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Electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate

A technology of electrodialysis and concentrated solution, which is applied in the fields of energy waste water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. , Wide application prospects, low environmental pollution effect

Inactive Publication Date: 2012-02-15
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there is no research and application report similar to this application (adopting electrodialysis-high efficiency evaporator combined method to treat industrial mining and metallurgy wastewater film concentrate)

Method used

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  • Electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate
  • Electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate

Examples

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Effect test

Embodiment 1

[0026] The wastewater from a lead-zinc smelter is mainly treated with lime (stone) neutralization + oxidative flocculation + electrochemical + membrane treatment, nanofiltration and reverse osmosis membrane filtration concentrate, its water quality indicators: Pb: 0.4774mg / l, Zn: 0.0402 mg / l, Cd: 0.1898 mg / l, As: 0.015 mg / l, F: 42.09 mg / l, Cl: 11316 mg / l, Na: 8759 mg / l. First adjust the pH of the concentrated solution to 9, control its temperature at 25±0.5°C, control the water flow rate at 300L / h, and enter the electrodialysis system. Under the action of a DC electric field with a voltage and current of 250V and 3A, the operating pressure is 1.0 kg / cm 2 , using a 3-stage packed bed electrodialysis system for further concentration tests, using polytetrafluoroethylene homogeneous positive and negative membranes (F46). Control parameters: turbidity: <3mg / l; oxygen consumption: <3mg / l (KMnO4); iron and manganese content: iron: <0.3mg / l, manganese: <0.1mg / l; influent sludge densi...

Embodiment 2

[0028]A copper mine contains acidic wastewater containing heavy metals. The treatment process is mainly lime (stone) neutralization + oxidation flocculation + membrane treatment. Membrane (nanofiltration + reverse osmosis) filters the concentrated solution. The water quality index: Cu: 1.31mg / l , Pb: 0.174mg / l, Zn: 0.063mg / l, Fe: 0.820mg / l, Cl: 8975mg / l, Na: 6849mg / l. After chemical redox and preheating treatment, first adjust the pH of the concentrated solution to 7.5, control its temperature at 25±0.5°C, control the water flow rate at 300L / h, and enter the electrodialysis system. Under the action of 3A DC electric field, the operating pressure is 1.0kg / cm 2 , using a single-stage inverted electrodialysis system for further concentration tests, using the slurry method perchlorethylene positive membrane (DS-SO2). Every 15 to 20 minutes of operation, the polarity of the positive and negative electrodes is reversed, which can automatically clean the dirt formed on the surface o...

Embodiment 3

[0030] Wastewater from a copper smelter, the treatment process is mainly lime neutralization + sulfide precipitation + membrane treatment, nanofiltration and reverse osmosis membrane filtration mixed concentrate, its water quality indicators: Cu: 0.284mg / l, Pb: 0.184mg / l , Zn: 0.1548mg / l, Cd: 0.0427mg / l, As: 0.028mg / l, F: 30.16mg / l, Cl: 5425mg / l, Na: 4152mg / l. After the necessary slag separation, precipitation, flocculation and precipitation treatment, first adjust the pH of the concentrated solution to 8, control its temperature at 25±0.5°C, control the water flow rate at 300L / h, and enter the electrodialysis system. Under the action of a DC electric field of 250V and 3A, the operating pressure is 1.0kg / cm 2 , using a three-stage bipolar membrane electrodialysis system for further concentration tests, using polyethylene heterogeneous ion exchange membranes. Control conditions: (1) Turbidity ≤ 0.3mg / l; (2) Oxygen consumption ≤ 2mg / l; (3) Free chlorine < 0.2mg / l; (4) Iron cont...

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Abstract

The invention relates to an electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate, belongs to the technical field of environment protection and especially relates to treatment of heavy metal contained waste water membrane concentrate from metallurgy and mining industry. The invention has technical characteristics that membrane concentrate from advanced treatment of mining and metallurgy heavy metal contained waste water is collected and enters to an electrodialysis system for further condensation treatment; when reaching a certain condensation multiple, the membrane concentrate enters an efficient evaporation system for treatment. Fresh water generated from electrodialysis and efficient evaporation is collected for reuse or discharge, and generated crystal solid is used for resource integrated utilization or retreatment. The technology is conveniently operated and energy saving, has no environmental pollution, low treatment cost and wide application prospect, and can realize zero discharge of membrane treated strong brine containing heavy metals, so as to truly reach zero discharge of membrane treated waste water containing heavy metals.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the treatment of industrial waste water and high-salinity heavy metal-containing mining and metallurgy wastewater through "membrane advanced treatment", especially the treatment of high-salinity heavy metal-containing mining and metallurgy wastewater. Membrane Concentrate Treatment. Background technique [0002] Heavy metal wastewater refers to industrial wastewater containing a large amount of heavy metals discharged from the production process of metallurgy, mining, electroplating, chemical and other industries. Mainly include mine drainage, waste rock leaching water, mine tailings drainage, non-ferrous metal smelting plant acid production and workshop drainage, non-ferrous metal processing plant pickling wastewater and workshop drainage, electroplating plant electroplating wastewater and workshop drainage, iron and steel plant Pickling drainage, and industrial ...

Claims

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Application Information

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IPC IPC(8): C02F9/06
CPCY02W10/37
Inventor 徐晓军施国飞陈晓鸿黄昌元黄卫忠韦建初刘宇奇聂磊安正阳
Owner KUNMING UNIV OF SCI & TECH
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