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Method for partial denitrification through light-enzyme synergy and application of method

A denitrification and photocatalyst technology, applied in chemical instruments and methods, anaerobic digestion, chemical/physical processes, etc., can solve time-consuming and energy-consuming problems, reduce emissions, reduce carbon source supply, and reduce energy consumption. consumption effect

Active Publication Date: 2022-03-04
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires 15 cycles of repeated water intake-anoxic stirring-drainage to achieve stable operation of partial denitrification
The enrichment culture process of functional bacteria consumes a lot of time and energy

Method used

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  • Method for partial denitrification through light-enzyme synergy and application of method
  • Method for partial denitrification through light-enzyme synergy and application of method
  • Method for partial denitrification through light-enzyme synergy and application of method

Examples

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Effect test

Embodiment 1

[0088] This embodiment provides a method for performing partial denitrification in concert with light-enzyme, the method comprising the following steps:

[0089] (1) After grinding 4g of dicyandiamide, add it to 100ml of ultrapure water, and ultrasonically (300W) for 30 minutes, stir and dissolve into a colorless clear liquid; add 12g of sodium chloride to the above-mentioned colorless clear liquid and stir until Completely dissolve, then add 40 mg cobalt nitrate tetrahydrate to obtain a mixed solution; pour the above mixed solution into a paper cup filled with liquid nitrogen, freeze for 10 minutes until it is completely frozen, freeze-dry for 72 hours, and then grind to obtain a precursor powder; The powder is sintered in a tube furnace, the protective gas is nitrogen with a purity of 5N, the ventilation rate is 50ml / min, the heating rate is 2.2°C / min, and the temperature rises to 550°C for 4 hours; after the sintering, the obtained product is placed in an agate mortar groun...

Embodiment 2

[0095] This embodiment provides a method for performing partial denitrification in concert with light-enzyme, the method comprising the following steps:

[0096] (1) After grinding 4g of dicyandiamide, add it to 80ml of ultrapure water, and ultrasonically (200W) for 40 minutes, stir and dissolve into a colorless clear liquid; add 6g of potassium chloride to the above-mentioned colorless clear liquid and stir until Completely dissolve, then add 20 mg of ferric chloride hexahydrate to obtain a mixed solution; pour the above mixed solution into a paper cup filled with liquid nitrogen, freeze for 12 minutes until it is completely frozen, freeze-dry for 48 hours, and then grind to obtain a precursor powder; The above powder was sintered in a tube furnace, the protective gas was nitrogen with a purity of 5N, the ventilation rate was 50ml / min, the heating rate was 2.2°C / min, and the temperature was raised to 500°C for 3 hours; Grind into powder in a bowl, wash 4 times with ultrapure ...

Embodiment 3

[0101] This embodiment provides a method for performing partial denitrification in concert with light-enzyme, the method comprising the following steps:

[0102] (1) After grinding 4g of dicyandiamide, add it to 100ml of ultrapure water, and ultrasonically (200W) for 40min, stir and dissolve into a colorless clear liquid; add 10g of potassium chloride to the above-mentioned colorless clear liquid and stir until Completely dissolve, then add 80mg of nickel nitrate to obtain a mixed solution; pour the above mixed solution into a paper cup filled with liquid nitrogen, freeze for 14 minutes until it is completely frozen, freeze-dry for 60 hours, and then grind to obtain a precursor powder; put the above powder in Carry out sintering in a tube furnace, the protective gas is nitrogen with a purity of 5N, the ventilation rate is 50ml / min, the heating rate is 2.2°C / min, and the temperature rises to 530°C for 3.5h; after the sintering, the obtained product is placed in an agate mortar ...

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Abstract

The invention provides a light-enzyme synergistic partial denitrification method, which comprises the following steps: mixing a photocatalyst, a biocatalyst, a sacrificial agent and a NO3 <->-N-containing reaction solution, and carrying out partial nitration reaction in an anaerobic environment under an illumination condition, the photocatalyst comprises carbon nitride for modifying a metal single atom and a cyano group; the biocatalyst comprises nitrate reductase; according to the method, photocatalysis and biological catalysis are combined to synergistically catalyze and reduce nitrate in sewage, the denitrification reaction of the nitrate is stably controlled in the nitrite production stage, and the subsequent anaerobic ammonia oxidation process is matched, so that the consumption of a carbon source and energy in the wastewater denitrification process can be greatly reduced, and the water treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of catalytic water purification, and relates to a method for partial denitrification by light-enzyme synergy and its application, in particular to a method for reducing partial denitrification of nitrate in water to Nitrite, and achieve its high-efficiency enrichment. Background technique [0002] Denitrification process is a key process to evaluate nitrogen cycle conversion and control nitrogen pollution in water environment. Many technologies have been developed to control nitrogen pollution in surface water and groundwater, among which anaerobic ammonium oxidation is considered to be one of the most promising treatment methods. Compared with the traditional nitrification-denitrification process, this process requires less oxygen and carbon source supply, produces much less sludge, and can also reduce a large amount of CO 2 emission. [0003] In this process, anammox bacteria convert nitrite nitrogen (N...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/28B01J27/26C02F101/16C02F1/30
CPCC02F3/34C02F3/342C02F1/30C02F3/28C02F3/348B01J27/26C02F2101/163C02F2101/16C02F2305/10B01J35/39Y02W10/37
Inventor 刘锐平边继踊安晓强苗时雨刘会娟胡承志曲久辉
Owner TSINGHUA UNIV
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