Management of Ash Generated by Power Plants
Central Electricity Authority (CEA) has informed that out of total ash produced in coal based power plants 55.79% was utilized during the year 2010-11. During the period April, 2011 to September, 2011 the ash utilization was 54.53%.
Water quantity of 4 to 5 times the ash is required for disposal of ash. This water is generally taken from used water from other station facilities like cooling tower blow down etc. As per existing guidelines of Ministry of Environment & Forests, decanted water from ash pond is re-circulated and utilized within the plant for various uses.
No report of release of these elements to the environment has been brought to the notice of CEA. Moreover, Ministry of Environment & Forests stipulates lining of ash ponds at the time of environmental clearance of coal/ lignite based thermal power projects so as to ensure that ash water does not percolate and get mixed up with ground water.
Allocation of water to the new coal/ lignite based thermal power plants is done by the concerned State Government keeping in view other requirements such as drinking and irrigation etc.
This information was given by the Minister of State for Power Shri K.C.Venugopal in a written reply to a question in Rajya Sabha today.