Membrane bioreactor effluent treatment process for increasing denitrification effect

A membrane bioreactor, sewage treatment technology, applied in biological water/sewage treatment, sustainable biological treatment, water/sewage multi-stage treatment, etc. It can improve the efficiency of denitrification, reduce the hydraulic retention time and save the water pump.

Inactive Publication Date: 2010-06-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing process often has some defects during operation, such as: first, the mixed solution in the aerobic zone is directly returned to the anoxic zone, and the dissolved oxygen at the water inlet of the anoxic zone is likely to be too high, which makes the anoxic environment affected. destroy
Second, the NO in the MBR aerobic pool 3 - Denitrification to N 2 Therefore, in the anoxic section, organic matter as a carbon source is likely to become a limiting factor for denitrification, affecting the removal rate of total nitrogen (TN) in sewage

Method used

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  • Membrane bioreactor effluent treatment process for increasing denitrification effect
  • Membrane bioreactor effluent treatment process for increasing denitrification effect
  • Membrane bioreactor effluent treatment process for increasing denitrification effect

Examples

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Effect test

Embodiment 1

[0021] The raw water is municipal sewage, and the reactor sludge concentration is about 11000mg / L. Raw water enters the anoxic zone of the reactor, and the mixed solution in the anoxic zone is mixed evenly by stirring; The hydraulic retention time of the liquid is 4.5h, and the dissolved oxygen in the zone is maintained between 0.7mg / L-0.8mg / L through micro-aeration tube aeration; the mixed liquor in the synchronous nitrification and denitrification zone Part of it is sent through the first overflow port to the membrane zone of the reactor in which the membrane module is installed. A siphon with a flowmeter is returned to the facultative zone of the reactor, and the volume ratio of the reflux liquid to the purified water outlet in the membrane zone of the reactor is 200%; a part of the mixed solution in the membrane zone of the reactor is covered by the membrane After the component is filtered and purified, it is discharged, and part of it flows back into the facultative zone...

Embodiment 2

[0024]The raw water is municipal sewage, and the reactor sludge concentration is about 11000mg / L. Raw water enters the anoxic zone of the reactor, and the mixed solution in the anoxic zone is mixed evenly by stirring; The hydraulic retention time of the liquid is 4h, and the dissolved oxygen in the zone is kept between 0.8mg / L-1.0mg / L through micro-aeration tube aeration; The dissolved oxygen concentration in the membrane area is between 2.5mg / L-3.0mg / L, and the other part of the mixed liquid passes through the reactor with membrane modules through the first overflow port. The siphon of the flowmeter returns to the facultative zone of the reactor, and the volume ratio of the reflux liquid to the purified water effluent in the membrane zone of the reactor is 100%; Discharge after filtering and purifying, and part of it flows back into the facultative zone of the reactor through the second overflow port. A partition with a flow channel, then enters the anoxic zone through the ...

Embodiment 3

[0027] The raw water is municipal sewage, and the reactor sludge concentration is about 11000mg / L. Raw water enters the anoxic zone of the reactor, and the mixed solution in the anoxic zone is mixed evenly by stirring; The hydraulic retention time of the liquid is 5h, and the dissolved oxygen in the area is maintained between 0.8mg / L-0.9mg / L through micro-aeration tube aeration: a part of the mixed liquid in the synchronous nitrification and denitrification area The dissolved oxygen concentration in the membrane area is between 2.5mg / L-3.0mg / L, and the other part of the mixed liquid passes through the reactor with membrane modules through the first overflow port. The siphon of the flowmeter returns to the facultative zone of the reactor, and the volume ratio of the reflux liquid to the purified water effluent in the membrane zone of the reactor is 300%; Discharge after filtering and purifying, and part of it flows back into the facultative zone of the reactor through the seco...

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Abstract

The invention discloses a sewage treatment technique for a membrane bioreactor, which can improve denitrification effect. The technique includes the steps that raw water enters an anoxic zone of a reactor; mixed liquid in the anoxic zone is sent to a simultaneous nitrification and denitrification (SND) zone in the reactor by a pump for the SND reaction; part of the mixed liquid in the SND zone issent to a membrane zone which is provided with a membrane component by a first overflow port while part of the mixed liquid returns to a facultative zone of the reactor by a siphon with a flowmeter; part of the mixed liquid in the membrane zone of the reactor is discharged after the filtering and purifying by the membrane component and part of the mixed liquid in the membrane zone returns to a facultative zone of the reactor by a second overflow port; the mixed liquid entering the facultative zone releases dissolved oxygen in the zone and then enters the anoxic zone by a third overflow port arranged in the facultative zone for the denitrification reaction. The invention has the advantages that the total nitrogen removal rate and the denitrification efficiency are improved and the energy issaved.

Description

technical field [0001] The patent of the present invention relates to a membrane bioreactor process for sewage treatment, especially a membrane bioreactor sewage treatment process with the function of removing total nitrogen. Background technique [0002] Membrane bioreactor (MBR) denitrification process is a process that combines membrane bioreactor (MBR) with aerobic nitrification and anoxic denitrification process. This process usually adds membrane modules in the aerobic section , to ensure the growth of nitrifying bacteria, to achieve the purpose of nitrification, and set an anoxic section before the aerobic section, and the sludge mixture in the aerobic section returns to this point, and mixes with the raw water entering this section, and utilizes the organic matter in the raw water As a carbon source and electron donor, it achieves the purpose of anoxic denitrification. However, the existing process often has some defects during operation, such as: first, the mixed s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F3/12C02F3/30C02F9/14
CPCY02W10/10
Inventor 邢锴张宏伟杜启云龙树勇
Owner TIANJIN UNIV
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