Fluorine-containing wastewater treatment method

A treatment method and wastewater technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem that the total nitrogen of the sewage plant in the park cannot meet the standard, cannot remove the total nitrogen, and denitrifying bacteria Poisoning and other problems, to achieve the effect of saving chemical costs and sludge disposal costs, low cost, and fast settlement speed

Inactive Publication Date: 2020-08-25
XINJIANG ENVIRONMENTAL ENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the "three simultaneous" principle, the sewage treatment plant should also be constructed at the same time as the construction of the park. However, since the industrial enterprises have not moved in at this time, the designers do not know enough about the wastewater discharged by each enterprise, so they only adopt general indicators for the sewage treatment plant. When there are photovoltaic enterprises in the park, the total nitrogen of the sewage plant in the park often fails to meet the standard, and the total nitrogen cannot be removed even if denitrifying bacteria are added. , causing irreversible toxic effects on denitrifying bacteria, unable to reduce the total nitrogen through biological methods, causing the total nitrogen in the effluent of the sewage plant to be almost the same as the total nitrogen in the influent, and the removal rate of total nitrogen is almost zero. Once the denitrifying bacteria are poisoned, Even if the concentration of fluorine ion in the upstream enterprise's fluorine-containing wastewater is less than 10mg / L in the later period, the total nitrogen still has no treatment efficiency, and it is necessary to re-cultivate microorganisms and debug the operation of the biochemical pool. The operation is complicated and the cost is high.

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  • Fluorine-containing wastewater treatment method
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Effect test

Embodiment 1

[0024] The treatment method of fluorine-containing wastewater includes the following steps:

[0025] Step A, adding lime aqueous solution (the mass concentration of lime aqueous solution is 50wt%) to the raw water until the pH value is adjusted to 8-9, and reacting for 20 minutes;

[0026] Step B, add aluminum sulfate to the mixed solution in step A, add the amount according to the data in Table 1 below, and adjust the pH value to 10-11, and react for 5 minutes;

[0027] Step C, add polyacrylamide solution to the mixed solution in step B, the amount of polyacrylamide added is 1ppm, and react for 5min;

[0028] In step D, the mixed solution in step C is flowed into a sedimentation tank for solid-liquid separation, and the separated supernatant is treated wastewater.

[0029] For the fluoride ion concentration after removal of 1-12 fluorine-containing wastewater samples, and the fluoride ion concentration of raw water, the test results are shown in Table 1:

[0030] Table 1 Te...

Embodiment 2

[0040] The treatment method of fluorine-containing wastewater includes the following steps:

[0041] Step A, adding lime aqueous solution (mass concentration of lime aqueous solution is 50wt%) to the raw water until the pH value is 8-9, and reacting for 10 minutes;

[0042] Step B, adding aluminum sulfate to the mixed solution in step A, the addition amount is to add 25ppm aluminum sulfate solution per liter of raw water (the mass concentration of aluminum sulfate solution is 50wt%), and adjust the pH value to 10-11, and react for 10 minutes;

[0043]Step C, adding polyacrylamide solution (the mass concentration of polyacrylamide solution is 50wt%) to the mixed solution in step B, the amount of polyacrylamide added is 2ppm, and react for 2min;

[0044] In step D, the mixed solution in step C is flowed into a sedimentation tank for solid-liquid separation, and the separated supernatant is treated wastewater.

Embodiment 3

[0046] The treatment method of fluorine-containing wastewater includes the following steps:

[0047] Step A, adding lime aqueous solution (the mass concentration of lime aqueous solution is 50wt%) to the raw water until the pH value is 8-9, and reacting for 30 minutes;

[0048] Step B, adding aluminum sulfate to the mixed solution in step A, the amount of addition is to add 40ppm aluminum sulfate solution per liter of raw water (the mass concentration of aluminum sulfate solution is 50wt%), and adjust the pH value to 10-11, and react for 2 minutes;

[0049] Step C, adding polyacrylamide solution (the mass concentration of polyacrylamide solution is 50wt%) to the mixed solution in step B, the amount of polyacrylamide added is 1.5ppm, and react for 10min;

[0050] In step D, the mixed solution in step C is flowed into a sedimentation tank for solid-liquid separation, and the separated supernatant is treated wastewater.

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Abstract

The invention provides a fluorine-containing wastewater treatment method, which comprises: adding lime to fluorine-containing wastewater to adjust the pH value to 8-9, carrying out a reaction, continuously adding aluminum sulfate to adjust the pH value to 10-11, carrying out a reaction, finally adding polyacrylamide, carrying out a reaction, and carrying out precipitation separation to obtain supernatant. The content of fluorine ions in water treated by the fluorine-containing wastewater treatment method reaches 5 mg / L or below, and up-to-standard discharge of total nitrogen in effluent of a sewage plant can be realized.

Description

technical field [0001] The invention relates to the field of fluorine-containing wastewater treatment, in particular to a treatment method for fluorine-containing wastewater. Background technique [0002] With the continuous development and progress of industry, industrial parks, as the new focus of regional economic development, have sprung up like mushrooms after rain. Many industrial parks have achieved economic benefits and even become regional image projects. All provinces, most cities and even some counties in China have started to build their own industrial parks. Since the construction of my country's industrial parks started late and the construction experience is not very rich, behind the rapid development of my country's industrial parks, some problems have also emerged. For example, the wastewater treatment of sewage plants in industrial parks containing photovoltaic enterprises is not up to standard. [0003] At present, the wastewater in industrial parks is g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/56C02F101/14
CPCC02F1/56C02F1/66C02F1/5236C02F2101/14C02F2001/007
Inventor 单琦艾山·玉素莆李红丽于文浩
Owner XINJIANG ENVIRONMENTAL ENG TECH
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