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Preparation and application of sulfur-based autotrophic and heterotrophic denitrification nitrogen removal biological filler

A technology of heterotrophic denitrification and biological filler, which is applied in the field of advanced wastewater treatment and reuse, can solve the problems of difficult to further improve the treatment efficiency, uneven distribution of biofilm, long time of biofilm formation, etc., and achieve denitrification and operation effect Stabilize, enhance the population richness, and facilitate the effect of attachment growth

Active Publication Date: 2019-11-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] At the same time, the present invention uses the above-mentioned biological filler in the denitrification treatment of wastewater, while ensuring the treatment efficiency, to overcome the long time and low treatment efficiency of the existing denitrification, sulfur autotrophic and heterotrophic coupling denitrification water treatment technology. It is difficult to further improve, uneven distribution of biofilm, secondary pollution of effluent, high sulfate radicals in effluent, stratification of fillers, etc.

Method used

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  • Preparation and application of sulfur-based autotrophic and heterotrophic denitrification nitrogen removal biological filler
  • Preparation and application of sulfur-based autotrophic and heterotrophic denitrification nitrogen removal biological filler

Examples

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Embodiment 1

[0057] Such as figure 2 As shown, this embodiment provides a sulfur autotrophic and heterotrophic denitrification biofiller, which is a sulfur-modified ceramsite loaded with sulfur on the surface, and the sulfur combines with Si and O elements on the surface of the ceramsite to form Si -O-S, the Si-O-S are cross-linked with each other to form a grid structure. In this embodiment, the preparation method of sulfur-modified sulfur autotrophic and heterotrophic denitrification denitrification biofillers is as follows:

[0058] (1) Alkali modification:

[0059] The primary ceramsite is soaked in a potassium hydroxide solution, and washed with water after soaking to obtain the alkali-modified ceramsite;

[0060] (2) Sulfur loading:

[0061] Disperse the alkali-modified ceramsite in petroleum ether solvent, slowly add disulfur dichloride, heat and stir, and obtain sulfur-loaded sulfur-modified ceramsite after the reaction is completed, and continuously feed nitrogen during the re...

Embodiment 2

[0063] This embodiment provides a sulfur autotrophic and heterotrophic denitrification biofiller. The said biofiller is sulfur-modified ceramsite which has undergone alkali modification and sulfur loading treatment in sequence.

[0064] The preparation method of sulfur autotrophic and heterotrophic denitrification denitrification biological filler in this embodiment is as follows:

[0065] (1) Firing:

[0066] Add the binder calcium-based bentonite to the raw material dewatered sludge and clay of ceramsite to prepare raw meal powder, make the raw meal powder into raw meal balls, and roast the raw meal balls at high temperature to obtain primary ceramsite; ceramsite The mass ratio of raw material to binder is 20:1.

[0067] (2) Alkali modification:

[0068] The primary ceramsite is soaked in a potassium hydroxide solution with a mass concentration of 2%, and washed with water after soaking to obtain alkali-modified ceramsite;

[0069] (3) Sulfur loading:

[0070] Disperse t...

Embodiment 3

[0074] This embodiment provides a biological filler, which is sulfur-modified ceramsite that has undergone alkali modification and sulfur loading treatment in sequence.

[0075] The preparation method of sulfur autotrophic and heterotrophic denitrification denitrification biological filler in this embodiment is as follows:

[0076] (1) Firing:

[0077] Add the binder sodium bentonite to the ceramsite raw material fly ash and garbage residue to prepare raw meal powder, make raw meal balls from the raw meal powder, and roast the raw meal balls at high temperature to obtain primary ceramsite; ceramsite The mass ratio of raw material to binder is 25:1.

[0078] (2) Alkali modification:

[0079] The primary ceramsite is soaked in potassium hydroxide solution with a mass concentration of 3%, and washed with water after soaking to obtain alkali-modified ceramsite;

[0080] (3) Sulfur loading:

[0081] Disperse the alkali-modified ceramsite in petroleum ether solvent, slowly add d...

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Abstract

The invention discloses preparation and application of a sulfur-based autotrophic and heterotrophic denitrification nitrogen removal biological filler. According to the invention, the number of micropores and silicon hydroxyl groups on the surface of ceramsite is increased through alkali etching; then the surface of the alkali-modified ceramsite is activated by utilizing high-activity disulfur dichloride; and the disulfur dichloride can be chemically bonded with hydroxyl functional groups on the surface of the ceramsite, so sulfur is loaded onto the surface of the ceramsite to form Si-O-S andcross-linking is performed so as to form a stable net-shaped structure. The sulfur-based autotrophic and heterotrophic denitrification nitrogen removal biological filler provided by the invention canrealize coupling of sulfur-based autotrophic and heterotrophic denitrification, is beneficial for the attached growth of microorganisms, reduces the addition of carbon sources, improves population richness, further increases nitrogen removal efficiency and stabilizes effluent quality.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment and reuse of wastewater, and more specifically relates to the preparation and application of a sulfur autotrophic and heterotrophic denitrification denitrification biological filler Background technique [0002] Nitrogen pollution in water bodies has become one of the main problems threatening the quality of water bodies in my country. High levels of nitrogen cause eutrophication of water bodies and the degradation of water environment quality, which threatens people's health. Biological denitrification is widely used in deep denitrification due to its high efficiency and low cost. The secondary effluent deep denitrification processes of sewage plants mainly include biological filter, activated sludge method, advanced oxidation method and constructed wetland. Among them, the denitrification biological filter has the advantages of small footprint, high denitrification efficiency, strong ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/28C04B33/132C04B33/13C04B38/00C04B41/85C04B41/91
CPCC02F3/34C02F3/2806C04B38/009C04B33/13C04B33/1321C04B33/1352C04B33/132C04B41/5353C04B41/85C04B41/91C04B41/4584C04B41/50C02F2209/16C02F2209/19Y02P40/60
Inventor 刘波程绍举侯玉倩张陈永王梦良杜凌峰
Owner NANJING UNIV
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