Summary of membrane treatment technology standards.

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Due to the late development of China's separation membrane industry, there are relatively few national and industry standards introduced. Among them, there are 21 standards for membranes and membrane components, and 24 equipment standards related to membrane products, all of which are recommended standards. Except for 5 national standards, the rest are industry standards, with 27 being mainly marine industry standards.
As an important step in the development of the industry, standards play an important role in affirming existing achievements and guiding the direction of industry development, and have strong guidance. Therefore, the formulation of relevant standards plays an important technical support role in promoting the scientific and standardized management of the membrane industry, guiding its development towards a healthy and orderly direction, and promoting the widespread application of membrane technology.
Technical indicators of membrane products
There are various performance indicators related to membrane products, mainly including separation permeability, physical performance, and chemical performance. Among them, separation permeability includes: water yield, water flux, pure water permeability, intercepted molecular weight (cut molecular weight), interception rate, desalination rate, recovery rate, maximum pore size, average pore size, pore size distribution, porosity, airtightness, and integrity; The physical properties of the membrane include: structural properties (appearance, membrane area, membrane thickness, inner and outer diameter of the membrane filament), mechanical properties (tensile strength, bursting strength, bending strength, flexibility index, elongation at break), electrical properties (chargeability, Zeta potential), hydrophilicity (contact angle), and heat resistance (maximum operating temperature), etc; The chemical properties of the membrane include: chemical stability (chemical compatibility), oxidation resistance (short-term residual chlorine tolerance limit, hydrogen peroxide tolerance limit), acid and alkali resistance (operating and cleaning pH range), pollution resistance, etc.
The membrane separation and permeability performance reflects the applicability of the filter membrane, while the physical and chemical properties reflect the service conditions of the filter membrane. The membrane separation and permeability performance is the most important technical indicator of membrane products, and there are many related research and testing methods. It is also the main technical content of existing membrane product standards. The physical and chemical performance indicators of membranes, except for structural performance, are still blank in relevant standards.
Analysis of membrane and membrane component standards
Membrane products are classified into microfiltration (MF) membranes, ultrafiltration (UF) membranes, nanofiltration (NF) membranes, reverse osmosis (RO) membranes, and ion exchange membranes according to membrane separation processes; According to the classification of membrane component types, it can be divided into flat membrane, roll membrane, hollow fiber membrane (column type, curtain type), tube membrane, disc tube membrane, etc.
General standards
General standards include "Terminology of Membrane Separation Technology" (GB/T20103-2006) and "Model Naming of Membrane Components and Devices" (GB/T20502-2006). The GB/T20103-2006 standard defines common terms in the field of membrane separation, including electrodialysis, reverse osmosis, nanofiltration, ultrafiltration, microfiltration, gas separation membrane and ion exchange membrane, and 221 terms in the field of membrane separation technology, which are applicable to membrane and membrane materials, membrane components, liquid separation, gas separation and other membrane separation processes. The standard GB/T20502-2006 specifies the naming rules of membrane modules and device models, which are applicable to reverse osmosis, nanofiltration, ultrafiltration, microfiltration, gas separation membrane, electrodialysis and electrodeionization devices.
Reverse Osmosis (RO) Membrane Standards
There are four standards for reverse osmosis membranes:
Hollow Fiber

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