02647nas a2200265 4500008004100000022001400041245012000055210006900175260000900244300001200253490000800265520177000273653001502043653001702058653001302075653001402088653002502102100001602127700002402143700002102167700002202188700002202210700002502232856012402257 2019 eng d a0301-479700aHydrodynamic cavitation using vortex diode: an efficient approach for elimination of pathogenic bacteria from water0 aHydrodynamic cavitation using vortex diode an efficient approach cJUL  a210-2190 v2423 a

The present study successfully demonstrates greener methodology of hydrodynamic cavitation using rotational flows for disinfection of water. Disinfection of two model microbial strains-gram-negative (Escherichia colt) and gram-positive (Staphylococcus aureus) using vortex diode was evaluated. The removal efficacy was quantified for two different cavitation reactors. Practically complete elimination of E. coli was achieved (99%) after 1 h of cavitation at a pressure drop of only 0.5 bar. However, elimination of S. aureus using vortex diode was observed to be lower in comparison to the removal of E. coli and only 60% disinfection could be achieved under similar conditions, which can be subsequently enhanced up to 98% by increasing pressure drop. The results were compared with another cavitating device that employs linear flow for cavitation, orifice. The reactor geometry has significant impact on the disinfection process and orifice was found to require significantly higher pressure drop (10 bar) conditions for disinfection and for eliminating grain-positive bacteria with high efficiency. A plausible mechanism for disinfection was proposed to elucidate the role of cavitation in cell destruction leading to death of cells through the rupture of cell wall, oxidative damage and possible DNA denaturation. Also, a cavitation model using per pass disinfection was developed that can provide meaningful physical description of the disinfection process as against the conventional first order reaction rate model. This study would provide meaningful insight into cavitation process based on hydrodynamic cavitation for the destruction of both gram-negative and gram-positive bacteria from various water sources, including industrial wastewaters.

10aCavitation10aDisinfection10akinetics10apollution10aWastewater treatment1 aJain, Pooja1 aBhandari, Vinay, M.1 aBalapure, Kshama1 aJena, Jyotsnarani1 aRanade, Vivek, V.1 aKilledar, Deepak, J. uhttps://library.ncl.res.in/content/hydrodynamic-cavitation-using-vortex-diode-efficient-approach-elimination-pathogenic02959nas a2200241 4500008004100000022001400041245014000055210006900195260000800264300001100272490000700283520213400290653001702424653001502441653001702456653000802473653002002481100001902501700002402520700002102544700002202565856013002587 2020 eng d a1350-417700aDestroying antimicrobial resistant bacteria (AMR) and difficult, opportunistic pathogen using cavitation and natural oils/plant extract0 aDestroying antimicrobial resistant bacteria AMR and difficult op cDEC a1052720 v693 a

The present study reports, for the first time, a new and techno-economic strategy for effective removal of antimicrobial resistant bacteria (AMR) and difficult, opportunistic pathogen using cavitation and natural oils/plant extract. A hybrid methodology using natural oils of known health benefits has been discussed in combination with conventional physico-chemical method of hydrodynamic cavitation that not only provides efficient and effective water disinfection, but also eliminates harmful effects of conventional methods such as formation of disinfection by-products apart from reducing cost of treatment. A proof-of concept is demonstrated by achieving exceptionally high rates for practically complete removal of antimicrobial resistant (AMR) and relatively less researched, gram-negative opportunistic pathogen, Pseudomonas aeruginosa and gram-positive methicillin resistant, Staphylococcus aureus using a natural oil-Peppermint oil and two different cavitating reactors employing vortex flow (vortex diode) and linear flow (orifice) for hydrodynamic cavitation. > 99% disinfection could be obtained, typically in less than 10 min, using vortex diode with operating pressure drop of 1 bar and low dose of 0.1% peppermint oil as an additive, depicting very high rates of disinfection. The rate of disinfection can be further increased by using simple aeration which can result in significant lowering of oil dose. The conventional device, orifice requires relatively higher pressure drop of 2 bar and comparatively more time (similar to 20 min) for disinfection. The cost of the disinfection was also found to be significantly lower compared to most conventional processes indicating techno-economic feasibility in employing the developed hybrid method of disinfection for effectively eliminating bacteria including AMR bacteria from water. The developed approach not only highlights importance of going back to nature for not just conventional water disinfection, but also for eliminating hazardous AMR bacteria and may also find utility in many other applications for the removal of antimicrobial bacteria.

