Method for completely recycling wastewater containing fluorine and ammonia nitrogen in electronic industry

An ammonia nitrogen wastewater, electronic industry technology, applied in general water supply conservation, chemical instruments and methods, water pollutants and other directions, can solve problems such as inability to effectively reduce pollutant discharge, eutrophication of discharged water bodies, and reduction of wastewater discharge, etc. Achieve stable and good treatment effect, reduce ammonia nitrogen content and reduce emissions

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 completely recycling wastewater containing fluorine and ammonia nitrogen in electronic industry
  • Method for completely recycling wastewater containing fluorine and ammonia nitrogen in electronic industry
  • Method for completely recycling wastewater containing fluorine and ammonia nitrogen in electronic industry

Examples

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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, ultrafiltration membrane equipment, cleaning-resi...

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

[0060] 25mg / L

32mg / L

50mg / L

0.50

50mg / L

50mg / L

4.8mg / L

2000mg / L

6～9

[0061]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 pr...

Embodiment 3

[0066] 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.

[0067] Table 3-1 Contents of main pollutants in wastewater containing fluorine and ammonia nitrogen

[0068] 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

[0069] 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:...

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Abstract

The invention relates to a method for completely recycling wastewater containing fluorine and ammonia nitrogen in an electronic industry. By the method, the wastewater passes through a 'three plants-in-one' integrated device formed by serially connecting a wastewater treatment plant treatment process, a tap water plant treatment process and a pure water treatment plant treatment process in turn to obtain recycled water. Devices of the wastewater treatment plant treatment process comprise a regulation tank, a reaction tank and a clarification tank; devices of the tap water plant treatment process comprise a quartz sand filter tank, an ozone contact tank and an activated carbon filter tank; and devices of the pure water treatment plant treatment process comprise ultrafiltration membrane equipment, washable reverse osmosis membrane equipment, reverse osmosis membrane concentration equipment and an evaporation system. By the method, the wastewater can be completely recycled, the water quality of the recycled water has high stability, and achieves and is superior to main indicators of GB5749-2006 'Sanitary Standard for Drinking Water' issued by the nation, and the recycled water can serve as primary pure water used in industrial production.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, in particular to a method for regenerating and reusing all 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 s...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/14C02F1/52C02F1/76C02F1/44
CPCY02A20/131
Inventor 陈晓冬
Owner WUXI DEPPEL WATER INVESTMENT
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