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Fresh Water is Turning Saltier | UPSC
Fresh water is turning saltier, flags study
WHY IN NEWS:
Passaic river in New Jersey has turned saltier in 30 years. This article was published in Downtoearth, according to a recent study published in journal Biogeochemistry.
SYLLABUS COVERED: GS 1 :3 : Fresh Water Resources : Pollution
FRESHWATER SALINIZATION SYNDROME (FSS)
- Introducing salt into the environment — for de-icing roads, fertilising farmlands and other purposes — releases toxic chemicals that pose a threat to freshwater supply system.
- Freshwater salinization can poison drinking water and increase chloride concentrations in it over time.
- The research claimed that an increase in concentration of chloride on a global scale: Passaic river in New Jersey has turned saltier in 30 years.
According to the research, FSS is caused by:
- Road salts
- Human-accelerated weathering of infrastructure, rocks and soils
- Sea-level rise and saltwater intrusion
- Evaporative concentration of salt ions from hydrologic modifications and climate
- Disturbance of vegetation and local groundwater hydrology
A SALTY FUTURE
- Groundwater has been salinised by road salts over 100 years in the United States.
- Salt can be retained in watersheds over time in soils and groundwater, which drives the long-term increasing trends over all seasons.
- The study noted the risks of exposure to co-occurring, multiple heavy metals in drinking water in developing countries.
- More than 57 per cent of India’s groundwater was contaminated with nitrate, fluoride and arsenic, according to an analysis of the government data in the State of India’s Environment in Figures, 2020.
- Groundwater in at least 249 districts in 18 states and Union territories was found to be saline.
- Groundwater was unfit for consumption since it affects the digestive system, raises blood pressure and hypertension. .
SALT WATER INTRUSIONS
- Up to 220 million people globally are at risk of exposure to elevated levels of arsenic in groundwater, which can also be mobilised by saltwater intrusion primarily in Asia.
- Surface waters are also at risk from FSS from oil and gas extraction and other forms of resource extraction.
- They found decreasing trends in nutrient concentrations in rivers due to regulations, but increasing trends in salinisation due to lack of adequate management and regulations.
- The report, World’s Forgotten Fishes, stated that freshwater fish provide main source of protein to 200 million people across Asia, Africa and South America.
- The industry provides jobs and livelihoods to 60 million people, more than half of whom are women.
- More work is needed to examine the extent of FSS induced by resource extraction and groundwater reserves.
- Approximately 70 per cent of the Earth is covered by water; only about 2.5 per cent of that is fresh water.
- Undermining this problem may entail that freshwater would not be as ‘fresh’ or have the same desired chemical, biological and physical properties, and provide the same ecosystem services as in previous decades.
Conservation groups behind the report, including World Wide Fund for Nature (WWF) and Global Wildlife Conservation, point to a combination of pressures on global freshwater fish populations, including:
- Habitat degradation
- Poorly planned dams
- Releasing wastewater and draining wetlands
- Introduction of invasive species
- Climate change