Method for cleaning spiral-wound membrane for water treatment

Abstract

The invention discloses a spiral-wound membrane cleaning method for water treatment. The spiral-wound membrane cleaning method comprises the following steps: S1, preparing a cleaning solution; s2, heating the cleaning liquid; s3, performing low-flow circulation; s4, performing sectional cleaning, namely performing second-section reverse cleaning on the membrane device, performing first-section reverse cleaning on the membrane device, performing second-section forward cleaning on the membrane device, performing first-section forward cleaning on the membrane device, and observing circulating flow; s5, performing low-pressure flushing, performing valve switching on the first section of the membrane device and the second section of the membrane device, performing flushing by using a low-pressure flushing system, and performing standby application or commissioning after qualification; and S6, discharging the cleaning liquid, namely discharging the effluent of the security filter to a cleaning waste liquid pool, emptying the cleaning liquid in a cleaning water tank and a pipeline to prepare for next cleaning, and when the liquid level in the cleaning waste liquid pool is too high, sending the effluent to other devices for treatment. According to the scheme, a reverse and forward sectional switching cleaning method is adopted, the spiral-wound membrane element water passing channel is cleaned more effectively, and the cleaning effect is improved.

Description

technical field [0001] The invention relates to the technical field of roll membrane cleaning, in particular to a roll membrane cleaning method for water treatment. Background technique [0002] With the increasing shortage of water resources, protecting water sources and controlling water pollution is not only a global problem, but also an urgent task faced by urban and rural areas in my country. The application of the membrane system in water treatment is a key technology for reuse of recycled water, optimization of water quality and reduction treatment, as well as an effective technology for improving the quality of production and domestic water. [0003] In the practical application of water treatment membrane technology, due to different influent water quality conditions, as well as improper control and cleaning operations, the phenomenon of frequent fouling and cleaning is difficult, especially in some industrial wastewater treatment, which is more serious, not only se...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for cleaning the roll-type membrane for water treatment, so as to improve the difficulty in cleaning after the fouling of the roll-type membrane in water treatment in the related art, and the performance of the membrane element cannot be effectively restored, which not only affects the service life of the membrane element, but also Affect the production load, resulting in a significant increase in costs

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