GBJ 109-1987 Design specification for industrial water softening and desalination
Some standard content:
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Design Specification for Softening and Desalination of Industrial Water
GBJ109-87
1988Beijing
Engineering Construction Standard Full-text Information System
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National Standard of the People's Republic of China
Design Specification for Softening and Desalination of Industrial Water
Editor Department: Ministry of Water Resources and Electric Power of the People's Republic of China Approval Department: State Planning Commission of the People's Republic of China Implementation Date: April 1, 1988||t t||Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Notice on the Release of "Design Specifications for Softening and Desalination of Industrial Water"
Standards [1987]]
No. 1244
According to the notice of the former State Construction Commission (81) Jianfashezi No. 546, the "Design Specifications for Softening and Desalination of Industrial Water" jointly formulated by the Ministry of Water Resources and Electric Power and relevant departments has been reviewed by relevant departments. The "Design Specifications for Softening and Desalination of Industrial Water" GBJ109-87 is now approved as a national standard and will be implemented from April 1, 1988. This standard is managed by the Ministry of Water Resources and Electric Power, and its specific interpretation work is the responsibility of the Northwest Electric Power Design Institute of the Ministry of Water Resources and Electric Power. The publication and distribution is organized by the Basic Construction Standards and Quotas Research Institute of our Commission.
National Planning Commission
July 25, 1987
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Preparation Instructions
This specification is compiled by the Northwest Electric Power Design Institute of our Ministry in accordance with the requirements of the notification of the former National Capital Construction Committee (81) Jianfashezi No. 546, and is compiled jointly with the design units of relevant departments.
In the process of compiling this specification, in accordance with the relevant policies and guidelines of my country's economic construction and in combination with the current technical and economic conditions in China, a relatively extensive investigation and research was carried out, and the practical experience of factories across the country was carefully summarized. The opinions of relevant design, construction, scientific research and colleges and universities across the country were solicited. Finally, our Ministry and relevant departments reviewed and finalized the draft. This specification is divided into six chapters and three appendices. Its main contents are: general provisions, water treatment stations, softening and desalination, post-treatment, drug storage and measurement, control and instrumentation, etc. In view of the fact that this specification is compiled for the first time, during the implementation process, all units are requested to combine engineering practice, carefully summarize experience, and pay attention to accumulating data. If any modification or supplement is found, please send your opinions and materials to the Northwest Electric Power Design Institute of the Ministry of Water Resources and Electric Power (Xi'an), and copy to the Electric Power Planning and Design Institute of the Ministry of Water Resources and Electric Power (Liupukeng, Beijing) for reference in future revisions.
Ministry of Water Resources and Electric Power
July 1987
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Chapter 1 General
Chapter 2
Water Treatment Station
Section 1
Section 2
Section 3
Chapter 3
General Provisions
Equipment Layout||tt| |Pipeline Layout
Softening and Desalination:
Section 1
Section 2
Section 3
Chapter 4
Chapter 5
General Provisions
System Selection·
Equipment Selection·
Post-processing
Drug Storage and Measurement
Section 2
Section 3
Section 4
Section 5
Chapter 6
General Provisions·
Flocculants
Control and Instrumentation
Conversion Table of Commonly Used Non-legal Units of Measurement and Legal Units of Measurement
Appendix 2 Ion Exchanger Design Data
Appendix 3 Explanation of Terms Used in This Code
Additional Notes
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(18)
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Chapter 1 General Provisions
Article 1.0.1 The design of industrial water softening and desalination must conscientiously implement the national technical and economic policies, combine the characteristics of the project, reasonably select water sources, save energy and water resources, protect the environment, improve working conditions, improve economic benefits, and facilitate installation, operation and maintenance, so as to achieve advanced technology, reasonable process, safety and applicability. Article 1.0.2 This specification applies to the design of new, expanded and rebuilt industrial water softening and desalination projects. wwW.bzxz.Net
Article 1.0.3 The equipment and plant of the industrial water softening and desalination system are built in stages or all at once, and should be comprehensively considered and determined based on the main project construction plan, production characteristics, raw water and water supply conditions (water supply, water pressure, water quality, etc.) and technical and economic comparison.
