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GB/T 39808-2021: Design specification for external membrane filtration system of drinking water
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Design specification for external membrane filtration system of drinking water
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GB/T 39808-2021
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Basic data | Standard ID | GB/T 39808-2021 (GB/T39808-2021) | | Description (Translated English) | Design specification for external membrane filtration system of drinking water | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | P41 | | Word Count Estimation | 14,151 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39808-2021: Design specification for external membrane filtration system of drinking water---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Design specification for external membrane filtration system of drinking water
ICS 13.060.20
P41
National Standards of People's Republic of China
Design specification for external membrane filtration system for drinking water
Released on 2021-03-09
2021-10-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 General 2
5 Design requirements 3
5.1 Design process 3
5.2 Designed water production and design water quality 3
5.3 Design throughput 4
5.4 Pretreatment unit 4
5.5 Water inlet unit 5
5.6 Filter unit 5
5.7 Water production unit 6
5.8 Cleaning unit 6
5.9 Compressed air unit 7
5.10 Post-processing unit 7
5.11 Detection and control unit 7
Reference 8
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed and managed by the National Separation Membrane Standardization Technical Committee (SAC/TC382).
Drafting organizations of this standard. Tianjin Motian Membrane Technology Co., Ltd., Sanda Membrane Technology (Xiamen) Co., Ltd., Beijing Bishuiyuan Membrane Technology
Co., Ltd., Guangzhou Institute of Advanced Technology, Chinese Academy of Sciences, Huazhong University of Science and Technology, Jiangsu Jiuwu High-Tech Co., Ltd., Hangzhou Anuo
Filter Equipment Co., Ltd., Jilin City Jinsai Technology Development Co., Ltd., Beijing Ketai Xingda High-tech Co., Ltd., Bluestar (Beijing) Chemical Machinery
Machinery Co., Ltd., Zhejiang Water Art Environmental Technology Co., Ltd., Hangzhou Smart Water Treatment Engineering Co., Ltd., Tianjin Polytechnic University, Harbin Industry
University, Zhejiang Kaichuang Environmental Technology Co., Ltd., Shandong Zhaojin Motian Co., Ltd., Zhejiang Jinmo Environmental Technology Co., Ltd., Tianjin
Motianmo Engineering Technology Co., Ltd.
The main drafters of this standard. Li Xiangde, Wu Ruijun, Xie Pengwei, Lin Lihua, Zhang Ying, Wang Xi, Wang Songlin, Peng Wenbo, Zhang Junwei, Jin Shujie,
Han Ailong, Liu Xiuming, Zhao Fei, Zhang Lifeng, Wang Jie, Liang Heng, Bao Jinfeng, Wang Leyi, Xu Yinong, Feng Lei, Liu Yang, Xi Xuejie.
Design specification for external membrane filtration system for drinking water
1 Scope
This standard specifies the design process of an external membrane filtration system for drinking water, the design of water production, water quality, and flux, as well as pretreatment,
Design requirements for water inlet, filtration, water production, cleaning, compressed air, post-processing, detection and control units.
This standard applies to the design, operation and management of external membrane filtration systems for drinking water.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB 5749 Sanitary Standard for Drinking Water
GB/T 17218 Hygienic Safety Evaluation of Drinking Water Chemical Treatment Agent
GB/T 17219 Safety evaluation standard for drinking water delivery and distribution equipment and protective materials
GB 50013-2018 Outdoor Water Supply Design Standard
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Membrane module
It is a practical device composed of membrane element, shell, inner connecting piece, end plate and sealing ring.
Note. The shell of the membrane module can contain one or several membrane elements.
[GB/T 20103-2006, definition 2.2.3]
3.2
Transmembrane pressure; TMP
The difference between the average inlet and outlet pressure on the raw water side and the pressure on the produced water side is the average pressure difference on both sides of the membrane.
[GB/T 31327-2014, definition 3.5]
3.3
Membrane moduleset
The pressure membrane treatment process system consists of membrane modules, brackets, water collection and distribution pipes, air distribution pipes and various valves that can be operated independently
Filter unit.
[CJJ/T 251-2017, definition 2.0.8]
3.4
External membrane filtration system
The membrane group is placed outside the water to be treated (different from the membrane group immersed in the water to be treated), and is different from the pretreatment unit, water inlet unit, water production unit, and cleaning unit.
