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A kind of denitrification and denitrification biological filler and its preparation method and application

A nitrification and denitrification biological and denitrification technology, which is applied in the field of denitrification and denitrification biological fillers and its preparation, can solve the problems of long film-hanging time, secondary pollution of effluent, and bottlenecks in treatment efficiency, so as to improve the quality of effluent water and improve Good denitrification performance and water purification effect

Active Publication Date: 2022-04-19
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a denitrification and denitrification biological filler and its preparation method and application. The denitrification and denitrification biological filler prepared by the present invention can realize the effect of sulfur autotrophic and heterotrophic coupling denitrification and denitrification, while ensuring the treatment efficiency At the same time, it solves the problems of long film-hanging time, bottlenecks in treatment efficiency, and secondary pollution of effluent in the existing autotrophic and heterotrophic denitrification treatments.

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  • A kind of denitrification and denitrification biological filler and its preparation method and application
  • A kind of denitrification and denitrification biological filler and its preparation method and application
  • A kind of denitrification and denitrification biological filler and its preparation method and application

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preparation example Construction

[0028] The invention provides a preparation method of denitrification and denitrification biological filler, comprising the following steps:

[0029] placing β-cyclodextrin in sodium hydroxide ethanol solution, and performing activation modification to obtain activated β-cyclodextrin;

[0030] Mixing the activated β-cyclodextrin with a halogenated substance and a catalyst to perform a halogenation reaction to obtain a halogenated β-cyclodextrin;

[0031] placing the halogenated β-cyclodextrin in a sodium hydrosulfide ethanol solution, and performing a mercapto substitution reaction to obtain a mercaptolated β-cyclodextrin;

[0032] mixing the mercaptolated β-cyclodextrin and a dehydrating agent in an organic solvent, and performing a dehydration condensation reaction to obtain a modified network structure β-cyclodextrin;

[0033] The modified network structure beta-cyclodextrin is mixed with a binder, and hot-melt granulation is carried out to obtain a denitrification and den...

Embodiment 1

[0066] (1) Activation modification: put the β-cyclodextrin powder in a sodium hydroxide ethanol solution with a mass concentration of 3%, soak for 24 hours, take out the filler after completion, wash with absolute ethanol until the pH of the washing solution is 7.0, and put Dry in a vacuum oven to obtain activated β-cyclodextrin;

[0067] (2) Chlorination: put the activated β-cyclodextrin into 1200 mL of thionyl chloride solution with a mass concentration of 20%, add 50 mL of a DMAP solution with a mass concentration of 46%, soak it for 6 hours, and remove it with After washing with water and ethanol, put it into a vacuum drying oven to dry to obtain chlorinated β-cyclodextrin;

[0068] (3) Substitution of mercapto groups: place the chlorinated β-cyclodextrin in a sodium hydrosulfide ethanol solution with a mass concentration of 32%, put it into a water bath at 60°C and heat it in a water bath; 120rpm; after 8 hours, take out the filler, rinse the surface of the filler with a...

Embodiment 2

[0074] (1) Activation modification: put the β-cyclodextrin powder in a sodium hydroxide ethanol solution with a mass concentration of 3%, soak for 18 hours, take out the filler after completion, wash with absolute ethanol until the pH of the washing solution is 7.0, and put Dry in a vacuum oven to obtain activated β-cyclodextrin;

[0075] (2) Chlorination: put the activated β-cyclodextrin into 1200 mL of thionyl chloride solution with a mass concentration of 20%, add 50 mL of a DMAP solution with a mass concentration of 46%, soak it for 6 hours, and remove it with Wash with water and ethanol until the pH of the washing solution is 7.0, put it in a vacuum drying oven and dry it to obtain β-cyclodextrin chloride;

[0076] (3) Substitution of mercapto groups: place the chlorinated β-cyclodextrin in a sodium hydrosulfide ethanol solution with a mass concentration of 32%, put it into a water bath at 60°C and heat it in a water bath; 100rpm; after 8 hours, take out the filler, rins...

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Abstract

The invention provides a denitrification and denitrification biological filler, a preparation method and application thereof, and relates to the technical field of sewage treatment. The present invention adopts β-cyclodextrin with a certain spatial network structure as the main body, first soaking in sodium hydroxide ethanol solution can activate the hydroxyl functional group on the periphery of the filler, and replace it with halogen atoms conveniently; It is further replaced with mercapto functional groups to load sulfur in the filler; then dehydration condensation can further convert mercapto functional groups into more stable disulfide bonds with modified spatial network structure; denitrification can be obtained after hot melt granulation Nitrogen removal biological filler. The denitrification and denitrification biological filler prepared by the invention can realize the denitrification effect of sulfur autotrophic and heterotrophic coupled denitrification, while ensuring the treatment efficiency, it solves the problem of long film-hanging time in the existing autotrophic and heterotrophic denitrification treatment , There are bottlenecks in processing efficiency, secondary pollution of effluent and other problems.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a denitrification and denitrification biological filler and a preparation method and application thereof. Background technique [0002] At present, denitrification and denitrification technologies are mainly divided into two categories: heterotrophic denitrification and autotrophic denitrification. Heterotrophic denitrification mainly treats C / For waste water with low N, the treatment capacity per unit volume of the reactor is large, but the cost is high, and it will cause secondary pollution; while autotrophic denitrification is based on inorganic carbon (CO 2 , CO 3 2- 、HCO 3 - etc.) as the carbon source, inorganic matter (H 2 , S, S 2- 、HS - , S 2 o 3 2- , Fe, Fe 2+ etc.) complete the metabolic process of microorganisms for electron donors, and finally reduce nitrate to nitrogen, but autotrophic denitrification has the disadvantages of low processing rate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/2806C02F2101/16
Inventor 刘波隆添翼史航柳聪张陈永王梦良周立松
Owner NANJING UNIV
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