Supriya Sarkar - Academia.edu (original) (raw)

Papers by Supriya Sarkar

Ironmaking & Steelmaking, 2019

Linz-Donawitz (LD) or BOF (Basic Oxygen Furnace) Slag produced in the LD Process during steelmaki... more Linz-Donawitz (LD) or BOF (Basic Oxygen Furnace) Slag produced in the LD Process during steelmaking is one of the major threats to the steel producers worldwide. In general, BOF Slag undergoes physical separation to takeout the metallic portion and remaining non-metallic slag fine is dumped in open yard. This practice is becoming difficult in the present scenario due to the higher land cost and unavailability of land. Owing to the stability issue of steelmaking slag it's utilization in road making is very limited and only around 10% of production can be utilized in cement making due to high iron content. It is also used in the sinter making to recover iron value however, all these processes are not generating enough opportunities to utilize the entirety BOF slag generated from steel industries. The present article highlights the various conventional and non-conventional methods, till date, of utilization and value addition of BOF slag.

Metallurgical Research & Technology, 2019

The present research work has been conducted to remove gangue contents from rejects slime of iron... more The present research work has been conducted to remove gangue contents from rejects slime of iron ore, having particle size

Journal of Bioremediation & Biodegradation, 2018

Algae are a diverse group of photosynthetic organisms with profound bioremediation potential and ... more Algae are a diverse group of photosynthetic organisms with profound bioremediation potential and industrial applications that can reduce the cost of expenditure on energy and fuels. Algae have been applied to various applications from fuels and medicines to wastewater treatment. Potential applications of phycoremediation have instigated laboratories to reinforce the development of algal-based technologies for better exploitation of their bioremediation potential and by-product generation ability. Many species of algae have been studied and utilized for their function in wastewater treatment. Certain technological drawbacks need to be addressed to manage the shortcomings of algae for industrial usage. This review mainly focuses on the state of the art applications of phycotechnology for wastewater remediation. Many problems related to algal technology have also been exemplified and discussed such as contamination, decreasing the resilience time and increasing the biomass of the algal culture. Possible solutions of these bottlenecks have been suggested to better apply phycotechnology for wastewater remediation in industries considering the environmental issues. Recently, the concept of genetic engineering is found very useful that has increased the potential of phycotechnology reducing the resilience time considerably. On the contrary, the negative impact of the algal-based technologies on the environment and economy has also been deliberated in order to effectively utilize and manage this important organism with utmost benefit. Lastly, the review illuminates the scope and options of future research in the area of phycoremediation technologies.

Journal of Environmental Chemical Engineering, 2017

Feasibility study to assess the removal of Cr (VI) from mines wastewater using LD slag as reducin... more Feasibility study to assess the removal of Cr (VI) from mines wastewater using LD slag as reducing agent was conducted. Under the set treatment of slag size 0-6mm, stirring speed of 150rpm and reaction time of 60 minutes and with different solid liquid ratios the maximum 99.71% removal of Cr (VI) was achieved, meeting the CPCB norms (Central Pollution Control Board India). Mass balance of Cr (VI) in solid and liquid proves that the removal of Cr (VI) is due to its reduction into Cr (III) not because of its adsorption in slag. Redox reaction between Fe (II) present in LD slag and Cr (VI) present in wastewater was found to be the reason for removal of Cr (VI). Also 80.49% reduction in free lime content of LD slag was measured. Stabilization of LD slag was evident by conversion of free lime into bound lime as merwinite and gypsum through FTIR and XRD study. A significant increase in TDS of water was also observed. The mechanism of removal of Cr(VI) was described by using several successive steps. Removal of Cr(VI) by LD slag followed pseudo-second order kinetic model.

Green Energy and Technology, 2017

Carbon dioxide is the major greenhouse gas in the environment. Its largest contributor is fossil ... more Carbon dioxide is the major greenhouse gas in the environment. Its largest contributor is fossil fuel based industries and among them steel industry holds one of the vital positions. In view of global climate change agreements, there are efforts to reduce CO2 emission by development of suitable technologies. In last decades, various technologies have been developed to separate CO2 from the flue gas of power and industrial plants by using chemical or physical absorption, adsorption, cryogenic methods, membrane systems and biological fixation, etc. This paper elaborates on the aspects of different carbon capture processes and sequestration technologies developed and adopted by steel industries. In many cases, pilot scale studies have been completed successfully and are ready for implementation. Though, further development and fine tuning is required for commercialization of such processes.

