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Sludge film composite autotrophic nitrogen removal technology and reactor based on light induction

An autotrophic denitrification, composite technology, applied in chemical instruments and methods, light water/sewage treatment, water/sludge/sewage treatment, etc. The effect of anammox denitrification, simple process flow and low cost

Active Publication Date: 2022-01-28
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, for urban sewage with low ammonia nitrogen concentration, the nitrification-anammox process has not been applied on a large scale so far. The main challenge is how to enrich the anammox bacteria in urban sewage with low temperature and low ammonia nitrogen concentration. Collection and retention, how to selectively inhibit the growth of nitrite oxidizing bacteria, etc.

Method used

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  • Sludge film composite autotrophic nitrogen removal technology and reactor based on light induction
  • Sludge film composite autotrophic nitrogen removal technology and reactor based on light induction
  • Sludge film composite autotrophic nitrogen removal technology and reactor based on light induction

Examples

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Embodiment 1

[0057] This example relates to a light-induced mud-film composite autotrophic denitrification reactor. The schematic diagram of the reactor structure is shown in the attached figure 2 As shown, the gravity sedimentation tank is used as the mud-water separation device, specifically in the form of vertical flow sedimentation tank, the sedimentation time is 3h, and the ultraviolet light-emitting diode is used as the long-wave ultraviolet light source, the peak wavelength is 365nm, and the radiation intensity is 500μW / cm 2 ;

[0058] Described sewage is the urban sewage after pretreatment, and main water quality index is: chemical oxygen demand (COD) is about 150mg / L, and ammonia nitrogen concentration is about 50mg N / L, and pH value is about 7.5, and alkalinity (as CaCO 3 Total) is about 300mg / L;

[0059] The specific operation and control method includes the following steps:

[0060] (1) The main reactor is inoculated with activated sludge in the aeration tank of an A2 / O proc...

Embodiment 2

[0065] This example relates to a light-induced mud-film composite autotrophic denitrification reactor. The schematic diagram of the reactor structure is shown in the attached image 3 As shown, membrane filtration is used as the mud-water separation unit, specifically, hollow fiber microfiltration membrane modules are used, and the membrane flux is 25L / m 2 / h, and the hydraulic retention time is 12 hours; when the membrane module is completely polluted (transmembrane pressure difference>50kPa), take out the membrane module and soak it in a chemical cleaning solution containing 0.01 M NaOH and 200mg / L sodium hypochlorite for 1 to 2 hours, Repeated use after chemical cleaning; use ultraviolet light-emitting diodes as long-wave ultraviolet light source, peak wavelength 365nm, irradiance intensity 500μW / cm 2 ;

[0066] Described sewage is the urban sewage after pretreatment, and main water quality index is: chemical oxygen demand (COD) is about 150mg / L, and ammonia nitrogen conce...

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Abstract

The invention provides a sludge film compound type autotrophic nitrogen removal process based on light induction, and belongs to the technical field of biological sewage treatment. The process is characterized in that ecological niche differentiation of functional bacteria is promoted through a method of adding a biofilm carrier and controlling process parameters, anaerobic ammonium oxidation bacteria mainly survive in a biofilm, and nitrifying bacteria including aerobic ammonia oxidizing bacteria, nitrite oxidizing bacteria and the like mainly survive in activated sludge, so that efficient interception of anaerobic ammonia oxidizing bacteria is realized; further, growth of nitrite oxidizing bacteria in the activated sludge is selectively inhibited through an ultraviolet light induced bacterial oxidative stress method, so that elutriation of the nitrite oxidizing bacteria is achieved; and finally, the nitrosation-anaerobic ammonia oxidation process is completed through cooperation of the aerobic ammonia oxidation bacteria and the anaerobic ammonia oxidation bacteria in the system, so that autotrophic nitrogen removal of the municipal sewage is achieved.

Description

technical field [0001] The invention relates to the technical field of sewage biological treatment, in particular to a light-induced mud film composite autotrophic denitrification technology and a reactor. Background technique [0002] Nitrogen is one of the main indicators for the reduction of water body pollutants in my country. The traditional nitrification and denitrification process is the main denitrification technology for sewage treatment today, but it also has the problem of high energy consumption for aeration. As far as sewage denitrification is concerned, In the traditional way of nitrogen removal, the nitrification process needs to consume a lot of oxygen, and the denitrification process needs to consume more carbon sources (4.57g of oxygen and 2.86g of COD are consumed for every 1g of nitrogen removed), while more than 70% of urban sewage in my country has low-carbon The characteristics of the nitrogen ratio, the total nitrogen in the effluent needs to add a larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/16C02F1/32
CPCC02F3/30C02F2101/16C02F1/32Y02W10/10
Inventor 储昭瑞梁晓君黄丹丹荣宏伟
Owner GUANGZHOU UNIVERSITY
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