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

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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 traditiona

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

Examples

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Example Embodiment

[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 with 0.001 times the mass of chitosan , And then add polydimethyldiallylammonium chloride of equal chitosan quality dropwise at a speed of 1d / s, stir and react for 24-30h, after the reaction is complete, dialyze the reactant with distilled water for 24h, then use anhydrous acetone The precipitate is then centrifuged to obtain the precipitate, soaked in absolute ethanol for 5 minutes, filtered and dried to obtain modified chitosan.

[0046] Coating: Dissolve n-tetrabutyl titanate in absolute ethanol, stir and mix uniformly, add ethyl orthosilicate dropwise at a rate of 30-35d / min, including absolute ethanol, n-tetrabutyl titanate, and ortho silicon The molar ratio of ethyl acid is 6:3:1. After the dropwise addition is completed, stir at 800-850rpm for 1 hour to obtain solution A; add cetylpyridinium chlor...

Example Embodiment

[0049] Example one

[0050] The present invention is a method for advanced treatment of cyano-fluoride composite polluted waste water. The specific treatment steps of cyanide-fluoride composite polluted waste water are as follows:

[0051] 1) Put the biochemically treated wastewater into the oxidation cyanide breaking tank, add sulfuric acid to adjust the pH to 4.5-5. The sulfuric acid can be used with any concentration of sulfuric acid. In this embodiment, 98% concentrated sulfuric acid is selected for pH adjustment. Then according to 1700-1750mg / L, this embodiment chooses to add ferrous sulfate at a dosage of 1700mg / L, stir and react for 15-18min and then according to 500-550mg / L, this embodiment chooses to add hydrogen peroxide at a dosage of 500mg / L , Add copper sulfate according to the dosage of 100-120mg / L, preferably 100mg / L, continue to stir the reaction for 2-2.5h, add liquid caustic soda to adjust the pH to 6.5-7, and finally according to 1-3mg / L, this example chooses Ad...

Example Embodiment

[0057] Example two

[0058] Compared with the first embodiment, the difference between this embodiment and the first embodiment is that in step 6), after the wastewater in the secondary defluoridation tank is pumped into the secondary sedimentation tank, the value is 2-5 mg / L. For example, choose to add precipitant at a 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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