Device and method for strengthening filtering of internal-pressure membrane by using pulsed electric field

Abstract

The invention discloses a device and a method for strengthening filtering of an internal-pressure membrane by using a pulsed electric field. The device comprises a shell, a membrane assembly and a pulse power supply, wherein the shell is provided with a penetrating fluid outlet; the shell is composed of a barrel and end sockets at the two ends; the membrane assembly comprises a membrane bundle, a negative electrode, a positive electrode, a water inlet cover and a water outlet cover; the membrane bundle is composed of a plurality of membranes which are arranged at intervals in parallel; the membrane bundle is arranged in the barrel and the two ends of the membrane bundle are fixed by membrane heads; the water inlet cover is arranged between one membrane head and the end socket at the end; the water outlet cover is arranged at the other membrane head and the end socket at the other end; water inlets and water outlets of the water inlet cover and the water outlet cover respectively stretch out of the two end sockets; the negative electrode and the positive electrode which are vertical to the membranes are arranged in the water inlet cover and the water outlet cover respectively; a gap is formed between the negative electrode and one membrane head and a gap is formed between the positive electrode and one membrane head; the negative electrode and the positive electrode are connected with the pulse power supply; the membranes are hollow fiber internal-pressure membranes. According to the device and the method, different pulse electric fields are respectively applied in the filtering and washing processes; the filtering condition can be improved, the washing effect is strengthened and the service life of the membrane is prolonged.

Description

technical field [0001] The present invention relates to a membrane separation method, in particular to an enhanced treatment method and its device in the membrane separation technology, in particular to a method for delaying the membrane fouling rate during hollow fiber internal pressure membrane operation and enhanced cleaning during cleaning. A device and method for operating electric field coupling. Background technique [0002] With people's ardent demand for water quality, membrane separation and filtration technology is playing an increasingly important role in our lives. Ultrafiltration, microfiltration and nanofiltration are membrane separation technologies that are increasingly valued in the field of water treatment. They have a good filtration effect on colloids, small particles, bacteria and some organic substances in water. They have no phase change, normal temperature or low temperature operation, and can Low consumption and other advantages. However, the memb...

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Problems solved by technology

However, the internal pressure membrane has high requirements on the quality of the influent water, and its toughness is poor. The effect of conventional hydraulic flushing is limited, and the pollution of the water inlet is serious.

[0004] In response to the above problems, the current conventional treatment methods are to increase the cross-flow rate, increase the cleaning frequency, and use pretreatment to alleviate it. However, increasing the cross-flow rate and cleaning frequency will cause greater damage to the membrane and seriously affect the service life of the membrane. The pretreatment method will increase the processing cost and operation difficulty

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