physical and chemical treatment, the COD is generally 100-300mg / L. If biochemical treatment , it can be further reduced to between 40-150mg / L. Because the biodegradability of electroplating wastewater is poor, it is difficult to treat the COD of electroplating wastewater to below 50 mg / L by conventional biochemical processes. Even if part of the electroplating wastewater can achieve the ideal treatment effect (effluent COD<50mg / L) when the temperature is high (room temperature>10°C) by optimizing the biochemical process, the treatment effect will also be affected b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/72C02F103/16C02F101/12
CPCC02F1/4672C02F2101/12C02F2103/16C02F2209/08C02F2305/026
Inventor 王磊黄正宏李星桥左卫雄
Owner SUZHOU ZHANQING ENVIRONMENT PROTECTION TECHCO LTD
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