Pollution in River Ganga

December 2023

According to the Ministry of Jal Shakti, though the Namami Gange Programme has been able to reduce the overall pollution load in the Ganga River, the river still remains polluted.

Pollution in the Ganga River:

At least 71% of the river’s monitoring stations reported alarming levels of faecal coliforms in January 2023.
Faecal coliforms are a group of bacteria found in the gut and faeces of warm-blooded animals, which enters rivers through the discharge of untreated sewage. While Uttarakhand had permissible levels of faecal coliform (less than 2,500 most probable number (MPN) per 100 ml), numbers in three other states - UP, Bihar and West Bengal - are alarming.

Why does river Ganga still remain polluted?

Untreated waste continues to be discharged in 60% of Ganga.
While the five major states through which the river flows generated 10,139.3 million litres per day (MLD) of sewage, they had a combined sewage treatment capacity of only 40%. Uttarakhand is the only state with sufficient treatment capacity.

Wider challenges:

Higher biochemical oxygen demand (BOD) at the majority of the stations.
🔸 BOD is a measure of the oxygen required by aerobic microorganisms to biochemically oxidise organic matter. It affects the amount of dissolved oxygen in rivers.
🔸 The higher the BOD, the lesser the oxygen available to aquatic life.

Lax monitoring as the data collection and dissemination remains challenging.

Treating industrial and chemical waste: Sewage treatment plants (STPs) are going to be the mainstay of river cleaning.

Waste to wealth: Identifying, developing and deploying technologies to treat waste to generate energy, recycle materials, and extract resources of value.