Cleanable security filter and its application

A security filter and filter technology, applied in ultrafiltration, chemical instruments and methods, semi-permeable membrane separation, etc., can solve the problems of difficult filter element blowing away, decrease of filter element flux, excessive filter element pore size, etc., to achieve reduction Operation and maintenance costs, extended replacement cycle, and the effect of extended service life

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of surface pollutants, the flux of the filter element will drop significantly, and the filter element in the filter cannot achieve surface filtration due to the defects of the manufacturing technology itself, which will easily lead to deep pollution
When the flux drops to a certain level, the reaction to the safety filter is that the operating pressure increases and the quality of the effluent water deteriorates. At this time, the filter element must be replaced, which increases the operation and maintenance costs.
[0005] At present, the filter elements used in industrial membrane devices have the following disadvantages: (1) The defect in the preparation process of the filter element itself makes the pore size of the filter element too large (generally about 5 μm), and the pore size distribution is uneven, resulting in low filtration accuracy of the filter element; (2) due to the The characteristics of the manufacturing process determine that the filter element cannot achieve surface filtration and is prone to deep pollution; (3) The service life of the existing industrial filter element is short. With the fluctuation of the water quality, it usually ranges from 2 weeks to 1 month and cannot be used for a long time. Frequent replacement of filter elements leads to a substantial increase in operating costs and labor costs
[0006] In view of the problems existing in the actual application of the current security filter element, such as the filter element is easy to form deep pollution, the filtration accuracy is not high, and the operation process is affected by the water quality and fluctuates greatly. At present, there are security filters that use compressed air for backwashing. , but the use of compressed air for backwashing requires high pressure of compressed air on the one hand, the pressure is too high, it is easy to damage the filter element, and the pressure is too small to achieve the purpose of backwashing. In addition, practice has proved that the effect of using compressed air for backwashing No, it is difficult for the air to completely blow away the impurities adhered to the filter element

Method used

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  • Cleanable security filter and its application
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  • Cleanable security filter and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The new filter element for security filtration in this example uses PTFE hollow fiber membrane as the main material, and the selected PTFE hollow fiber microfiltration membrane has a relatively dense outer surface, the average pore size of the microfiltration membrane is 1 μm, and the pore size distribution range is 0.5-1.5 μm , the length of the security filter element is 1m, and the effective membrane area of ​​each component is 5m 2 , The processing capacity of a single filter element is 3-5t / h, and the ratio of epoxy resin and curing agent at room temperature is 1:1.5 for curing and sealing. The filter element and security filter are sealed with O-rings to isolate the influent and product water, backwash water and cleaning water. The structure of the filter element and the structure of the security filter are respectively shown in figure 1 and 2 .

[0045] Adopt security filtration system of the present invention (see image 3 ):

[0046] Two groups of securit...

Embodiment 2

[0050] The main component of the new-type security filtration filter element in the present embodiment adopts the PVC hollow fiber membrane filter element of hydrophilic modification, and the hydrophilic PVC hollow fiber microfiltration membrane selected is that the outer surface is relatively dense, and the average pore size of the microfiltration membrane is 0.5μm, the pore size distribution range is 0.1-1.0μm, the length of the security filter element is 1m, and the effective membrane area of ​​each module is 8m 2 , the processing capacity of a single filter element is 4-6t / h, and the ratio of epoxy resin and curing agent at room temperature is 1:1 for curing and sealing before use. The filter element and security filter are sealed with O-rings to isolate the influent and product water, backwash water and cleaning water. The structure of the filter element and the structure of the security filter are respectively shown in figure 1 and 2 .

[0051] Adopt security filtrat...

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PUM

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Abstract

The invention relates to a security filter that can realize online automatic backwashing and its application. The invention solves the technical problems that currently used filter elements in industry have low filter precision, are easy to cause deep pollution, and cannot achieve long-term use through automatic cleaning. The security filter provided in the invention can mainly be used for a double-membrane system in the field of wastewater treatment by a membrane method, such as the security filtering measures in ultrafiltration and reverse osmosis systems, and also can be applied to circulating water replenishing and other water treatment processes with high requirements for filter precision and effluent water quality. The security filter can be used as an effective pretreatment filter means to reduce the influence of particles in water or water quality change caused by inflow water impact on stable running of follow-up processes, so that the effluent water quality can be improved to meet following water use requirements.

Description

technical field [0001] The invention relates to a security filter capable of realizing on-line automatic backwashing and an application system thereof, belonging to the technical field of membrane wastewater treatment and reuse. Background technique [0002] In recent years, with the increasing shortage of fresh water resources and the strengthening of environmental protection law enforcement, technologies related to water saving and emission reduction have been further promoted and applied in practical industrial applications. Among them, the advanced sewage reuse technology - membrane separation Technology has developed rapidly under the existing technical conditions and has been applied to many fields. In a sense, membrane separation technology has become one of the technical foundations for solving current energy, resource and environmental problems and achieving sustainable development. In my country, with the introduction of membrane technology and the deepening of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/02B01D61/18B01D65/02C02F1/44
Inventor 谢梓峰杨永强王玉杰奚振宇彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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