Case study NCT Delhi on the Yamuna River
The study site is located close to the Oklah barrage in the south eastern part of New Delhi. Here, the Yamuna River is heavily polluted by poorly treated and untreated urban waste water and the existing drinking water production wells in the alluvial plain produce bank filtrate of low quality. Before distribution, the bank filtrate is treated for nitrification, in order to oxidize the ammonium present. The current treatment plant is designed to treat 4 mg/L of ammonium – however, it is predicted that in future up to 10 mg/L of ammonium are likely to occur. Different options to sustain drinking water quality with special focus on nitrogen species will be evaluated in SAPH-PANI such as improving source water, in-situ remediation (e.g. oxygen injection into the aquifer) adapted well operation or enhancing the extensive post-treatment. A transect of observation wells some kilometres upstream has been investigated previously generating basic background data on hydrogeology and hydro-chemical evolution.