Make a Comparative study of the river pollution levels of any five rivers of India flowing in five different states during the Pre-lockdown and Lockdown period.
Answers
The novel coronavirus disease (COVID-19) lockdown has put millions in the throes of adversity — and yet, there is a reason to celebrate. Over a month into the nationwide lockdown, air and water pollution levels have shrunk and the wildlife is free.
We have inadvertently been cruel to nature, but the lockdown elicited a change of course. They say ‘Coronavirus is Earth’s vaccine. We’re the virus’. Perhaps, it’s true.
Ganga
The river became a dumpyard for untreated sewage and industrial waste. According to CPCB, more than half of wastewater treatment plants in the basin do not comply with the discharge norms.
Since 1985, several programmes and schemes have been launched to clean the Ganga. It began with the Ganga Action Plan I, followed by Ganga Action Plan II.
In 2015, the biggest-ever initiative, Namami Gange was launched with a budget of over Rs 20,000. Despite numerous programmes and huge funds, the Ganga still runs polluted.
COVID-19’s gift to Ganga
On April 4, at Varanasi’s Nagwa Nala, the Dissolved Oxygen (DO) values were found increased to 6.8 milligram/litre against 3.8 mg/l on March 6, showcasing an extraordinary improvement of 79 per cent in DO values.
PK Mishra, professor of chemical engineering at the Indian Institute of Technology, Banaras Hindu University, attributed these changes to industrial lockdown and rainfall on March 15 and 16 that increased the water levels of Ganga.
He stated that 30 per cent of the total BOD load was due to industries along the river, which amounted to 130-150 tons per day.
The total effluent dumped into the Ganga was around 6,500-6,700 million litres per day (MLD) in its UP stretch and onwards. Around 10 per cent was toxic load from industries, around 700 MLD.
Since all major polluting industries are closed, the toxic load is off the river.
Ganga water at Haridwar and Rishikesh was reported fit for drinking due to 500 per cent decrease in sewage and industrial effluents. A dip in the number of visitors at ghats in Haridwar also helped the river water quality.
In a CPCB assessment report, it was found that most stretches of the Ganga from Garhmukteshwar in Uttar Pradesh to West Bengal were not only violating drinking water standard, but recorded very less dissolved oxygen and high of total coliform (bacteria from human and animal waste) levels.
Many of the same stretches, according to CPCB’s real-time water quality monitoring of the Ganga on April 19, met the drinking water standards; the biological oxygen demand was < 3 mg/l, dissolved oxygen was >4 mg/l and pH 6 to 9.
The causes
More than 80 per cent of pollution in the Ganga is due to domestic sewage from surrounding towns and villages. The rest is contributed by industrial waste.
During the lockdown, domestic sewage would have increased owing to increased demand for water to maintain hand-washing hygiene. Industrial waste, however, stopped entering the Ganga.
Other activities such as tourism, fairs, bathing and cloth washing near the ghats were curtailed. Experts said these observations reflected that domestic sewerage was not the only cause of concern.
Zero industrial pollution increased quality of water in the Ganga, According to another analysis by Manoj Mishra, convenor, Yamuna Jiye Abhiyan.
There is an urgent need to:
Reinvestigate the main source of pollution in Ganga and reorient all river cleaning policies and programmes based on lockdown findings.
Industries need to strictly adhere to discharge norms accompanied with strong enforcement of laws and regulations vis-a-vis strong monitoring and vigilance framework.
Setting up of effective interventions to clean rivers, reliable, representative and comprehensive data collected at high frequency in a disaggregated manner. The CPCB and Central Water Commission have installed 36 real-time water quality monitoring stations on the Ganga, the Yamuna and tributaries of Ganga, but that is not sufficient. There is an urgent need to expand the network in more places.
Over-extraction and over-exploitation of Ganga’s waters have rendered long stretches of the river completely dry for much of the year. A river’s ability to cleanse and recharge itself is significantly impaired by over-extraction of surface and ground water for irrigation, industrial and domestic usage. There is a need to maintain river flow to keep it clean for longer run.
Education and awareness needs to be carried out strategically.
An important question here is: Do we really want such changes to happen at the cost of a pandemic? Or is there an opportunity to reconsider our development paradigms, lifestyles and economic pursuits so that there is less impact on our planet?
Unanimously, synergy for absolute symbiosis between nature and human being is the need of the hour.
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