Efficient scale inhibitor for membrane

Abstract

The invention discloses an efficient scale inhibitor for a membrane. The efficient scale inhibitor for the membrane is composed of the following components in percentages by mass: 2-10% of an acrylic acid-acrylamido-2-methyl propanesulfonic acid copolymer, 5-10% of 1-hydroxyl ethylidene-1,1-diphosphonic acid, 5-25% of polyepoxysuccinic acid, 1-5% of isothiazolinone and 60-85% of water. By employing the efficient scale inhibitor for the membrane, provided by the invention, the service life of a membrane system at least can be kept for more than three years; the salt removal rate of the membrane system is kept at over 90%; and the UF cleaning number of times can be reduced to 4-5 / year, the cleaning number of times for RO and NF membranes can be reduced to 1-2 / year, the water consumption for cleaning every year is about 1250m<3>-1900m<3>, and the cleaning water amount can be reduced by 55-70%. The efficient scale inhibitor for the membrane has remarkable environmental and social benefits.

Description

technical field [0001] The invention relates to a high-efficiency scale inhibitor for membranes, which belongs to the technical field of industrial water supply treatment and advanced wastewater treatment. Background technique [0002] Membrane separation technology was developed in the 1960s. Compared with traditional ion exchange desalination technology, it is simple to operate and has low operating costs, so it has been developed rapidly. However, there is a problem of membrane fouling during operation, which is vulnerable to Contamination by deposits, such as CaCO formation on the membrane surface 3 , CaSO 4 , Ca 3 (PO 4 ) 2 , BaSO4, SrSO4, CaF 2 And deposits such as metal oxides and silicic acid compounds will affect the normal operation of the membrane system device, and even lead to the scrapping of the membrane system in severe cases. The most common way to solve this problem is to add scale inhibitors to the water. Adding membrane scale inhibitors can effectiv...

AI Technical Summary

Problems solved by technology

[0002] Membrane separation technology was developed in the 1960s. Compared with traditional ion exchange desalination technology, it is simple to operate and has low operating costs, so it has been developed rapidly. However, there is a problem of membrane fouling during operation, which is vulnerable to Contamination by deposits, such as CaCO formation on the membrane surface 3 , CaSO 4 , Ca 3 (PO 4 ) 2 , BaSO4, SrSO4, CaF 2 And deposits such as metal oxides and silicic acid compounds will affect the normal operation of the membrane system device, and even lead to the scrapping of the membrane system in severe cases

The most common way to solve this problem is to add scale inhibitors to the water. Adding membrane scale inhibitors can effectively prevent the scaling problem of insoluble salts. Membrane scale inhibitors control the precipitation by delaying and distorting the growth of salt crystals. The process distorts the crystal during its formation, making it impossible to produce dense crystals

[0003] At present, the problems of membrane system chemicals in dealing with fouling are: 1. New pollution caused by excessive molecular weight; 2. Although scaling is reduced, the frequency of membrane tube cleaning has not been reduced; 3. Resistance The concentration of phosphorus in the scale agent is high, and it is easily hydrolyzed into orthophosphate to produce Ca 3 (PO 4 ) 2 Precipitation, and the high concentration of phosphate will definitely become a source of nutrients for microorganisms, which can promote the growth of bacteria and algae and accelerate membrane fouling; 4. There are also problems such as high price and high cost. Therefore, the research and development of scale inhibitors has always been a hot research topic.

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