GB/T 38511-2020Evaluation method of service life for hollow fiber membrane (English PDF)
中空纤维膜使用寿命评价方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 6, 2020
Implementation date
February 1, 2021
Scope
GB/T 38511-2020 is the English-translated version of 中空纤维膜使用寿命评价方法.
GB/T 38511-2020 specifies the method for evaluating the service life of hollow fiber membranes used for water treatment. Clause 1 states that it applies to the evaluation of the service life of hollow fiber ultrafiltration membranes and hollow fiber microfiltration membranes for water treatment, and writes no exclusion.
Clause 2 cites GB/T 6682 on water for the analytical laboratory and GB/T 20103 on the technical terms of membrane separation.
Clause 3 takes the terms defined in GB/T 20103 together with its own and prints five of them: the hollow fiber membrane, a fibrous, hollow, self-supporting membrane; the microfiltration membrane, a separation membrane with a mean pore diameter of 0.01 micrometres or more; the ultrafiltration membrane, built of a very thin epidermal layer and a thicker sponge-like or finger-like porous support layer; the flux, the amount of permeated component per unit membrane area per unit time; and the transmembrane pressure difference, the pressure difference between the water inlet side and the water production side of the membrane.
Four of these five definitions are marked as repeated from GB/T 20103-2006. The draft on the page stops at the end of clause 3, and there is no contents list, so the titles of the clauses that carry the evaluation procedure itself are not shown.
The foreword states that the standard is proposed and managed by the National Technical Committee for Standardization of Separation Membrane (SAC/TC382). It was issued on 2020-03-06 and has applied since 2021-02-01.
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Document preview — GB/T 38511-2020
National Standard of the People's Republic of China
- ICS
- 19.020
- Classification
- Q 81
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the evaluation method for the service life of hollow fiber membranes for water treatment.
This standard applies to the evaluation of the service life of hollow fiber ultrafiltration membranes and hollow fiber microfiltration membranes for water treatment.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 20103 Technical terms of membrane separation
3 Terms and definitions
The terms and definitions defined in GB/T 20103 and the following apply to this document. For ease of use, the following GB/T 20103 is repeatedly listed Terms and definitions.
3.1 Hollow fiber membrane
The appearance is a fibrous, hollow, self-supporting membrane.
Note: For reverse osmosis membrane, the cortex is on the outer surface; for ultrafiltration membrane and microfiltration membrane, the cortex is on the inner surface, outer surface or inner and outer surface. [GB/T 20103-2006, definition 2.1.28]
3.2 Microfiltration membrane
A separation membrane with a mean pore diameter of 0.01 µm or more. [GB/T 20103-2006, definition 5.1.2]
3.3 Ultrafiltration membrane
It consists of an extremely thin epidermal layer and a thicker sponge-like or finger-like porous layer that plays a supporting role. Hundreds to millions of membranes.
Note 1. The thickness of the epidermal layer is usually only 0.1 µm to 1 µm, and the thickness of the porous layer is usually 125 µm.
Note 2. Most ultrafiltration membranes are asymmetric membranes. [GB/T 20103-2006, definition 5.1.1]
3.4 Flux
The amount of permeated component per unit membrane area per unit time. [GB/T 20103-2006, definition 2.1.33]
3.5 Transmembrane pressure difference
The pressure difference between the water inlet side and the water production side of the membrane.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 20103-2006 — Technical terms for membrane separation
GB/T 6682-2008 — Water for analytical laboratory use - Specification and test methods
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