International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 05 | May 2022
p-ISSN: 2395-0072
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Assessment and Management of Abandoned Coal Mine to Neutralize Acid Mine Drainage Huzaifa Sufiyan Siddiqui 1Student, Dept. of Mining Engineering, C.T.A.E (M.P.U.A.T.), Rajasthan, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - One of the most significant water risks posed by
technical availability and the mines economic viability, characterization of coalmine wastes for backfilling in mines is crucial. The long-term impact of overburden mixed fly ash dumping on water quality in mining zones must also be considered in order to develop appropriate corrective measures.
mining is acid mine drainage. A mine draining acid may wreak havoc on rivers, streams, and aquatic life for hundreds, if not thousands, of years. It might simply be compared to the wellknown air pollution problem. Acid rain is a pollution-related issue. Acid rain is caused by atmospheric SO2 interacting with water. Sulfuric acid is made from H2O. Similarly, when sulphur is present in the form of sulphide minerals in rocks, When sulfuric acid is freed and oxidised, it produces sulfuric acid. A case study (Gorbi abandoned mine NCL Singrauli coalfield) was conducted for this thesis. Evaluation and control of corrosive mine water in an abandoned mine hole filled with water that is acidic has been explored. Examining the acid neutralization capabilities of fly ash and O/B for acid water treatment as well as other water quality metrics such as TDS and PH using fly ash, waste rock materials, and acidic water collected in the field. Due to the constraints imposed by Covid19, I ran a few tests at home, based mostly on a literature analysis of numerous research, to establish the best probable strategy for acid water regulation. The findings are positive, indicating that both fly ash and overburden (sandstone) have high neutralisation potential that might be effective for efficiently neutralizing mine acid water.
1.1 Acid Mine Drainage Before AMD is the product of atmospheric (i.e., water, oxygen, and carbon dioxide) oxidation of relatively common iron-sulfur minerals like pyrite (FeS2) and pyrrhotite (FeS) in the catalysing presence of Acidithiobacillus ferrooxidans, an acidophilic bacterium, as well as the other products generated as a result of those oxidation reactions. Contaminated drinks, disturbed development and reproduction of aquatic plants and animals, and consequently the acid's corrosive effects on infrastructure components such as bridges are all problems linked with mine drainage. Traditional AMD therapies include a number of physicochemical approaches. Biological therapy for AMD has emerged as a viable, cost-effective, and ecologically friendly approach. The bulk of these techniques rely on microorganisms like bacteria and fungus to perform passive cleanup. Microbial bioreactors and wetlands
Key Words: Acid Mine Drainage, Fly Ash, Neutralization
Metals and sulphates are reduced, and 14 alkalinity is produced, which helps to minimise AMD. Biotechnological methods can aid in the development of ways for efficiently treating wastes like AMD without jeopardizing environmental sustainability. Acidity, ferric ion (Fe3+) precipitation, oxygen depletion, and the discharge of heavy metals from coal and metal mining, such as aluminium (Al3+), zinc (Zn2+), and manganese (Mn2+), have all had an influence on stream and river ecosystems. Acid mine drainage must be able to feed sulfide-containing mineral resources when they are exploited. Coal, copper, gold, silver, zinc, lead, and uranium mining are all examples of this. Pyrite, popularly known as "fool's gold," is a sulphide mineral (FeS2). One of the most significant sulphides found in mine waste rock is pyrite. When exposed to water and oxygen, it can form vitriol (H2SO4).
1. INTRODUCTION Due to a prolonged investment programme and a higher emphasis on the utilisation of current technologies, Coal India Limited was able to boost coal output in India to 730.87 million tonnes in 2019-20. In 2020-21, India's total coal mining production was 716.01 million tonnes, a negative growth rate of -2.03 percent. The main coal producers in India are Coal India Limited (CIL) and its subsidiaries. India is the world's third largest producer of electricity and third greatest user. As of May 31, 2021, India's national electric grid has an installed capacity of 383.37 Gigawatt. Renewable energy plants, including big hydropower plants, account for 37% of India's total installed capacity. The disposal and treatment of mine water during and after the closing of open cast mines is one of the primary difficulties that the coal mining industry is now experiencing. Surface water pollution by acid has wreaked havoc on the ecology in and around coal mining sites (Jamal et al., 2008). The huge amount of water and the presence of leachates hamper water reuse, necessitating long-term management and treatment. For environmental and safety considerations,
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1.2 Fly Ash Many pithead thermal power plants utilise ash to restore abandoned coal pit voids. is frequently this is one of the sites where a considerable volume of ash produced by pithead and distantly located power plants may be used on a lengthy
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