Method and system for deep denitrification of sewage

A technology for deep denitrification and sewage, applied in the field of water treatment, can solve the problems of limited deep denitrification capacity, unstable denitrification process, and excessive COD in effluent, achieve convenient operation and maintenance, realize short-range nitrification and denitrification, and strengthen deep biological The effect of denitrification

Active Publication Date: 2022-07-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of traditional biological treatment technology is mature and easy to operate, but it often faces the problem of unstable denitrification process and limited deep denitrification capacity
In particular, my country's sewage treatment plants often face the problem of low COD in sewage. Since the denitrification process needs to consume carbon sources, when the sewage itself has insufficient carbon sources, it is necessary to add additional carbon sources. Additional carbon sources will not only increase treatment costs, but also bring The risk of effluent COD exceeding the standard

Method used

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  • Method and system for deep denitrification of sewage

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Effect test

Embodiment 1

[0103] The system for deep denitrification of sewage used in the embodiment is as follows: figure 1 shown, follow the steps below:

[0104] (1) After the sewage is pretreated, it is discharged into the system for deep denitrification of sewage from the water inlet 19 at the upper end of the first membrane reaction zone 1, and the total nitrogen concentration of the influent is 40 mg / L;

[0105] (2) Sewage enters the deep denitrification system of sewage (microorganism / nano-palladium coupling) for deep denitrification. First, it flows through the first membrane reaction zone 1, and the microorganisms on the carrier membrane fully contact the nitrogen-containing pollutants in the sewage and carry out the membrane Based on microorganism treatment, air is used as the gas supply gas, the dissolved oxygen concentration is 0.8mg / L, the gas supply pressure is 1psi, the hydraulic retention time is 8h, and the flushing intensity of the controlled flushing aeration is 12L / (s m 2 ), the ...

Embodiment 2

[0110] The system for deep denitrification of sewage used in the embodiment is as follows: figure 1 shown, follow the steps below:

[0111] (1) After the sewage is pretreated, it is discharged into the system for deep denitrification of sewage from the water inlet 19 at the upper end of the first membrane reaction zone 1, and the total nitrogen concentration of the influent is 40 mg / L;

[0112] (2) Sewage enters the deep denitrification system of sewage (microorganism / nano-palladium coupling) for deep denitrification. First, it flows through the first membrane reaction zone 1, and the microorganisms on the carrier membrane fully contact the nitrogen-containing pollutants in the sewage and carry out the membrane Based on microorganism treatment, air is used as the gas supply gas, the dissolved oxygen concentration is 1.5mg / L, the gas supply pressure is 10psi, the hydraulic retention time is 8h, and the flushing intensity of the controlled flushing aeration is 12L / (s m 2 ), the...

Embodiment 3

[0117] The system for deep denitrification of sewage used in the embodiment is as follows: figure 1 shown, follow the steps below:

[0118] (1) After the sewage is pretreated, it is discharged into the system for deep denitrification of sewage from the water inlet 19 at the upper end of the first membrane reaction zone 1, and the total nitrogen concentration of the influent is 40 mg / L;

[0119] (2) Sewage enters the deep denitrification system of sewage (microorganism / nano-palladium coupling) for deep denitrification. First, it flows through the first membrane reaction zone 1, and the microorganisms on the carrier membrane fully contact the nitrogen-containing pollutants in the sewage and carry out the membrane Based on microorganism treatment, air was used as the gas supply gas, the dissolved oxygen concentration was 2mg / L, the gas supply pressure was 20psi, the hydraulic retention time was 8h, and the flushing intensity of the controlled flushing aeration was 12L / (s m 2 ), ...

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Abstract

The invention relates to the field of water treatment, in particular to a method and system for deep denitrification of sewage. The method includes the following steps: 1) subjecting the water body to be treated by membrane-based microorganisms; 2) under the catalytic action of nano-metals and hydrogen supported on the carrier membrane, reducing nitrous nitrogen in the water body obtained from the membrane-based microbial treatment to nitrogen gas . The system includes: a first membrane reaction zone for treating water body to be treated with membrane-based microorganisms, and a first membrane assembly is arranged in the first membrane reaction zone; microorganisms are attached to the membrane in the first membrane assembly; A second membrane reaction zone in which nitrous nitrogen in the treated water body is reduced to nitrogen, a second membrane assembly is arranged in the second membrane reaction zone; nano-metals are attached to the membrane in the second membrane assembly; the second membrane reaction zone reacts with the first membrane zone is in fluid communication. The invention realizes short-range nitrification and denitrification, so that the total nitrogen pollutant removal rate of the treated sewage reaches 95%, and the discharge standard of quasi-four types of water is reached.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method and system for deep denitrification of sewage, which couples microbial metabolism and nano-catalysis to realize deep denitrification of sewage. Background technique [0002] With the rapid development of my country's economy, the problem of water pollution is becoming more and more serious. In 2018, the total amount of sewage produced in my country has exceeded 70 billion tons, of which domestic sewage accounts for more than 70%, becoming the main source of sewage. Domestic sewage is often rich in nitrogen pollutants and phosphorus pollutants. If the discharge does not meet the standards, it will cause eutrophication of natural water bodies. In 2015, the total amount of ammonia nitrogen discharged from urban domestic sewage in my country reached 1.341 million tons, accounting for 60% of the total discharge of all types of sewage. Therefore, denitrification is still a maj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/302
Inventor 郑雄杨澜陈银广吴瑒武婧
Owner TONGJI UNIV
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