International Journal of Phytoremediation, 2016

The wastewater at Sukinda chromite mines (SCM) area of Orissa (India) showed high levels of toxic... more The wastewater at Sukinda chromite mines (SCM) area of Orissa (India) showed high levels of toxic hexavalent chromium (Cr VI). Wastewater from chromium-contaminated mines exhibit potential threats for biotic community in the vicinity. The aim of the present investigation is to develop a suitable phytoremediation technology for the effective removal of toxic hexavalent chromium from mines wastewater. A water hyacinth species Eichhornia crassipes was chosen to remediate the problem of Cr (VI) pollution from wastewater. It has been observed that this plant was able to remove 99.5% Cr (VI) of the processed water of SCM in 15 days. This aquatic plant not only removed hexavalent Cr, but is also capable of reducing total dissolved solids (TDS), biological oxygen demand (BOD), chemical oxygen demand (COD), and other elements of water also. Large-scale experiment was also performed using 100 L of water from SCM and the same removal efficiency was achieved.

Water science and technology : a journal of the International Association on Water Pollution Research, 2018

Microbial desalination cell (MDC) is a propitious technology towards water desalination by utiliz... more Microbial desalination cell (MDC) is a propitious technology towards water desalination by utilizing wastewater as an energy source. In this study, a multi-chambered MDC was used to bioremediate steel plant wastewater using the same wastewater as a fuel for anodic bacteria. A pure culture of Pseudomonas putida MTCC 1194 was isolated and inoculated to remove toxic phenol. Three different inoculum conditions, namely P. putida (INC-A), a mixture of P. putida and activated sludge (INC-B), and activated sludge alone (INC-C) were employed in an anodic chamber to mainly compare the electricity generation and phenol degradation in MDCs. The study revealed the maximum phenol removal of 82 ± 2.4%, total dissolved solids (TDS) removal of 68 ± 1.5%, and power generation of 10.2 mW/m using INC-B. The synergistic interactions between microorganisms, can enhance the toxic phenol degradation and also electricity generation in MDC for onsite wastewater application.

Journal of Environmental Chemical Engineering, 2021

Abstract Rapid increase of atmospheric carbon dioxide (CO2) concentration has a potential effect ... more Abstract Rapid increase of atmospheric carbon dioxide (CO2) concentration has a potential effect on climate change. In this regard, carbon capture and storage (CCS) is recognized as having the potential to play a major role in the mitigation of CO2 and decarbonizing industry. The chemical separation based CO2 capture process is already established and adapted by several industries. However, the processes are energy intensive. Therefore, finding a potential adsorbent and their application towards CO2 capture is still a daunting task. Porous organic frameworks are a class of adsorbent material which can have huge potential in CO2 capture and short-term storage application because of their tremendously high surface area, chemical tunability, and surface functionality compared to other adsorbents, such as zeolites and activated carbon. In this review article, we provide a comprehensive account of significant progress in the design, synthesis, and scale-up processes of the porous organic frameworks and their application towards carbon capture and their engineering challenges.

International Journal of Environmental Analytical Chemistry, 2019

Flue dust from blast furnace is being regularly analysed in the Chemical Laboratory at Tata Steel... more Flue dust from blast furnace is being regularly analysed in the Chemical Laboratory at Tata Steel Plant at Jamshedpur. The analysis includes determination of carbon by combustion-infrared technique, loss on ignition (LOI) at 1000°C and analysis of other constituents such as iron oxide (Fe 2 O 3), lime (CaO), silica (SiO 2), phosphorus (P), alumina (Al 2 O 3), magnesium oxide (MgO) and manganese oxide (MnO). The period for determination of carbon and other constituents is usually around 15-20 min, whereas LOI determination takes about 2 h, thus creating an unavoidable delay in reporting the results to the customer. The present study provides an interesting scientific solution to avoid this delay by establishing a strong linear correlation between carbon (≈6.96-45%) and LOI (≈ 4.0-52.0%) values. The study also indicates that the carbon in the flue dust is from the carbonaceous matter fed to the furnace and not due to the fluxes introduced in the furnace during the charging because no correlation was observed between the carbon values and CaO, MgO values of flue dust. This correlation obtained is further proved with the help of characterisation techniques such as X-ray diffraction (XRD), Fourier transform infrared analysis (FTIR) and Raman analysis.

