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GB/T 18920-2020 English PDF (GBT18920-2020)

GB/T 18920-2020 English PDF (GBT18920-2020)

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

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.
GB/T 18920-2020
GB
NATIONAL STANDARD OF THE
PEOPLE 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
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
GB/T 7489 Water quality - Determination of dissolved oxygen - Iodometric method
GB/T 11913 Water quality - Determination of dissolved oxygen -
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.
3.5
street sweeping use
Reclaimed water used for road dust suppression and road sweeping.
3.6
fire protection use
Reclaimed water used for fire protection in municipal works, residential quarters and factories.
3.7
construction site and concrete production use
Water used for soil compaction, dust suppression and concrete in construction sites.
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.
4.2 Users of water for urban miscellaneous use should select the items in Table 2 in a targeted manner according to the water source of the local reclaimed water plant.
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.
Table 1 -- Basic control items and limits of
water quality of water for urban miscellaneous use
No. Item Toilet flushing use, Urban landscaping,

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