Article 1.0.4 The design of the expansion or reconstruction of the water treatment station should make full and reasonable use of the original buildings and water treatment facilities.
Article 1.0.5 The design of industrial water softening and desalination should be based on the continuous summary of production practice experience and scientific experiments, combined with the specific conditions of the project, and actively and prudently adopt new technologies, new materials and new equipment. Article 1.0.6 In the engineering design, in addition to implementing this specification, the provisions of the relevant national standards and specifications in force should also be implemented. Engineering Construction Standard Full Text Information System
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Chapter 2 Water Treatment Station
Section 1 General Provisions
Article 2.1.1 The general layout of the water treatment station in the factory area shall meet the following requirements:
1. Close to the main water users.
2. Convenient transportation.
3. It should be far away from places with dust such as coal yards and ash yards, and located on the upwind side of the structures that emit harmful gases, smoke and water mist all year round. Article 2.1.2 The water treatment station should be designed as an independent building. If the scale is not large, it can also be built together with other buildings. But it should not be built on the floor. Article 2.1.3 The water treatment station should be equipped with auxiliary rooms required for production management, instrument control, chemical analysis, equipment maintenance, drug storage and on-duty personnel. When there are central laboratories and maintenance workshops in the factory, the area of the auxiliary rooms should be reduced accordingly.
Section 2 Equipment Layout
Article 2.2.1 The equipment layout of the water treatment station shall comply with the following provisions: 1. Arrange in the order of process flow.
2. Save land and reduce noise interference to the main operation area. 3. Facilitate operation and maintenance.
Article 2.2.2 Clarifiers (devices), filter tanks (devices) and various water tanks can be arranged outdoors, and pedestrian passages should be set up on the top.
Article 2.2.3 When water treatment equipment is arranged outdoors, its operating parts and engineering 2 Construction Standard Full Text Information System
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instruments, sampling devices, valves, etc. should be arranged in a centralized manner, and measures should be taken to prevent rain, frost and sun.
Article 2.2.4 The net width of the main operation channel should not be less than 2m, and should meet the maintenance needs of the equipment. The net width of the patrol inspection channel should not be less than 0.8m. Article 2.2.5 Water treatment equipment and valves that are frequently inspected should be equipped with inspection ladders, platforms and lifting devices.
Article 2.2.6 Acid storage tanks should be arranged outdoors, and alkali storage tanks in cold areas can be arranged indoors. Acid and alkali storage tanks should be close to waste liquid neutralization tanks. Article 2.2.7 Air compressors and Roots blowers should be arranged in separate rooms, and noise reduction measures should be taken.
Article 2.2.8 The program control room and chemical precision instrument room should have good lighting and should be equipped with air conditioning devices.
Section 3 Pipeline Layout
Article 2.3.1 Pipeline layout should meet the following requirements: 1. Short pipelines, few accessories, neat and beautiful. 2. Easy to install, inspect and support.
3. It does not affect the lifting and handling of equipment. 4. It should not be arranged above the switchboard and control panel. Article 2.3.2 The slope of the gravity pipe of lime emulsion should not be less than 5%. The pipes should have fewer elbows, U-shaped pipes, etc. The elbows, tees and pipe sections through the wall should be flanged. When the horizontal straight pipe exceeds 3m, it should be connected in sections with flanges. Article 2.3.3 In places where people often pass, acid, alkali and concentrated ammonia pipelines should not be laid overhead. If they are laid overhead, protective measures must be taken. Engineering Construction Standards Full Text Information System
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Chapter 3 Softening and Desalination
Section 1 General Provisions
Article 3.1.Article 1 The design of industrial water softening and desalination shall obtain the water quantity and water quality analysis data of the local available water source, master its changing rules and various influences of the external environment on the water quantity and water quality of the water source, and select representative water quality analysis data as the design basis.
