A kind of reverse osmosis chemical cleaning method

Abstract

The invention relates to a chemical washing method of reverse osmosis, which belongs to industrial wastewater processing technologies. The method which comprises four links of pickling, coarse alkali washing, fine alkali washing, and sterilization washing is characterized in that: a pickling washing agent added in the pickling link is citric acid with the weight of 120kg; an alkali washing agent added in the coarse alkali washing link is a mixture containing 60kg of sodium hydroxide and 6kg of sodium dodecanesulphonate, or a mixture containing 60kg of disodium ethylenediaminetetraacetate and 6kg of sodium dodecanesulphonate; and an alkali washing agent added in the fine alkali washing link is a mixture containing 50kg of MCT511, 30kg of disodium ethylenediaminetetraacetate, and 6kg of sodium dodecanesulphonate. The method of the present invention which allows organic pollutants and biomembrane scale deposits to be effectively washed has the advantages of system operation cost reduction, reverse osmosis membrane replacing frequency reduction, and resource saving.

Description

technical field [0001] The invention belongs to the industrial wastewater treatment technology and is mainly used for cleaning reverse osmosis elements. Background technique [0002] Reverse osmosis, as the name implies, is a process in which pressure is applied to a concentrated solution in contact with a semipermeable membrane, which is opposite to the natural osmosis phenomenon. That is, the operating pressure is applied on the side of the influent water flow (concentrated solution) to overcome the natural osmotic pressure. When the operating pressure higher than the natural osmotic pressure is applied to the concentrated solution side, the flow direction of the natural infiltration of water molecules will be reversed, and the influent water flow ( The part of the water molecules in the concentrated solution) passes through the membrane and is called the purified product water on the dilute solution side. The reverse osmosis membrane is a functional semipermeable membra...

AI Technical Summary

Problems solved by technology

During normal operation, the internal membrane of the reverse osmosis element will be polluted by inorganic salt scale, microorganisms, colloidal particles and insoluble organic substances. These pollutants are deposited on the membrane surface, resulting in a standardized product water flow rate and a decrease in the system rejection rate.