By Shakoor Rather

Experts advise deploying cutting-edge chemical solutions to tackle pollution in world’s most contaminated waterways

The Yamuna River flows black through Delhi, its waters so toxic that even touching them can cause skin burns. Once considered sacred, this largest tributary of the Ganges now carries industrial waste, sewage, and agricultural runoff that threatens the lives of millions who depend on it for drinking water.

This stark reality confronts India daily, a nation where an estimated 70% of water sources are contaminated, affecting over 600 million people, according to a report by NITI Aayog. But as the country searches for solutions, a growing coalition of chemists, researchers, and water specialists advise deploying innovative solutions that blend ancient Indian wisdom with cutting-edge chemical science to restore the nation’s polluted waterways.

The Enormity of India’s Water Challenge

India’s water pollution crisis represents one of the world’s most complex environmental challenges. The Ganges alone receives 1.3 billion liters of untreated sewage daily, according to an article published in the journal Economic Analysis and Policy while industrial discharge adds another layer of contamination through heavy metals, dyes, and pharmaceutical residues. Agricultural runoff contributes nitrogen and phosphorus compounds that trigger massive algal blooms, creating dead zones in rivers and lakes.

“Indian waterways face unique chemical challenges from pollutants such as heavy metals (from tanneries and industries), pesticide residues (from intensive agriculture), pharmaceutical waste (from hospitals and drug manufacturing), religious waste (like idol immersion), and toxic dyes (from textile hubs),” explains Prof. Ajit Kumar Sharma from Lovely Professional University’s Department of Chemistry.

“These pollutants are persistent, toxic, and often poorly regulated, posing severe threats to human health and ecosystems,” Prof Sharma said.

The crisis extends beyond surface water. A study published in the journal Water in 2023 found that groundwater contamination affects an estimated 1.8 million people worldwide who lack access to safe drinking water, with India contributing significantly to this statistic due to industrial chemicals, bacteria, viruses, and heavy metals infiltrating water supplies.

Climate Change Intensifies the Challenge

Climate change is fundamentally altering the chemical landscape of water pollution and making existing challenges more severe.
t=”274″ data-end=”277″ />>According to Ajit K Sharma, Managing Director for India and South Asia at the Royal Society of Chemistry (RSC),
“It is also increasing the frequency and severity of extreme weather events such as floods and droughts. “These conditions can mobilise pollutants, for example in soils and sediments, or concentrate them in shrinking water bodies, placing increasing pressure on water resources and amplifying pollution risks.”

Chemistry as the Solution

As the country grapples with water pollution, advanced chemical interventions are emerging as powerful tools in the fight against it. At the forefront are advanced oxidation processes that break down persistent organic pollutants, green chemistry approaches for treating industrial waste, and innovative nanomaterials for water filtration and remediation.

“Chemistry can provide the tools and knowledge needed to address these challenges,” explains Sharma from RSC. “From developing cost-effective sensors for monitoring pollutants, to advancing our understanding of pollutant fate and behaviour, the chemical sciences underpin the evidence base needed for effective interventions and policy. Importantly, chemistry also enables the design of safer and more sustainable by design alternatives and innovative water treatment technologies to reduce the release and impact of harmful chemicals.”

“Green chemistry, a branch of Chemistry, plays a pivotal role in shifting from pollution remediation to prevention by enabling the design of cleaner, more sustainable processes and products,” notes Poonam Sewak, VP of Programs & Partnerships at Safe Water Network. “Through green chemistry principles, chemists develop materials and reactions that minimize or eliminate the generation of hazardous substances at the source.”

This prevention-focused approach represents a paradigm shift from traditional cleanup methods. Instead of treating pollution after it occurs, green chemistry redesigns industrial processes to eliminate harmful byproducts entirely. The approach includes using safer solvents, renewable feedstocks, and energy-efficient synthesis methods.

Success Stories and Regional Solutions

Water quality challenges vary significantly across different regions, requiring tailored approaches. “Since water contamination varies by region, a one-size-fits-all solution doesn’t work,” emphasizes Sharma from RSC. “Instead, collaborative efforts combining local expertise with global innovations are essential. Chemical and technological approaches must be tailored to regional challenges.”

