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We use cookies to ensure the best experience for you on our website. Indian capital most polluted for third straight year in , according to a Swiss group that measures air quality. Published On 11 Nov If we are scared, then how can we pray? More from Gallery. Most Read. At least 3 killed in Afghanistan mosque blast. Should nations go nuclear to save the planet? Experts say the 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.
Surfactants and phosphates from detergents in households and industrial laundry find their way into the river, as all the sewage is not treated, Sengupta said. Explaining the reasons for foaming around this time of the year, Sengupta said the river is in a lean phase and the water flow is less. Pollutants, therefore, are not diluted. The water falling after discharge from the Okhla barrage causes the surfactants and foaming agents present in the wastewater or in the sludge on the river bed to get agitated, forming foam.
Officials of the Delhi Jal Board have been pointing to the location of the frothing to suggest that the phenomenon has little to do with the DJB itself. The frothing is seen only near Kalindi Kunj, downstream of the Okhla barrage, according to a senior DJB official, who added that if the sewage from Delhi was to blame, the frothing would have been seen across the entire stretch of the river, after the Wazirabad barrage, since drains begin emptying into the river from there.
In a briefing on Monday, Raghav Chadha, Vice-Chairman, DJB, said the Okhla barrage is maintained by the Irrigation Department of the Uttar Pradesh government, and that the layer of foam floating in the river near the Okhla barrage is due to detergents and toxic waste. The water falls from a height, so the untreated waste turns into foam.
However, it is not only near the Okhla barrage where phosphates are present in excessive quantities in the river.
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