Journal of Water Process Engineering, 2019

Cyanide contamination in steel industry wastewater is a long-standing environmental problem. The ... more Cyanide contamination in steel industry wastewater is a long-standing environmental problem. The present work demonstrates the usability of coke breeze, a carbon rich by-product of steel industry for successful adsorption of free cyanide from the wastewater. The coke breeze was characterized by scanning electron microscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Elemental analysis by energy dispersive Xray clearly showed the presence of elemental nitrogen after adsorption of cyanide. XRD and FTIR analyses confirmed the cyanide adsorption on coke breeze matrix. pH zpc of the adsorbent was found to be 7.4. Maximum Langmuir adsorption capacity of coke breeze for cyanide was 12.3 mg/g at pH 7 and 298 K. Adsorption kinetics revealed that cyanide concentration was reduced rapidly in initial two hours and slowly thereafter. Continuous column experiments were conducted to observe the scalability of the process using real life steel plant wastewater. First principle based pore diffusion model was used to quantify the performance of continuous column experiments and relevant model parameters were estimated. Using these parameters a complete scale up study was undertaken for treatment of actual steel plant wastewater.

Metallurgical Research & Technology, 2018

The main constituents of LD Slag fines in the size range of 0–6 mm after recovering the metallic ... more The main constituents of LD Slag fines in the size range of 0–6 mm after recovering the metallic iron in a waste recycling plant (WRP) mainly contains calcium bearing mineral phases such as mono, di and tricalcium silicates along with free lime. The chemical constituents are CaO, SiO2, FeO and Al2O3 with traces of chromium, manganese, etc., as oxides. The WRP waste, i.e., LD Slag fines of 0–6 mm is further subjected to sieving mainly into three different size fractions viz. + 10 mesh (−6.0 + 2.0 mm), + 60 mesh (−2.0 + 0.25 mm), −60 mesh (−0.25 mm) for studying its possible application economically in different sectors such as agriculture, construction and chemical industries. Chemical and XRD analysis indicate high lime content along with some compounds like calcite, silicates of calcium, brownmillerite and dicalcium diferrate, etc., in these slag samples. FTIR analysis of these size fractions also indicates the presence of hydrated silicates, calcite and anhydrous calcium silicate....

Advanced Materials Research, 2015

A new technology called microbial desalination cell (MDC) approaches a comprehensive way to desig... more A new technology called microbial desalination cell (MDC) approaches a comprehensive way to design an innovative system for removal of organic matter and dissolved solids from wastewater. In this study, two laboratory scale MDCs having three chambered (3C-MDC) and five chambered (5C-MDC) configuration were developed for integrated biodegradation of steel plant wastewater. The 3C-MDC have anodic, middle desalination and cathodic chamber; while 5C-MDC have anodic, cathodic, middle desalination and two concentrate chambers separated by ion exchange membranes. Using synthetic saline water with 8 and 30 g/L of TDS and steel plant wastewater (3.74 g TDS/L) in desalination chamber, the TDS removal of 64 ± 2.3%, 75 ± 1.8%, and 58 ± 1.3% were observed in 3C-MDC, while in 5C-MDC, those were 58 ± 1.5%, 71 ± 2.1%, and 64 ± 2.4%, respectively in 96 h of fed batch operation. With 30 g/L of TDS concentration, the power generation observed in 3C-MDC and 5C-MDCs were (81 mW/m2 and 78 mW/m2) higher t...

Journal of Environmental Chemical Engineering, 2016

Highlights  Effluent was treated to reduce total solid, ion-concentration and salinity.  Charge... more Highlights  Effluent was treated to reduce total solid, ion-concentration and salinity.  Charged membrane rejects ions through charge-charge repulsion.  Enhancement in transmembrane pressure and cross flow rate reduces rejection.

International Journal of Phytoremediation, 2014

An eco-friendly and cost effective technique- phytoremediation was used to remediate contaminants... more An eco-friendly and cost effective technique- phytoremediation was used to remediate contaminants from waste water. This study demonstrated that phytoremediation ability of duckweed (Lemna minor L.) to remove chloride, sulphate from Biological Oxygen Treatment (BOT) waste water of coke oven plant. The BOT water quality was assessed by analyzing physico-biochemical characters - pH, Biological oxygen demand (BOD), Chemical oxygen demand (COD), total dissolved solids (TDS) and elemental concentration. It was observed that an increase in pH value indicated an improvement of water quality. The experimental results showed that, duckweed effectively removed 30% chloride, 16% sulphate and 14% TDS from BOT waste water, which suggested its ability in phytoremediation for removal of chloride and sulphate from BOT waste water. A maximum increase of 30% relative growth rate of duckweed was achieved after 21 days of experiment. Thus, it was concluded that duckweed, an aquatic plant, can be considered for treatment of the effluent discharged from the coke oven plant.