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Advanced treatment method for cyanide and fluoride composite polluted wastewater

A complex pollution and advanced treatment technology, applied in water/sewage treatment, special compound water treatment, water/sewage multi-stage treatment, etc. Sludge production, sludge reduction, and residual reduction effects

Active Publication Date: 2020-04-17
HANGZHOU XINGYUAN FILTER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the reverse osmosis method is expensive and has strict requirements on the water quality of the raw water; the electrodialysis method has strict requirements on the water quality and requires pretreatment of the raw water, which is expensive in treatment costs and requires a large investment in equipment. Difficult to industrialize
The most commonly used methods are chemical precipitation and flocculation precipitation. However, after the traditional precipitation method is treated with lime, the fluorine content in the water will still be 20-30mg / l, while the adsorption method can treat the fluorine content to 10mg / l. Below l, but the processing efficiency is low and the processing time is long
Therefore, it is urgent to provide a treatment method to solve the common problems in the current coking industry, such as difficulty in meeting the standards of cyanide and fluoride in the effluent, and high cost

Method used

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  • Advanced treatment method for cyanide and fluoride composite polluted wastewater
  • Advanced treatment method for cyanide and fluoride composite polluted wastewater

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preparation example Construction

[0045] Preparation of modified chitosan: Dissolve chitosan in 1% acetic acid solution to obtain 2wt% chitosan solution, stir for 12-15h, add 0.05g / ml ammonium persulfate solution of 0.001 times the mass of chitosan , and then drop polydimethyldiallylammonium chloride equal to chitosan quality at a rate of 1d / s, and stir for 24-30h. After the reaction is completed, the reactant is dialyzed with distilled water for 24h, and then carried out with anhydrous acetone. Precipitate, and then centrifuge to obtain the precipitate and soak it in absolute ethanol for 5 minutes, filter and dry to obtain modified chitosan.

[0046] Coating: Dissolve n-tetrabutyl titanate in absolute ethanol, stir and mix evenly, then add tetraethyl orthosilicate dropwise at a speed of 30-35d / min, in which absolute ethanol, n-tetrabutyl titanate, orthosilicon The molar ratio of ethyl acetate is 6:3:1. After the dropwise addition, stir at a speed of 800-850rpm for 1 hour to obtain solution A; add hexadecylpyr...

Embodiment 1

[0050] The present invention is a method for advanced treatment of cyanofluorine compound polluted wastewater. The specific treatment steps for treating cyanofluorine compound polluted wastewater are as follows:

[0051] 1) Put the biochemically treated waste water into the oxidative cyanide breaking tank, add sulfuric acid to adjust the pH value to 4.5-5, the sulfuric acid can be used with any concentration of sulfuric acid, and in this embodiment, the concentrated sulfuric acid with a concentration of 98% is selected for pH adjustment. Then according to 1700-1750mg / L, this embodiment chooses to add ferrous sulfate with a feed rate of 1700mg / L, after stirring for 15-18min, according to 500-550mg / L, this embodiment chooses to add hydrogen peroxide with a feed rate of 500mg / L , according to 100-120mg / L, preferably 100mg / L, add copper sulfate, continue to stir and react for 2-2.5h, add liquid caustic soda to adjust the pH value to 6.5-7, and finally according to 1-3mg / L, this emb...

Embodiment 2

[0058] Compared with implementation one, this embodiment is different in that in step 6) of this embodiment, after the wastewater in the secondary defluoridation tank is poured into the secondary sedimentation tank, according to 2-5mg / L, this implementation For example, choose to add the precipitating agent at the dosage of 3mg / L.

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Abstract

The invention discloses an advanced treatment method for cyanide and fluoride composite polluted wastewater, and relates to the technical field of wastewater treatment. The method comprises the following steps: performing oxidation cyanide-breaking treatment on the wastewater by using a Fenton reagent and copper sulfate to remove COD and cyanides in the wastewater, adopting a two-stage precipitation process, adding PAC and lime into a primary defluorination tank to make F<-> in the wastewater form an insoluble fluorine-aluminum-calcium composite precipitate, then adding PAM to carry out precipitation separation in the primary precipitation tank, then adding polyaluminum sulfate chloride into a secondary defluorination tank to form aluminum fluoride micro-flocs together with the remaining F<-> in the wastewater, and then adding the PAM to precipitate in a secondary precipitation tank in order to further remove the F<-> in the wastewater. The advanced treatment method for cyanide and fluoride composite polluted wastewater can remove cyanide and fluoride in the wastewater at the same time, the cyanide content in effluent is 0.1 mg / L or below, the fluoride content in the effluent is 5mg / L or below, the corresponding emission standard is met, the generated sludge amount is low, and the treatment cost is low.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for advanced treatment of cyanofluorine compound polluted wastewater. Background technique [0002] Coking wastewater is high-concentration and complex organic wastewater produced in the process of coal coking and gas purification, which contains organic pollutants such as phenols, benzene series, polycyclic aromatic hydrocarbons, and inorganic pollutants such as ammonia nitrogen, cyanide, fluoride, and sulfur cyanide. , with complex ingredients and a wide variety. [0003] In recent years, with the requirement of upgrading and reforming the environmental protection industry, the effluent standard of coking wastewater has become more stringent, and it is necessary to implement the second row in the "Discharge Standard of Pollutants for Coking Chemical Industry" (GB 16171-2012), that is, the cyanide content is less than 0.2mg / L, fluoride implements the firs...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/18C02F101/14
CPCC02F9/00C02F1/725C02F1/722C02F2305/026C02F1/5236C02F1/56C02F1/5245C02F1/44C02F2101/14C02F2101/18C02F1/50C02F1/5263
Inventor 李洁高彦波许生军贾彦文陈倩倩杨彦飞
Owner HANGZHOU XINGYUAN FILTER TECH
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