Reverse osmosis membrane chemical cleaning system and method

Abstract

The invention belongs to the technical field of reverse osmosis membranes, and particularly relates to a reverse osmosis membrane chemical cleaning system and method. The chemical cleaning system comprises a first rinsing tank, a first washing tank, a second rinsing tank, a second washing tank, a third rinsing tank, a third washing tank, a fourth rinsing tank and a fourth washing tank, wherein the first rinsing tank is filled with a hydrophilic additive and an ester substance, the second rinsing tank is filled with a water-soluble acid solution, the third rinsing tank is filled with a strong oxidizing substance solution, the fourth rinsing tank is filled with glycerol and a surfactant, and the mass concentration of the strong oxidizing substance in the third rinsing tank is 0.01%-2%. The low-concentration oxidizing agent thoroughly cleans a small amount of residual amine on the membrane, improves the cleaning effect, effectively cleans organic matters and aromatic amine substances, avoids oxidation discoloration in the storage or use process, further improves the flux and desalination rate of the reverse osmosis membrane, and enhances the oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis membranes, and in particular relates to a chemical cleaning system and method for reverse osmosis membranes. Background technique [0002] Water resources are the basic resources for human survival and development, and are closely related to people's daily life. With the development of society, water resources have gradually become an important factor restricting the sustainable development of the economy. In the 21st century, water resources are becoming a precious commodity. Scarce resources and water resource issues are not only resource issues, but also a major strategic issue related to the long-term stability and sustainable economic and social development of various countries. The reverse osmosis technology uses membrane osmosis to separate fresh water from sea water. Because of its advantages of high efficiency, energy saving, wide application fields, and sustainable development, i...

AI Technical Summary

Problems solved by technology

[0003] In the production process of reverse osmosis membrane, due to the use of aromatic amines as raw materials, the produced membranes contain a large amount of residual amines and other organic substances, especially aromatic amines are prone to oxidation in the air, which makes the membranes easy to change color and affect The appearance of the element, while the properties of the polyamide layer change, reducing the performance and service life of the membrane

On the other hand, the chemical substances remaining in the components will also cause harm to human health during use

Traditional pickling can slightly reduce the content of residual amines, but the flux and desalination rate of the rinsing solution are reduced after treatment, and the effect is not obvious. The acid used has high requirements on the equipment, so the cleaning method needs to be changed

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