Browsing by Author "Anjali, M.S."

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Assessment of ferrous slag with relevance to physico-chemical properties
(Springer, 2020) Anjali, M.S.; Poorani, M.; Shrihari, S.; Sunil, B.M.
Blast furnace slag is generated as a by-product in the production of iron. Large quantities of slag are visible in the industrial premises that can have adverse effects on the environment. To mitigate such problems, proper environmental management of slag is of great concern. In this regard, a qualitative and quantitative evaluation of ferrous slags such as crystallinity, surface morphology, and elemental composition were done using X-Ray Diffraction and Field Emission Scanning Electron Microscope with EDS (Energy Dispersive X-Ray Spectrometer), respectively. It is also characterized to determine heavy metals and functional groups using Atomic Absorption Spectroscopy and Fourier Transform Infrared Spectroscopy techniques for various geo-environmental applications. The nonplastic slag material showed 85–92% sand-size particles and 8–15% silt-size particles. The SiO2 and CaO values were found to be high followed by Al2O3, MgO, and other compounds. Since slag performed similarly to sand, it could be used as an alternative source of sand. © Springer Nature Singapore Pte Ltd. 2020.
Experimental studies of slag filter for drinking water treatment
(2019) Anjali, M.S.; Shrihari, S.; Sunil, B.M.
The study examined the use of granulated blast furnace slag, an industrial by-product from ferrous industries for drinking water treatment. A laboratory scale filter, 9 cm diameter and 40 cm with iron slag media supported on a gravel bed could completely remove turbidity, total suspended solids and colour for an average influent loading of 28.26 NTU, 128.85 mg/L and 177.05 PCU respectively at a filtration rate of 0.32 m3hr?1m?2. The average removal of hardness, sulphate, nitrate, chloride and iron were 35%, 83%, 71%, 28% and 94% for an average influent loading of 579.79 mgL?1, 367.72 mgL?1, 120.52 mgL?1, 355.67 mgL?1 and 1.49 mgL?1respectively. Doubling the filtration rate with slight increase in loading rate showed 100% removal for turbidity, suspended solids and colour whereas hardness, sulphate, nitrate, chloride and iron removals were 27%, 73%, 86%, 28% and 95% respectively. The maximum head loss for continuous operation without backwash was only 75 mm. Intermittent washing helped to improve the filtered water quality for various filtration and loading rates. An increase in the rate of filtration up to 1.28 m3hr?1m?2 did not have any impact on the quality of treated water except sulphate and nitrate. After backwashing, there was considerable improvement in chloride removal. The removal of physicochemical parameters was due to precipitation, adsorption and ion exchange with the formation of products both at the surface and within the slag media. FTIR and XRD results also confirmed the behaviour of slag as an anion exchange resin. The maximum head loss observed in slag filter was 190 mm at the highest loading level and filtration rate. 2019 Elsevier B.V.
Experimental studies of slag filter for drinking water treatment
(Elsevier B.V., 2019) Anjali, M.S.; Shrihari, S.; Sunil, B.M.
The study examined the use of granulated blast furnace slag, an industrial by-product from ferrous industries for drinking water treatment. A laboratory scale filter, 9 cm diameter and 40 cm with iron slag media supported on a gravel bed could completely remove turbidity, total suspended solids and colour for an average influent loading of 28.26 NTU, 128.85 mg/L and 177.05 PCU respectively at a filtration rate of 0.32 m3hr?1m?2. The average removal of hardness, sulphate, nitrate, chloride and iron were 35%, 83%, 71%, 28% and 94% for an average influent loading of 579.79 mgL?1, 367.72 mgL?1, 120.52 mgL?1, 355.67 mgL?1 and 1.49 mgL?1respectively. Doubling the filtration rate with slight increase in loading rate showed 100% removal for turbidity, suspended solids and colour whereas hardness, sulphate, nitrate, chloride and iron removals were 27%, 73%, 86%, 28% and 95% respectively. The maximum head loss for continuous operation without backwash was only 75 mm. Intermittent washing helped to improve the filtered water quality for various filtration and loading rates. An increase in the rate of filtration up to 1.28 m3hr?1m?2 did not have any impact on the quality of treated water except sulphate and nitrate. After backwashing, there was considerable improvement in chloride removal. The removal of physicochemical parameters was due to precipitation, adsorption and ion exchange with the formation of products both at the surface and within the slag media. FTIR and XRD results also confirmed the behaviour of slag as an anion exchange resin. The maximum head loss observed in slag filter was 190 mm at the highest loading level and filtration rate. © 2019 Elsevier B.V.