Reverse osmosis membrane cleaning agent and preparation and cleaning method thereof

Abstract

The invention discloses a reverse osmosis membrane cleaning agent and a preparation and cleaning method. The landfill leachate secondary RO membrane cleaning agent comprises the following raw materials in percent by mass: 7.6%-9.6% of thiosulfuric acid, 3.5%-5.5% of sodium sulfite, 0.04%-0.06% of sodium hydroxide, 0.005-0.015% of a surfactant, and the balance deionized water. Deionized water is injected into a corrosion-resistant mixing vessel, each component is weighed for standby application according to the mass percentage, the surfactant, thiosulfuric acid and sodium sulfite are successively added, the inorganic alkali is added, even mixing is performed by stirring at room temperature until all the components are dissolved, and the secondary RO membrane cleaning agent is obtained. Thestorage of a secondary RO membrane module is as follows: the secondary RO membrane module is steadily placed in a pressure vessel of a conventional cleaning system, and the cleaning is performed by using the secondary RO membrane cleaning agent according to the correct steps. The cleaning and restoring effect of the secondary RO membrane fouling blockage is relatively good, the cleaning time is shortened by more than 50% compared with the conventional cleaning time, the water flux of the membrane is restored by more than 98%, and the daily operation efficiency is greatly improved.

Description

[0001] Technical field: [0002] The invention relates to the technical field of sewage treatment, in particular to a reverse osmosis membrane cleaning agent and a preparation and cleaning method thereof. [0003] Background technique: [0004] With the continuous improvement of national energy conservation and emission reduction requirements and residents' requirements for drinking water quality, the domestic demand for water treatment, especially advanced water treatment, is becoming more and more urgent. As the core component of water treatment, the application of membrane will become more and more extensive. , the total market volume will also become larger and larger. [0005] At present, most of the landfill leachate treatment in the industry is a two-stage DTRO membrane process, and the two-stage RO membrane treatment leachate is a relatively mature process in the industry; landfill leachate characteristics: complex components, high organic content, high suspended solids...

AI Technical Summary

Problems solved by technology

Sulfur element is difficult to dissolve in water. Conventional acid cleaning agents and alkaline cleaning agents cannot dissolve and restore the membrane flux to maintain the designed water flow rate. Long-term operation of the equipment will cause high operating pressure, low water production, and poor water quality. The status quo of high energy consumption