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Electroplating effluent treatment method

A technology for electroplating wastewater and treatment method, which is applied in the fields of metallurgical wastewater treatment, heating water/sewage treatment, combustion methods, etc., can solve the problems of high engineering cost and treatment cost, poor adaptability, unsuitable for wastewater treatment, and simplify the operation steps. , the effect of reducing the burden

Inactive Publication Date: 2006-07-26
HENAN ANCAI HI-TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the propagation speed of functional bacteria in this method is slow and the reaction efficiency is limited, so it is not suitable for processing Cr 6+ high concentration wastewater
In addition, the temperature when cultivating functional bacteria needs to be kept at about 40°C, and synthetic medium needs to be dosed quantitatively every day, so the adaptability of this method is poor, and the engineering cost and processing cost are high

Method used

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  • Electroplating effluent treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Cr in automobile manufacturing electroplating wastewater 6+ The concentration was 78 mg / l and the organic matter concentration was 810 mg / l. The electroplating wastewater was sent to an evaporation tank for evaporation and concentration at 90° C. for 3 hours to obtain a concentrated solution with a water content of 35%.

[0051] The concentrated solution is directly sprayed into a high-temperature flame in the form of water mist through a nozzle for combustion to obtain electroplating sludge with a moisture content of 8%. Among them, the flame burning device uses natural gas as the heat source, the volume ratio of natural gas and air is 3.5:7, the calorific value of natural gas is 8700 kcal / m3, the pressure of natural gas is 0.2MPa, the pressure of air is 0.65MPa, and the flame temperature is 950°C . The exhaust gas is shown in Table 1.

[0052] The electroplating sludge was sent to an oven, and dried at 400° C. for three and a half hours to obtain dry sludge with a ...

Embodiment 2

[0054] Cr in galvanized rinse solution 6+ The concentration of the organic matter is 91mg / l, the concentration of the organic matter is 740mg / l, the Cr in the deplating solution 6+ The concentration of organic matter is 167mg / l, and the concentration of organic matter is 940mg / l.

[0055] The rinsing solution is recovered to the electroplating water tank, and then evaporated and concentrated by using a three-effect heating evaporation device to obtain a concentrated solution with a water content of 40%. The temperature of the three-effect heating and evaporating device is: 90°C for the first effect, 80°C for the second effect, and 70°C for the third effect; the vacuum degree is: 0.04 atmosphere for the first effect, 0.05 atmosphere for the second effect, and 0.06 atmosphere for the third effect.

[0056] The concentrated solution and the deplating solution are sent to the concentrated water tank, and then directly sprayed into the high-temperature flame through the nozzle in ...

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Abstract

The invention provides a process for treating electroplating wastewater containing chromium and high concentration organics, wherein evaporating concentration and flame incandesce technique is employed to remove the moisture and organics in the waste water, and to deacidize Cr6+ into Cr3+, the produced dry sludge can be used to make bricks.

Description

technical field [0001] The invention relates to electroplating wastewater treatment, in particular to a method and equipment for treating electroplating wastewater containing chromium and high-concentration organic matter. Background technique [0002] Electroplating can change the surface properties of metal or non-metal products, such as corrosion resistance, appearance decoration, electrical conductivity, wear resistance, weldability, etc. It has been widely used in machinery manufacturing industry, light industry, electrical and electronic industry, etc. However, electroplating usually requires the use of a large amount of strong acid, strong alkali, heavy metal solution, and even toxic and harmful chemicals such as cadmium, cyanide, and chromic anhydride, and discharges waste water, waste gas, and waste residue that pollute the environment and endanger human health during the process. my country's electroplating industry discharges about 400 million tons of heavy metal-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04F23G7/04C02F103/16
Inventor 张国林宁中和崔文贵李伟超杨峻青刘章杰张东来王学波屈艳君
Owner HENAN ANCAI HI-TECH
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