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GB/T 18920-2020 PDF English

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GB/T 18920-2020: The reuse of urban recycling water - Water quality standard for urban miscellaneous use
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GB/T 18920: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 18920-2020English135 Add to Cart 0-9 seconds. Auto-delivery The reuse of urban recycling water - Water quality standard for urban miscellaneous use Valid
GB/T 18920-2002English70 Add to Cart 0-9 seconds. Auto-delivery The reuse of urban recycling water -- Water quality standard for urban miscellaneous water consumption Obsolete

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GB/T 18920-2020: The reuse of urban recycling water - Water quality standard for urban miscellaneous use


---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18920-2020
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 13.060 P 40 Replacing GB/T 18920-2002 The reuse of urban recycling water - Water quality standard for urban miscellaneous use Issued on. MARCH 31, 2020 Implemented on. FEBRUARY 01, 2021 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Water quality indicators... 7 5 Sampling and monitoring... 8 6 Safe use... 10

Foreword

This Standard was drafted according to the rules given in GB/T 1.1-2009. This Standard replaces GB/T 18920-2002 “The reuse of urban recycling water - Water quality standard for urban miscellaneous water consumption”. Compared with GB/T 18920-2002, the main technical changes, except for editorial changes, are as follows. - DELETE GB/T 3181, GB/T 7494, GB/T 11898 in the normative references; ADD references to GB 50084, CJ/T 158, HJ 505, HJ 506 (see Clause 2 of this Standard, Clause 2 of the 2002 edition); - ADD the term “reclaimed water” and its definition (see 3.1 of this Standard); - In Table 1, REVISE the basic control item “total coliforms” TO “Escherichia coli, and MODIFY some water quality indicator values such as turbidity, biochemical oxygen demand after 5 days, ammonia nitrogen, total dissolved solids, total chlorine (see Table 1 of this Standard, Table 1 of the 2002 edition); - ADD the limits of chloride and sulfate in the selective control items (see 4.2 of this Standard); - MODIFY the sampling and testing frequency of some water quality indicators such as turbidity and total chlorine (see Table 5 of this Standard, Table 3 of the 2002 edition); - DELETE “Standard implementation and supervision”; SEPARATE “Safe use” into a clause (see Clause 6 of this Standard, Clause 6 of the 2002 edition). This Standard was proposed by Ministry of Housing and Urban-Rural Development of the People's Republic of China. This Standard shall be under the jurisdiction of National Technical Committee on Urban Water Supply and Drainage of Standardization Administration of China (SAC/TC 434). Drafting organizations of this Standard. Central and Southern China Municipal Engineering Design and Research Institute Co., Ltd., China Urban Construction Design and Research Institute Co., Ltd. Main drafters of this Standard. Zhang Huaiyu, Li Shuyuan, Wang Weiwei, Wan Nianhong, Zhang Xiaoping, Yu Qinfang, Li Lu, Cai Shiyan, Bao Renbing, Sun Jian. The previous released version replaced by this Standard is as follows. - GB/T 18920-2002. The reuse of urban recycling water - Water quality standard for urban miscellaneous use

1 Scope

This Standard specifies the terms and definitions, water quality indicators, sampling and monitoring, safe use of water for urban miscellaneous use in the reuse of urban recycling water. This Standard applies to reclaimed water for miscellaneous use, such as toilet flushing, vehicle washing, urban landscaping, street sweeping, fire protection, construction site and concrete production.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 5750.4 Standard examination methods for drinking water - Organoleptic and physical parameters GB/T 5750.5 Standard examination methods for drinking water - Nonmetal parameters GB/T 5750.6 Standard examination methods for drinking water - Metal parameters GB/T 5750.11 Standard examination methods for drinking water - Disinfectants parameters GB/T 5750.12 Standard examination methods for drinking water - Microbiological parameters GB/T 7488 Water quality - Determination of biochemical oxygen demand after 5 days (BOD5) - Dilution and seeding method

3 Terms and definitions

For the purpose of this document, the following terms and definitions apply. 3.1 reclaimed water Water obtained after urban wastewater is treated by a proper regeneration process. It meets certain water quality requirements, meets certain functional requirements, and can be used beneficially. [GB/T 19923-2005, definition 3.2] 3.2 urban miscellaneous use Non-drinkable reclaimed water used for toilet flushing, vehicle washing, urban landscaping, street sweeping, fire protection, construction site and concrete production, etc. 3.3 toilet flushing use Reclaimed water used for toilet flushing in public and residential toilets. 3.4 urban landscaping use Water used for gardens, parks, roadside trees and road isolation green belts, venues and public lawns, and similar areas other than special trees and special flowers.

4 Water quality indicators

4.1 The basic control items and limits for water quality of water for urban miscellaneous use shall meet the requirements of Table 1. 4.3 Water for concrete shall also comply with the relevant provisions of JGJ 63. 4.4 For water used in the automatic sprinkler fire-fighting system, in addition to meeting the requirements of Table 1, the suspended matter shall meet the requirements of GB 50084.

5 Sampling and monitoring

5.1 Sampling and preservation 5.1.1 The design and organization of water quality sampling shall be implemented according to the provisions of GB/T 12997 and GB/T 12998.The water sample is a 24 h mixed sample, which shall be sampled at least once every 2 h, calculated as the daily average value. 5.2 Analysis method The analysis method of basic control items shall be implemented according to Table 3, and the analysis method of selective control items shall be implemented according to Table 4. 5.3 Testing frequency The sampling and testing frequency of basic control items of water for urban miscellaneous use shall not be less than the frequency specified in Table 5.

6 Safe use

6.1 Water source and pipeline connection 6.2 Marking 6.2.1 The exterior of pipelines, equipment and facilities of water for urban miscellaneous use shall be provided with obvious warning marks and instructions at prominent locations. 6.2.2 The following places shall be marked. 6.2.4 The mark of water tanks and water appliances for water for urban miscellaneous use shall be implemented according to the provisions of 6.2.3, and the size shall be eye-catching. When it is difficult or not eye-catching enough to paint or wind the mark, the way of hanging signs can be adopted. 6.2.5 The gate well cover shall be marked with the words “RECLAIMED WATER” and “NO DRINKING”. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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