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An electrochemical method for treating industrial wastewater

An industrial wastewater and electrochemical technology, applied in the field of water treatment, can solve the problems of easy passivation of the plate, high power consumption, and reduced performance reliability, and achieve the effects of uniform oxide film, stable voltage, and reliable performance

Inactive Publication Date: 2016-05-11
江阴和悦鑫环保科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The current electrochemical devices generally use iron or aluminum as the anode, and there are generally the following problems: 1) uneven consumption of the plates and large voltage fluctuations; 2) easy passivation of the plates, resulting in large power consumption and poor performance reliability 3) The removal effect is unstable when multiple heavy metal ions coexist

Method used

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  • An electrochemical method for treating industrial wastewater
  • An electrochemical method for treating industrial wastewater
  • An electrochemical method for treating industrial wastewater

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Experimental program
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Effect test

Embodiment 1

[0038] The original arsenic concentration of arsenic-containing wastewater from a concentrator is 18.3mg / L. After adjusting the pH value to 5 with quicklime, it enters an electrochemical device with a magnesium plate as the anode. The current density is 6mA / cm 2 , the distance between the plates is 10mm. After 240s of electrochemical treatment, the treated water is discharged to the clarification tank. After standing still for 60 minutes, the arsenic concentration in the water is detected to be 0.2mg / L, which is lower than the limit of 0.5mg / L. Repeat the test more than 10 times, and the concentration of arsenic in the effluent can reach the standard.

Embodiment 2

[0040] The original concentrations of copper and zinc in the electroplating wastewater of a certain factory were 19.5ppm and 23ppm respectively. After adjusting the pH value to 6 with sodium hydroxide, it entered the electroplating system with a magnesium alloy plate (in this example, the grade of magnesium alloy: AZ31) as the anode. Chemical device, current density using 8mA / cm 2 , the distance between the plates is 8mm. After 300s of electrochemical treatment, it is discharged into the clarification tank. After standing still for 60 minutes, the concentration values ​​of copper and zinc in the water are detected to be 0.6mg / L and 0.2mg / L respectively, lower than the national The limit value of copper 1mg / L and zinc 5mg / L in the "Comprehensive Wastewater Discharge Standard" meets the discharge standard.

Embodiment 3

[0042] The zinc and cadmium in the wastewater of a smelter exceeded the standard, the original zinc concentration was 41mg / L, the cadmium concentration was 15.7mg / L, and the pH value was 3.8. Raw water directly enters the electrochemical device with magnesium alloy plate (in this embodiment, magnesium alloy grade: AZ40) as the anode without adjusting the pH value, the distance between the plates is 12mm, and the current density is 10mA / cm 2 , the electrolysis time was 360s, and the effluent was discharged into the clarification tank and left to stand for 60 minutes. The concentration values ​​of zinc and cadmium in the water were detected by sampling as 0.4mg / L and 0.07mg / L respectively, which met the discharge standard.

[0043] Under the same parameters, when iron is used as the anode, the zinc content in the effluent water is 0.53mg / L, and the cadmium content is 4.8mg / L. The performance of cadmium removal is seriously interfered by zinc, and cadmium cannot be effectively rem...

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Abstract

The invention belongs to the technical field of water treatment and relates to an electrochemical method for treating industrial wastewater. The electrochemical method can be used for effectively removing heavy metal elements in industrial wastewater by taking magnesium or magnesium alloy as an anode. High-activity magnesium hydroxide generated by a magnesium anode under electrochemical action can efficiently adsorb heavy metal ions in wastewater and is combined with suspended substances in water, and finally, the solid-liquid separation is realized through precipitation, so that the aim of purifying the wastewater is achieved. The method can be used for simultaneously removing heavy metal ions such as zinc, cadmium, copper, arsenium and the like in the industrial wastewater, and the removal rate can be up to more than 95%. Compared with the traditional iron and aluminum anode electrochemical devices, a magnesium anode electrochemical device has the advantages of no easiness for passivation of polar plates, low power consumption, low waste residue quantity and the like, and is suitable for treating wastewater generated in the industries such as metallurgy, mining, electroplating, metal processing and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to an electrochemical method for treating industrial waste water. Background technique [0002] With the rapid development of industry, water pollution has become increasingly serious, which has become an unavoidable topic in today's society. As the types of pollutants in wastewater are becoming more and more complex, and the country's control on wastewater discharge is also stricter, traditional wastewater treatment technologies have been difficult to meet the requirements. [0003] The electrochemical method is used to treat industrial wastewater. It has the advantages of good treatment effect, less waste residue, and strong water quality adaptability. It can be applied to wastewater in many industries including electroplating, mineral processing, smelting, papermaking, petrochemical, textile, food and beverage, etc. processing, has broad application prospects. [0004] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/46C02F1/62
Inventor 尚建库徐正超
Owner 江阴和悦鑫环保科技有限公司
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