Ritusmita Goswami
Tezpur University
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Featured researches published by Ritusmita Goswami.
Bioresource Technology | 2017
Neonjyoti Bordoloi; Ritusmita Goswami; Manish Kumar; Rupam Kataki
The present investigation deals with the utilization of biochar derived from the pyrolysis of microalgae Scenedesmus dimorphus as an adsorbent for the removal of cobalt (II) ion (Co) from aqueous solution. A series of experiments were conducted in a batch system to evaluate the performance of the biochar for Co removal. The effect of contact time on adsorption of Co (II) onto surface of the biochar was investigated. The equilibrium sorption data were analyzed by using Langmuir, Freundlich, Temkin, Harkins-Jura and Dubinin-Radushkevich (D-R) isotherms and were found to be adequate in describing the Co adsorption onto the biochar. Equilibrium data were well fitted for Freundlich, Temkin and D-R isotherms. The kinetic study of Co (II) adsorption on microalgae biochar were described by applying pseudo-first-order and pseudo-second-order rate equations. The surface of adsorbent before and after the removal of Co (II) was characterized by using SEM, EDX and XRD analysis.
Chemosphere | 2016
Manish Kumar; Aparna Das; Nilotpal Das; Ritusmita Goswami; Umesh Kumar Singh
Considerable lacunae exists in As and F(-) co-contamination investigation in the Brahmaputra and Gangetic floodplains. Therefore we selected Diphu a township in the Karbi Plateau rising from the Brahmaputra floodplains for evaluation of As and F co-occurrence, correlation with coexisting ions of the aquifer system and elucidation of potential processes for releasing As and F(-) in the groundwater. Our initial appraisal used generic plots for identification of hydro geochemical processes and major water types. Subsequently, As and F(-) co-occurrence with pH, depth, HCO3(-), SO4(2-), Ca(2+) and Fe were probed for possible correlation followed by hierarchical cluster analyses to identify key processes for co-occurrence. Finally, saturation indices of groundwater minerals were calculated using MINTEQA2 to elucidate prospective As and F(-) release into groundwater. Results indicate F(-) and As presence in Ca-HCO3 rich water along with positive correlation between Ca(2+) and F(-) possibly due to limestone reserves in adjoining areas. Multivariate analyses suggest the presence of high concentrations of PO4(3-), and H4SiO4 either individually or in combination can enhance the mobility of both As and F(-) and possibly abet conditions conducive for co-contamination of aquifers. Initial release of As and F(-) from the parent rock seems driven by the anthropogenic activities while mobilization depends on chemical interactions and individual affinities of the elements. The results of speciation highlight further mobilization of As and F(-) into the groundwater which in turn require regular attention for sustainable management of scarce water resource present in the area.
Bioresource Technology | 2017
Debajeet Gogoi; Neonjyoti Bordoloi; Ritusmita Goswami; Rumi Narzari; Ruprekha Saikia; Debashis Sut; Lina Gogoi; Rupam Kataki
In the present study, arecanut husk, an agro-processing waste of areca plam industry highly prevalent in the north-eastern region of India, was investigated for its suitability as a prospective bioenergy feedstock for thermo-chemical conversion. Pretreatment of areca husk using torrefaction was performed in a fixed bed reactor with varying reaction temperature (200, 225, 250 and 275°C). The torrefied areca husk was subsequently pyrolyzed from temperature range of 300-600°C with heating rate of 40°C/min to obtain biooil and biochar. The torrefied areca husk, pyrolysis products were characterized by using different techniques. The energy and mass yield of torrefied biomass were found to be decreased with an increase in the torrefaction temperature. Further, biochar were found to be effective in removal of As (V) from aqueous solutions but efficiency of removal was better in case of torrefied biochar. Chemical composition of bio-oil is also influenced by torrefaction process.
