Method and device of integral type hollow fibrous membrane bioreactor based on fluid mechanics

Abstract

The invention relates to a bioreactor, in particular to an integral type hollow fibrous membrane bioreactor, and discloses a method and a device of the integral type hollow fibrous membrane bioreactor based on fluid mechanics. The method comprises the following steps of: installing an aerator just below a membrane assembly; then sleeving a flowing guidance device outside the membrane assembly and the aerator, wherein the flowing guidance device separates polluted water around the membrane assembly and the aerator from a reaction tank so as to form a flowing guidance passage communicated from top to bottom, and the pumping action of a vacuum pump is correspondingly isolated in the flowing guidance passage; and installing a rectifying plate at the lower part of the flowing guidance device, wherein the rectifying plate can reduce sludge pumped into the flowing guidance passage and directly connecting the membrane assembly. The invention well controls the membrane assembly, improves the absorption property of the membrane assembly, strengthens the shearing action of staggered flow, preprocesses the sludge and further delays the pollution of a membrane, thereby greatly reducing the water braking power consumption and the staggered shearing power consumption of the membrane assembly and fundamentally delaying the surface pollution of the membrane.

Description

technical field [0001] The invention relates to a bioreactor, in particular to an integrated hollow fiber membrane bioreactor. [0002] Starting from the principle of fluid mechanics, the present invention adopts flow control method and technology to strengthen the integrated cross-flow hollow fiber membrane, which has achieved the purpose of reducing operating energy consumption, improving membrane pollution, and reducing operating costs, and forms a corresponding device . Background technique [0003] With the deteriorating situation of water resource shortage and the rapid development of membrane technology, wastewater reuse has become the ultimate goal of industrial wastewater and domestic wastewater treatment. At the same time, the reuse of wastewater can reduce pollutant discharge or even achieve zero discharge, which plays an extremely important role in water resource conservation and environmental protection. It is also a necessary condition for the survival of ente...

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Problems solved by technology

[0005] However, according to the principles of fluid mechanics, fluid mechanical equipment such as pumps or fans usually have a very limited range of action at the suction end. When the flow control technology is not used, the only way to strengthen the suction effect is to increase the lift of the capital or This will directly result in an increase in operating power consumption; at the same time, the membrane module itself is a component with high local resistance. In order to maintain the water flux to meet certain requirements, the acting pressure difference must reach the corresponding standard.

For the traditional integrated hollow fiber membrane bioreactor combined with flow control technology, the suction effect formed by the vacuum pump on both sides of the membrane module itself is limited, and due to the continuity of the flow, it will cause additional movement of the surrounding fluid, which will cause Consumption of power and further attenuation of suction

With the development of the actual treatment process, especially in the sewage treatment process, due to the existence of a large amount of granular sludge and micellar impurities, pollution will be formed on the membrane surface, which will further increase the local flow resistance of the membrane module, resulting in the suction effect. further deterioration, thus creating a vicious cycle of diminishing inhalation and increasing pollution

[0006] Of course, under the shear action of cross flow, the speed of membrane fouling can be considerably alleviated, but there is no essential improvement in the characteristics of the vicious cycle.

At the same time, because the traditional cross-flow aeration method does not properly organize the corresponding shear flow, the energy of this part of the aeration (jet end, with a large range of action) is also used to drive the high-speed flow of the surrounding flow field, which is different from the bioreactor. The function of the original aeration device is repeated, which causes waste, and at the same time, there is no targeted strengthening of the shearing effect. This is another main reason why it is necessary to use flow control technology to reduce the energy consumption of the integrated hollow fiber membrane bioreactor.

[0007] During the operation of wastewater treatment, there are a large amount of granular sludge, macromolecular solutes and micelles in the fluid environment of the bioreactor. The separation of these pollutants can only be achieved through membranes, or all the pollution loads in wastewater All of them are loaded on the surface of the membrane module, and the traditional one-piece cross-flow hollow fiber membrane module has not paid enough attention to this problem from design to application. It is believed that as long as the cross-flow conditions are suitable, the fouling of the membrane module controlling

In fact, the high shearing effect firstly corresponds to the high energy consumption of the operation, and secondly, the excessive shearing effect is not conducive to the service life of the membrane. These two problems put forward strict requirements on the aeration volume of the cross flow, or It is said that the amount of cross-flow aeration must be appropriate, and this appropriate degree needs to be based on the changes in the quality and flow of the treated wastewater, which is highly dependent on human experience. Then, through reasonable flow control technology, these pollution loads Pretreatment to reduce the separation load of the membrane should be a more effective way to improve the service life of the membrane module

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