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Method for processing waste water containing heavy metals by utilizing internal electrolysis-electrolysis method

An electrolytic treatment and heavy metal technology, which is applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Improved processing efficiency, reduced operating costs, and increased reaction rates

Inactive Publication Date: 2011-02-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrolysis method has the advantages of short reaction time, simple process, and good treatment effect, but there are problems such as high energy consumption, large electrode consumption and high treatment cost.
[0005] Therefore, although these two electrochemical methods have been widely studied, their practical application in the treatment of heavy metal wastewater, especially wastewater containing complex heavy metal ions, has been limited due to their own shortcomings.

Method used

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  • Method for processing waste water containing heavy metals by utilizing internal electrolysis-electrolysis method
  • Method for processing waste water containing heavy metals by utilizing internal electrolysis-electrolysis method
  • Method for processing waste water containing heavy metals by utilizing internal electrolysis-electrolysis method

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1: as figure 1It is the treatment process of the internal electrolysis-electrolysis treatment process scheme for the treatment of smelting wastewater. The acidic heavy metal-containing wastewater (pH: 2.11) in the smelting workshop is added with alkali (lime) to make the pH rise to 2.5, and the wastewater from the neutralization sedimentation tank enters the iron-carbon micro-electrolysis equipment with a hydraulic retention and aeration time of 30mi; then enters the sedimentation pool, the pH of the supernatant after self-flocculation reaches 5.5, in which a large amount of metal ions such as zinc, cadmium, arsenic, and lead are oxidized into metal atoms, a large amount of fluorine and other impurities are removed, and the supernatant directly enters the electrolysis device , the hydraulic retention time is 15min, the metal ions in the sewage are basically removed, and the sewage after electrolysis enters the sedimentation tank (the pH of the electrolysis wa...

Embodiment 2

[0028] Embodiment 2: as figure 2 It is a treatment process for internal electrolysis_electrolysis to treat electroplating acid wastewater. Electroplating acid wastewater (PH: 2.6) is collected and precipitated by the sedimentation tank and directly enters the iron-carbon micro-electrolysis equipment. The hydraulic retention time is 30 minutes, and then enters the sedimentation tank. Metal ions such as zinc, chromium, nickel, cadmium, arsenic, and lead are oxidized into metal atoms, and a large amount of fluorine and other impurities are removed. The supernatant can directly enter the electrolysis device, and the hydraulic retention time is 15 minutes. The metal ions in the sewage are basically The above is removed, and the sewage after electrolysis enters the sedimentation tank (adding alkali appropriately to make the pH rise to 9, adding flocculant appropriately), and the metal ions in the supernatant can reach the third-class standard of surface water. The supernatant ente...

Embodiment 3

[0033] Embodiment 3: as figure 1 It is the treatment process of the internal electrolysis-electrolysis treatment process plan for the treatment of acidic wastewater in mines. Add alkali (lime) to the heavy metal-containing acidic wastewater (pH: 1.65) of mineral processing to make the pH rise to 2.5, and the wastewater from the neutralization and sedimentation tank enters the iron-carbon micro-electrolysis equipment, and the hydraulic retention and aeration time is 30 minutes; after that, it enters the sedimentation pool, the pH of the supernatant after self-flocculation reaches 5.3, in which a large amount of metal ions such as zinc, cadmium, arsenic, and lead are oxidized into metal atoms, a large amount of fluorine and other impurities are removed, and the supernatant directly enters the electrolysis device , the hydraulic retention time is 15min, the metal ions in the sewage are basically removed, and the sewage after electrolysis enters the sedimentation tank (the pH of t...

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Abstract

The invention discloses a method for processing waste water containing heavy metals by utilizing an internal electrolysis-electrolysis method, which is characterized in that the waste water meeting the requirements of microelectrolysis processing is microelectrolyzed; the waste water is electrolyzed after the microelectrolysis reaches to the requirements thereof in a certain time so as to reach effluent standards or the requirements of recycle and the subsequent processing; the microelectrolysis bears a part of the task for processing the waste water containing the heavy metals and plays a preprocessing role of the electrolysis method; and the electrolysis method bears the remaining task for processing the rest waste water containing the heavy metals and plays the postprocessing role of the microelectrolysis. The invention organically integrates the microelectrolysis method and the electrolysis method, the two methods cooperate with each other and play roles together, and the processing method has the advantages of simple technique, processing efficiency enhancement of the waste water containing the heavy metals, and processing cost reduction.

Description

technical field [0001] The invention belongs to the field of environmental science and technology, mainly relates to the technical field of heavy metal wastewater treatment, and specifically refers to a composite treatment method for treating wastewater containing heavy metals by applying internal electrolysis and electrolysis technology in series, and is especially suitable for the treatment of wastewater containing complex heavy metals. Background technique [0002] Heavy metal wastewater refers to industrial wastewater containing a large amount of heavy metals discharged from industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, and instrumentation. Heavy metal (such as cadmium, copper, mercury, zinc, etc.) wastewater is one of the most serious environmental pollution and the greatest harm to human industrial wastewater. Heavy metals in wastewater generally cannot be decomposed and destroyed, but can only t...

Claims

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Application Information

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IPC IPC(8): C02F101/20C02F9/06C02F1/461
Inventor 徐晓军杨津津王刚王盼刘宇奇陈法涛陈宁范领东韩振宇
Owner KUNMING UNIV OF SCI & TECH
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