Environmental Geochemistry and Health | 2017
Manish Kumar; Arbind Kumar Patel; Aparna Das; Pankaj Kumar; Ritusmita Goswami; Parismita Deka; Nilotpal Das
Abstract In recent years, elevated concentration of arsenic (As) in groundwater in the northeastern states of India has become a major cause of concern. Since many regions of the Brahmaputra plains are reported with groundwater As contamination, an attempt was made to study the As contamination and factors governing its release in the Nagaon district in Brahmaputra floodplain, based on various water types, relation of As with other major ions and with various depth profiles. The origin of groundwater mineralization and the processes responsible for As enrichment in groundwater was determined by calculating saturation index using PHREEQC code. Multivariate statistical analysis was carried out for identification of As-releasing mechanism based on rock–water interaction. Principle component analysis of physicochemical parameters revealed the association of As with SiO2 and Cl− in pre-monsoon and the fact that alkaline condition favors release of As. The relation between As and Fe shows that reductive dissolution of solid Fe oxide and hydroxide phases could be the source of As in Nagaon district. The result of hierarchical cluster analysis indicates that As release could also be associated with the agrochemicals application. Health risk assessment revealed that children are more susceptible to carcinogenic as well as non-carcinogenic health impact with consumption of As-contaminated drinking water. The male population is more susceptible to cancer as compared to females as the average water consumption is higher in case of male. Overall, the study highlights the health risk assessment is a matter of chief concern in this study as the younger generation are at higher risk.
Ecotoxicology and Environmental Safety | 2018
Rinkumoni Borah; Deepa Kumari; Anindita Gogoi; Sunayana Biswas; Ritusmita Goswami; Jaehong Shim; Naznin Ara Begum; Manish Kumar
Burmese Grape Leaf Extract (BGLE), a low cost adsorbent was studied for cadmium (Cd(II)) removal from metal solutions and natural water samples. Batch adsorption studies were carried out to examine the influence of contact time and initial metal concentration after characterization under scanning electron microscopy (SEM). Cd(II)adsorptiononto BGLE was best explained by pseudo-second order kinetics (R2 = 0.99) and best fitted with Langmuir isotherm model (R2 = 0.76). Beside the selective adsorption activity of BGLE towards Cd(II), only 0.1g of BGLE have shown effective adsorption of these ions with a maximum adsorption capacity (qm) of 44.72mgg-1. This study was a unique combination of laboratory experiments and field implication. Study indicates that same efficacy cannot be obtained in natural water samples as obtained in the case of laboratory due to the interference of major ions in water.
Archive | 2015
Nilotpal Das; Latu Khanikar; Rajesh Shah; Aparna Das; Ritusmita Goswami; Manish Kumar; Kali Prasad Sarma
The problem of naturally occurring As pollution in groundwater is a burning issue which has now been recognised as one of the greatest environmental hazards, threatening the lives of the millions across the globe (Nickson R, McArthur JM, Burgess W, Ahmed KM, Ravenscroft P, Rahman M, Nature 395:338, 1998, Nickson RT, McArthur JM, Ravenscroft P, Burgess WG, Ahmed KM, Appl Geochem 15(4):403–413, 2000; Smith AH, Lingas EO, Rahman M, Bull World Health Organ 78(9):1093–1103, 2000; Berg M, Tran HC, Nguyen TC, Pham HV, Schertenlrib R, Giger W (2001), Environ Sci Technol 35:2621–2626, 2001; Anawar HM, Akai J, Mostofa KMG, Safiullah S, Tareq SM, Environ Int 27:597-604, 2002; Smedley PL, Kinniburgh DG, Appl Geochem 17(5):517–568, 2002; Guo HM, Wang YX, Shpeizer GM, Yan SL, J Toxicol Environ Health Part A, Environ Sci Eng Toxic Hazard Subst Control 38:2565–2580, 2003; Ravenscroft P, Burgess GW, Ahmed KM, Burren M, Perrin J, Hydrogeol J 13:727–751, 2003; Smedley PL, Zhang M, Zhang G, Luo Z, Appl Geochem 18(9):1453–1477, 2003; Li J, Wang Z, Cheng X, Wang S, Jia Q, Han L et al, Chin J Endem 24:183–185, 2005; Polya DA, Gault AG, Diebe N, Feldman P, Rosenboom JW, Gilligan E et al, Mineral Mag 69:807–823, 2005; Anawar HM, Akai J, Yoshioka T, Konohira E, Lee JY, Fukuhara