The number of copies of water quality analysis data collected throughout the year should meet the following requirements: 1. When the raw water is groundwater or seawater, one copy per quarter, a total of four copies per year. 2. When the raw water is surface water, one copy per month, a total of twelve copies per year. Article 3.1.2 The inlet water quality of the softening and desalination device shall meet the requirements of Table 3.1.2. Softening and desalination unit influent water quality requirements
Pollution index SDI
Turbidity FTU
Water temperature ℃
Overflow regeneration
Downstream regeneration
Chemical oxygen demand mg/L (potassium permanganate method, expressed as 02)
Ion exchange
Sulfonated coal
Free oxygen mg/L (expressed as C2=0.1~0.3Iron content mg/L (expressed as Fe)Daily
Poly content mg/yuan (expressed as Mn
Permeation
Rolled membrane
(cellulose acetate)
Hollow fiber membrane
(aromatic polyamide
Note: Chemical oxygen demand of ion exchange desalination unit influent water The oxygen content index refers to the requirements when using gel-type strong base anion resin. Article 3.1.3 The selection of softening and desalination systems should be determined based on the inlet water quality and the requirements for the outlet water quality, the outlet water volume, the supply of chemicals and ion exchangers, etc., after technical and economic comparison.
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Article 3.1.4 The outlet water volume of the softening and desalination system should be determined based on the water supply volume plus the system's own water consumption.
Article 3.1.5 The working exchange capacity of the ion exchange resin should be determined according to the resin performance curve or with reference to the operating experience under similar conditions. Article 3.1.6 The regenerated alkali solution of the strong base anion exchange resin used for silicon removal should be heated to 3540℃. ||tt| |Article 3.1.7 The selection of water treatment systems and equipment should reduce the discharge of waste acid, waste alkali, waste residue and other harmful substances, and treatment and disposal measures should be taken. Section 2 System Selection
Article 3.2.1 The softening system can be selected according to Table 3.2.1. Softening System Selection
System Name
And Code
Monosodium Lime
Cao-Na
Monosodium Na
Sodium Hydrogen Series
HD-Na
Sodium Chloride H
Parallel Na
Effluent Water
Total Hardness
Phosphate Hard Urea
(mg/L in
(mg/L in
《325|| tt||(mg yuan in
class water fan
carbonate hardness
total hardness
Note: ① When ion exchange resin is used as the exchanger, the value of strong acid anions in the inlet water is not limited. ② Symbols in the table: H-
Strong acid cation exchanger
Na——Sodium ion exchanger
Strong acid anions
(mg/L in
CaCO3)
Carbon dioxide remover
CaO——Lime treatment device
Article 3.2.2 When lime softening treatment is used, ferrous sulfate or other iron salts should be used as coagulants.
Article 3.2.3 When lime softening treatment is required and silicate removal is required, magnesium oxide or dolomite powder can be added. The raw water should be heated to 40±1℃. I Desalination
Article 3.2.4 Ion exchange desalination system can be selected according to Table 3.2.4. Engineering Construction Standard Full Text Information System
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System Name and Code
First Desalination
HD-OH
First Desalination with Mixed Bed
HD-OH-H/OH
Weak Acid First Desalination
Hw-HD-OH or
Weak Acid First Desalination with Mixed Bed
HHD-OH-H/OH or
-D-OH-H/OH
Weak Base First Desalination
HD-OHw-OH or
H-OHw-D-OH
Weak Base First Desalination with Mixed Bed
H-OHw-D-OH -H/OH