10aAMR bacteria10aCavitation10aDisinfection10aOil10aWater treatment1 aMane, Maya, B.1 aBhandari, Vinay, M.1 aBalapure, Kshama1 aRanade, Vivek, V. uhttps://library.ncl.res.in/content/destroying-antimicrobial-resistant-bacteria-amr-and-difficult-opportunistic-pathogen-using02964nas a2200241 4500008004100000022001400041245012700055210006900182260000800251300001100259490000700270520214700277653001802424653001502442653001702457653000802474653002502482100001902507700002402526700002102550700002202571856012902593 2020 eng d a1350-417700aNovel hybrid cavitation process for enhancing and altering rate of disinfection by use of natural oils derived from plants0 aNovel hybrid cavitation process for enhancing and altering rate  cMAR a1048200 v613 a

The present study is an attempt to improvise the hydrodynamic cavitation methodology for effective disinfection of water and also to suggest prototype development for practical application. The enhancement in the disinfection efficiency was evaluated specifically for the effect of pressure, temperature, pH, microbial inoculum size and also on effect of different additives for the two model microbial strains, gram-negative (Escherichia coli) and gram-positive (Staphylococcus aureus). The efficacy of the hydrodynamic cavitation is evaluated for the two types of flows/cavitation devices - linear flow in the case of orifice and vortex flow for vortex diode. The vortex diode requires significantly lower pressures, 50% lower as compared to orifice for the similar extent of disinfection. While the bacterial disinfection at high temperature is known, the usefulness of hydrodynamic cavitation is especially evident at ambient conditions and the process is effective even at very high concentrations of bacteria, not reported so far. The reactor geometry also has significant effect on the disinfection. The present study, for the first time, reports possible use of different natural oils such as castor oil, cinnamon oil, eucalyptus oil and clove oil in conjunction with hydrodynamic cavitation. The nature of oil modifies the cavitation behavior and an order of magnitude enhancement in the cavitation rate was observed for the two oils, eucalyptus and clove oil for a very small concentration of 0.1%. The increased rates of disinfection, of the order of 2-4 folds, using oil can drastically reduce the time of operation and consequently reduce cost of disinfection. A possible mechanism is proposed for the effect of oil and hydrodynamic cavitation in cell destruction through the rupture of cell wall, oxidative damage and possible DNA denaturation. A cavitation model using per pass disinfection was used to correlate the data. The increased efficiency using oils and possible benefits of the developed process, where natural oils can be perceived as biocatalysts, can have significant advantages in practical applications.

10aAntimicrobial10aCavitation10aDisinfection10aOil10aWastewater treatment1 aMane, Maya, B.1 aBhandari, Vinay, M.1 aBalapure, Kshama1 aRanade, Vivek, V. uhttps://library.ncl.res.in/content/novel-hybrid-cavitation-process-enhancing-and-altering-rate-disinfection-use-natural-oils02440nas a2200265 4500008004100000022001400041245011000055210006900165260000800234300001400242490000700256520159200263653001501855653001201870653001701882653001601899653001701915653001501932100002101947700001901968700002001987700002102007700002402028856012202052 2023 eng d a1618-954X00aDevelopment of multipurpose biomass-derived adsorbents using Coccinia grandis for removal of contaminants0 aDevelopment of multipurpose biomassderived adsorbents using Cocc cDEC a3393-34050 v253 a

The present study is an attempt to develop newer multipurpose biomass-derived adsorbents for water and wastewater treatment; biomass that are easily available, renewable and most importantly, sustainable. A model adsorbent was developed using Coccinia grandis (CG, Ivy gourd) and further modified by impregnating copper nanoparticles (CG-Cu). The adsorbent characterization was done for evaluating surface morphology, surface area and metal modification. The utility of the newer adsorbents was established for the removal of different contaminants such as dyes (cationic Malachite Green, anionic Congo Red and fluorescent cationic Rhodamine B), Active Pharmaceutical Ingredient pollutant (Ciprofloxacin) and also for the removal of pathogenic bacteria, Gram-negative Escherichia coli. Both CG and CG-Cu bio-nanocomposite were highly effective in removal of different contaminants, 99% dye removal for Malachite Green, with a high adsorption capacity of 49 mg/g, higher than that for commercial activated charcoal whereas for all other dyes, the performance of CG-Cu was similar. The isotherm studies indicated multilayer adsorption, in general. A good adsorption capacity of 10.8 mg/g was also observed for the removal of ciprofloxacin. The combined effect of the bio-nanocomposite, CG-Cu was impressive and 100% disinfection was achieved within 10 min, due to the antimicrobial activity of Cu and oxidation effect of reactive oxygen species enhancing the disinfection.Graphical abstractMultipurpose biomass derived adsorbents using Coccinia grandis for removal of contaminants

10aAdsorption10aBiomass10aDisinfection10adye removal10ananomaterial10aSeparation1 aRaj, Surabhi, S.1 aMane, Maya, B.1 aThanekar, Pooja1 aBalapure, Kshama1 aBhandari, Vinay, M. uhttps://library.ncl.res.in/content/development-multipurpose-biomass-derived-adsorbents-using-coccinia-grandis-removal