GB/T 18921-2019 English PDF (GB/T18921-2019)

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GB/T 18921-2019: The reuse of urban recycling water - Water quality standard for scenic environment use
GB/T 18921-2019
The reuse of urban recycling water--Water quality standard for scenic environment use
ICS 13.060
P40
National Standards of People's Republic of China
Replace GB/T 18921-2002
Urban sewage recycling water quality of landscape environment
Published on.2019-06-04
2020-05-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 18921-2002 "Urban Sewage Recycling Landscape Water Quality", and GB/T 18921-2002
In contrast to the editorial changes, the main technical changes are as follows.
--- Increased water use in landscape wetlands (see 3.5);
--- Removed four indicators of suspended solids, dissolved oxygen, petroleum, anionic surfactants and selected control projects (see.2002 edition)
4.1 and 4.2);
--- Revised some water quality indicators, including BOD5, turbidity, total phosphorus, total nitrogen, ammonia nitrogen, fecal coliform, residual chlorine, color (see Chapter 4,
Version 4.1 of the.2002 edition;
--- Revised the hydraulic retention time of landscape lake water bodies, deleted the hydraulic retention time and water exchange mode of landscape river water bodies, and increased
Added provisions for the setting of markings in landscape water bodies (see 5.2 and 6.1,.2002 editions 5.2, 5.3 and 5.5);
--- Revised water sampling requirements and tracking monitoring content, and revised some water quality indicators monitoring frequency and monitoring analysis methods (see 7.1,
7.2, 7.3 and 7.4, 7.1, 7.2, 7.3 and 7.4) of the.2002 edition;
--- Removed "Standard Implementation and Supervision" (see Chapter 8 of the.2002 edition).
This standard was proposed by the Ministry of Housing and Urban-Rural Development of the People's Republic
This standard is under the jurisdiction of the National Urban Water Supply and Drainage Standardization Technical Committee (SAC/TC434).
This standard was drafted. China Municipal Engineering North China Design and Research Institute Co., Ltd., Tianjin Venture Environmental Group Co., Ltd., North
Jingcheng Drainage Group Co., Ltd., Beijing Enterprises Water Group Co., Ltd., National Urban Water Supply and Drainage Engineering Technology Research Center, China Branch
College Ecological Environment Research Center, Jiangnan University.
The main drafters of this standard. Zheng Xingcan, Guo Xingfang, Chen Li, Jiang Wei, Li Kuixiao, Li Xinyu, Sun Yongli, Zhang Wei, Li Ji, Shen Shifeng.
The previous versions of the standards replaced by this standard are.
---GB/T 18921-2002.
Urban sewage recycling water quality of landscape environment
1 Scope
This standard specifies the water quality indicators, utilization requirements, safety requirements, sampling and monitoring of urban sewage reuse and landscape environment water use.
This standard applies to reclaimed water used in landscape environments.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6920 Determination of water pH value - Glass electrode method
GB/T 11893 Determination of total phosphorus in water - Ammonium molybdate spectrophotometric method
GB/T 11903 Determination of water color chromaticity
GB/T 13200 Determination of turbidity of water
GB 18918 Pollutant discharge standard for urban sewage treatment plants
GB/T 25499-2010 Urban sewage recycling green space irrigation water quality
HJ/T 347 Determination of water-based fecal coliforms - Multi-tube fermentation method and membrane method (Trial)
HJ493 Technical Regulations for Preservation and Management of Water Quality Samples
HJ505 Water quality five-day biochemical oxygen demand (BOD5) determination dilution and inoculation method
HJ535 Water quality - Determination of ammonia nitrogen - Nyna reagent spectrophotometric method
HJ537 Determination of Ammonia Nitrogen in Water - Distillation - Neutralization Titration
Water quality -- Determination of free chlorine and total chlorine - N,N-diethyl- 1,4- phenyldiamine spectrophotometric method
HJ636 Determination of total nitrogen in water - Alkaline potassium persulfate digestion - UV spectrophotometric method
3 Terms and definitions
The following terms and definitions as defined in GB/T 25499-2010 apply to this document and are listed below for ease of use.