H, Tari Kul Alam M, Garcia Sanchez A, Environ Geochem Health 28:553–565, 2006; Enmark G, Nordborg D, Arsenic in the groundwater of the Brahmaputra floodplains, Assam, India – Source, distribution and release mechanisms. Committee of Tropical Ecology ISSN 1653–5634 minor field study 131. Uppsala University, Sweden, 2001; Nriagu et al. Arsenic in soil and groundwater: an introduction. In: Bhattacharya P, Mukherjee AB, Bundschuh J, Zevenhoven R, Loeppert RH (eds), Arsenic in soil and groundwater environment: biogeochemical interactions, health effects and remediation, trace metals and other contaminants in the environment, vol 9, (Ser ed Nriagu JO). Elsevier, Amsterdam, 2007; Kumar M, Kumar P, Ramanathan AL, Bhattacharya P, Thunvik R, Singh UK, Tsujimura M, Sracek O, J Geochem Explor 105:83–94, 2010a, Kumar P, Kumar M, Ramanathan AL, Tsujimura M, Environ Geochem Health 32:129–146, 2010b; Bundschuh J, Litter MI, Parvez F, Roman-Ross G, Nicolli Hugo B, Jean J-S, Liu C-W, Maria Dina L, Armienta A, Guilherme Luiz RG, Cuevas AG, Cornejo L, Cumbal L, Toujaguez R, One century of arsenic exposure in Latin America: a review of history and occurrence from 14 countries, 429:2–35, 2012). Long-term ingestion of drinking water having As concentration beyond the permissible limit of 50 μg/L leads to detrimental effects on human health. Epidemiological studies have shown that inorganic As is a serious toxicant and can cause a variety of adverse health effects, such as dermal changes, respiratory, pulmonary, cardiovascular, gastrointestinal, haematological, hepatic, renal, neurological, developmental, reproductive, immunologic lead to cancer and other degenerative effects of the circulatory and nervous system (Golub MS, Macintosh MS, Baumrind N, J Toxicol Environ Health Part B 1(3):199-241, 1998; Lin T-H, Huang Y-L, Wang M-Y, J Toxicol Environ Health 53:85–93, 1998; NRC 2001; Ahamed S, Kumar Sengupta M, Mukherjee A, Amir HM, Das B, Nayak B, Pal A, Mukherjee CS, Pati S, Nath DR, Chatterjee G, Mukherjee A, Srivastava R, Chakraborti D, Sci Total Environ 370(2–3):310–322, 2006). In view of the above perspective WHO in 1993 has lowered its earlier permissible limit of 50 μg/L in drinking water to 10 μg/L. The BIS has also endorsed 10 μg/L as the permissible limit for As in drinking water.
Journal of Hazardous Materials | 2019
Jaehong Shim; Manish Kumar; Ritusmita Goswami; Payal Mazumder; Byung-Taek Oh; Patrick J. Shea
For sustainable production, there is an urgent need to minimize the adverse environmental impacts of swine farming, which is a major contributor of the pollutants p-cresol and tylosin. Novel reactive composite alginate beads (CAB-MOACs) were fabricated by combining alginate with activated carbon (AC) and MnO2 recovered from spent battery waste and used for efficient removal of p-cresol and tylosin from water. Batch experiments were carried out under varying pH (3-11), temperature (15-50 °C), and agitation speed (50-200 rpm) to understand their effects on removal efficiency. The CAB-MOACs had better removal efficiency for p-cresol and tylosin than alginate beads alone or beads containing only AC or MnO2. Adsorption to CAB-MOACs followed pseudo-second-order kinetics (R2≥0.98) and Langmuir isotherm models (R2≥0.95). CAB-MOACs showed higher removal efficiency (∼99.9% after 10 h) compared to beads containing only immobilized MnO2 (60-70%) or AC (94-96%). Regeneration and reuse performance of the CAB-MOACs was excellent through five cycles, although slightly better for p-cresol than tylosin. With low-cost manufacturing and beneficial utilization of hazardous waste such as spent batteries, the newly developed composite beads show potential as an effective adsorbent for treating wastewater effluent containing emerging contaminants like p-cresol and tylosin. Future studies may focus on product refinement and large-scale testing on actual wastewaters.
Ecological Engineering | 2016
Ritusmita Goswami; Jaehong Shim; Shantanu Deka; Deepa Kumari; Rupam Kataki; Manish Kumar
Chemosphere | 2016
Manish Kumar; Nilotpal Das; Ritusmita Goswami; Kali Prasad Sarma; Prosun Bhattacharya; A. L. Ramanathan
Journal of environmental chemical engineering | 2017
Ruprekha Saikia; Ritusmita Goswami; Neonjyoti Bordoloi; Kula Kamal Senapati; Kamal K. Pant; Manish Kumar; Rupam Kataki