Automatic cleaning method for super filter film in waste water treating system
A sewage treatment system and automatic cleaning technology, applied in the direction of ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problems of practical constraints and insufficient cleaning strength, and achieve the effect of improving efficiency and quality, and simplifying related operations
Inactive Publication Date: 2008-12-24
BEIJING MATSUSHITA COLOR CRT CO LTD
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However, this method uses permeate to reversely clean the membrane surface. For heavily polluted ultrafiltration membranes, the cleaning strength may not be enough, so it is still subject to certain restrictions in practicability.
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[0030] In the existing sewage treatment system, the ultrafiltration membrane is generally cleaned manually, which has low efficiency and troublesome operation. Therefore, the present invention proposes an automatic cleaning method for ultrafiltration membranes. This is explained in detail below.
[0031] figure 1 Shown is a schematic diagram of the overall structure of a sewage treatment system for implementing the method of the present invention. In this sewage treatment system, the basic system composition is not much different from the sewage treatment system commonly used now, and it is also composed of three parts: pretreatment unit, reverse osmosis unit and electric desalination unit. Among them, the multi-media filter, ultrafiltration equipment and activated carbon filtration equipment constitute the pretreatment unit. Through the pretreatment unit, the SDI value of sewage can be made less than 1. The first stage of the two-stage reverse osmosis equipment can achiev...
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The automatic cleaning process of ultrafiltering film in waste water treating system includes the following steps: 1, gas washing the ultrafiltering film; 2, draining dirty water from the ultrafiltering apparatus; 3, back flushing with clear water flowing from the water producing channel to the concentrated water channel; 4, forward flushing to clean ultrafiltering film in running state; 5, mixing water and chemical in set time; 6, injecting cleaning chemical into ultrafiltering film and backflow to the cleaning water tank; 7, chemically cleaning the concentrated water channel and film surface with cleaning chemical circularly; 8, washing the ultrafiltering film and pipeline to eliminate residual chemical with water; and 9, draining the cleaning liquid from the pipeline and cleaning tank to finish cleaning. The said process has simplified operation, obviously raised cleaning efficiency and cleaning quality.
Description
technical field [0001] The invention relates to a method for automatically cleaning an ultrafiltration membrane in a sewage treatment system, belonging to the technical field of sewage treatment. Background technique [0002] The existing sewage recycling technology has been developed for many years, and the basic technological process has been relatively mature. Generally speaking, the sewage treatment system can be divided into three parts: pretreatment unit, reverse osmosis unit and electric desalination unit. The role of the pretreatment unit is to convert industrial sewage into relatively clean reclaimed water for desalination in the reverse osmosis unit. Ultrafiltration technology is mainly used in pretreatment units. [0003] Ultrafiltration (Ultra Filtration, referred to as UF) is a solution under pressure, the solvent and some low-molecular-weight solutes pass through the micropores on the membrane to reach the other side of the membrane, while the high-molecular ...
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IPC IPC(8): B01D65/02B01D61/20
Inventor 郭晓东张志国
Owner BEIJING MATSUSHITA COLOR CRT CO LTD