Some terms and definitions in GB/T 25499-2010.
3.1
Reclaimed water reclaimedwater
After the urban sewage is treated by appropriate regeneration process, it can meet certain water quality requirements and meet certain functional requirements.
Water.
[GB/T 25499-2010, definition 3.1]
3.2
Landscape environment water recyclingwaterforscenicenvironmentuse
Water that meets the needs of the landscape environment, that is, water used to create and maintain landscape water bodies, wetland environments, and various waterscape structures
General name.
3.3
Ornamental landscape environment water aestheticenvironmentuse
Water for landscape environment that is not directly contacted by the human body, including landscape rivers and landscapes without entertainment facilities
Water for lakes and other ornamental landscapes.
Note. All or part of the composition consists of reclaimed water.
3.4
Recreational landscape environment with water conservationalenvironmentuse
Water for landscape environment with non-systematic contact with the main function of entertainment, including landscape rivers and scenery with entertainment facilities
View lakes and other recreational landscapes.
Note. All or part of the composition consists of reclaimed water.
3.5
Landscape wetland environment water aestheticwetlandenvironmentuse
Environmental water for wetlands built or restored to create urban landscapes.
Note. All or part of the composition consists of reclaimed water.
3.6
River water body watercourse
Landscape rivers are continuous flowing water bodies.
3.7
Lake water body impoundment
Landscape lakes are non-continuous flowing water bodies.
3.8
Waterscape waterscape
Water for water features such as man-made waterfalls and fountains.
3.9
Hydraulic retention time hydraulicretentiontime
The average residence time (slow or discontinuous flow) or average water exchange period (no flow effluent) of reclaimed water in lake waters.
4 Water quality indicators
As the reclaimed water for landscape environment water, the water quality shall comply with the provisions of Table 1 and shall also comply with the provisions of GB 18918.
Table 1 Reclaimed water quality of landscape environment water
Serial number item
Ornamental landscape environment water recreational landscape environment water
Rivers, lakes, water features, rivers, lakes, water features
Landscape wetland
Environmental water
1 Basic requirements are no floating things, no unpleasant smell and smell
2 pH (dimensionless) 6.0~9.0
3 5th day biochemical oxygen demand (BOD5)/(mg/L) ≤ 10 ≤ 6 ≤ 10 ≤ 6 ≤ 10
4 turbidity/NTU ≤ 10 ≤ 5 ≤ 10 ≤ 5 ≤ 10
5 Total phosphorus (in P)/(mg/L) ≤ 0.5 ≤ 0.3 ≤ 0.5 ≤ 0.3 ≤ 0.5
6 total nitrogen (in N)/(mg/L) ≤ 15 ≤ 10 ≤ 15 ≤ 10 ≤ 15
7 Ammonia nitrogen (in N)/(mg/L) ≤ 5 ≤ 3 ≤ 5 ≤ 3 ≤ 5
8 fecal coliforms/(number/L) ≤ 1000 ≤ 1000 ≤ 3 ≤ 1000
9 residual chlorine/(mg/L) - 0.05 ~ 0.1 -
10 chromaticity/degree ≤ 20
Note 1. Reclaimed water without chlorination is not used, and there is no residual chlorine requirement at the water replenishment point.
Note 2. “-” indicates no requirement for this item.
5 Utilization requirements
5.1 The water source of the reclaimed water plant should use domestic sewage or urban sewage that does not contain heavy polluted or toxic and hazardous industrial wastewater.
5.2 When using reclaimed water completely, when the water temperature is greater than 25 °C, the hydraulic retention time of the landscape lake water body should not be greater than 10d; the water body temperature
When the actual total phosphorus concentration is less than 25 ° C or the reclaimed water is lower than the limit of Table 1, the hydraulic retention time of the water body may be prolonged.
5.3 Set up artificial aeration or hydraulic propulsion and other devices to enhance water body disturbance and flow capacity, or large water surface due to natural effects such as wind power
When strong flow and exchange capacity, combined with operational process monitoring, the hydraulic retention time of landscape lake water bodies can be extended.
