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A treatment method for fluorine-containing wastewater

A treatment method and waste water technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve slow reaction rate, poor fluoride ion removal effect, poor sedimentation performance, etc. problem, to achieve the effect of effective removal

Inactive Publication Date: 2017-08-11
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, calcium hydroxide is added to fluoride-containing wastewater to convert fluoride ions into calcium fluoride precipitates, but because the reaction rate between calcium hydroxide and fluoride ions is slow, and the resulting precipitate has poor settling performance, this method is not suitable for wastewater The removal effect of fluoride ion is poor

Method used

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  • A treatment method for fluorine-containing wastewater
  • A treatment method for fluorine-containing wastewater
  • A treatment method for fluorine-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Mix 3 tons of fluorine-containing wastewater with 1 ton of waste phosphating solution. Wherein, the all-directional indicators of the fluorine-containing wastewater are shown in Table 1; the all-directional indicators of the waste phosphating solution are shown in Table 2.

[0049] Raw water index of fluorine-containing wastewater in Table 1 Example 1

[0050] project Fluoride ion COD pH

[0051] mg / L mg / L concentration 6357.71 131920 10.56

[0052] Raw water index of waste phosphating solution in table 2 embodiment 1

[0053]

[0054] After the fluorine-containing wastewater and the waste phosphating solution are mixed evenly, first add calcium hydroxide to it, the addition amount is 26kg / ton of mixed wastewater, and then adjust the pH value of the wastewater to 8-9.

[0055] The above wastewater was reacted under stirring conditions for 3-5 minutes, and then stood still for 30 minutes to obtain a clear and transpare...

Embodiment 2

[0060] Mix 3 tons of fluorine-containing wastewater with 1 ton of waste phosphating solution. Wherein, the all-directional indicators of the fluorine-containing wastewater are shown in Table 4; the all-directional indicators of the waste phosphating solution are shown in Table 5.

[0061] The raw water index of fluorine-containing waste water in the embodiment 2 of table 4

[0062]

[0063] Raw water index of waste phosphating solution in table 5 embodiment 2

[0064]

[0065] After the fluorine-containing waste water and the waste phosphating solution are mixed evenly, add calcium chloride to it at a rate of 38 kg per ton of mixed waste water, and then adjust the pH value of the waste water to 8-9.

[0066] The above wastewater was reacted under stirring conditions for 3-5 minutes, and then stood still for 30 minutes to obtain a clear and transparent supernatant and precipitate. The precipitate was removed to obtain 3.6 tons of treated waste water. The treated wastew...

Embodiment 3

[0071] Add 4 kg of potassium dihydrogen phosphate, 1 kg of nickel sulfate, and 104 kg of calcium hydroxide to 3 tons of fluorine-containing wastewater, and then adjust the pH value of the wastewater to 8-9.

[0072] The above wastewater was reacted under stirring conditions for 3-5 minutes, and then stood still for 30 minutes to obtain a clear and transparent supernatant and precipitate. The precipitate was removed to obtain 2.7 tons of treated waste water.

[0073] The all-directional indicators of the fluorine-containing wastewater are shown in Table 7:

[0074] Raw water index of fluorine-containing waste water in table 7 embodiment 3

[0075]

[0076] The treated wastewater was tested, and the results are shown in Table 8:

[0077] The index of waste water after treatment in the embodiment 3 of table 8

[0078]

[0079] It can be seen from Table 8 that the treated wastewater meets the secondary discharge standard for industrial wastewater.

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Abstract

The invention belongs to the field of wastewater treatment, and in particular relates to a fluorine-containing wastewater treatment method. The fluorine-containing wastewater treatment method provided by the invention comprises the following steps of (a), mixing fluorine-containing wastewater, a phosphoric acid sourced compound, a calcium sourced compound with a transition metal sourced compound to obtain a mixed system, wherein the transition metal sourced compound is one or more of a nickel sourced compound, an iron sourced compound, a zinc sourced compound and a manganese sourced compound; and (b), reacting under alkali conditions, and carrying out solid-liquid separation of the obtained reaction solution so as to obtain treated wastewater. Experimental results show that the removing rate of fluorine ions in the wastewater is more than 99.9% when the fluorine-containing wastewater is treated through the method provided by the invention; the fluorine ion concentration of the treated wastewater is less than 6mg / L which achieves the second-stage industrial wastewater discharge standard.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a treatment method for fluorine-containing waste water. Background technique [0002] Fluorine mainly exists in fluorite, fluoroapatite, and cryolite, which are important chemical raw materials and are widely used in aluminum smelting, phosphate fertilizers, steel, organic synthetic chemicals, electronics industry, atomic energy industry, and organic fluorine advanced lubricants, Industrial production of oxygen difluoride, hydrazine fluoride, and fluorine refrigerants for rocket propellants. A large amount of fluorine-containing wastewater is discharged in the above-mentioned industrial production, which pollutes the environment. According to the national "Comprehensive Wastewater Discharge Standard" (GB8978-1996), the fluoride ion concentration in the primary standard should be less than 10mg / L, and the maximum allowable concentration of fluorine in surface water is 1.0mg / L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/14
Inventor 施云芬王旭辉朱昭陈玉新
Owner NORTHEAST DIANLI UNIVERSITY