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A method for treating sewage in a multistage aerated membrane bioreactor

A membrane bioreactor and water treatment technology, applied in the field of water treatment, can solve the problems of easily destroying the formation conditions of anaerobic nitrification and easily polluted membrane components.

Active Publication Date: 2022-04-05
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a method for treating sewage in a membrane bioreactor with multi-stage aeration, aiming at the shortcomings of the existing technology that the membrane module is easily polluted and the conditions for anaerobic nitrification are easily damaged.

Method used

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  • A method for treating sewage in a multistage aerated membrane bioreactor
  • A method for treating sewage in a multistage aerated membrane bioreactor
  • A method for treating sewage in a multistage aerated membrane bioreactor

Examples

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Embodiment 1

[0030] A method for treating sewage in a multistage aerated membrane bioreactor, the steps comprising:

[0031] 1) The water to be treated enters the reactor shell 1 through the water inlet 11 at the bottom of the reactor shell 1, and the water to be treated flows upward along the reactor shell 1;

[0032] 2) The water to be treated passes through the lower aeration layer at the lower part of the reactor shell 1 to carry out the sludge pneumatic stirring treatment under the condition of not destroying the anoxic environment. The lower aeration layer is provided with a plurality of lower aeration tubes 212, and the lower aeration The trachea 212 is equipped with a regulating valve 210, through which the aeration volume of each height in the lower aeration layer can be adjusted;

[0033] 3) The water to be treated flows into the upper aeration layer on the upper part of the reactor shell 1, and an upper aeration tube 211 is installed in the upper aeration layer, and the upper ae...

Embodiment 2

[0042] Same as Example 1, the difference is that while step 2) is carried out, a sludge return step is also included, and the sludge positioned in the lower aeration layer is circulated up and down in the lower aeration layer through the sludge return step, and the sludge return The step is to return the sludge through the return pipe 4 connected to the upper and lower ends of the lower aeration layer, and the sludge at the lower end of the lower aeration layer is moved to the upper end of the lower aeration layer through the return pipe 4 .

[0043] The return pipe 4 includes an inlet pipe 43 and an outlet pipe 41, the outer end of the inlet pipe 43 and the outer end of the outlet pipe 41 communicate with each other, and the inner end of the inlet pipe 43 and the inner end of the outlet pipe 41 are all communicated with the inside of the reactor shell 1 , the inner end of the inlet pipe 43 is located on the upper side of the lower aeration pipe 212, and the inner end of the ou...

Embodiment 3

[0048] Same as Example 1, except that in step 1), the water to be treated is in contact with the sludge agitating pneumatic device 5 at the bottom of the reactor shell 1, and the sludge agitating pneumatic device 5 performs pneumatic agitation of the sludge and the water to be treated , so that the sludge at the bottom of the reactor shell 1 is in a slow flow state.

[0049] The upper aeration pipe 211 and the lower aeration pipe 212 are connected with an aeration main pipe 21, and the aeration main pipe 21 transports gas to the upper aeration pipe 211 and the lower aeration pipe 212. The sludge stirring pneumatic device 5 is a hollow structure and is connected with the aeration main pipe. 21 is connected, and the sludge stirring pneumatic device 5 also aerates the sludge while stirring the sludge.

[0050] Using the inventor's sludge stirring pneumatic device 5, at the bottom of the reactor shell 1, through the pneumatic stirring technology as shown in the figure, the sludge ...

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Abstract

The invention relates to the field of water treatment, and discloses a method for treating sewage in a multi-stage aerated membrane bioreactor. The steps include: 1) entering the water to be treated into the reactor shell (1) through a water inlet (11); 2) The water to be treated passes through the lower aeration layer to carry out the sludge pneumatic stirring treatment under the condition of not destroying the anoxic environment; 3) The water to be treated flows into the upper aeration layer on the upper part of the reactor shell (1), and the water to be treated is Aerobic aeration treatment; 4) The water to be treated through the aerobic aeration treatment of the upper aeration pipe (211) is discharged from the water outlet (12). In the present invention, the water quality is controlled adaptively in the A / O section, the sludge reflux section, and the strong-shear interlaced flow section, and the corresponding components are fully degraded through the biodegradation section; sludge is separated based on gravity separation + mechanical separation (biological film hanging) and other components to create a good environment for the membrane section; membrane module interception and separation based on strong shear cross flow; each module in the reactor can be disassembled for maintenance.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for treating sewage in a multi-stage aerated membrane bioreactor. Background technique [0002] The integrated membrane bioreactor integrates membrane separation technology and biodegradation technology, which not only saves the construction of secondary sedimentation tanks, but also greatly improves the efficiency of solid-liquid separation, and based on membrane separation, the concentration of activated sludge in the reactor Increase, as well as the emergence of special bacteria (especially the dominant flora), increased the rate of degradation of biochemical reactions. [0003] From the perspective of technical principles, in membrane bioreactors, due to the separation of membranes, soluble macromolecular compounds with a long degradation time must be intercepted and returned to the bioreactor for further degradation, that is, the corresponding hydraulic retention time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/30
Inventor 朱文芳王小华
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY