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

A technology of pulsed electric field and internal pressure membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as increasing processing costs and operational difficulties, affecting membrane service life, and polluting water inlets. Improve the degree of concentration polarization and membrane fouling, prolong the service life of the membrane, and reduce the total hardness

Active Publication Date: 2014-03-12
SOUTH CHINA UNIV OF TECH
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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

Method used

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

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Embodiment 1

[0027] A device that utilizes a pulsed electric field to strengthen internal pressure membrane filtration, including a casing, a hollow fiber membrane module 20 and a pulse power supply 21 inside, the casing consists of an upright cylinder 1 and upper and lower heads arranged at its two ends Composed of 2 and 3, the cylinder 1 and the heads at both ends are connected into one body by flanges.

[0028] The upper head 2 is provided with a permeate outlet 4, and the hollow fiber membrane module includes a membrane filament bundle composed of several membrane filaments 5 arranged in parallel and spaced apart, a cathode electrode 6, an anode electrode 7, and inlet and outlet covers 8, 9. The membrane tow is arranged in the cylinder body 1, and its two ends are fixed by upper and lower membrane heads 10, 11, and a water inlet cover 8 is arranged between the lower membrane head 11 and the lower sealing head 3, and the upper membrane head 10 is connected with the upper sealing head. A...

Embodiment 2

[0036] The influent is humic acid feed liquid, the content of humic acid is 20mg / l, the content of potassium chloride is 0.001mol / l, the pH is 6.5, the running time is 7h, and the cleaning time is 15min. The membrane module is composed of two membrane filaments. The membrane material is PVC, the length of the membrane wire is 26.5cm, and the filtration area is 0.003m 2, the cross-flow flow rate is 5ml / min, the pulse frequency is 10Hz, and the pulse duty cycle is 70%. The initial pressure difference was 26.3kpa (experimental group) and 26.5kpa (control group), and pulsed electric field (3V) was used to strengthen the filtration. After the operation, the pressure difference was 31.3kpa (increased by 19%); the filtration process without pulsed electric field , after the operation, the differential pressure was 33.2kpa (increased by 25.3%), that is, the pulsed electric field was used, the differential pressure rise slowed down, and the degree of membrane pollution was reduced; whe...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D65/08C02F1/44
Inventor 牛晓君闫新秀王彩虹
Owner SOUTH CHINA UNIV OF TECH
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