Reverse osmosis membrane assembly continuous cleaning device, and method utilizing device for reverse osmosis membrane assembly cleaning

Abstract

The invention relates to a reverse osmosis membrane assembly continuous offline cleaning device. The device comprises a plurality of cleaning tanks, and a driving and conveying device, wherein the cleaning tanks are used for soaking and cleaning reverse osmosis membrane assemblies, and are independent from one another; the driving and conveying device is used for driving the reverse osmosis membrane assemblies to be continuously cleaned in the cleaning tanks which are independent from one another. The offline cleaning method is adopted; the polluted membrane assemblies are soaked in the cleaning solution tanks, and parallel connection is adopted by the equipment for simultaneous and separate cleaning of the multiple membrane assemblies; a cleaning solution inlet end cover and one end of each membrane assembly are fixed on a double-chain through clamps, and the other end of each membrane assembly is fixed on the other side of the double-chain, so that the assemblies can be conveniently mounted, the complex assembly disassembly process is avoided, and labor conservation is achieved; an identical number of the membrane assemblies are mounted in each cleaning solution tank, the equipment automation level is improved through the chain transmission method, and the membrane assemblies in the different cleaning solution tanks are operated at the same time, so that the whole assembly line is continuous, the cleaning time is reduced, and the cleaning efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of cleaning equipment, in particular to a continuous cleaning device for reverse osmosis membrane components and a method for cleaning reverse osmosis membrane components using the device. Background technique [0002] Reverse osmosis technology is widely used in the water treatment industry. Its working principle is to use the pressure difference between the front and back of the membrane as the driving force, and use the selective permeability of the membrane to achieve the separation of solvent and solute. Due to the selective permeability of the membrane, the solute in the feed water concentrates on the surface of the reverse osmosis membrane, forming precipitates that adhere to the surface of the reverse osmosis membrane or block the pores of the reverse osmosis membrane, resulting in fouling of the reverse osmosis membrane and a decrease in the passage performance. Due to the difference in water qualit...

AI Technical Summary

Problems solved by technology

[0008] The utility model patent (No. ZL200420033221.0) describes a reverse osmosis membrane cleaning device, which has a relatively simple structure and can only monitor the conductivity of the influent water and the conductivity of the product water of the reverse osmosis membrane, but cannot give the reverse osmosis membrane. Therefore, it is impossible to judge the cleaning effect when using this device for chemical cleaning; in addition, since the device only has one cleaning solution container, it is necessary to repeatedly discharge waste and repeatedly configure different types of cleaning solution when performing acid and alkali alternate cleaning. The cleaning solution used in this device causes a large amount of waste of chemical reagents and pollutes the environment; there is no vent valve at the bottom of the cleaning solution container of the device, and it is difficult to completely discharge the cleaning solution; although multiple reverse osmosis components are arranged in parallel in this system, only a single one can be used for cleaning. Component cleaning cannot be cleaned in parallel at the same time. If it is cleaned in parallel at the same time, there will be the above-mentioned disadvantages of online cleaning

During the use of the reverse osmosis membrane, the back pressure of the diaphragm is required to be very low (Dow reverse osmosis membrane products require a back pressure of ≤0.35bar). The difference between the pressure and the surface pressure of the reverse osmosis membrane should not be too large, which increases the difficulty of reverse cleaning operation, and it is easy to break down the functional membrane of the reverse osmosis membrane element, resulting in the scrapping of the membrane element

In addition, the device can clean multiple original reverse osmosis membranes at the same time, and its effect is similar to the online cleaning process of reverse osmosis membranes, but the cleaning effect is not ideal

[0010] A multi-functional reverse osmosis membrane off-line cleaning device (200510016025.1) can also realize reverse osmosis membrane fresh water backwashing, and can also provide some performance parameters after reverse osmosis membrane cleaning, but because the device simultaneously cleans multiple reverse osmosis membranes in parallel Components, the reverse osmosis membrane that causes serious pollution cannot be thoroughly chemically cleaned; the conductivity meter is installed at the total pure water outlet and the total concentrated water outlet, and the performance of desalination and water production can reflect the parameters of the entire cleaning system, while It is not the performance parameters of a single reverse osmosis membrane, and the test results cannot judge whether the cleaning effect of each reverse osmosis membrane is good or bad; in addition, the fresh water generated by the system does not flow back to the cleaning solution container, so that the concentration of the cleaning solution gradually increases

The eluted pollutants will lead to a gradual increase in the concentration of pollutants in the cleaning solution. There is no filter device when the cleaning concentrated water returns, causing the cleaned particulate matter to enter the interlayer of the membrane module again, which may cause damage to the surface of the membrane.

[0011] The off-line reverse osmosis membrane cleaning device described in the utility model patent (ZL200620108379.9) is equipped with a cleaning liquid container, which cannot realize rapid replacement of different cleaning liquids, and the preparation and discharge of cleaning liquids are also relatively difficult, and it is impossible to waste chemical reagents. Realize the reverse flushing process of pure water

Due to the complexity of the pipeline membrane shell system and the large internal space, the amount of clean water required for flushing is large, which greatly increases the amount of cleaning liquid and clean water, resulting in waste of cleaning agents and clean water and increased cleaning costs, and the discharge of diluted cleaning liquid causes environmental pollution. question

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