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Treatment method of heavy metal waste water

A treatment method and technology for heavy metals, which are applied in multi-stage water treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. Continuous extraction of sludge and other problems, to achieve the effect of saving the amount of chemicals, less floor space, and close arrangement of equipment

Active Publication Date: 2016-05-25
SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. This process uses lime as a neutralizing agent, which produces a large amount of sludge. The amount of slag to be processed in the follow-up is large, and it is easy to generate hazardous solid waste. The on-site operating environment is relatively harsh
[0006] 2. The process consumes a lot of electricity and the processing cost is high
[0007] 3. Because the process adopts natural sedimentation, the flocculation and sedimentation time is long, and a large sedimentation tank is required
[0008] 4. The discharge water of this process can only meet the discharge standards of industrial countries, and it is difficult to upgrade to the standard of surface water above Class V
[0009] 5. The process cannot continuously extract sludge

Method used

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Examples

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Effect test

Embodiment 1

[0045] (1) Add a potassium hydroxide solution with a concentration of 10wt% to the heavy metal wastewater to be treated for agitation and neutralization reaction until the pH of the heavy metal wastewater is 7;

[0046] (2) According to the volume ratio of heavy metal wastewater to coagulant of 500:1, add a 0.8% mass concentration of polyferric sulfate solution to the heavy metal wastewater treated in step (1), and stir for 8 minutes to make the heavy metals in the wastewater The ions form hydroxides and precipitate out to become colloidal suspensions in water;

[0047] (3) According to the solid-to-liquid ratio of magnetic agent and heavy metal wastewater in mg / L as 15:1, magnetic agent is added to make the colloidal suspension in the wastewater water have micro-magnetism;

[0048] Among them, the magnetic agent is prepared through the following steps:

[0049] a. Grind iron ore to nano-sized microspheres of 1~500nm;

[0050] b. Disperse the nano-microspheres of step a at 8g / mL in a m...

Embodiment 2

[0060] (1) Add a sodium hydroxide solution with a concentration of 30% by weight to the heavy metal wastewater to be treated for agitation and neutralization reaction until the pH of the heavy metal wastewater is 7;

[0061] (2) According to the volume ratio of heavy metal wastewater to coagulant of 500:2, add a polyferric sulfate solution with a mass concentration of 0.7% to the heavy metal wastewater treated in step (1), and stir for 5 minutes to make the heavy metals in the wastewater The ions form hydroxides and precipitate out to become colloidal suspensions in water;

[0062] (3) According to the solid-to-liquid ratio of magnetic agent and heavy metal wastewater in mg / L, add magnetic agent to make the colloidal suspension in the wastewater have micro-magnetic properties;

[0063] Among them, the magnetic agent is prepared through the following steps:

[0064] a. Grind iron ore to nano-sized microspheres of 1~500nm;

[0065] b. Disperse the nano-microspheres of step a at 1g / mL in ...

Embodiment 3

[0075] (1) Add a sodium hydroxide solution with a concentration of 40% by weight to the heavy metal wastewater to be treated for stirring and neutralization until the pH of the heavy metal wastewater is 7;

[0076] (2) According to the volume ratio of heavy metal wastewater to coagulation agent of 500:1.5, add a 0.6% mass concentration of polyferric sulfate solution to the heavy metal wastewater treated in step (1), and stir for 10 minutes to make the heavy metals in the wastewater The ions form hydroxides and precipitate out to become colloidal suspensions in water;

[0077] (3) According to the solid-to-liquid ratio of magnetic agent and heavy metal wastewater in mg / L as 5:1, magnetic agent is added to make the colloidal suspension in the wastewater water have micro-magnetism;

[0078] Among them, the magnetic agent is prepared through the following steps:

[0079] a. Grind iron ore to nano-sized microspheres of 1~500nm;

[0080] b. Disperse the nano microspheres of step a at 10g / mL ...

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Abstract

The present invention discloses a treatment method of heavy metal waste water. The method is as below: adding an strongly alkali solution in heavy metal waste water to be treated, stirring for a neutralization reaction, then adding a coagulation agent, stirring, adding a magnetic agent and flocculant, stirring, carrying out solid-liquid separation to obtain magnetic-containing sludge and effluent, centrifuging the effluent, and removing solid impurities to obtain treated effluent. The wastewater treated by the present invention has seven indicators of antimony, lead, copper, chromium, arsenic, cadmium and zinc reaching the water pollutant discharge concentration limits for the non-ferrous metallurgical enterprises, and sludge discharge is reduced by 2-4 times; the magnetic agent be recycled by a magnetic recovery system, so as to increase the recovery rate of the magnetic agent. The method realizes a continuous process and automated operation, and reduces the personnel and degree of labor.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment, and specifically relates to a method for treating heavy metal wastewater. Background technique [0002] Enterprises producing non-ferrous metals discharge wastewater during the entire production process from mining, beneficiation, smelting to product processing. According to the source of wastewater, it can be divided into mining wastewater, beneficiation wastewater, smelting wastewater and processing wastewater. These wastewaters mainly contain antimony, Copper, lead, zinc, cadmium, arsenic, chromium and other heavy metal elements, if they are not handled properly, will easily cause arsenic pollution, cadmium pollution, lead pollution and other heavy metal pollution events that have a significant impact on the ecological environment. Due to the high acidity, the complex types of heavy metal ions, and the existence of multiple valence states and forms of this type of wastewater, it is dif...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/20
CPCC02F1/48C02F1/56C02F1/66C02F9/00C02F2101/20C02F2301/08
Inventor 黄付平黄枰覃科文陈志明谢鸿
Owner SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
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