Concentrated filtering device and cleaning method of filter elements

Abstract

The invention relates to a concentrated filtering device and a cleaning method of filter elements. The concentrated filtering device comprises a filtering water tank, a filtering component, a water producing tank, a water intake pump and a back flush device, wherein the filtering component is arranged in the filtering water tank; the back flush device is used for back flushing the filtering component; the filtering component comprises a plurality of cylindrical filter elements which are arranged vertically and are parallel mutually; components playing a filtering role in the filter elements are filtering membranes; the plurality of filter elements are communicated with the water producing tank through a water generating pipeline so as to form a water producing passage; and the water producing passage is provided with a control valve; especially the back flush device comprises a gas generating device for providing gas to the filtering component so as to implement gas flushing for the filtering elements. According to the invention, a gas flushing back flush mode is adopted, the water producing rate can be improved, and the operation cost is lowered; and meanwhile, the device is simpler, the cost is lowered, and the operation is more convenient.

Description

technical field [0001] The invention relates to a cleaning method of a concentrated filter device and its filter element. Background technique [0002] With industrial progress and social development, water pollution has become increasingly serious and has become the world's number one environmental governance problem. The existing sewage treatment system has problems such as complex operation, high operating cost, poor treatment effect, etc., and the equipment process is complicated. [0003] Concentration and filtration devices in the prior art, such as the concentration and filtration device disclosed in the applicant's Chinese patent ZL201210215158.1, all use water for backwashing. However, due to the current market fiber membrane module, no matter it is tubular, roll or hollow fiber membrane, its filter membrane material is like a "sponge". Under certain conditions, about 1 / 3 of the monomers of colloidal macromolecules, microorganisms and suspended solids in the waste...

AI Technical Summary

Problems solved by technology

However, due to the current market fiber membrane module, no matter it is tubular, roll or hollow fiber membrane, its filter membrane material is like a "sponge". Under certain conditions, about 1 / 3 of the monomers of colloidal macromolecules, microorganisms and suspended solids in the wastewater will enter the pores of the membrane material "sponge", which will cause irreversible pollution of the membrane material and make the pores of the membrane material rate reduction

Water washing is used for backwashing, which has limited recovery of membrane flux

Especially in practical applications, in order to increase the filtration flux, the positive pressure operating pressure is generally greater than 0.2Mpa, and the negative pressure operating pressure is also greater than 0.05Mpa; under high pressure, the irreversible pollution of membrane materials is more serious, and any chemical Drugs can't remove all the blockages

In the existing water washing and backwashing method, due to incomplete membrane cleaning, the membrane flux will become smaller and smaller with use. On the one hand, the water production rate is limited; on the other hand, the operating cost of the device is relatively high

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