Testing method for de-boron rate of coiled seawater reverse osmosis membrane element

Abstract

The invention belongs to the technical field of reverse osmosis membrane separation performance testing, and discloses a testing method for the de-boron rate of a coiled seawater reverse osmosis membrane element. The seawater reverse osmosis membrane element is swashed with deionized water or distilled water at room temperature, then a boric acid test solution containing sodium chloride is prepared in a water tank of a reverse osmosis membrane element permeability testing device, and the pH value is adjusted; after the reverse osmosis membrane element is loaded into a membrane shell, the inletwater pressure, temperature and recovery rate are adjusted, prepressing is performed for a certain period of time under the conditions, inlet water and produced water of the testing device are respectively collected for multiple times and the concentrations of boron elements are analyzed, then the average value is used as the final boron concentration of the inlet water and the produced water, and the de-boron rate of the coiled seawater reverse osmosis membrane element is calculated. The requirements needing to be met by the reverse osmosis membrane element and the pretreatment method duringde-boron rate testing are definite, the concentration of the testing solution, the pH value, the inlet water temperature, the pressure and the recovery rate are controlled and defined, and the reliability of the testing method and the comparability and repeatability of the test results are improved.

Description

technical field [0001] The invention belongs to the technical field of separation performance testing of reverse osmosis membranes, and in particular relates to a method for testing the boron removal rate of roll-type seawater reverse osmosis membrane elements. technical background [0002] Seawater reverse osmosis membrane elements are widely used in seawater desalination, industrial wastewater treatment and other fields. The current seawater reverse osmosis membrane elements are mainly coiled aromatic polyamide membrane elements, which are rolled by reverse osmosis membranes, usually consisting of reverse osmosis membranes, central pipes, inlet screens, concentrated water screens and end screens. board composition. The reverse osmosis membrane is the main functional part of the coiled membrane element, which plays a major role in removing anions, cations and neutral molecules in water. [0003] Boron is an essential trace element for the growth and survival of humans, an...

AI Technical Summary

Problems solved by technology

However, so far, although researchers have a certain understanding of the test method for boron removal rate of seawater reverse osmosis membrane elements, they have paid little attention to the influence of test conditions on the test results, and even the formulation of some existing test methods seriously deviates from the seawater reverse osmosis The actual application conditions of the membrane element cause the test results to be inconsistent with the actual application performance

There are few reports about the correlation between the boron removal rate of seawater reverse osmosis membrane elements and the test conditions, and there is currently no systematic research and report on the influence of test conditions on the boron removal rate of seawater reverse osmosis membrane elements

This has resulted in the lack of reliability and scientificity of the current test method for boron removal rate of seawater reverse osmosis membrane elements, as well as the lack of comparability among different reverse osmosis membrane elements

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