Pollution Research Paper

Vol 39, Issue 4, 2020; Page No.(1017-1025)

PERFORMANCE STUDY ON SEWAGE TREATMENT PLANTS IN DELHI BASED ON ADOPTED ADVANCED TECHNOLOGIES

V. HIMA JWALA, P. BRAHMAJI RAO AND S. AGRAWAL

Abstract

Delhi has a population of over 13.9 million as of 2018 and it is estimated to increase to 72 million by 2051 at a growth rate of 44%. The Delhi Development Authority estimated the water requirement and wastewater generation by 2051 is 19728 Million Litres per Day (MLD) and 17750 MLD, respectively. The sewage generation in Delhi is about 4000MLD daily. The installed capacity of the Sewage Treatment Plant (STP) is about 2815MLD to treat the entire generated sewage, which is about 70% of total sewage. Delhi Jal Board has adopted advanced technologies to treat sewage to comply with the notified standards as prescribed under the Environment (Protection) Act, 1986. During the year (2017/18/19), 12 numbers of STPs have been studied and sewage water samples have been analysed for desired physicochemical parameters. The results have indicated the consistent good performance of all the sewage treatment plants and met the discharge standards concerning compulsory parameters pH, BOD, COD and TSS. It is important to note that the intake point (untreated sewage) and discharge point (treated sewage) is of the same drain even after proper treatment complying with the desired standards, nullifying the treatment cost. The present study gives an overview of technologies adopted by STPs in Delhi and its management along with performance evaluation, which may help to explore (an idea) in water conservation methods instead of discharging into river Yamuna.

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