A method for treating heavy metal-containing wastewater membrane filtration concentrate

A technology for concentrated liquid and heavy metals, which is applied in the fields of energy and wastewater treatment, chemical instruments and methods, and multi-stage water/sewage treatment. , improve the utilization rate, the effect of less environmental pollution

Inactive Publication Date: 2011-11-30
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Multi-effect evaporation saves energy consumption, but reduces the pr

Method used

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  • A method for treating heavy metal-containing wastewater membrane filtration concentrate
  • A method for treating heavy metal-containing wastewater membrane filtration concentrate

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Experimental program
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Effect test

Embodiment 1

[0024] Wastewater from a lead-zinc smelter, the treatment process is mainly lime (stone) neutralization + oxidation flocculation + membrane treatment, the reverse osmosis membrane filters the concentrated solution, and its water quality indicators: Pb: 0.4774mg / l, Zn: 0.0402mg / l , Cd: 0.1898 mg / l, As: 0.015 mg / l, F: 42.09 mg / l, Cl: 11316 mg / l, Na: 8759 mg / l. Direct contact membrane distillation is used for treatment, and polyvinylidene fluoride (PVDF) microporous membrane is used to control the temperature of the hot side at 60°C and the temperature of the cold side at 10°C. Pickling is used to prevent membrane pollution. The desalination rate of the effluent water quality index at this time At 99.1%, the interception rate of heavy metals is also above 99%. The remaining waste water is concentrated twice by the direct contact membrane distillation method and then treated by a three-effect evaporator to recover salt and useful substances by evaporation and crystallization; the ...

Embodiment 2

[0026]The wastewater from a lead-zinc smelter is mainly treated by lime (stone) neutralization + oxidation flocculation + electrochemical + membrane treatment, and the concentrated solution is filtered by nanofiltration membrane. The water quality indicators: Pb: 0.384mg / l, Zn: 0.0848 mg / l, Cd: 0.0347 mg / l, As: 0.018 mg / l, F: 34.16 mg / l, Cl: 7425 mg / l, Na: 5152 mg / l. Air-gap membrane distillation is used for treatment. Polypropylene (PP) microporous membrane is used to control the temperature of the hot side at 80°C and the temperature of the cold side at 20°C. Backwashing is used to prevent membrane fouling. The desalination rate of the effluent water quality at this time is at 99.3%, the interception rate of heavy metals is also above 99%. After being concentrated 5 times by the air-gap membrane distillation method, the remaining wastewater is treated by a three-effect evaporator, and salt and useful substances are recovered by evaporation and crystallization; the steam cool...

Embodiment 3

[0028] 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. The vacuum membrane distillation method was used for the test, and the polypropylene (PP) microporous membrane was used to control the temperature of the hot side at 90°C, the temperature of the cold side at 10°C, and the vacuum degree of the cold side at 0.15MPa. Ultrasonic cleaning was used to prevent membrane pollution. The desalination rate is 99.6%, and the interception rate of heavy metals is also above 99%. After being concentrated 10 times by the vacuum membrane distillation method, the remaining wastewater is treated by a three-effect evaporator, and salt and useful substances are recovered by evaporation and cr...

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Abstract

The invention proposes a treatment method for a heavy-metal-containing wastewater membrane concentrated liquid, relates to the technical field of environmental protection and particularly relates to the treatment of the heavy-metal-containing wastewater membrane concentrated liquid in metallurgy and mining industries. The treatment method comprises: after collecting the heavy-metal-containing wastewater membrane concentrated liquid, introducing into a membrane distillation system for recycling, and introducing the concentrated liquid to an efficient evaporation system when a certain concentration ratio is reached; and collecting fresh water generated by the membrane distillation system and efficient evaporation system for reuse, and comprehensively utilizing or retreating a produced crystalline solid. The treatment method provided by the invention is convenient for operation and energy-saving, and has the advantages of less environmental pollution, lower treatment cost and wide application prospects, the occupied space in the treatment method is small, and zero emission of the heavy-metal-containing wastewater membrane concentrated liquid can be realized, thus truly realizing the zero emission of the treatment of the heavy-metal-containing wastewater.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to the treatment of the membrane concentrate produced by "membrane advanced treatment" of heavy metal-containing wastewater, especially the treatment of the membrane concentrate of heavy metal-containing wastewater in the metallurgical and mining industries. Background technique [0002] Metallurgy, mining, electroplating, chemical and other industries will produce a large amount of wastewater containing heavy metals in the production process, mainly including mine drainage, leaching water from waste rock yards, tailings drainage from ore dressing plants, acid production and workshop drainage from nonferrous metal smelters, nonferrous metal smelters, etc. Pickling wastewater and workshop drainage of metal processing plants, plating wastewater and workshop drainage of electroplating plants, pickling wastewater of iron and steel plants, and industrial wastewater contai...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCY02W10/33Y02W10/37
Inventor 徐晓军陈晓鸿施国飞黄伟忠黄昌元韦建初管堂珍杨津津马玲郑鑫
Owner KUNMING UNIV OF SCI & TECH
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