Foreword

In India, domestic sewage and sullage is the main source of water pollution, especially in and around large urban centers. During the last fe\.N decades, although water supply has been significantly augmented, sewage disposal has not kept pace. This has resulted in generation of huge amount of wastewater without adequate arrangements for collection, treatment and disposal. For rational planning of a comprehensive strategy to cope up with this problem, assessment of total sewage generation, its collection, treatment and disposal is essential. Accordingly, the Central Pollution Control Board carried out a performance study of all the thirty sewage treatment plants in Delhi. The findings of the study are presented in this report. An attempt has also been made to compile data on sewage being discharged into the river Yamuna /Agra Canal in order to get a comprehensive    picture      of sewage management in Delhi. Information on

sewerage & its functioning as observed and collected from Delhi Jal Board in different parts of the city is also presented in this report. In the present report, an attempt has also been made to identify the gap between wastewater generation   and existing treatment in Delhi.

A team of scientific and technical officials of the Central Pollution Control Board under the guidance of Dr. R. C. Trivedi and Dr. Sanjeev Agrawal, Scientist 'C' conducted the study. We hope, the information contained in the report would be useful to the concerned authorities, organizations, academic institutions, researchers and others involved in planning wastewater management in Delhi.