GB20922-2007

The reuse of urban recycling water - Quality of farmland irrigation water

城市污水再生利用农田灌溉用水水质

GB 20922-2007 est une norme nationale chinoise obligatoire en vigueur : The reuse of urban recycling water - Quality of farmland irrigation water. Secteur : Construction. Thème principal : Sécurité des produits. Entrée en vigueur : 1 oct. 2007.

L’applicabilité dépend du périmètre du produit, de la voie de certification, des avis des autorités et des règles de transition. Demandez une traduction ou vérifiez la source avant d’utiliser cette fiche pour une décision de conformité.

Aperçu de conformité

Cet aperçu n’est actuellement disponible qu’en anglais.

Champ d’application

This standard applies specifically to farmland irrigation water sourced from urban wastewater treatment plant effluents. It categorizes irrigation targets into fiber crops, dry grain and oil crops, wet grain (paddy), and open-air vegetables. It is crucial to note that this standard does not apply to untreated raw sewage or direct industrial process water. Compliance is essential for agricultural projects utilizing reclaimed water in China.

Exigences techniques

The standard establishes water quality parameters divided into basic control items and selective control items. Chapter 4, Table 1 detailing basic control items, is strictly mandatory, while other sections are recommended. The basic parameters include limits on BOD5, CODcr, suspended solids (SS), heavy metals (such as mercury, cadmium, arsenic), and microbiological indicators like fecal coliforms. Selective control items cover specific pollutants like benzene, formaldehyde, and various trace elements depending on the industrial pollutants received by the treatment plant. Furthermore, the standard dictates specific treatment requirements: fiber and dry grain crops require enhanced primary treatment, whereas paddy and open-air vegetables mandate secondary treatment.

Méthodes d’essai

The standard outlines comprehensive monitoring and analysis methods by referencing various national standards (GB/T series and HJ/T series). Basic control items must be tested regularly, while selective items are monitored based on the specific industrial pollutants present. Testing covers physical, chemical, and biological parameters, utilizing methods such as atomic absorption spectrophotometry for heavy metals and gas chromatography for organic compounds. Monitoring frequency and sampling points must comply with the NY/T 396 technical specification for agricultural water quality.

Questions fréquentes

What products or systems are regulated under GB 20922-2007?

It regulates the quality of reclaimed urban wastewater used for irrigating agricultural crops, including fiber crops, grains, and open-air vegetables.

Are the requirements in GB 20922-2007 mandatory?

Yes, Chapter 4, Table 1, which specifies the maximum limits for basic control items, is strictly mandatory. Other chapters and tables are recommended.

What are the treatment level requirements for different crops?

Fiber crops and dry grains require the wastewater to undergo enhanced primary treatment, while paddy grains and open-air vegetables require secondary treatment.

The summary above provides a high-level overview of GB 20922-2007. To ensure complete compliance for your agricultural or water treatment projects entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 20922-2007 today to access all detailed parameter tables, specific limit values, and testing procedures.

Indications d’applicabilité

Type: Protection de l’environnement
CCS: P40
ICS: 13.060
Autorité compétente: Ministry of Housing and Urban-Rural Development
Comité technique: Ministry of Housing and Urban-Rural Development