12-14 September, 2011, Lucknow - Earth Science India

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National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow SUSTAINABLE CLOSURE PLAN OF JHARIA COALFIELDS Biswajit Paul Centre of Mining Environment, Department of Environmental Science and Engineering, Indian School of Mines, Dhanbad, Jharkhand email: dr_bpaul@yahoo.com There are about 70 coalfields in India ranging in areal extent from a few square kilometers to several hundred square kilometers, producing more than 500MT of coal per annum. Mine Closure Plan is scheduling to stop the mining operations after it becomes uneconomical, exhausted of its mineral resources or it is technically not feasible for mining. The planning should cover the post mining land use, safety and favorable environmental condition for the inhabitants nearby. This paper discusses author’s conceptual ‘closure plan’ of Jharia coalfield where mining started more than two century ago and will continue for two more centuries more with the current production rate of 30MT per year. There are 49 overlapping coal seams of various thickness, unapproachable old mine working, ravaging mine fire, numerous environmental problems and highly populated surface along with important infrastructures like townships, national highways, railways, aerial ropeways, etc. Geological study, seam orientation, geographical boundaries, method of working and closure legislations were studied to establish closure plan for different areas/geological measures of the coalfields. The outcome of the study will enable the mine executives to take appropriate steps during the present mining operations to achieve sustainable mine closer and post mining environmental management in Jharia and other coalfields also. LEACHING STUDY OF SELECTED TRACE ELEMENTS FROM COAL FLY ASH R.K. Singh 1 , N.C. Gupta 1 and B.K. Guha 2 1 University School of Environment Management, GGS Indraprastha University, New Delhi 2 Department of Chemical Engineering, I. I. T. Delhi, Hauz Khas, New Delhi Thermal power plants produce large amount of fly ash during the combustion of coal. Fly ash is the noncombustible mineral matter in coal which is thermally altered as it cycles through the combustion process. In recent years a significant amount of fly ash is being utilized in construction, building engineering, road, back filling and in agriculture. The leaching of coal fly ash 50
National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow during the disposal from the plant is of great concern for potential contamination of soil, surface water and ground water. The unmanaged fly ash disposal may result in significant problems for ecology and environment. The leaching of fly ash during disposal is of concern for possible contamination, especially for aquatic environment when ash is in direct contact with water. In the present study, laboratory leaching tests have been conducted to determine the potential mobility of elements like Fe, Cu, Cr, Pb, Ni and Cd from fly ash samples. Batch leaching experiments have been carried out to determine the leaching characteristics of trace elements from coal fly ash obtained from Rajghat Power House located in Delhi. The shake test was performed as per the American Society of Testing Materials (ASTM) method using an agitation device designed to rotate about a central axis at the rate of 100 rpm with an L/S ratio of 20:1, using 12.5 gm dried fly ash in 250ml of extraction solutions over varying periods of leaching. The leachates obtained analyzed for selected trace elements. The results for leachates indicate that there is no regular pattern of leaching of trace elements. Among the trace metal originally present in fly ash, Pb and Cd occur, at very minor concentrations in the leachates obtained over the different intervals. The other elements such as Fe, Ni, Cu and Cr which were detectable in the leachates show their presence. The agitation time influenced the pH and the concentration of different elements leached into the solution, since different phases are dissolved at different rate. GOMTI RIVER: FIGHTING FOR ITS EXISTENCE Sarika Shukla 1* and Sugandha Shanker 2 1 I.T.P.G. College, Lucknow. 2 Lucknow University, Lucknow *email: shuklasarika11@yahoo.co.in There is no dearth of statistics and data claiming the alarming rate at which earth’s water resources are being depleted, polluted and rendered unpotable. As rivers shrink, man has not become any wiser which is proven by the fact that pollution rates have sky rocketed in the past decades. By the year 2025, 2/3 of the world’s population will be facing water shortage. According to UN surveyed reports, India is expected to face critical levels of water stress by 2025 and there will be serious water shortages. The dynamics of fresh water depletion not only holds true for the world and our own country but also for our state of Uttar Pradesh where Lucknow city itself is an example of how a township is subjected to such hydrological stress. Disappearing and drying up of water bodies has resulted in the lack of availability of surface water. This scenario has made us dependent on the ground water which is not being replenished as infiltration of rain water into the ground has decreased due to concrete landscape. 51
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12-14 September, 2011, Lucknow - Earth Science India

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