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Biological filler for nitrogen removal by denitrification as well as preparation method and application thereof

A nitrification and denitrification biological and denitrification technology, which is applied in the field of denitrification and denitrification biological filler and its preparation, can solve the problems of long film hanging time, secondary pollution of effluent, bottleneck in treatment efficiency, etc. Good denitrification performance and water purification effect

Active Publication Date: 2021-10-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Biological filler for nitrogen removal by denitrification as well as preparation method and application thereof
  • Biological filler for nitrogen removal by denitrification as well as preparation method and application thereof
  • Biological filler for nitrogen removal by denitrification as well as preparation method and application thereof

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preparation example Construction

[0029] The present invention provides a method of preparing a denitrifying azide biomatic filler, comprising the steps of:

[0030] The β-cyclodextrin is refined in the sodium hydroxide solution, and activation modification is carried out to obtain an activated β-cyclodextrin;

[0031] The activated β-cyclodextrin and a halogenated product are mixed, and the halogenated reaction is carried out to obtain a halogenated beta-cyclodextrin;

[0032] The halide β-cyclodextrin is refined in a solution of sodium hydrogen sulfide ethanol, and the sulfhydryl-substituted reaction is obtained to give mercaptogenic β-cyclodextrin;

[0033] The mercaptogenated β-cyclodextrin and a dehydrating agent were mixed in an organic solvent to perform a dehydration condensation reaction to obtain a modified mesh structure β-cyclodextrin;

[0034] The modified mesh structure β-cyclodextrin and the binder were mixed to provide thermal measuring granules to obtain a denitrified nitrogen-filled biofill.

[0...

Embodiment 1

[0067] (1) Activation modification: Place the β-cyclorefine powder at a concentration of 3% sodium hydroxide solution, soaked for 24 h, then remove the filler, washed out of water, washed with anhydrous ethanol to 7.0, release Enter the vacuum drying box to dry to obtain an activated β-cyclodextrin;

[0068] (2) Chlorine: Put the activated β-cyclodextrin into a thionyl chloride solution of 1200 ml of mass concentration, and add 50 ml of mass concentration of 46% to DMAP solution, soak for 6 h, so After cleaning of the aqueous ethanol, it was dried in a vacuum drying overall to obtain a chlorinated beta-cyclodextrin;

[0069] (3) Sulfhydryl substituted: β-cyclodextrin is refined in a solution of 32% sulfide ethanol solution, and the water bath is placed in a water bath in a water bath of 60 ° C. At the same time, start the stirrer to continuously stir, stirring speed Take 120 rpm; after 8h, the filler is removed, and the surface of the filler is flushed with anhydrous ethanol, and ...

Embodiment 2

[0075] (1) Activation modification: Place the beta-cyclorefine powder in a hydroxide solution of 3% mass concentration, soaked for 18 h, after completion, remove the filler, washed with anhydrous ethanol to 7.0, release Enter the vacuum drying box to dry to obtain an activated β-cyclodextrin;

[0076] (2) Chlorine: Put the activated β-cyclodextrin into a thionyl chloride solution of 1200 ml of mass concentration, and add 50 ml of mass concentration of 46% to DMAP solution, soak for 6 h, so The aqueous ethanol was washed to the washing liquid pH of 7.0, and dried in a vacuum drying tank to give chlorinated β-cyclodextrin;

[0077] (3) Sulfhydryl substituted: β-cyclodextrin is refined in a solution of 32% sulfide ethanol solution, and the water bath is placed in a water bath in a water bath of 60 ° C. At the same time, start the stirrer to continuously stir, stirring speed For 100 rpm; after 8 h, the filler was removed, and the filler was washed with anhydrous ethanol and then dried...

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Abstract

The invention provides a biological filler for nitrogen removal by denitrification as well as a preparation method and application thereof, belonging to the technical field of sewage treatment. According to the invention, beta-cyclodextrin with a certain space net structure is adopted as a main body; firstly, hydroxyl functional groups on the periphery of the filler can be activated by soaking the beta-cyclodextrin in a sodium hydroxide ethanol solution, and replacement with halogen atoms is facilitated; the sodium hydrosulfide ethanol solution can further replace a halogen element with a sulfydryl functional group, so a sulfur element is loaded in the filler; the sulfydryl functional group can be further converted into a disulfide bond which is more stable and has a modified space net-shaped structure through dehydration condensation; and hot melting granulation molding is conducted to obtain the biological filler for nitrogen removal by denitrification. The prepared biological filler for nitrogen removal by denitrification can achieve sulfur autrophism-heterotrophism coupled denitrification effect for nitrogen removal, treatment efficiency is guaranteed and the problems that biofilm culturing time is long, treatment efficiency has bottleneck, secondary pollution is caused to effluenti and the like in existing autotrophic and heterotrophic denitrification treatment are solved.

Description

Technical field [0001] The present invention relates to the field of sewage treatment, and more particularly to a denitrification nitrogen-filled biomatic filler and a preparation method thereof. Background technique [0002] At present, denitrification and nitrogen nitrogen is mainly divided into two major categories of heterotrophic denitrification and self-reigning denitrification, and heterogeneous denitrification is mainly by external organic carbon sources (methanol, ethanol, acetic acid, etc.) to treat C / N low wastewater, the unit volume reactor has a large handling capacity, but the cost is high, and the secondary pollution is produced; and the self-numerous denitrification is inorganic (CO) 2 , CO 3 2- , HCO 3 - Wait for carbon source, inorganic material (H 2 , S, S 2- HS - S 2 O 3 2- , Fe, Fe 2+ The et al. To the electron donor to complete the metabolic process of microorganisms, and the nitrate is finally reduced to nitrogen, but the self-raising denitrification h...

Claims

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Application Information

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Patent Type & Authority Applications(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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