Computing method of conversion relation between reverse osmosis unit area membrane water yield and reverse osmosis membrane element water yield

Abstract

The invention discloses a computing method of conversion relation between reverse osmosis unit area membrane water yield and reverse osmosis membrane element water yield. The computing method comprises the following steps: in the situation that the conditions of a membrane test and a component test are different, the unit area membrane water yield is obtained through converting the pressure and the inflow salt concentration of the membrane test into the pressure and concentration equal to those of the component test, so that the actual membrane water yield can be obtained. Compared with the prior art, the computing method has the advantages that when the computing formula of the conversion relation between the unit area membrane water yield and the membrane element water yield of the osmosis membrane element of a certain type is determined, an effective support can be provided for the fact that the water yield range value of the membrane element to be rolled is obtained through the membrane unit area water yield in the follow-up process, the membrane utilization rate can be increased, and the fact that an membrane element, meeting what kind of requirements, can be rolled by the membrane can be quickly judged according to the difference of the unit area membrane water yield.

Description

technical field [0001] The invention belongs to the field of reverse osmosis design basis and application technology, and in particular relates to a calculation method for the conversion relationship between the water production per unit area of ​​a reverse osmosis membrane and the water production of a membrane element. Background technique [0002] As the core component of water treatment, the reverse osmosis membrane is the key to realize the deep filtration in the field of water treatment. It is an artificial semi-permeable membrane with certain characteristics that simulates biological semi-permeable membranes. It is generally made of polymer materials. into. For example, cellulose acetate film, aromatic polyhydrazide film and aromatic polyamide film, etc. The diameter of the micropores on the surface is generally between 0.5 and 10nm, and the permeability has a certain relationship with the chemical structure of the membrane itself. With the continuous application of...

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Problems solved by technology

There are many factors that affect the water production rate in the performance of membrane elements: temperature, material and structure of water production channel cloth, number and arrangement of water collection holes in the water collection pipe, effective membrane area, water production per unit area of ​​the membrane, etc., the first few aspects The influencing factors are more dependent on the process design and raw material selection in the rolling process, and the water production per unit area of ​​the membrane becomes the decisive factor affecting the water production of the membrane element. The corresponding relationship between the water production per unit area of ​​the membrane and the water production of the membrane element has not been determined.

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