Weak acid, weak base primary desalination
Hw-HD-OH-OH
Weak acid, weak base primary desalination plus mixed bed
HW-HD-OHW-OH-H/OH
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Ion Exchange Desalination System Selection
Effluent Water Quality
Conductivity
(25℃)
(us/cm）
Downstream Regeneration
Convection Regeneration
(mg/L)
0.1~0.5<0.02
Downstream Regeneration
Convection Regeneration
0.1~0.5<0.0 2
Downstream regeneration
Convection regeneration
0.1~0.5<0.02
(mg/L)expressed by
）
Influent water quality
Carbonate hardness
(mg/Lexpressed by
CacO:）
Strong acid anions
(mg/Lexpressed by
CacO3）
Total salt content
(mg/L）
(mg/L)
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System name and code
Secondary desalination
HD-OH-H-OH
Two First-stage desalination plus mixed bed
HD-OH-H-OH-H/OH
Strong acid and weak base plus mixed bed
H-OHW-DH/OH
Secondary mixed bed
H/OH-Refined H/OH
Electrodialysis plus secondary mixed bed
ED-H/OH-Refined H/OH
Reverse osmosis (electrodialysis) plus first-stage desalination plus mixed bed combined treatment
or>HD-OH-H/OH
Effluent water quality
Conductivity
(25℃)
(us/cm）
(mg/L）
Note: Secondary mixed bed treatment is suitable for small-scale high-purity water treatment. <0.1
(mg/L)
expressed)
Water quality
Carbonate hardness
(mg/expressed as
CacOs)
Strong acid anions
(mg/expressed as
CaCO3)
Continued from the above table
Total salt content
(mg/L)
(mg/L)
100~150
②When there are special requirements for the indicators of organic matter, microorganisms, bacteria, particles, etc. in the effluent, the reverse osmosis plus desalination combined system can also be selected when the total salt content of the influent is <500mg/L.
Symbols in the table: H——strong acid cation exchanger; HW——weak acid cation exchanger; OH——strong base anion exchanger. Engineering Construction Standards Full Text Information System
.bzsoso:comArticle 3 The selection of softening and desalination system shall be determined by technical and economic comparison based on the requirements of inlet water quality and outlet water quality, outlet water volume, supply of chemicals and ion exchangers, etc.
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Article 3.1.4 The outlet water volume of softening and desalination system shall be determined based on the water supply volume plus the self-use water volume of the system.
Article 3.1.5 The working exchange capacity of ion exchange resin shall be determined according to the resin performance curve or by reference to the operating experience under similar conditions. Article 3.1.6 The regeneration alkali solution of the strong base anion exchange resin used for silicon removal should be heated to 3540℃.
Article 3.1.7 The selection of water treatment system and equipment shall reduce the discharge of waste acid, waste alkali, waste residue and other harmful substances, and treatment and disposal measures shall be taken. Section 2 System Selection
Article 3.2.1 The softening system can be selected according to Table 3.2.1. Softening system selection
System name
and code
monosodium lime
Cao-Na
monosodium Na
sodium hydrogen in series
HD-Na
sodium chloride H
parallel Na
outlet water
total hardness
phosphate hard urine
(mg/(mg/L
(mg/L
<325
(mg yuan||tt ||Class water fan
Carbonate hardness
Total hardness
Note: ①When ion exchange resin is used as the exchange agent, the value of strong acid anions in the inlet water is not limited. ②Symbols in the table: H-
Strong acid cation exchanger
Na——Sodium ion exchanger
Strong acid anions
(mg/L is expressed as
CaCO3)
Decarbonation device
CaO——Lime treatment device
Article 3.2.2 Lime During softening treatment, ferrous sulfate or other iron salts should be used as coagulants.
