Rotating disc type micro-grid assembly for backwash-free dynamic membrane

Abstract

The invention relates to a rotating disc type micro-grid assembly for a backwash-free dynamic membrane. The rotating disc type micro-grid assembly comprises a circular-disc shaped filter tank, wherein the interior of the filter tank is a micro-grid cavity; the rotating disc type micro-grid assembly is characterized in that a micro-grid base material is an outer micro-grid; the filter tank is an outer filter tank; a central water outlet pipe perpendicular to a disc surface of the outer filter tank is arranged on a circle center part of the outer filter tank; a water outlet rotating disc which is matched with the central water outlet pipe in a sliding mode is sleeved on the central water outlet pipe; clamping discs which are fixedly connected with the central water outlet pipe and are fixed on two sides of the outer micro-grid are respectively sleeved on two sides of the water outlet rotating disc; a circular-disc shaped inner filter tank which is connected with the water outlet rotating disc is arranged in the outer filter tank coaxially; teeth are circumferentially arranged outside the inner filter tank; a disturbance water catchment channel is arranged in the outer filter tank; a transmission gear engaged with the teeth are arranged in the outer filter tank; a rotational vibration attenuation brush plate of which a plurality of brush hairs are in contact with the back side of the outer micro-grid is arranged on the inner micro-grid surface which covers the disc surface of a water receiving disc; and a disturbance water drainage nozzle is arranged on the bottom of the outer filter tank. The rotating disc type micro-grid assembly has the advantages of stability in yielding water quality, high flux, high water production rate and simplified facilities.

Description

Technical field [0001] The invention relates to a membrane module used in a membrane bioreactor process in the field of sewage and wastewater treatment, in particular to a rotary disk type non-backwashing dynamic membrane micro-membrane module. Background technique [0002] Dynamic Membrane (DM), also known as dynamic formation membrane or secondary membrane, is a new membrane layer formed by the deposition of particles on the surface of the porous carrier through filtration of the deposited material. The use of DM for solid-liquid separation is A special membrane separation method. Dynamic Membrane Bio-Reactor (DMBR) is based on traditional polymer membrane bioreactor (Membrane Bio-Reactor, MBR). In the bioreactor, the aerobic mixture in the liquid Activated sludge and other colloidal particles automatically generate a gel layer and a dynamic membrane layer on the micro-mesh carrier to carry out solid-liquid separation of a new type of advanced sewage treatment method. The memb...

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Problems solved by technology

[0003] However, the technology is currently immature and still in the research and development stage

The main disadvantages are as follows: (1) The problem of normal vibration, the vibration caused by the disturbed water flow in the dynamic membrane bioreactor will cause the normal vibration of different amplitudes and frequencies on the micro-grid surface; Adhesion and growth on the micro-mesh matrix have adverse effects: it reduces the adhesion of the film layer, uneven growth, and the thickness of the gel layer varies. Unstable water quality

⑵Continuous work and backwashing problems. During the use of the dynamic membrane, due to the continuous accumulation of mud cake layer and the formation of gel layer on the surface, the dynamic membrane layer is constantly thickened and dense, so that the flux of the micro-grid module during the working process so that it is difficult to meet the production needs; in this way, the dynamic membrane and mud cake layer must be thinned or even removed, the work needs to be suspended, and a large amount of production water is used for backwashing. Since the dynamic membrane cannot work continuously, the water production rate is affected, and it is also accompanied by There are problems of high equipment investment and large energy consumption

(3) Irregular shedding of the dynamic membrane. As time goes by, the dynamic membrane ages until it loses its viscous shedding, resulting in "loopholes", resulting in the mixing of colloidal substances and small particle-sized suspended substances into the production water. The above problems still hinder the formation of DMBR technology. Scale application

However, the use of this micro-mesh module still requires backwashing operation, the process is complicated, the time is long, and the water consumption is large, resulting in low water yield; in addition, the membrane structure of a single micro-mesh layer makes the dynamic membrane in the cavity The suspended solids formed by regular shedding cannot be effectively filtered out, which still makes the quality of the effluent unstable

In short, the above-mentioned factors make the work of the micro-grid components not in a stable working state, and the operating cost is high, which restricts the micro-grid dynamic membrane technology from really "going out" of the laboratory and entering the field of engineering applications.

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