GB/T 39221-2020 in English

VALID

Determination for performance of scale inhibitors for reverse osmosis seawater desalination—Recurrent condensation cycle test method

Issued on:2020-10-11
Implemented on:2021-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $220.00
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Standard No:	GB/T 39221-2020
Document status:	VALID
Title in English:	Determination for performance of scale inhibitors for reverse osmosis seawater desalination—Recurrent condensation cycle test method
Title in Chinese:	反渗透海水淡化阻垢剂阻垢性能试验周期浓缩循环法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-10-11
Implemented on:	2021-05-01
ICS Classification:	07.060-Geology. Meteorology. Hydrology
Professional Classification:	GB-National Standard
Related Topics:	desalination dilute seawater water antiscalant Inhibitor Antiscalant Screening Celsius scale Antiscalant Screening Determination of scale inhibition performance of antiscalants for desalination membranes Artificial concentrated seawater calcium carbonate deposition method Antiscalant System Inhibitor test Antiscalant System Inhibitor + test How to use antiscalant Seawater Antiscalant Requirements Scale inhibition performance of antiscalant for seawater desalination membrane reverse osmosis cleaning Antiscalant Performance of Membrane Antiscalants Reverse Osmosis System Cleaning Reverse Osmosis System Cleaning Tour de France Seawater desalination antiscalant seawater antiscalant seawater antiscalant Antiscalant performance Antiscalant performance Excellent descaling performance System antiscalant Concentration Antiscalant performance Membrane antiscalant performance antiscalant current Reverse osmosis membrane seawater desalination antiscalant seawater desalination antiscalant seawater Antiscalant performance water down performance Scale inhibition Descaling Antiscalants Limescale Seawater desalination antiscalant Antiscalant Performance of Antiscalants Seawater desalination performance Anti-scaling instrument Reverse osmosis membrane seawater desalination reverse osmosis sea water reverse osmosis sea water reverse osmosis sea water What is the scale? Seawater desalination reverse osmosis membrane method Concentration Seawater desalination antiscaling "Desalination How long is the scale cyclic transmission Decontamination agent seawater preconcentration Antiscalant Test Reverse osmosis membrane seawater desalination method GBT39221 GB/T 39221-2020 Water side fouling thermal resistance roof penetration resistance Phosphorus-free scale inhibitor Experimental determination method for antiscalants Antiscalant chemical industry Reverse osmosis is performed with antiscalants Anti/antiscalant quality Hot water scale inhibition test Desalination standards Reverse osmosis antiscalant industry Antiscaling performance test How to destroy antiscalants Reverse osmosis antiscalant implementation Reverse osmosis performance test

《GB/T 39221-2020反渗透海水淡化阻垢剂阻垢性能试验周期浓缩循环法》由TC442（全国节水标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

Technical background of the standard

With the widespread application of seawater desalination technology in coastal areas of my country, the scaling problem of reverse osmosis membrane has become a key factor restricting the operating efficiency of the system. The formulation of GB/T 39221-2020 fills the gap in the dynamic performance evaluation method of scale inhibitors. Compared with traditional static tests (such as GB/T 23248), this standard simulates the actual working conditions more realistically through the periodic concentration circulation method.

Core test principle

The standard adopts the accelerated scaling mechanism: adjust the seawater pH to 9.0-10.0 by NaOH, and perform circulation-concentration alternating operation at 30±1℃. The key parameter control includes:

Parameter	Requirement	Monitoring method
Concentration gradient	ΔK≤0.5	Chloride ion concentration ratio
Recovery rate	15-25%	Real-time monitoring of flow meter
Temperature fluctuation	±1℃	PT100 temperature sensor

Key device configuration

Take the test device of Qingdao Baifa Seawater Desalination Plant as an example:

High-pressure system: plunger pump (pressure ≥8.0MPa) with S31603 stainless steel pipe
Monitoring system: conductivity meter (accuracy ±0.01mS/cm) + pH online sensor
Control unit: PLC system realizes triple protection of low pressure/high pressure/high temperature

Test data processing methodology

Calculate the concentration multiple by formula:

K_Cl = C_Cl,i/C_Cl,0 (chloride ion)
K_Ca = C_Ca,i/C_Ca,0 (calcium ion)

When the deviation between the two curves is greater than 15%, it is determined to be the scaling critical point, and the quality of the scale inhibition performance is reflected by the difference in the critical cycle number.

Implementation suggestions

The SDI₁₅ of pretreated seawater must be controlled at <5
The membrane must be cleaned according to GB/T 23954 after each test cycle
It is recommended to use the orthogonal test method to optimize the dosage concentration of the scale inhibitor

More samples: JJG 21-2008 YD/T 3934-2021 DL/T 5154-2012

Sample only — not a preview of GB/T 39221-2020