The Yamuna River in Delhi is blanketed with toxic froth ahead of the festive season, raising serious health concerns. Experts explain the immediate and long-term health risks of exposure to this polluted water, from skin irritation to respiratory and neurological impacts
Foam in Yamuna River
In preparation for Chhath Pooja, Delhi has faced recurring debates and actions around the toxic foam in the Yamuna River, where devotees gather for rituals. Why Does Foam Occur in the Yamuna River?
Pollutant accumulation: The river’s lean flow during winter time reduces the natural dilution of pollutants, allowing them to concentrate.
Detergents: The main contributors to foaming are phosphates from detergents used in domestic and industrial activities. These chemicals lead to surfactant buildup in the water.
Industrial effluents: Discharge from industries upstream also contributes chemicals that create foam.
Bacteria activity: Anaerobic bacteria act on the pollutants, especially as water falls from heights, such as at the Okhla barrage, aiding foam formation.
Seasonal changes: The onset of winter reduces oxygenation, aggravating the foaming.
About Defoaming Process:
Defoamer solution: A polyoxypropylene-based defoamer, approved by the US FDA, is used to suppress foam effectively without harming water quality.
Dilution ratio: The defoamer is diluted at a ratio of 1:100, minimizing any adverse effects from constituents like silicone.
Ecological safety: Testing indicated no reduction in dissolved oxygen levels after defoaming, implying it doesn’t impact the river’s ecology.
Temporary solution: Spraying is focused on the Okhla barrage area, and while effective for short-term foam control, it is not a permanent fix for pollution.
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