Across the world, including India, scientists and researchers are deploying innovative chemical and technological solutions to improve water bodies. “From large-scale projects like the Ganga river cleanup to city-level initiatives in Karnataka focused on sustainable rainwater harvesting, the impact of science is evident in shaping more resilient water ecosystems,” the RSC MD notes.

One promising example is a solar-powered device that can generate both clean water and clean fuel simultaneously. “Innovations like these—implemented at small scales—can not only address local water challenges but also contribute to broader sustainability goals,” he explains.

Indigenous Knowledge Meets Modern Science

India’s traditional water purification methods are inspiring contemporary chemical solutions. The ancient practice of storing drinking water in copper and silver vessels utilized what scientists now understand as the oligodynamic effect—the ability of certain metals to kill harmful microorganisms.

“Traditional use of multani mitti (Fuller’s earth) and ash for filtering and purifying water is based on their high surface area and ion-exchange capacity,” explains Prof. Sharma. “Clay is being widely studied as a low-cost and effective material to clean polluted water, especially for removing harmful pesticides and organic impurities from the aquatic environment,” the LPU professor adds.

Modern nanotechnology has amplified these traditional concepts. Scientists have developed nanoclay materials that can absorb large amounts of common pesticides like imidacloprid and can be easily reused. Similarly, nanoparticles based on silver, copper, and zinc release ions that break down microbial cell walls, providing potent water disinfection at the nanoscale.

Understanding Pollutant Behavior

A critical aspect of addressing water contamination involves understanding how pollutants behave and spread in water systems. “Understanding the sources and spread of contaminants in groundwater systems allows scientists to identify targeted, effective remediation strategies,” explains Sharma. “This is critical because contaminated water still affects millions of people globally.
An estimated 1.8 million lack safe, sustainable drinking water.
Pollutants like bacteria, viruses, chemicals, and heavy metals can enter supplies, putting vulnerable communities at risk of disease.

Community-Powered Monitoring

Recognizing that effective water management requires grassroots participation, experts are developing accessible monitoring systems for communities.

The Ministry of Jal Shakti has trained over 500,000 women to test water using Field Test Kits, said Sewak.
These kits help assess water quality parameters like pH, turbidity, chlorine, and heavy metals.

Rural and low-resource communities benefit most from simple, durable tools needing little training or infrastructure,” she explains.
These low-cost kits change color when exposed to pollutants, and users compare results using basic color charts.

The government also launched an online portal for uploading results, helping communities access and act on water quality data.

Climate Change: A New Chemical Reality

Rising temperatures accelerate chemical reactions, leading to the formation of more toxic compounds from existing pollutants. Warmer conditions worsen eutrophication and trigger more frequent algal blooms.
Shifting rainfall patterns increase runoff during storms and concentrate pollutants during droughts.

Higher temperatures speed up chemical reactions, forming more toxic or persistent compounds from existing pollutants,” Sewak warns.
“They also break down pesticides faster, creating harmful by-products, and release more nitrogen and phosphorus from soil.”

This changing pollution profile needs adaptive monitoring to track both known and emerging contaminants under climate stress.
Programs like Atal Bhujal Yojana and ISRO’s Bhuvan platform help map watersheds and groundwater for better resource management.

The Path Forward: Innovation and Collaboration

The RSC India promotes sustainability through initiatives like green chemistry research and thematic events like Water and the Environment.
“We engage with policymakers and researchers to improve strategies for managing water and pollution,” notes Sharma.
“This includes recent studies on PFAS and other persistent chemicals,” he added.
“We believe chemistry-led innovation, backed by investment and collaboration, can help restore ecosystems and ensure water security.”

Looking ahead, experts identify nanotechnology-based photocatalytic systems powered by artificial intelligence as potentially transformative. These materials use India’s abundant sunlight to break down both organic and inorganic pollutants while killing harmful microorganisms. Combined with AI-powered sensors providing real-time water quality updates, such systems could enable decentralized, small-scale water purification.

Building Chemical Literacy

Public understanding of chemistry and chemicals plays a crucial role in tackling water pollution, emphasizes Sewak.

Understanding basic water pollution chemistry encourages responsible actions like proper waste disposal and eco-friendly practices.