Composed of air element, compressed air unit, post-processing unit, detection and control unit, etc., the influent water enters the membrane module after being pressurized to achieve the transmembrane pressure difference.
The membrane system that promotes water filtration.
3.5
Flux
The amount of permeable component per unit time per unit membrane area.
[GB/T 20103-2006, definition 2.1.33]
3.5.1
Design flux normalflux
The membrane flux when all membrane groups (membrane pools) in the system are in the filtering state under the design water temperature condition.
[CJJ/T 251-2017, definition 2.0.13]
3.5.2
Critical flux thresholdflux
Due to the increasing pollution of the membrane during operation, when the constant flux is running, the transmembrane pressure difference deviates from the original trend and rises sharply.
Or when the membrane flux is running at a constant transmembrane pressure difference, the membrane flux deviates from the original trend and drops dramatically.
3.6
Physicalcleaning
The process of using mechanical methods to remove contaminants on the membrane surface.
[GB/T 20103-2006, definition 7.2.7]
3.7
Chemical cleaning
The process of using chemicals to remove contaminants from the membrane.
[GB/T 20103-2006, definition 7.2.8]
3.8
Maintenancecleaning
In order to slow down membrane fouling, low-concentration chemicals are used to clean the membrane modules.
[GB/T 33898-2017, definition 3.10]
3.9
Restorativecleaning
In order to restore the membrane performance, a higher concentration of chemicals is used to clean the membrane module.
[GB/T 33898-2017, definition 3.11]
4 General
4.1 The design of the drinking water membrane filtration system should comply with energy saving and consumption reduction, improve the comprehensive utilization of resources, and ensure the safety of drinking water
The regulations of current national standards.
4.2 Before design, conduct a comprehensive survey and comprehensive investigation and analysis of the topography, geology, meteorology, environment, and water demand of the site, and unify
Consider the overall layout to ensure uniform water distribution, which is convenient for construction, maintenance and management.
4.3 When the following situations occur in the drinking water plant, the membrane filtration treatment process should be adopted.
a) Water production and water quality need to be improved;
b) Product water turbidity, particle number, microorganisms, total salt content, heavy metals and other indicators are required to be high, and traditional water purification processes are risky;
c) The raw water quality fluctuates greatly or there is a small land occupation requirement.
4.4 When the turbidity, number of particles, microorganisms and other indicators of the drinking water produced are required to be high, the membrane filtration treatment should adopt the ultra-microfiltration membrane;
When the salt content, heavy metals, chlorinated hydrocarbon derivatives, pesticide residues and other indicators are required to be high, the membrane filtration treatment should use ultra-microfiltration membranes and nanofiltration membranes
Or reverse osmosis membrane combination process.
4.5 The chemicals used in the membrane filtration system should meet the sanitary requirements of drinking water wading products, and should meet the requirements of GB/T 17218.
5.5 Water inlet unit
5.5.1 The inlet water of the membrane filtration system can be pressure-lifted inlet or gravity flow inlet. If gravity flow is adopted, overflow facilities should be provided.
5.5.2 The inlet pump of the water inlet unit of the membrane filtration system should be controlled by variable frequency speed regulation, and its rated flow should not be less than the required maximum flow, or
Take 1.1 times to 1.3 times of the normal running product water flow, and the inlet pump should be equipped with a backup pump system.
5.5.3 The water intake of the membrane filtration system should be adjusted by automatic gates or automatic valves, and distributed evenly to each membrane group.
5.6 Filter unit
5.6.1 General provisions
5.6.1.1 The water collection pipeline, frame and accessory parts of the filter unit of the membrane filtration system should be reasonably arranged, easy to install and repair, and meet the requirements of the process.
And safety requirements.
5.6.1.2 The design and selection of the filter unit of the membrane filtration system shall fully consider the compact structure, energy saving and consumption reduction.
5.6.1.3 The connection between the filter unit and the pipeline of the membrane filtration system shall be fixed by a connecting piece with reliable connection, good sealing, pressure resistance, and convenient installation and disassembly.
5.6.1.4 The chemical properties of pipes, equipment, mechanical parts and protective materials in contact with water should be stable and resistant to pollution, and should comply with GB/T 17219
Regulations.
5.6.2 Calculation of the number of membrane modules
The number of membrane modules in the membrane filtration system N is estimated according to formula (1).