Article 3.2.3 When lime softening treatment is required to remove silicates, magnesium oxide or dolomite powder can be added. The raw water should be heated to 40±1℃. I Desalination
Article 3.2.4 The ion exchange desalination system can be selected according to Table 3.2.4. Engineering Construction Standard Full Text Information System
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System Name and Code
Grade Desalination
HD-OH||tt| |First-stage desalination plus mixed bed
HD-OH-H/OH
Weak acid first-stage desalination
Hw-HD-OH or
Weak acid first-stage desalination plus mixed bed
HHD-OH-H/OH or
-D-OH-H/OH
Weak base first-stage desalination
HD-OHw-OH or
H-OHw-D-OH
Weak base first-stage desalination plus mixed bed
H-OHw-D-OH-H/OH|| tt||Weak acid, weak base primary desalination
Hw-HD-OH-OH
Weak acid, weak base primary desalination plus mixed bed
HW-HD-OHW-OH-H/OH
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Ion Exchange Desalination System Selection
Effluent Water Quality
Conductivity
(25℃)
(us/cm）
Downstream Regeneration
Convection Regeneration
(mg/L )
0.1~0.5<0.02
Downstream regeneration
Convection regeneration
0.1~0.5<0.02
Downstream regeneration
Convection regeneration
0.1~0.5<0.02
(mg/L)expressed in
）
Influent water quality
Carbonate hardness
(mg/Lexpressed in
CacO:）
Strong acid anions
(mg/L is expressed as
CacO3)
Total salt content
(mg/L)
(mg/L)
Engineering Construction Standard Full Text Information System
System Name and Code
Secondary Desalination
HD-OH-H-OH
Secondary Desalination with Mixed Bed
HD-OH-H-OH-H/OH
Strong Acid and Weak Base with Mixed Bed
H-OHW-DH/OH||tt| |Secondary mixed bed
H/OH-Refined H/OH
Electrodialysis plus secondary mixed bed
ED-H/OH-Refined H/OH
Reverse osmosis (electrodialysis) plus primary desalination plus mixed bed combined treatment
or>HD-OH-H/OH
Effluent water quality
Conductivity
(25℃)
(us/cm）
(mg/L）
Note: Secondary mixed bed treatment is suitable for small-scale high-purity water treatment. <0.1
(mg/L)
expressed)
Water quality
Carbonate hardness
(mg/expressed as
CacOs)
Strong acid anions
(mg/expressed as
CaCO3)
Continued from the above table
Total salt content
(mg/L)
(mg/L)
100~150
②When there are special requirements for the indicators of organic matter, microorganisms, bacteria, particles, etc. in the effluent, the reverse osmosis plus desalination combined system can also be selected when the total salt content of the influent is <500mg/L.
Symbols in the table: H——strong acid cation exchanger; HW——weak acid cation exchanger; OH——strong base anion exchanger. Engineering Construction Standards Full Text Information System
.bzsoso:comArticle 3 The selection of softening and desalination system shall be determined by technical and economic comparison based on the requirements of inlet water quality and outlet water quality, outlet water volume, supply of chemicals and ion exchangers, etc.
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Article 3.1.4 The outlet water volume of softening and desalination system shall be determined based on the water supply volume plus the self-use water volume of the system.
Article 3.1.5 The working exchange capacity of ion exchange resin shall be determined according to the resin performance curve or by reference to the operating experience under similar conditions. Article 3.1.6 The regeneration alkali solution of the strong base anion exchange resin used for silicon removal should be heated to 3540℃.
Article 3.1.7 The selection of water treatment system and equipment shall reduce the discharge of waste acid, waste alkali, waste residue and other harmful substances, and treatment and disposal measures shall be taken. Section 2 System Selection
Article 3.2.1 The softening system can be selected according to Table 3.2.1. Softening system selection
System name
and code
monosodium lime
Cao-Na
monosodium Na
sodium hydrogen in series
HD-Na
sodium chloride H
parallel Na
outlet water
total hardness
phosphate hard urine
(mg/(mg/L
(mg/L
<325
(mg yuan||tt ||Class water fan
Carbonate hardness
Total hardness
Note: ①When ion exchange resin is used as the exchange agent, the value of strong acid anions in the inlet water is not limited. ②Symbols in the table: H-
Strong acid cation exchanger
Na——Sodium ion exchanger
Strong acid anions
(mg/L is expressed as
CaCO3)
Decarbonation device
CaO——Lime treatment device
Article 3.2.2 Lime During softening treatment, ferrous sulfate or other iron salts should be used as coagulants.