5.4 Landscape water bodies and landscape wetlands using reclaimed water Suitable aquatic plants should be cultivated and harvested regularly.
5.5 Reclaimed water as the water for landscape wetland environment should consider the potential impact of salinity and its accumulation on plant growth, and choose salt-tolerant plants.
Take measures to control salt and salt.
5.6 During the utilization process, attention should be paid to the sedimentation and water quality changes of the landscape water body, and regular sediment dredging should be carried out.
6 Safety requirements
6.1 For landscape water bodies and landscape wetlands using reclaimed water, the “recycled water” logo and instructions should be placed in a prominent position.
6.2 Landscape water bodies and landscapes using reclaimed water The water in the wetlands is vivid and plants should not be eaten.
6.3 Use of reclaimed water for landscape environment, not for drinking, living washing and activities that may be in direct contact with the human body.
7 Sampling and monitoring
7.1 Sampling requirements
7.1.1 Reclaimed water quality monitoring sampling points should be located at the total outlet of the reclaimed water plant or the reclaimed water replenishment point. Sample storage and management should be
HJ493 is executed. It is advisable to add monitoring points to the landscape water body during the water-prone algae season.
7.1.2 The water sample should be a 24h mixed sample, sampled at least every 2h, on a daily average.
7.2 Monitoring frequency
Daily monitoring of turbidity, residual chlorine, pH, total phosphorus, ammonia nitrogen, fecal coliforms once, weekly monitoring of total nitrogen, color 1 time, monthly supervision
The BOD was measured 51 times.
7.3 Monitoring and analysis methods
The monitoring and analysis methods of the reclaimed water quality indicators are shown in Table 2.
Table 2 Monitoring and analysis methods
No. Monitoring project monitoring method basis
1 pH glass electrode method GB/T 6920
2 5th Biochemical Oxygen Demand (BOD5) Dilution and inoculation method HJ505
3 turbidity visual nephelometry GB/T 13200
4 total phosphorus (in P) ammonium molybdate spectrophotometry GB/T 11893
5 total nitrogen (in N) alkaline potassium persulfate digestion UV spectrophotometry HJ636
Table 2 (continued)
No. Monitoring project monitoring method basis
6 ammonia nitrogen (in N terms)
Distillation-neutralization titration
Nessler reagent spectrophotometry
HJ537
HJ535
7 Fecal coliform multi-tube fermentation method HJ/T 347
8 Residual chlorine N,N-diethyl-1,4-phenylenediamine spectrophotometry HJ586
9 color platinum cobalt colorimetric method GB/T 11903
7.4 Tracking and monitoring
7.4.1 When using reclaimed water as the landscape environment water, the user should follow the monitoring and regeneration according to the water source of the local reclaimed water plant.
Emerging micro-pollutants such as water endocrine disruptors (EDCs), pharmaceuticals and personal care products (PPCPs).
7.4.2 When using reclaimed water as the landscape environment water, it is advisable to carry out water quality and sediment on landscape water bodies and landscape wetlands using reclaimed water.
Tracking and monitoring of surrounding air and groundwater, timely discovering problems in the use of reclaimed water landscape environment.
references
[1] Technical Guidelines for Wastewater Recycling (Department of Housing and Urban-Rural Development, Jiancheng [2012] No. 197).
[2] Urban Wastewater Recycling Technology Policy (Ministry of Construction, Ministry of Science and Technology, Jianke [2006] No. 100).
[3] Zheng Xingcan. Level 1 A stable compliance technology for urban sewage treatment plants. Beijing. China Building Industry Press,.2015.
[4] NRMMC.EPHC
[5] AQUAREC.GuidelineforqualitystandardsforwaterreuseinEurope.2006.
[6] USEnvironmentalProtectionAgency.GuidelinesforWaterReuse.2012.
[7] Ministry of Land, Infrastructure, Transport and Tourism, Urban Area Improvement Bureau, Sewerage Department. Water quality benchmark for reuse of sewage treatment water..2005.