N=
1000×24×Q
F×S×T×P
(1)
Where.
N --- the number of system membrane components, the unit is branch;
1000---Cubic meter and liter unit conversion, that is, 1000L/m3;
24 ---The unit conversion between days and hours, that is, 24h/d;
Q --- Designed water flow rate, in cubic meters per hour (m3/h);
F --- design flux, the unit is liters per square meter hour [L/(m2·h)];
S ---The effective membrane area of a single membrane module, in square meters per piece (m2/piece);
T --- Effective water production time per day, in hours per day (h/d);
P ---System design water recovery rate, %.
The calculated data result is rounded to the nearest whole number.
5.6.3 Membrane group selection
5.6.3.1 The membrane group of the external membrane filtration system for drinking water shall be determined according to the project site conditions, equipment maintenance, cleaning and other factors.
5.6.3.2 The number U of system membrane groups is calculated according to formula (2).
U=
(2)
Where.
U --- the number of system membrane groups, the unit is Taiwan (set);
N---the number of system membrane components, the unit is branch;
n ---The number of membrane modules in a single (set) membrane group, in units.
5.6.3.3 According to the number U of system membrane groups calculated in 5.6.3.2, the system membrane group configuration shall be determined according to the following rules.
a) If the calculated number of membrane groups is an integer, it can be directly selected from the membrane supplier's membrane group configuration table;
b) If the calculated number of membrane modules is not an integer, and the remainder is not more than 5% of the total number of membrane modules, the design flux of membrane modules should be increased.
Decrease the number of membrane modules to determine the configuration of the membrane group; when the remainder is greater than 5% of the total number of membrane modules, the membrane group configuration should be re-selected.
5.7 Water production unit
5.7.1 Membrane water production can adopt gravity spontaneous water production or pressure water production.
5.7.2 The production water pipelines and valves should ensure the reliability of the sealing of the connection, and meet the requirements of pressure and chemical corrosion resistance during use.
5.8 Cleaning unit
5.8.1 Physical cleaning unit
5.8.1.1 The physical cleaning unit is generally composed of cleaning water pumps, blowers or air compressors, pipes and valves.
5.8.1.2 Physical cleaning usually includes one or several cleaning processes of air flushing, water flushing, water backwashing, and air-water backwashing.
5.8.1.3 Physical cleaning is usually carried out automatically and regularly according to a preset program. The cleaning duration and cycle are automatically controlled by the preset parameters.
Adjust at any time according to operating conditions and water quality conditions.
5.8.1.4 The water used for physical cleaning shall adopt membrane filtration water or higher quality water.
5.8.1.5 When the membrane production tank cannot directly supply water to the cleaning water pump, a separate cleaning water tank should be provided.
5.8.1.6 The cleaning water tank should be made of polyethylene (PE) or glass fiber reinforced plastic (FRP), and the volume of the water tank should not be less than that of a single (set) membrane group.
The amount of water required.
5.8.1.7 The cleaning flow rate and cleaning frequency should be determined comprehensively according to the recommended values of membrane products, combined with actual operating conditions and water quality conditions.
5.8.1.8 The water backwash flow rate can usually be designed at 1 to 3 times the production water flow rate, the backwash pressure should not be greater than 0.20MPa, and the backwash cycle should not be
Less than 20min, the backwash duration should be 30s~90s.
5.8.2 Chemical cleaning unit
5.8.2.1 The chemical cleaning unit generally consists of chemical storage, preparation, heating, dosing, circulation facilities and supporting chemical pumps, agitators, pipelines and
Valves and other components.
5.8.2.2 Chemical cleaning usually includes maintenance cleaning with low chemical concentration and restorative cleaning with high chemical concentration.
5.8.2.3 Maintenance cleaning is usually carried out automatically and regularly according to a preset program. The cleaning agent dosage concentration, flow, temperature, and cycle times
Automatic control preset parameters such as immersion time and soaking time should be adjusted at any time according to operating conditions and water quality conditions, and restorative cleaning is usually when needed.
get on.
5.8.2.4 The chemical cleaning solution should be prepared with membrane-filtered water or better quality water.
5.8.2.5 The chemical cleaning water tank should be made of polyethylene (PE) or glass fiber reinforced plastic (FRP), and be equipped with a heater and a thermometer.
