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Device and method for treating zinc smelting waste water by using parallelly-connected aluminum electrodes with electro-coagulation method

An electro-flocculation and parallel technology, which is applied in the fields of metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of spending a lot of time in microbial domestication and difficulty in screening strains, achieving low cost, simple equipment, The effect of short operating cycles

Inactive Publication Date: 2012-07-04
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of removing heavy metals by biological methods is low, but it takes a lot of time to acclimate microorganisms in the early stage, and strain screening is difficult

Method used

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  • Device and method for treating zinc smelting waste water by using parallelly-connected aluminum electrodes with electro-coagulation method
  • Device and method for treating zinc smelting waste water by using parallelly-connected aluminum electrodes with electro-coagulation method
  • Device and method for treating zinc smelting waste water by using parallelly-connected aluminum electrodes with electro-coagulation method

Examples

Experimental program
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Effect test

Embodiment 1

[0014] The anode in the electroflocculation unit is an aluminum plate, the cathode is a stainless steel plate, the distance between the plates is 1cm, the power supply is a constant current and constant voltage power supply, the current is controlled at 7.6A, and the voltage is stable at 3.7v. 2+ and Cd 2+ Concentrations are 434.80mg / L and 17.39mg / L respectively, add lime to adjust the pH value of the influent to 8.0, electrolyze for 100 seconds at a temperature of 25°C, and let stand for 10 minutes.

[0015] After determination, using the present invention to treat Zn in zinc smelting wastewater 2+ and Cd 2+ , where Zn 2+ and Cd 2+ The removal rates were 99.4% and 96.3%, respectively.

Embodiment 2

[0017] The anode in the electroflocculation unit is an aluminum plate, the cathode is a stainless steel plate, the distance between the plates is 1cm, the power supply is a constant current and constant voltage power supply, the current is controlled at 7.6A, and the voltage is stable at 3.7v. 2+ and Cd 2+ Concentrations are 522.69mg / L and 31.10mg / L respectively, add lime to adjust the pH value of the influent water to 9.0, electrolyze for 100 seconds at a temperature of 25°C, and then let stand for 10 minutes.

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Abstract

The invention relates to a device and a method for treating zinc smelting waste water by using parallelly-connected aluminum electrodes with an electro-coagulation method. The device comprises a neutralizing tank, a peristaltic pump, an electro-coagulation unit base, an electro-coagulation unit, aluminum anodes and corrosion resistant plate cathodes. The left side of the neutralizing tank is connected with a waste water inlet, the upper side of the neutralizing tank is connected with an inlet of the peristaltic pump, and an outlet of the peristaltic pump is connected with an inlet on the left side of the lower side of electro-coagulation unit. Neutralized waste water enters the electro-coagulation unit and is treated by the parallelly-connected aluminum electrodes in the electro-coagulation unit, and a water outlet on the right side of the upper side of the electro-coagulation unit discharges treated water. The method for details is demonstrated in a specification. The device and the method have the advantages of effectively combining the electrochemical technology, the chemical coagulation technology and the electrical floatation technology through the electro-coagulation method, can completely remove heavy metal, and are simple in device, easy and convenient to operate, short in operation period, low in cost and free of large amounts of waste residues.

Description

technical field [0001] The invention relates to a waste water treatment device and a method thereof, in particular to a parallel aluminum electrode electrocoagulation treatment device and a method for zinc smelting waste water. Background technique [0002] In the past 10 years, my country's non-ferrous metal industry has developed rapidly, but a large amount of strongly acidic and high-concentration mixed heavy metal metallurgical wastewater, such as composite wastewater containing zinc and cadmium and other heavy metal ions, has been produced during its smelting process. Once these heavy metals enter the environment, they will cause great harm to human health. For example, inhaling zinc will cause thirst and chest tightness, eating zinc by mistake will stimulate the gastrointestinal tract, and cadmium will cause kidney disease and bone disease. 1955 Until 1972, the itai-itai incident occurred in the Jinzugawa River Basin in Toyama Prefecture, Japan, which was the result of...

Claims

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Application Information

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IPC IPC(8): C02F1/463C02F1/62C02F103/16
Inventor 童美萍张石磊晋银佳
Owner PEKING UNIV
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