New Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard which is identical with ISO 20419 : 2018 ‘Treated wastewater reuse for irrigation - Guidelines for the adaptation of irrigation systems and practices to treated wastewater’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Environment Protection Sectional Committee and approved by the Chemical Division Council.

The composition of treated wastewater (TWW) is different from that of freshwater. TWW contains more nutritional elements and microbial populations. These characteristics can severely disrupt the operation of the TWW irrigation systems, which can result in poor performance of the system, and potentially harmful to the environment. Hence, need has been felt to develop standard to provide guidelines on how to use TWW in or with irrigation systems and to protect them from clogging. To follow the uniform practices globally, the Committee felt that it would be more convenient to prepare this standard by adoption of ISO 20419 on dual numbering system.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appears referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.