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A kind of preparation method of water treatment agent for advanced treatment of viscose fiber wastewater

A technology of water treatment agent and viscose fiber, applied in the field of preparation of water treatment agent, can solve the problems of reduction of effective volume of sewage pool, damage of mixer load, economic loss of enterprises, etc., and achieve obvious convenience, inhibition of crystal formation, and good treatment. effect of effect

Active Publication Date: 2021-07-20
NANJING UNIV +1
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  • Description
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Problems solved by technology

Among them, the membrane method can effectively reduce COD and remove sulfate and calcium ions in wastewater, but the expensive membrane and membrane fouling limit the application of this method to a certain extent.
However, due to the need to use a large amount of sulfuric acid in the viscose fiber production process, a large amount of acidic wastewater containing sulfate radicals is formed, and in order to reduce the treatment cost and simultaneously remove part of the sulfate radicals, lime is usually used when adjusting the pH, which makes the biochemical effluent contain both Refractory organic compounds (COD100 or so), but also contain relatively high concentrations of sulfate and calcium ions (hardness above 1000mg / L)
Therefore, in the subsequent advanced treatment process, when the concentration of calcium ions and sulfate radicals in the wastewater is higher than the concentration at the dissolution equilibrium, the dissolution stability will be broken. Under certain conditions, crystallization will form crystal nuclei, which will adhere to the pool wall and form The continuous growth will eventually produce thick scaling on the pool wall and the blades of the wastewater mixer, resulting in a reduction in the effective volume of the sewage tank and damage to the mixer due to overload. Therefore, the enterprise sewage plant has to stop production after a period of operation to clean up the sewage. A large number of calcium sulfate crystals crystallized and precipitated in the pool brought huge economic losses to the enterprise
At the same time, considering that the wastewater that needs advanced treatment is biochemical effluent, in which COD is mainly composed of refractory organic matter, the traditional Fenton oxidation treatment technology usually uses the method of adding sulfuric acid to adjust the pH to improve the oxidation capacity of the system, so as to cope with rubber fiber production. Unstable factors in process water quality, and the increase of sulfate further exacerbated the crystallization problem

Method used

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  • A kind of preparation method of water treatment agent for advanced treatment of viscose fiber wastewater
  • A kind of preparation method of water treatment agent for advanced treatment of viscose fiber wastewater
  • A kind of preparation method of water treatment agent for advanced treatment of viscose fiber wastewater

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Experimental program
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Effect test

Embodiment 1

[0062] 1. Preparation of porous carbon sphere solid acid

[0063] 1.1. Preparation of magnetic porous carbon spheres

[0064] 1.1.1. The lignin in the coconut shell is separated by alkaline method, and then the cellulose is hydrolyzed by concentrated acid to prepare a six-carbon sugar solution.

[0065] 1.1.2. Hexose-based porous carbon spheres with a particle size of 2 μm were prepared by in-situ polycondensation and carbonization of the hexose solution prepared above.

[0066] 1.1.3, the Fe 3 o 4 The powder material is introduced into the six-carbon sugar-based porous carbon sphere solution, and after stirring and mixing evenly, the suspension is hydrothermally treated at 180° C. for 10 h. The obtained black solid was magnetically separated, washed repeatedly with water and ethanol, and then dried to obtain magnetic porous carbon spheres.

[0067] 1.2. Acidification treatment

[0068] The prepared magnetic porous carbon spheres are acidified with sulfonic acid to obtain...

Embodiment 2

[0080] 1. Preparation of porous carbon sphere solid acid

[0081] 1.1. Preparation of magnetic porous carbon spheres

[0082] 1.1.1. The lignin in the coconut shell is separated by alkaline method, and then the cellulose is hydrolyzed by concentrated acid to prepare a six-carbon sugar solution.

[0083] 1.1.2. Hexose-based porous carbon spheres with a particle size of 5 μm were prepared by in-situ polycondensation and carbonization of the hexose solution prepared above.

[0084] 1.1.3, the Fe 3 o 4 The powder material is introduced into the six-carbon sugar-based porous carbon sphere solution, and after stirring and mixing evenly, the suspension is hydrothermally treated at 180° C. for 10 h. The obtained black solid was magnetically separated, washed repeatedly with water and ethanol, and then dried to obtain magnetic porous carbon spheres.

[0085] 1.2. Acidification treatment

[0086] The prepared magnetic porous carbon spheres are acidified with sulfonic acid to obtain...

Embodiment 3

[0098] Embodiment 3 Compared with Embodiment 1, except that the liquid water treatment agent is prepared into the content of the solid water treatment agent, the remaining parts are the same, and the specific preparation steps are as follows:

[0099] 1. Preparation of three-dimensional porous hydrogel carrier

[0100] 1.1. Heat 15% polyvinyl alcohol aqueous solution at 130 MPa and 130°C for 1 hour, dissolve evenly, take it out, and let it stand to cool to room temperature.

[0101] 1.2. Mix polyvinylpyrrolidone as a surfactant with sodium chloride particles as a soluble solid particle at a mass ratio of 1:2 as a porogen.

[0102]1.3. Mix the solution prepared in step S311 with the porogen prepared in step S312 at a mass ratio of 10:1, stir evenly at high speed, then freeze at -80°C for 12 hours, then thaw for 12 hours, and cycle freezing and thawing steps 4 times.

[0103] 1.4. The finished product prepared in step S313 was ultrasonically cleaned at 25° C. for 1 hour, and th...

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a method for preparing a water treatment agent for advanced treatment of viscose fiber wastewater, which mainly consists of "preparing porous carbon sphere solid acid" → "preparing self-made scale inhibitor" → "preparation of water treatment agent" and other steps. Compared with traditional water treatment agents, the magnetic porous carbon sphere solid acid in the water treatment agent of the present invention has slow-release properties, can enrich refractory organic pollutants in sewage for a long time and stably, and also has catalytic properties. It can effectively improve the performance of C201 oxidant to degrade organic matter, so it has better COD removal effect and wider pH adaptation range. At the same time, this water treatment agent does not need to add sulfuric acid during use, so it can reduce the problem of crystallization caused by the increase of sulfate concentration. In addition, the water treatment agent of the present invention is also added with a scale inhibitor to further inhibit the formation of crystals, so it has advantages in the advanced treatment of viscose fiber wastewater and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a preparation method of a water treatment agent for advanced treatment of viscose wastewater. Background technique [0002] Viscose fiber is a renewable fiber prepared from abundant and cheap cotton, bamboo, wood and other natural fibers through a series of complex physical and chemical reactions. It is the most similar to natural fiber in chemical fiber quality. , is also one of the extremely important raw materials for the textile industry. As a big viscose fiber producing country, my country ranks first in the world in viscose fiber production. The viscose fiber industry has made great contributions to my country's economy, finance, export and employment. However, the environmental pressure brought by large-scale will also increase, and the pollution situation will become increasingly severe. Among them, the viscose fiber wastewater with high suspended solids, high c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/10C08F220/06C08F222/06C08F220/58C08F216/14C02F101/10C02F103/34
CPCC02F5/10C02F2101/101C02F2103/34C08F220/06C08F222/06C08F216/1475C08F220/585
Inventor 吕路黄前霖吕飞徐敬生张炜铭潘丙才
Owner NANJING UNIV
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