Method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry

A technology for ammonia nitrogen wastewater, electronics industry, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc. and other problems, to achieve stable and good treatment effect, reduce ammonia nitrogen content, and reduce wastewater discharge.

Active Publication Date: 2011-07-20
WUXI DEPPEL WATER INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor biodegradability of this type of wastewater (BOD/COD<0.1), and due to the limitations of the process technology of urban sewage treatment plants, the total nitrogen in the effluent is often not up to the standard, which may easily lead to eutrophication of the discharged water, especially for some specific Pollutants (such as fluorine) cannot be effectively removed but can only be reduced by dilution
Facing the increasingly serious ecological environment, the state requires industrial enterprises to implement the policy

Method used

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  • Method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry
  • Method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry
  • Method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The wastewater containing fluorine and ammonia nitrogen in an electronics industry contains a large amount of pollutants such as fluorine, ammonia nitrogen, organic nitrogen, phosphorus and suspended solids, and the total dissolved solid salt content in the water is relatively high. See Table 1-1 for the specific content of main pollutants in wastewater.

[0033] Table 1-1 Contents of main pollutants in wastewater containing fluorine and ammonia nitrogen

[0034]

Ammonia nitrogen

total nitrogen

Fluoride ion

Ammonia nitrogen / fluoride ion

COD

SS

phosphorus

TDS

pH value

20mg / L

26mg / L

55mg / L

0.36

50mg / L

50mg / L

4.8mg / L

2000mg / L

6～9

[0035] Such as figure 1 As shown, the waste water passes through the adjustment tank, reaction tank, clarification tank and V-shaped quartz sand filter tank, ozone contact tank, activated carbon filter tank, ultr...

Embodiment 2

[0057] The wastewater containing fluorine and ammonia nitrogen in an electronics industry contains a large amount of pollutants such as fluorine, ammonia nitrogen, organic nitrogen, phosphorus and suspended solids, and the total dissolved solid salt content in the water is relatively high. See Table 2-1 for the specific content of main pollutants in wastewater.

[0058] Table 2-1 Contents of main pollutants in wastewater containing fluorine and ammonia nitrogen

[0059] Ammonia nitrogen

total nitrogen

Fluoride ion

Ammonia nitrogen / fluoride ion

COD

SS

phosphorus

TDS

pH value

25mg / L

32mg / L

50mg / L

0.50

50mg / L

50mg / L

4.8mg / L

2000mg / L

6～9

[0060] According to the wastewater treatment method of this embodiment, it is basically the same as that of Example 1, except that there are slight changes in the operation of the ammonia nitrogen removal process and the fluorine removal process, as follows:...

Embodiment 3

[0065] The wastewater containing fluorine and ammonia nitrogen in an electronics industry contains a large amount of pollutants such as fluorine, ammonia nitrogen, organic nitrogen, phosphorus and suspended solids, and the total dissolved solid salt content in the water is relatively high. See Table 3-1 for the specific content of main pollutants in wastewater.

[0066] Table 3-1 Contents of main pollutants in wastewater containing fluorine and ammonia nitrogen

[0067] Ammonia nitrogen

total nitrogen

Fluoride ion

Ammonia nitrogen / fluoride ion

COD

SS

phosphorus

TDS

pH value

35mg / L

43mg / L

37mg / L

0.95

50mg / L

50mg / L

4.8mg / L

2000mg / L

6～9

[0068] According to the wastewater treatment method of this embodiment, it is basically the same as that of Example 1, except that there are slight changes in the operation of the ammonia nitrogen removal process and the fluorine removal process, as follows: f...

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Abstract

The invention relates to a method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry. In the method, waste water passes through a three-in-one integral device formed by the sequential series connection of a waste water treatment plant treating process, a water works treating process and a pure water treatment plant treating process to obtain reclaimed water. The device for implementing the waste water treatment plant treating process comprises a conditioning tank, a reaction tank and a clarifying tank; the device for implementing the water works treating process comprises a quartz sand filter tank, an ozone contact tank and an activated carbon filter tank; and the device for implementing the pure water treatment plant treating process comprises an ultrafiltration membrane device and a cleaning-resistant reverse osmosis membrane device, and thick water produced by the cleaning-resistant reverse osmosis membrane device can be reclaimed or not to obtain the reclaimed water according to the reclamation rate requirement and environmental impact assessment requirement of a reclamation customer. The reclaimed water treated by the invention has stable and favorable quality, meets and surpasses the leading indicators of GB5749-2006 Standards for Drinking Water Quality issued by China, and can be used as primary pure water for industrial production.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a recycling method for waste water containing fluorine and ammonia and nitrogen in the electronics industry. Background technique [0002] With the development of electronic industry technology, especially integrated circuit chip industry technology, the treatment of electronic industrial wastewater, especially electronic industry wastewater containing fluorine and ammonia nitrogen, has become a prominent problem in the water treatment industry. The electronics industry usually uses a large number of chemicals such as hydrofluoric acid, sulfuric acid, phosphoric acid, ammonia water, hydrochloric acid, and organic solvents in the production process, making the discharged wastewater contain a large number of components that pollute the surrounding environment, which has aggravated my country's water pollution. and the severity of the water shortage situatio...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/14C02F1/52C02F1/76
Inventor 陈晓冬
Owner WUXI DEPPEL WATER INVESTMENT
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