Browsing by Author "Ankita Rai"

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Study of Hydrocarbon Source Potential of Kapurdi Lignites of Barmer Basin, Rajasthan, Western India
(Springer, 2021) P.K. Rajak; V.K. Singh; Aniruddha Kumar; Vishvajeet Singh; Ankita Rai; Shweta Rai; K.N. Singh; Mamta Sharma; A.S. Naik; Neeraj Mathur; Prakash K. Singh
The present investigation is an attempt to study hydrocarbon source potential of early Paleogene lignites of Kapurdi, Barmer Basin. The samples collected from the working mines have been subjected to petrographic and geochemical analyses. The petrographic study includes both maceral as well as microlithotype analyses whereas geochemical study includes proximate and ultimate analyses. Besides, rock eval pyrolysis, FTIR and NMR studies have also been carried out. The analytically generated data were also correlated and checked with empirical equations. The study shows that these lignites of Barmer Basin are rich in kerogen type-III organic matter and contain high concentration of reactive macerals (huminite + liptinite) to the tune of ∼98% (mineral matter free basis) and they have attained low maturity (Rmax is 0.43%). These lignites have a fairly high conversion factor (95–97%) and oil yield (65–67%) which is also supported by the rock-eval data. Further, 1H and C13 shifts of NMR also suggest a high potential of hydrocarbon of Kapurdi lignites. © 2021, GEOL. SOC. INDIA.
Study of Micro-structures and their Relation with Occurrence of Mineral Matter in Ramagundam Coals, Godavari Basin, India: Implications on Coal and Hydrocarbon Industries
(Springer, 2022) Shweta Rai; Ankita Rai; Kajal Kumar; Amiya S. Naik; Neelratan Singh; D.K. Srivastava; Prakash K. Singh
This paper is an attempt to study the relationship between coal microstructures and mineral matter in Ramagundam Gondwana coal of Godavari basin. For this purpose, the occurrence and distribution of mineral matter in different lithotypes and microlithotypes have been investigated and their association with organic matter has been studied. The work has been accomplished through detailed petrography, SEM-EDS and XRD studies. Presence of clay minerals and pyrite, along with trace amounts of apatite, ankerite, hematite, calcite, dolomite and quartz has been revealed from the study. The lithotypes and bands have variable concentrations of mineral matter which occurs associated with different microstructures in coal. Optical microscopy reveals that mineral matter occurs maximum in dull-coal but it is almost equally distributed in dull-banded coal and banded-bright coal. The study also incorporates the nature of fracture and phyteral pores and their association with mineral matter. Vitrain is characterized by cleats, micropores and microfractures which are often filled up partially or completely with mineral matter; fusain has well preserved tracheids with open pits and partially homogenized cell structure filled with mineral matter. In durain and clarain lithotypes, the minerals are intimately intergrown with the organic constituents. © 2022, Geological Society of India, Bengaluru, India.
Study of minerals and selected environmentally sensitive elements in Kapurdi lignites of Barmer Basin, Rajasthan, western India: implications to environment
(Korean Association of Geoscience Societies, 2020) Pramod K. Rajak; Vijay K. Singh; Asha L. Singh; Narendra Kumar; Om P. Kumar; Vishvajeet Singh; Aniruddha Kumar; Ankita Rai; Shweta Rai; Amiya S. Naik; Prakash K. Singh
The present study is an attempt to know the temporal and spatial distribution of geochemical components in the lignite deposit of Kapurdi, Barmer Basin (Rajasthan). Lignite samples have been subjected to proximate, ultimate and elemental analyses, and determination of mineral carbon (MINC%). Besides, various minerals and functional groups have been analyzed through X-ray diffraction (XRD) and Fourier transforms infrared spectroscopy (FTIR). Selected environmentally sensitive and potential hazardous elements like Cu, Cd, Zn, Ni, Cr, Pb, Mn, Al, Fe and Co are determined using atomic absorption spectrophotometer (AAS). To know the association of minerals with organic matter, scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) has also been carried out. The concentration of Co, Ni, Cd, Pb, Na, and K is high when compared with world average and is main concern for the environmental and health hazards. The elements like Fe, Ca, Mg, Zn, and Pb have shown increasing trend from top to bottom of the lignite seam with some fluctuations in the values in few bands whereas others do not follow a definite trend of variation along the seam profile. © 2019, The Association of Korean Geoscience Societies and Springer.
Use of bacteria and synthetic zeolites in remediation of soil and water polluted with superhigh-organic-sulfur Raša coal (Raša Bay, North Adriatic, Croatia)
(MDPI AG, 2019) Gordana Medunić; Prakash Kumar Singh; Asha Lata Singh; Ankita Rai; Shweta Rai; Manoj Kumar Jaiswal; Zoran Obrenović; Zoran Petković; Magdalena Janeš
The Raša Bay (North Adriatic, Croatia) has been receiving various pollutants by inflowing streams laden with untreated municipal and coalmine effluents for decades. The locality was a regional center of coalmining (Raša coal), coal combustion, and metal processing industries for more than two centuries. As local soil and stream water were found to be contaminated with sulfur and potentially toxic trace elements (PTEs) as a consequence of weathering of Raša coal and its waste, some clean-up measures are highly required. Therefore, the aim of this study was to test the remediating potential of selected microorganisms and synthetic zeolites in the case of soil and coal-mine water, respectively, for the first time. By employing bacterial cultures of Ralstonia sp., we examined removal of sulfur and selected PTEs (As, Ba, Co, Cr, Cu, Ni, Pb, Rb, Se, Sr, U, V, and Zn) from soil. The removal of sulfur was up to 60%, arsenic up to 80%, while Se, Ba, and V up to 60%, and U up to 20%. By applying synthetic zeolites on water from the Raša coalmine and a local stream, the significant removal values were found for Sr (up to 99.9%) and Ba (up to 99.2%) only. Removal values were quite irregular (insignificant) in the cases of Fe, Ni, Zn, and Se, which were up to 80%, 50%, 30%, and 20%, respectively. Although promising, the results call for further research on this topic. © 2019 by the authors.