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A method for realizing short-cut nitrification and denitrification by using high light intensity

A short-range nitrification and denitrification technology is applied in the field of sewage treatment technology to achieve the effects of reducing reaction costs, reducing sludge production and saving aeration costs

Active Publication Date: 2022-05-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods either require special energy, or are suitable for treating high ammonia nitrogen wastewater, or require high ammonia nitrogen for sludge treatment, and the concentration of ammonia nitrogen in urban sewage treatment systems is often lower than 60mg / L, so the above methods are used in mainstream sewage There are certain limitations in processing

Method used

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  • A method for realizing short-cut nitrification and denitrification by using high light intensity
  • A method for realizing short-cut nitrification and denitrification by using high light intensity
  • A method for realizing short-cut nitrification and denitrification by using high light intensity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Direct irradiation of nitrifying bacteria with a cold light source high light intensity plate

[0022] The nitrifying bacteria that have been domesticated for a long time are subjected to nitrification and denitrification through SBR under high light intensity direct irradiation. Each cycle includes water inflow for 1 minute, anoxic for 1 hour, aerobic for 2.25 hours, precipitation for 1 hour, and drainage for 5 minutes. The mixture was mixed uniformly by a magnetic stirrer, and the -2 the s -1 Under light intensity irradiation, aeration is carried out by an air pump with an air stone. NOB showed certain photosensitivity under high light intensity, and gradually formed the accumulation of nitrite nitrogen.

[0023] Such as figure 1 As shown, in the 25th period of long-term culture, in the first hour of hypoxia, the concentration of ammonia nitrogen remained basically unchanged, and nitrite nitrogen and nitrate nitrogen were reduced to nitrogen; The concentr...

Embodiment 2

[0024] Example 2: Indirect irradiation of nitrifying bacteria using a cold light source high light intensity plate

[0025] The nitrifying bacteria that have been domesticated for a long time will be nitrified and denitrified by SBR under the indirect irradiation of high light intensity. -2 the s -1 The light intensity was irradiated for 3 hours under high light intensity, and at the same time, the mixture was uniformly mixed by a magnetic stirrer. Then stop the light, and carry out nitrification and denitrification through water inflow, including water inflow for 1min, anoxic for 0.5h, aerobic for 1.5h, sedimentation for 1h, and drainage for 5min. Aerate. NOB showed a certain photosensitivity and gradually formed the accumulation of nitrite nitrogen.

[0026] Such as image 3 As shown, in the 40th cycle of long-term cultivation, after 3 hours of light, then stop the light, and carry out nitrification and denitrification through water inflow. and nitrate nitrogen were red...

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Abstract

The invention discloses a method for realizing short-range nitrification and denitrification by using high light intensity. In the method, the activated sludge is irradiated under high light intensity, so that the nitrite oxidizing bacteria in the nitrifying bacteria of the sludge are inhibited, and then the conventional nitrification reaction is carried out, so that the initial ammonia nitrogen is oxidized to nitrite nitrogen and stops at Therefore, the generated nitrite nitrogen is reduced to nitrogen gas by denitrifying bacteria and discharged into the atmosphere, thereby removing the nitrogen in the wastewater. The method of the invention can save 25% of the aeration cost and 40% of the carbon source cost, and provide a stable electron acceptor for the subsequent anaerobic ammonium oxidation process, which can be used for rapid denitrification of sewage with high efficiency and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment technology and relates to a method for realizing short-range nitrification and denitrification, in particular to a method for realizing short-range nitrification and denitrification by using high light intensity. Background technique [0002] The biological nitrogen removal process in the traditional sewage treatment system consists of two steps, namely nitrification and denitrification. Among them, nitrite nitrogen is both the nitrification process (NH 4 + →NO 2 – →NO 3 – ) is the intermediate of the denitrification process (NO 3 – →NO 2 – →NO→N 2 O→N 2 ) intermediates. If ammonia nitrogen is oxidized to nitrite nitrogen during the nitrification process and stops here without further oxidation, then short-range nitrification and denitrification can be realized in wastewater for nitrogen removal. Through this method, 25% of aeration cost and 40% of carbon source cost can be s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 葛士建王凌峰邱爽陈志鹏
Owner NANJING UNIV OF SCI & TECH
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