Published on: November 10, 2021
FROTHING IN DELHI’S YAMUNA
A layer of froth was seen floating over parts of the Yamuna river near Kalindi Kunj on the eve of Chhath pooja
What causes frothing in the Yamuna
- The froth is a sign of a polluted river
- Release of untreated or poorly treated effluents, including sewage from those parts of the city that are not connected to the sewerage network and industrial waste, could lead to frothing.
- Phosphates in the river form the froth
- Surfactants and phosphates from detergents in households and industrial laundry find their way into the river, as all the sewage is not treated
- Around this time of the year, the river is in a lean phase and the water flow is less. Pollutants, therefore, are not diluted.
- The turbulence at the barrage near Okhla generates foam from the phosphates
What has been done about it
- Officials banned the sale, storage and transportation of soaps and detergents not conforming to the quality standards set by the Bureau of Indian Standards (BIS).
- The fifth report of the NGT-appointed Yamuna Monitoring Committee notes that though BIS standards for detergents have been improved, it is not clear whether these standards will actually be enforced
- Samples are being collected from the river near the Okhla barrage to check phosphate levels.