Continuous dynamic membrane system operation device and working method thereof

Abstract

The invention discloses a continuous dynamic membrane system operation device, which comprises a supporting membrane, a water inlet collecting tank, a peristaltic pump, a water inlet, a water outlet,a water outlet collecting tank, a backwashing water pump, a backwashing air pump, a backwashing water inlet, a backwashing water outlet, a backwashing water collecting tank, a pressure sensor and a processor; when the actual measurement pressure value exceeds a preset pressure value threshold value, the processor calculates according to the actual measurement pressure value and a preset pressure value standard value to obtain strength values and flushing duration of the backwashing water pump and the backwashing air pump; when the loosening value of the dynamic membrane layer above the supportmembrane reaches a preset condition, the loosening membrane layer is washed off by adopting a backwashing water pump to enable the error between the transmembrane pressure of the washed dynamic membrane and the standard value of the pressure value to be less than a preset error threshold value. The invention has the advantages of high backwashing efficiency and high dynamic membrane recovery speed, and indirectly enhances the operating efficiency of the whole dynamic membrane filtration system.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a continuous dynamic membrane system operating device and a working method thereof. Background technique [0002] Dynamic membrane filtration technology is an emerging membrane separation technology, which is mainly used in sewage treatment. The core of dynamic membrane filtration technology is the formation of a dynamic membrane layer. Its supporting membrane components are usually composed of cheap macroporous micro-network materials. By pre-coating or gradually trapping micro-particles or pre-coating materials in sewage on the supporting membrane, they gradually A dynamic film layer is formed to obtain a good separation effect. [0003] Dynamic membrane technology can be divided into three stages according to the change law of transmembrane pressure and effluent turbidity: formation stage, filtration stage and backwash stage. When the influent flow rate and influent ...

AI Technical Summary

Problems solved by technology

Air washing is to install an aeration system under the membrane module to achieve the effect of scouring and cleaning the dynamic membrane through aeration to slow down the membrane fouling, but the aeration time is longer, which prolongs the cleaning time of the system

Some device systems use continuous aeration to delay membrane fouling, which obviously consumes a lot of energy

Off-line water washing is to take out the clogged membrane module and directly flush it with high-pressure water to remove membrane pollution. The process is more complicated and the intermittent time is long.

For example, a dynamic membrane water treatment device has been reported in the patent No. CN2403733Y. The invention is provided with a dissolved air tank and a recirculation reflux tank to slow down membrane fouling by releasing the dissolved air in the sewage to make the filter cake loose, but There are more steps of dissolving gas and circulating reflux, the operation interval is long, and the operation is complicated

Patent CN1843971A reports a backwashing operation method of a dynamic membrane bioreactor. This invention adopts an uninterrupted aeration method, which slows down the formation rate of the dynamic membrane, but the intermittent operation time is long and the power consumption is large.

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