New Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 2) which is identical with ISO 20468-2 : 2019 ‘Guidelines for performance evaluation of treatment technologies for water reuse systems - Part 2: Methodology to evaluate performance of treatment systems on the basis of greenhouse gas emissions’ 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 role of water reuse is growing for urban areas in many countries including landscape irrigation, industrial uses, toilet and urinal flushing, firefighting and fire suppression, street cleaning, environmental and recreational uses (ornamental water features, water bodies’ replenishment, etc.) and car washing. Hence, need for standardization for evaluation of levels of service and water reuse system performance has been felt. Considering the importance to develop standard for providing guidelines for performance evaluation of treatment technologies for water reuse systems and to follow the uniform practices globally, the Committee felt that it would be more convenient to prepare this standard by adoption of ISO 20468 series of standards on dual numbering system.

This India Standard is published in two parts. The other part in this series is:

Part 1 General.

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.