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Treatment process for fluorine chemical wastewater

A technology of chemical wastewater and treatment process, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc. Good for pretreatment and other issues, to achieve the effect of shortening the precipitation time, increasing the processing capacity, and saving the cost of chemical addition

Active Publication Date: 2015-05-20
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) For the inorganic fluoride ion treatment technology dominated by calcium salt precipitation, since the calcium fluoride precipitation nucleus produced during the treatment process is extremely small, especially for wastewater with high inorganic fluoride ions, it is easy to form latex-like precipitates. The precipitation speed is extremely slow, which affects the efficiency of the entire treatment process
[0006] (2) For inorganic fluoride ions to meet the standard, the current process often uses a large amount of excess calcium salt to precipitate and remove fluoride ions from wastewater, and the dosage is rarely quantified according to the actual fluoride ion content of wastewater. The waste of calcium salt reagents is poor in economy. In addition, the more important thing is that the excess calcium salt dosage greatly increases the salinity of wastewater, making the biochemical treatment of fluorine chemical wastewater with relatively high salinity more difficult.
[0007] (3) Since the crystal nuclei of calcium fluoride precipitation are very small, for wastewater with low concentration of inorganic fluoride ions, the amount of calcium fluoride precipitation produced when calcium salt is initially added is very small, and the crystal nuclei and flocs are extremely small. The current treatment process In the middle, it is mainly through adding a large amount of calcium salt, and the dosage can even reach hundreds or thousands of times the theoretical dosage to make the wastewater inorganic fluoride ion reach the standard, which also brings about the economical problem of waste of chemicals and the increase of wastewater salinity The problem
[0008] (4) The main reason why organic fluorine in fluorine chemical wastewater is difficult to biodegrade is because C-F in organic matter is very stable, and current research has shown that it is difficult to interrupt C-F in a simple anaerobic treatment system, so the hydrolysis and acidification process is harmful to organic matter. Fluorine does not have a good pretreatment effect, which directly leads to the fact that the COD of fluorine chemical wastewater is still difficult to meet the standard after the current biochemical treatment process

Method used

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  • Treatment process for fluorine chemical wastewater
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  • Treatment process for fluorine chemical wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) The wastewater is pumped to the iron-carbon reaction tank, stirred with compressed air in the iron-carbon tank, and industrial waste acid or waste alkali is added through the online pH control dosing pump to maintain the pH value of the reaction in the tank; the iron-carbon reaction tank is laid Iron-carbon filler, the Fe / C of iron-carbon filler is 1:1; the liquid-solid volume ratio of iron-carbon filler to wastewater is 10:1; the hydraulic retention time of iron-carbon reaction tank is 4h;

[0061] (2) After the reaction, the wastewater flows to the iron-carbon sedimentation tank by itself, and the pH value of the wastewater is adjusted for flocculation and sedimentation. The precipitated sludge enters the sludge thickening tank to concentrate and then is filtered to remove water; the sedimentation time of the iron-carbon sedimentation tank is 1h;

[0062] (3) The supernatant of the precipitated wastewater in the iron-carbon sedimentation tank overflows to the first...

Embodiment 2

[0071] (1) The wastewater from the fluorine chemical industry enters the first-level adjustment pool for pH adjustment, and the low-concentration fluorine chemical wastewater in Table 2 is used for adjustment. The raw water and the low-concentration fluorine chemical wastewater are diluted and adjusted at a volume ratio of 1:4, and the pH of the wastewater is adjusted. value;

[0072] (2) The adjusted wastewater is pumped to the iron-carbon reaction tank, stirred with compressed air in the iron-carbon tank, and industrial waste acid or alkali is added through the online pH control dosing pump to maintain the pH value of the reaction in the tank; The iron-carbon filler is laid in the carbon reaction tank, and the Fe / C of the iron-carbon filler is 1:1; the liquid-solid volume ratio of the iron-carbon filler to the waste water is 10:1; the hydraulic retention time of the iron-carbon reaction tank is 5h; (3) Reaction Finally, the wastewater flows to the iron-carbon radial flow sed...

Embodiment 3

[0084] (1) The wastewater enters the first-level adjustment tank for pH adjustment, and the low-concentration fluorine chemical wastewater in Table 2 is used for adjustment, and the raw water and the low-concentration fluorine chemical wastewater are diluted and adjusted at a volume ratio of 1:9, and the pH value of the wastewater is adjusted;

[0085] (2) The adjusted wastewater is pumped to the iron-carbon reaction tank, stirred with compressed air in the iron-carbon tank, and industrial waste acid or waste alkali is added through the online pH control dosing pump to maintain the pH value of the reaction in the tank; The iron-carbon filler is laid in the reaction tank, and the Fe / C of the iron-carbon filler is 1:1; the liquid-solid volume ratio of the iron-carbon filler to the waste water is 10:1; the hydraulic retention time of the iron-carbon reaction tank is 6h;

[0086] (3) After the reaction, the wastewater flows to the iron-carbon radial flow sedimentation tank by itsel...

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Abstract

The invention discloses a treatment process for fluorine chemical wastewater. The process comprises the following steps: sequentially carrying out one-time regulating, carrying out iron-carbon reaction pre-treatment, carrying out iron-carbon precipitation, carrying out one-time calcium salt reaction, carrying out one-time calcium salt precipitation, adjusting for the second time, carrying out bioelectrocatalysis, carrying out an aerobic contact oxidation, carrying out second-time calcium salt reaction, second-time precipitation and discharging water. The process provided by the invention is used for treating the fluorine chemical wastewater; the wastewater treated by the process can achieve primary standards of Integrated Wastewater Discharge Standard (GB8978-1996) and the operation cost of wastewater treatment is low.

Description

technical field [0001] The invention relates to a process for treating chemical waste water, in particular to a process for treating fluorine chemical waste water. Background technique [0002] As a special material, organic fluoride has excellent properties and has been widely used in the preparation process of surfactants, flame retardants, refrigerants, pesticides, adhesives, medicines, etc. in recent years, which directly promotes the development of organic fluorine. With the rapid development of the industry, the discharge of fluorine chemical wastewater continues to increase. Inorganic fluoride ions in fluorine chemical wastewater enter the human body and can cause harm to multiple tissues such as human liver and kidney through cell transport; [0003] The organic fluorine pollutants in fluorine chemical wastewater have teratogenic, carcinogenic and mutagenic properties, and some fluorinated aromatic hydrocarbons have been proposed as new POPs, so fluorine chemical wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/14C02F101/36
Inventor 冯华军张学勤沈东升汪美贞梁禹翔谢春言刘阳
Owner ZHEJIANG GONGSHANG UNIVERSITY
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