Continuous damping real-time on-line linear backwashing high-flux disc-type micro-screen assembly

Abstract

The invention relates to a continuous damping real-time on-line linear backwashing high-flux disc-type micro-screen assembly and is characterized in that a filtration box is a disc-shaped filtration box formed by a ring enclosure frame and micro-screen matrixes packaged on two end faces of the enclosure frame; a backwashing water conveyance rotating shaft which is perpendicular to the disc surface and is equipped with a middle-set water inlet chamber is arranged at the center of the filtration box; a central rotating disk and micro-screen matrix inner and outer clamping discs are sleeved on the backwashing water conveyance rotating shaft; a radial damping backwashing pipe and a plurality of water collection pipes are uniformly distributed around the inner ring of the box; one end of the damping backwashing pipe is inserted in a slot of the central rotating disk and the other end is fixedly connected with a glider which slides along a slide rail of the ring enclosure frame; two sides of the damping backwashing pipe facing the micro-screen matrixes are equipped with backwashing spray orifices and damping scraper plates which wrap the backwashing spray orifices and close to form duckbilled water nourishing slits; and a produced water flowing channel is formed between the ring enclosure frame and the glider; and a produced water outlet is disposed at the bottom of the ring enclosure frame. The invention has advantages of high flux of produced water, stable water quality and low cost, and is applicable to be applied at scale.

Description

technical field [0001] The invention relates to a membrane module for a membrane bioreactor process in the field of sewage and wastewater treatment, in particular to a continuous vibration reduction real-time online linear backwashing high-flux disc micro-grid module. Background technique [0002] In recent years, research on micro-network dynamic membrane separation technology has begun to appear in the field of membrane bioreactor MBR, which is characterized by the use of ordinary porous materials, usually referring to micro-screens with a pore size of more than 200 mesh (commonly referred to as micro-networks in the industry) to make micro-networks. Modules replace traditional microfiltration or ultrafiltration membrane modules to form a new type of micro-screen Dynamic Membrane Bio-Reactor (DMBR for short). [0003] The micro-grid component is mainly composed of a box that completes microfiltration, a backwash mechanism, and a water collection mechanism. The existing box...

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Problems solved by technology

[0004] However, the technology is currently immature and is still in the research and development stage

There are mainly the following disadvantages: ①The problem of normal vibration. The disturbed water flow in the membrane bioreactor is a necessary condition for the formation of the mixed liquid, but the vibration brought by this water flow will cause the normal vibration of different amplitudes and frequencies on the micro-mesh surface ; This irregular vibration has adverse effects on the attachment and growth of the dynamic membrane on the micro-net matrix: it reduces the adhesion of the membrane layer, uneven growth, and uneven thickness of the gel layer. It falls off and creates a "loophole", which leads to unstable water quality of the produced water, that is, the produced water

②Continuous 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. During the working process, the flux gradually decreases until the flux is so small that it is difficult to meet the production needs; in this way, the dynamic film and mud cake layer must be thinned or even removed. Accounting for a large proportion of produced water) or mechanically brushing off the membrane layer, so that the dynamic membrane cannot work continuously, affecting the water production rate, and it is also accompanied by the problems of large equipment investment and energy consumption

③ Irregular shedding of the membrane. As time goes by, the dynamic membrane ages until it loses its viscous shedding, resulting in "loopholes", causing colloidal substances and suspended substances with small particle sizes to be mixed into the production water. The above problems still hinder the formation of large-scale DMBR technology. application

During the filtration process, the osmotic pressure of membrane filtration increases continuously with the increasing density of the dynamic membrane layer. Under normal working conditions, due to the sewage pressure into the mesh, the mesh surface on both sides is concave and closed, increasing the friction in the cavity. Resistance, causing the mechanical components to move in the cavity needs to consume more power, and it is also likely to cause damage to the micro-grid; at the same time, it also makes the volume of the cavity smaller, reducing the volume of water passing through the membrane, and cannot achieve high-flux water discharge

If the distance between the micro-grid matrix on both sides of the component is increased, the volume of the component will be increased, especially in the application of small micro-grid components, which will affect the packing density of the component in the application; Internal release, the micro-mesh matrix is ​​convex outward, which affects the backwashing effect

If the micro-grid is stretched too tight, it will also cause deformation of the surrounding frame of the fixed micro-grid. The deformation of the surrounding frame will bring great difficulties to the implementation of distributed vibration reduction and linear continuous backwashing techniques. Although the rigidity of the surrounding frame material will be increased The degree of deformation can be reduced, but this will increase the consumables of the micro-grid components and increase the cost of the components

Due to the above shortcomings, the square frame is not suitable for enlarging the area of ​​the micro-mesh matrix, which affects the improvement of production water flux.

In short, the above-mentioned factors make the work of the micro-grid components unable to be in a stable working state, the production water flux is low, the flux and water quality are unstable, and the operating cost is high, which restricts the micro-grid dynamic membrane technology from really "going out" of the laboratory. Enter the field of engineering application

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