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Treatment method of heavy metal wastewater

A treatment method and heavy metal technology, applied in multi-stage water treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc. It is easy to produce hazardous solid waste and other problems, and achieves the effect of saving the amount of chemicals, occupying a small area, and closely arranging the equipment

Active Publication Date: 2018-02-16
SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION +1
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  • Summary
  • 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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  • Treatment method of heavy metal wastewater
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Experimental program
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Effect test

Embodiment 1

[0045] (1) adding a concentration of 10wt% potassium hydroxide solution into the heavy metal wastewater to be treated for stirring and neutralization until the pH value of the heavy metal wastewater is 7;

[0046] (2) be 500:1 by the volume ratio of heavy metal waste water and coagulant agent, in the heavy metal waste water after step (1) process, add the polyferric sulfate solution of mass concentration 0.8%, and stir 8min, make the heavy metal in waste water Ions form hydroxides, precipitate and fold out to become colloidal suspended solids in water;

[0047] (3) According to the solid-liquid ratio mg / L of the magnetic agent and the heavy metal wastewater, the magnetic agent is added to make the colloidal suspended matter in the wastewater water body slightly magnetic;

[0048] Wherein, the magnetic medicament is obtained through the following steps:

[0049] a. Grinding iron ore to nano-scale microspheres of 1-500nm;

[0050] B, the nano microsphere of step a is dispersed...

Embodiment 2

[0060] (1) adding a concentration of 30wt% sodium hydroxide solution into the heavy metal wastewater to be treated for stirring neutralization reaction until the pH value of the heavy metal wastewater is 7;

[0061] (2) be 500:2 by the volume ratio of heavy metal waste water and coagulation agent, add the polyferric sulfate solution of mass concentration 0.7% in the heavy metal waste water after step (1) treatment, and stir 5min, make the heavy metal in waste water Ions form hydroxides, precipitate and fold out to become colloidal suspended solids in water;

[0062] (3) According to the solid-to-liquid ratio mg / L of the magnetic agent and the heavy metal wastewater, the magnetic agent is added to make the colloidal suspension in the wastewater body slightly magnetic;

[0063] Wherein, the magnetic medicament is obtained through the following steps:

[0064] a. Grinding iron ore to nano-scale microspheres of 1-500nm;

[0065] b. Disperse the nanospheres of step a in a mixed sol...

Embodiment 3

[0075] (1) adding a concentration of 40wt% sodium hydroxide solution into the heavy metal wastewater to be treated for stirring neutralization reaction until the pH value of the heavy metal wastewater is 7;

[0076] (2) be 500:1.5 by the volume ratio of heavy metal waste water and coagulation agent, add the polyferric sulfate solution of mass concentration 0.6% in the heavy metal waste water after step (1) treatment, and stir 10min, make the heavy metal in waste water Ions form hydroxides, precipitate and fold out to become colloidal suspended solids in water;

[0077] (3) According to the solid-to-liquid ratio mg / L of the magnetic agent and the heavy metal wastewater, the magnetic agent is added to make the colloidal suspended matter in the wastewater water body slightly magnetic;

[0078] Wherein, the magnetic medicament is obtained through the following steps:

[0079] a. Grinding iron ore to nano-scale microspheres of 1-500nm;

[0080] B, the nano microsphere of step a i...

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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 in particular relates to a treatment method for heavy metal wastewater. Background technique [0002] Enterprises that produce non-ferrous metals have wastewater discharges in the entire production process from mining, mineral processing, smelting to product processing. According to the source of wastewater, it can be divided into mining wastewater, mineral processing wastewater, smelting wastewater and processing wastewater. These wastewater mainly contain antimony, Heavy metal elements such as copper, lead, zinc, cadmium, arsenic, and chromium, if not handled properly, will easily cause arsenic pollution, cadmium pollution, lead pollution and other heavy metal pollution events that have a major impact on the ecological environment. Due to the high acidity, complex types of heavy metal ions, and the existence of various valence states and forms, this type of wastewater is diffic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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