Water purification device using membrane filtration process

Abstract

The invention discloses a water purification device a using membrane filtration process. The water purification device comprises: a filter tank, which comprises a filtration zone and a sludge collection zone; a filtering membrane, which is arranged in the filtering zone; a filter material layer, which is arranged in the filtration zone and internally provided with a plurality of cleaning members;and a backwashing unit, which comprises a flushing assembly used for enabling the filtering membrane to discharge water from interior to exterior and a gas source assembly used for conveying gas intothe filtration zone. The cleaning members can disorderly impact the filtering membrane in a rolling manner under the action of air flow and / or water flow so as to realize cleaning of the filtering membrane; through the arrangement of the cleaning members, cleaning effect on the filtering membrane is better, cleaning efficiency is high, the consumption of water resources and energy sources is reduced, pollution to water quality and environment is avoided, and the damage rate of the filtering membrane is reduced; and the filter material layer enables better water purification effect to be obtained, prolongs the service life of the filtering membrane, and reduces the backwashing frequency of the filtering membrane.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a membrane filtration water purification device. Background technique [0002] In the past membrane filtration water treatment technology, pre-dosing and mixing are usually used to flocculate the flocculant and the colloidal impurities in the water into tiny particles, and then use the filter membrane to intercept and filter. After the filter works to a certain degree of blockage of the membrane, the It is necessary to implement surface cleaning and chemical cleaning of the filter membrane to restore the filtration function of the filter membrane. [0003] Most of the traditional membrane cleaning methods use air flushing or water flushing of the pollutants on the membrane surface, but no matter whether it is air flushing or water flushing on the surface of the filter membrane, the pollution adhering to the membrane surface cannot be removed due to the lack of friction on...

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Problems solved by technology

[0003] Most of the traditional membrane cleaning methods use air flushing or water flushing of the pollutants on the membrane surface, but no matter whether it is air flushing or water flushing on the surface of the filter membrane, the pollution adhering to the membrane surface cannot be removed due to the lack of friction on the surface of the filter membrane. If the cleaning effect is poor, there will always be some dirt adhering to the surface of the filter membrane, so that the water purification filter membrane cannot restore the normal filtering function, resulting in shortened filtration work cycle and reduced filtration efficiency. Over time, the filter membrane gradually Weaken or even block the micropores on the surface of the filter membrane and lose the filtering effect; and in order to restore the filter function of the membrane, the membrane module must be hung in a strong acid and alkali chemical pool for soaking and cleaning every time it is used. Therefore, it will affect the water quality ( Especially drinking water) and the ecological environment have caused serious pollution

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