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- 저자 : Bandana Das (검색결과 2 건)
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Separation of oil from oily wastewater using low cost ceramic membrane
Bipul Das,Bandana Chakrabarty,Pranab Barkakati 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.10
Safe disposal of oily wastewater is a global issue across the industrial world. Stable oil-in-water emulsion has been separated by dead end filtration using low cost ceramic membrane. The efficiency of separation at different oilwater emulsion concentrations was evaluated at different trans-membrane pressures. Maximum rejection of oil 95.4% was observed for membrane sintered at 850 oC for oil concentration of 250mg/L at 137.89 kPa. The permeate oil concentration was within the permissible range of environmental tolerance (<12mg/L). The flux decline data was compared with various pore blocking models and it was appraised that cake filtration model best represents the fouling mechanism within the experimental range of pressure and oil-in-water concentration. Solvent permeation studies revealed that nonpolar solvents were more permeable than the polar solvents. The selection parameter of 14.78×10−6m3/ m2·s indicates a good combination of flux permeation, declination and rejection for the membrane sintered at 900 oC.
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Balasubramanaian Thilagavathi,Bandana Das,Ayyappan Saravanakumar,Kuzhanthaivel Raja 한국해양과학기술원 2011 Ocean science journal Vol.46 No.2
The ecological aspects of meiofaunal communities in the Muthupettai mangrove forest, East coast of India, has not been investigated in the last two decades. Surface water temperature ranged from 23.5 ^oC to 31.8 ^oC. Salinity varied from 24 to 34 ppt, while water pH fluctuated from 7.4 to 8.3. Dissolved oxygen concentration ranged from 3.86 to 5.33 mg/l. Meiofauna analysis in this study identified a total of 106 species from the mangrove and adjacent open sea area of Sethukuda. Among these, 56 species of foraminiferans, 20 species of nematodes, 7 species of harpacticoid copepods, 4 species of ostrocodes, and 2 species of rotifers were identified. Furthermore, a single species was identified from the following groups: ciliophora, cnidaria, gnathostomulida, insecta, propulida, bryozoa and polychaete larvae. Meiofaunal density varied between 12029 to 23493 individuals 10 cm/m2. The diversity index ranged from 3.515 to 3.680, species richness index varied from 6.384 to 8.497, and evenness index varied from 0.839 to 0876 in the mangrove area and adjacent open sea.
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