Article 3.2.3 When lime softening treatment is required to remove silicates, magnesium oxide or dolomite powder can be added. The raw water should be heated to 40±1℃. I Desalination
Article 3.2.4 The ion exchange desalination system can be selected according to Table 3.2.4. Engineering Construction Standard Full Text Information System
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System Name and Code
Grade Desalination
HD-OH||tt| |First-stage desalination plus mixed bed
HD-OH-H/OH
Weak acid first-stage desalination
Hw-HD-OH or
Weak acid first-stage desalination plus mixed bed
HHD-OH-H/OH or
-D-OH-H/OH
Weak base first-stage desalination
HD-OHw-OH or
H-OHw-D-OH
Weak base first-stage desalination plus mixed bed
H-OHw-D-OH-H/OH|| tt||Weak acid, weak base primary desalination
Hw-HD-OH-OH
Weak acid, weak base primary desalination plus mixed bed
HW-HD-OHW-OH-H/OH
Project 6 Construction Standard Full Text Information System
Ion Exchange Desalination System Selection
Effluent Water Quality
Conductivity
(25℃)
(us/cm）
Downstream Regeneration
Convection Regeneration
(mg/L )
0.1~0.5<0.02
Downstream regeneration
Convection regeneration
0.1~0.5<0.02
Downstream regeneration
Convection regeneration
0.1~0.5<0.02
(mg/L)expressed in
）
Influent water quality
Carbonate hardness
(mg/Lexpressed in
CacO:）
Strong acid anions
(mg/L is expressed as
CacO3)
Total salt content
(mg/L)
(mg/L)
Engineering Construction Standard Full Text Information System
System Name and Code
Secondary Desalination
HD-OH-H-OH
Secondary Desalination with Mixed Bed
HD-OH-H-OH-H/OH
Strong Acid and Weak Base with Mixed Bed
H-OHW-DH/OH||tt| |Secondary mixed bed
H/OH-Refined H/OH
Electrodialysis plus secondary mixed bed
ED-H/OH-Refined H/OH
Reverse osmosis (electrodialysis) plus primary desalination plus mixed bed combined treatment
or>HD-OH-H/OH
Effluent water quality
Conductivity
(25℃)
(us/cm）
(mg/L）
Note: Secondary mixed bed treatment is suitable for small-scale high-purity water treatment. <0.1
(mg/L)
expressed)
Water quality
Carbonate hardness
(mg/expressed as
CacOs)
Strong acid anions
(mg/expressed as
CaCO3)
Continued from the above table
Total salt content
(mg/L)
(mg/L)
100~150
②When there are special requirements for the indicators of organic matter, microorganisms, bacteria, particles, etc. in the effluent, the reverse osmosis plus desalination combined system can also be selected when the total salt content of the influent is <500mg/L.
Symbols in the table: H——strong acid cation exchanger; HW——weak acid cation exchanger; OH——strong base anion exchanger. Engineering Construction Standards Full Text Information System
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System Name and Code
First-stage desalination
HD-OH
First-stage desalination plus mixed bed
HD-OH-H/OH
Weak acid first-stage desalination
Hw-HD-OH or
Weak acid first-stage desalination plus mixed bed
HHD-OH-H/OH or
-D-OH-H/OH
Weak base first-stage desalination
HD-OHw-OH or
H-OHw-D-OH
Weak base first-stage desalination plus mixed bed
H-OHw-D-OH -H/OH
Weak acid, weak base primary desalination
Hw-HD-OH-OH
Weak acid, weak base primary desalination plus mixed bed
HW-HD-OHW-OH-H/OH
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Ion Exchange Desalination System Selection
Effluent Water Quality
Conductivity
(25℃)
(us/cm）
Downstream Regeneration
Convection Regeneration
(mg/L)
0.1~0.5<0.02
Downstream Regeneration
Convection Regeneration
0.1~0.5<0.0 2
Downstream regeneration
Convection regeneration
0.1~0.5<0.02
(mg/L)expressed by
）
Influent water quality
Carbonate hardness
(mg/Lexpressed by
CacO:）
Strong acid anions
(mg/Lexpressed by
