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India's fly ash Problem
Apr 20, 2016

Why in News:

An expert panel of the Union environment ministry has called for at least a 10-year-long study on whether fly ash disposal in mine voids leads to contamination of groundwater with heavy metals.

More about committee Recommendation:

  • Suggestion was made by the Expert Appraisal Committee (EAC) for thermal power and coal mining projects

  • The committee said the extensive research can be supported by funds provided by corporates that generate power and produce coal.

  • Panel requested the environment ministry to take necessary action to launch the programme under environment research division.

  • Panel noted that fly ash disposal in mine voids is not environmentally safe  andthe interface between the water and fly ash at the bottom of fly ash filled void results in leaching of heavy metals into groundwater system as evident by high levels of trace elements particularly heavy metals in ground water samples collected from sites located close to the ash filled voids

  • Panel expressed concern over reduction in recharging of groundwater due to fly ash filled mine voids.

  • The expert panel also noted that ash-filled voids cannot support tree species because of poor root system development which in turn results in uprooting of trees even by low velocity winds.

Concern of Fly Ash:

  • Fly ash is produced from the coal combustion process. It is usually used to fill mine voids. But in the past few years concerns have been raised over its environmental impact from several quarters

  • The National Green Tribunal, while hearing a case in 2015, asked India’s nodal pollution watchdog, the Central Pollution Control Board (CPCB), to form a committee to check if fly ash disposal in mine voids is leading to environmental degradation or damage in areas of Angul and Talcher in Odisha.

  • The CPCB committee had noted no significant higher concentration of heavy metals in groundwater due to filing of mine voids by fly ash. It had, however, called in for comprehensive monitoring of groundwater quality surrounding the ash disposal sites.

  • Millions of tonnes of fly ash is generated every year in India, prompting the environment ministry in 1999, 2003 and 2009 to issue directions for its proper use and disposal

  • fly ash disposal remains a major problem with only about 50-60% of the total fly ash generated by the power sector being utilised. Around 173 million tonnes of fly ash was produced across India in 2013-14

  • The remaining is dumped into poorly designed and maintained ash ponds. As per estimates, about a billion tonnes of this toxic ash lie dumped in these ponds, polluting land, air and water. By 2021-22, the thermal power sector is estimated to produce 300 million tonnes of fly ash a year and with that, utilisation of all the fly ash being generated is going to become even tougher.


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