5.8.2.6 The cleaning temperature should be within the temperature control range specified by the membrane module manufacturer, and should be controlled between 20°C and 35°C.
5.8.2.7 The return pipeline and valve from the outlet of the chemical cleaning pump to the cleaning water tank should be set up to mix the chemical agent and the clean water evenly.
5.8.2.8 The equipment, pipelines and valves in direct contact with the agent shall meet the requirements of anti-chemical corrosion.
5.8.2.9 The selection, dosage and cleaning plan of chemical cleaning agents should be based on the specific pollution situation and the recommendations of the membrane supplier or similar projects.
Operating experience is determined through experiments.
5.8.2.10 A one-way valve for adding chemicals to the pipeline should be set, and automatic isolation safety facilities should be set to prevent chemical cleaning chemicals from entering the water production side.
5.8.2.11 After the chemical cleaning is completed, the cleaning fluid should be drained, and the membrane filtered water or better water should be used for thorough cleaning.
5.8.2.12 The dosing pump should be equipped with a standby pump system.
5.8.2.13 The dosing tank should be made of polyethylene (PE) or glass fiber reinforced plastic (FRP), and be equipped with a magnetic flap level gauge or a low level indicator, such as
The agent is a kind of solid powder and should be equipped with a dissolving and stirring device.
5.8.2.14 A separate chemical agent room should be set up, and the agents in the agent room should be stored separately, and protection and ventilation equipment should be provided.
5.9 Compressed air unit
5.9.1 The compressed air unit is set up and designed according to the requirements of membrane technology, and is generally composed of air compressors, air storage tanks, pipelines, valves and filtration, dehumidification, and dehumidification.
It is composed of auxiliary equipment such as oil and cold drying.
5.9.2 The compressed air unit shall provide the gas flow and gas flow rate for the physical cleaning of the membrane module, the actuation of the pneumatic valve and the completion of the system integrity test.
pressure.
5.9.3 The air compressor should be an oil-free screw air compressor or an air compressor with a degreasing device.
5.9.4 When the system adopts pneumatic automatic valves, the compressed air driving the automatic valves should be equipped with a voltage stabilizing system.
5.9.5 Pressure alarm and linked automatic pressure relief measures should be set when the air pressure exceeds the maximum working pressure of the membrane.
5.10 Post-processing unit
5.10.1 Drinking water should be disinfected and should comply with the relevant regulations in GB 5749 and GB 50013-2018 in 9.9.
5.10.2 The physical cleaning wastewater should be collected in the wastewater tank, and reused or discharged after treatment; the chemical cleaning wastewater and the physical cleaning after the chemical cleaning
The cleaning waste liquid should be collected in a chemical treatment tank, and discharged after the treatment reaches the standard, or the waste liquid should be transported for centralized treatment, and should not be reused.
5.10.3 The waste water tank and chemical treatment tank should be close to the membrane filtration facility, and the effective volume of the waste water tank should not be less than the maximum value during physical cleaning of the membrane filtration system.
1.5 times the maximum primary drainage volume, and the effective volume of the chemical treatment tank should not be less than 2 times the maximum waste liquid volume of a chemical cleaning of the membrane filtration system.
And should be divided into two independent grids.
5.10.4 The chemical treatment pool should be covered with a ventilation device, and the inner wall should be treated with anti-corrosion treatment. Protective equipment and flushing and eyewashing should be installed on the side of the pool.
facility.
5.11 Detection and control unit
5.11.1 The external membrane filtration system for drinking water should be equipped with an independent process monitoring and control unit.
5.11.2 The design of the detection and control unit of the membrane filtration system should be determined according to the process form and operation management requirements.
5.11.3 The control system should adopt a programmable controller (PLC) to automatically control the operation, and it should be equipped with a man-machine interface for manual operation. Key parameters
It can be adjusted through the man-machine interface.
5.11.4 The main monitoring items are as follows.
a) The inlet water pressure, inlet water flow, transmembrane pressure difference, turbidity of the product water, and the product water flow of each membrane group (set);
b) The total influent turbidity and water temperature of the membrane filtration system, the turbidity of the total product water, and the total product water flow;
c) Pressure and flow of cleaning gas and water;
d) The liquid level, concentration and temperature of the dosing tank;
e) Liquid level, pH, etc. of chemical treatment tank.
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