CacO3）
Total salt content
(mg/L）
(mg/L)
Engineering construction standard full text information system
System name and code
Secondary desalination
HD-OH-H-OH
Two First-stage desalination plus mixed bed
HD-OH-H-OH-H/OH
Strong acid and weak base plus mixed bed
H-OHW-DH/OH
Secondary mixed bed
H/OH-Refined H/OH
Electrodialysis plus secondary mixed bed
ED-H/OH-Refined H/OH
Reverse osmosis (electrodialysis) plus first-stage desalination plus mixed bed combined treatment
or>HD-OH-H/OH
Effluent water quality
Conductivity
(25℃)
(us/cm）
(mg/L）
Note: Secondary mixed bed treatment is suitable for small-scale high-purity water treatment. <0.1
(mg/L)
expressed)
Water quality
Carbonate hardness
(mg/expressed as
CacOs)
Strong acid anions
(mg/expressed as
CaCO3)
Continued from the above table
Total salt content
(mg/L)
(mg/L)
100~150
②When there are special requirements for the indicators of organic matter, microorganisms, bacteria, particles, etc. in the effluent, the reverse osmosis plus desalination combined system can also be selected when the total salt content of the influent is <500mg/L.
Symbols in the table: H——strong acid cation exchanger; HW——weak acid cation exchanger; OH——strong base anion exchanger. Engineering Construction Standards Full Text Information System
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System Name and Code
First-stage desalination
HD-OH
First-stage desalination plus mixed bed
HD-OH-H/OH
Weak acid first-stage desalination
Hw-HD-OH or
Weak acid first-stage desalination plus mixed bed
HHD-OH-H/OH or
-D-OH-H/OH
Weak base first-stage desalination
HD-OHw-OH or
H-OHw-D-OH
Weak base first-stage desalination plus mixed bed
H-OHw-D-OH -H/OH
Weak acid, weak base primary desalination
Hw-HD-OH-OH
Weak acid, weak base primary desalination plus mixed bed
HW-HD-OHW-OH-H/OH
Project 6 Construction Standard Full Text Information System
Ion Exchange Desalination System Selection
Effluent Water Quality
Conductivity
(25℃)
(us/cm）
Downstream Regeneration
Convection Regeneration
(mg/L)
0.1~0.5<0.02
Downstream Regeneration
Convection Regeneration
0.1~0.5<0.0 2
Downstream regeneration
Convection regeneration
0.1~0.5<0.02
(mg/L)expressed by
）
Influent water quality
Carbonate hardness
(mg/Lexpressed by
CacO:）
Strong acid anions
(mg/Lexpressed by
CacO3）
Total salt content
(mg/L）
(mg/L)
Engineering construction standard full text information system
System name and code
Secondary desalination
HD-OH-H-OH
Two First-stage desalination plus mixed bed
HD-OH-H-OH-H/OH
Strong acid and weak base plus mixed bed
H-OHW-DH/OH
Secondary mixed bed
H/OH-Refined H/OH
Electrodialysis plus secondary mixed bed
ED-H/OH-Refined H/OH
Reverse osmosis (electrodialysis) plus first-stage desalination plus mixed bed combined treatment
or>HD-OH-H/OH
Effluent water quality
Conductivity
(25℃)
(us/cm）
(mg/L）
Note: Secondary mixed bed treatment is suitable for small-scale high-purity water treatment. <0.1
(mg/L)
expressed)
Water quality
Carbonate hardness
(mg/expressed as
CacOs)
Strong acid anions
(mg/expressed as
CaCO3)
Continued from the above table
Total salt content
(mg/L)
(mg/L)
100~150
②When there are special requirements for the indicators of organic matter, microorganisms, bacteria, particles, etc. in the effluent, the reverse osmosis plus desalination combined system can also be selected when the total salt content of the influent is <500mg/L.
Symbols in the table: H——strong acid cation exchanger; HW——weak acid cation exchanger; OH——strong base anion exchanger. Engineering Construction Standards Full Text Information System
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