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Aeration method and device for biological sewage treatment

A technology of biological sewage treatment and aeration method, which is applied in sustainable biological treatment, water/sludge/sewage treatment, water aeration, etc., can solve the problem of low oxygen utilization rate, etc., to improve oxygen utilization rate and realize cost , good mixing effect

Pending Publication Date: 2020-06-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, a sewage treatment plant using traditional methods such as aeration hole aeration costs a lot for aeration
This is because the oxygen utilization rate of the traditional aeration hole aeration method is very low

Method used

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  • Aeration method and device for biological sewage treatment
  • Aeration method and device for biological sewage treatment
  • Aeration method and device for biological sewage treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This example is an example in which aeration through hollow fiber membranes and aeration through aeration holes are carried out alternately in sewage treatment by biological methods. The process flow is as follows figure 1 and figure 2 shown. The hollow fiber membrane and the aeration hole are combined with the aeration process. The compressed air generated by the blower 1 is sent to the biological treatment tank 3 through the aeration pipe network 2, through the hollow fiber membrane aeration adjustment controller 5, and through the hollow fiber membrane pipe network. The branch pipe 16 enters the hollow fiber membrane 4, thereby entering the sewage with the bubble-free air 20, dissolving oxygen into the sewage, and supplying oxygen to the microorganisms. At the same time, the compressed air generated by the blower 1 enters the aeration hole 7 through the aeration hole aeration adjustment controller 6 to fill the sewage, forming large air bubbles rising to the water ...

Embodiment 2

[0044] In this embodiment, the aeration through the hollow fiber membrane and the aeration through the aeration holes are carried out at the same time, and the aeration through the aeration holes is an aeration process carried out alternately between different positions of the biological treatment tank, such as image 3 shown. It includes an aeration hole aeration blower 9 and a hollow fiber membrane aeration blower 10. The compressed air blown out by the hollow fiber membrane aeration blower 10 enters the biological treatment tank through the hollow fiber membrane 4 to dissolve oxygen in the sewage; the aeration hole aeration The compressed air blown by the blower 9 supplies air to the aeration hole pipe network. The aeration hole pipe network includes a plurality of branch pipes, and the aeration hole 7 sub-areas arranged in the biological treatment tank are respectively supplied with air by each branch pipe. Aeration hole aeration branch pipe control valves 8 are respective...

Embodiment 3

[0047] This embodiment is basically the same as Embodiment 1, the difference is that the hollow fiber membrane pipe network and the aeration hole pipe network are respectively connected with a blower, and the pressure of the compressed air blown out by the blower used for aeration of the hollow fiber membrane is higher than that of the aeration hole. The compressed air pressure of the gas blower is about 0.1MPa. When the aeration starts, the valves of the hollow fiber membrane pipe network and the aeration hole pipe network are opened at the same time, and the air volume aerated through the aeration holes is 1 / 5 to 1 / 3 of the air volume used for aeration with the simple aeration holes.

[0048] The hollow fiber membrane aeration tube in the tank can provide sufficient high-concentration oxygen for the biological treatment tank. At the same time, the aeration holes at the bottom of the pool can release a certain amount of air bubbles to provide sufficient stirring for the water...

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Abstract

The invention discloses an aeration method and device for biological sewage treatment. Hollow fiber membrane aeration and aeration hole aeration are alternately or simultaneously carried out, or hollow fiber membrane aeration and biological treatment tank bottom jet aeration are carried out alternately or simultaneously; the device for realizing the aeration method for biological sewage treatmentcomprises a biological treatment tank, an air blower, a hollow fiber membrane aerator, an aeration hole aerator and an aeration regulation controller; the hollow fiber membrane aerator and the aeration hole aerator are arranged in the biological treatment tank, and gas inlets of the hollow fiber membrane aerator and the aeration hole aerator are both connected to the air blower side; a valve is arranged on an inlet pipeline of the aeration hole aerator, and the opening and the opening degree of the valve are controlled by an aeration regulation controller. According to the invention, the oxygen utilization rate is improved, the aeration air consumption is reduced, good mixing of sewage and microorganisms can be realized, and the operation cost and equipment investment are reduced while good sewage treatment is achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an aeration method and device for sewage biological treatment. Background technique [0002] Hollow fiber membrane is a hollow fiber filament made of polysulfone and dimethylacetamide as raw materials. It is a membrane with selective permeability and self-supporting function. The use of hollow fiber membrane aeration is superior to other processes in many aspects, such as no noise during operation, simple operation, especially high oxygen utilization rate. The reason why the hollow fiber membrane can achieve high efficiency oxygen supply is that it can realize bubble-free aeration. Bubble-free aeration is also called bubble-free oxygen supply. It is to continuously pass additional air or pure oxygen into the lumen of the hollow fiber membrane, and the water flows outside the tube to keep the air pressure lower than the bubble point (that is, the air produced...

Claims

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Application Information

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IPC IPC(8): C02F7/00C02F3/02
CPCC02F7/00C02F3/02Y02W10/10
Inventor 张书廷曾锐王宇乾
Owner TIANJIN UNIV