Longitudinally-vibrating MBR corrugated membrane device

Abstract

The invention provides a longitudinal vibration MBR corrugated membrane device, and belongs to the technical field of membrane bioreactors. The longitudinal vibration MBR corrugated membrane device comprises a box body, wherein the upper portion of the box body is provided with a driving device, the box body is internally provided with a membrane module device, the driving device is connected withthe membrane module device through a connecting device and drives the membrane module device to do reciprocating motion in the box body in the vertical direction through the connecting device, a supporting frame is arranged on the rear side of the box body, the driving device is mounted at the top of the supporting frame, and the membrane module device comprises a membrane box and a plurality ofcorrugated membrane sheets arranged in the membrane box. According to the invention, aeration is replaced by vibration, so that the possibility of membrane blockage and pollution is reduced, membranepollution is relieved to a great extent, the cleaning frequency is reduced, and the operation period is prolonged; the vibration form enables a mixed solution to form a local anoxic environment, so that the effluent quality is improved, and the problem of continuous accumulation of hair in the end area is avoided; and in-situ cleaning can be adopted, only vibration is adopted, suction is avoided,mud cakes are removed, pollution is relieved, the offline cleaning period is prolonged, and the anti-pollution characteristic of the membrane module device is further improved.

Description

technical field [0001] The invention relates to the technical field of membrane bioreactors, in particular to an MBR corrugated membrane device that can alleviate membrane pollution, improve effluent water quality, and reduce energy consumption, and replaces longitudinal vibration of aeration with vibration. Background technique [0002] Organic matter and nutrients such as nitrogen and phosphorus in sewage and wastewater are discharged into natural water bodies, causing algae and other aquatic organisms to multiply, resulting in eutrophication of water bodies. Due to the high degree of dependence on surface water in our country's social water use, the problem of surface water quality has become one of the important obstacles affecting social and economic development. Membrane separation technology is an efficient material separation technology. Relying on the selective permeability of the separation membrane, water resources can be recovered from sewage. With the developme...

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Problems solved by technology

This will undoubtedly increase the energy consumption of the system, and will cause certain damage to the membrane, resulting in a shortened membrane life and increased costs in membrane replacement. Therefore, it is necessary to improve or develop a new way to alleviate membrane fouling.

[0004] The problems existing in the operation of Membrane bioreactor (MBR) are as follows: (1) High energy consumption of aerated MBR: MLSS in MBR tank is very high. To maintain sufficient oxygen transfer rate, the aeration intensity must be increased. At the same time, in order to increase the membrane flux and reduce membrane fouling, it is necessary to increase the flow rate and increase the aeration and scour, resulting in very high energy consumption of MBR.

(2) Aeration controls membrane fouling, the effect is poor: Membrane fouling is inevitable during the operation of MBR. Membrane fouling refers to the adsorption and accumulation of substances in the mixed solution on the surface of the membrane and in the pores of the membrane, causing the membrane pores to be blocked and the pores to be blocked. The rate becomes smaller, causing the decay of membrane flux and the process of increasing filtration pressure

When the aeration is too large, the particle size deposited on the surface of the membrane will decrease, making the structure of the filter cake more dense, thereby increasing the membrane filtration resistance; on the contrary, if the aeration is too small, the disturbance will be weakened, and the pollution will increase. To choose the appropriate amount of aeration or find a form of operation that can replace aeration

(3) The denitrification effect is poor: MBR has an aerobic environment due to the aeration system, which limits the denitrification rate and is not ideal for total nitrogen removal.

(4) During the operation of the hollow fiber membrane, hair will inevitably accumulate at the end of the membrane filament, which is difficult to clean and cannot be cleaned in situ. Working pressure range is small

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