The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Bruno Delvaux - One of the best experts on this subject based on the ideXlab platform.
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direct evidence of basic Aluminium Sulphate minerals in an s impacted andosol
European Journal of Soil Science, 2005Co-Authors: Thomas Delfosse, Francoise Elsass, Bruno DelvauxAbstract:The formation of basic Aluminium Sulphate (BAS) minerals [(K,Na)(n)Al-x(OH)(y)(SO4)(z)] has often been invoked to explain Sulphate retention in soils. These minerals have not yet, however, been directly observed in the soil. We extracted the clay fractions of Andosols intercepting large inputs of volcanogenic sulphur dioxide and acids (HCl, HF), simply by dispersing clays with Na+-resins in deionized water without any other chemical treatment. Clay fractions concentrate 39-63% of total sulphur content of soil. Transmission electron microscopy coupled with energy-dispersive analysis revealed the presence of BAS particles, appearing as nodules and spheres. These particles have an equivalent diameter smaller than 0.2 mu m. They have an Al:S ratio close to 2.2 and 3.8 and are possibly amorphous aluminite or basaluminite, respectively. They seem to have been formed in microenvironments enriched in Sulphate, but also in fluoride anions. Their formation seems to have been enhanced by the combination of large inputs of acids and SO2 and an effective Al supply from weathering of volcanic glass.
Geoffrey M Evans - One of the best experts on this subject based on the ideXlab platform.
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effect of Aluminium Sulphate on interactions between silica surfaces studied by atomic force microscopy
Water Research, 2007Co-Authors: Bogdan C Donose, Anh V Nguyen, Geoffrey M EvansAbstract:Surface interaction forces between different types of silica surfaces (pure silica beads, borosilicate glass beads polished silicon wafers and fused silica slides) were measured by atomic force microscopy y (AFM) in solutions of Aluminium Sulphate (alum) in order to understand the role ol hydrated Aluminium species on the coagulation of negatively charged oxide colloids n drinking water treatment. The alum coagulant concentration used in this study wa 3 150 mu M Aluminium. The alum solutions were prepared from analytical grade Al-2(SO4 (3) center dot 16H(2)O. It was found that the presence of Aluminium Sulphate at a concentration close to the values typically used in industrial scale water treatment applications generally induced strong, long-range repulsive forces between the various types of surfaces studies d. At this alum concentration streaming potential measurements indicated reversal in the sign of the surface charge. It was also found that whenever borosilicate glass beads were used, the interaction force became strongly attractive when the AFM cell was flushed with deionised water. It was argued that this attraction occurred because of the charge nonuniformity of the Aluminium hydrates adsorbed at the glass surface. A mechanism was proposed to explain the observed interaction phenomena based on the deduced micros ructure of the adsorbed surface layers and to rationalise the new findings for application in drinking water treatment. (C) 2007 Elsevier Ltd. All rights reserved.
Anh V Nguyen - One of the best experts on this subject based on the ideXlab platform.
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effect of Aluminium Sulphate on interactions between silica surfaces studied by atomic force microscopy
Water Research, 2007Co-Authors: Bogdan C Donose, Anh V Nguyen, Geoffrey M EvansAbstract:Surface interaction forces between different types of silica surfaces (pure silica beads, borosilicate glass beads polished silicon wafers and fused silica slides) were measured by atomic force microscopy y (AFM) in solutions of Aluminium Sulphate (alum) in order to understand the role ol hydrated Aluminium species on the coagulation of negatively charged oxide colloids n drinking water treatment. The alum coagulant concentration used in this study wa 3 150 mu M Aluminium. The alum solutions were prepared from analytical grade Al-2(SO4 (3) center dot 16H(2)O. It was found that the presence of Aluminium Sulphate at a concentration close to the values typically used in industrial scale water treatment applications generally induced strong, long-range repulsive forces between the various types of surfaces studies d. At this alum concentration streaming potential measurements indicated reversal in the sign of the surface charge. It was also found that whenever borosilicate glass beads were used, the interaction force became strongly attractive when the AFM cell was flushed with deionised water. It was argued that this attraction occurred because of the charge nonuniformity of the Aluminium hydrates adsorbed at the glass surface. A mechanism was proposed to explain the observed interaction phenomena based on the deduced micros ructure of the adsorbed surface layers and to rationalise the new findings for application in drinking water treatment. (C) 2007 Elsevier Ltd. All rights reserved.
Rosângela Bergamasco - One of the best experts on this subject based on the ideXlab platform.
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Moringa oleifera Lam. and Its Potential Association with Aluminium Sulphate in the Process of Coagulation/Flocculation and Sedimentation of Surface Water
International Journal of Chemical Engineering, 2018Co-Authors: Karina Cardoso Valverde, Leticia Nishi, Milene Carvalho Bongiovani, Priscila Ferri Coldebella, Marcela Fernandes Silva, Rosângela BergamascoAbstract:The present study aims to optimize the operational conditions in surface water coagulation/flocculation and sedimentation step, besides evaluating the association between seeds of Moringa oleifera Lam. (M. oleifera) and the synthetic coagulant Aluminium Sulphate for surface water treatment. The assays were performed in Jar Test using surface water from Pirapo River basin, Maringa, PR. It was observed that the operational conditions affect the coagulation/flocculation and sedimentation process efficiency. Optimal operational conditions for coagulants association are as follows: rapid mixing velocity (RMV) of 105 rpm, rapid mixing times (RMT) of 1 min, slow mixing velocity (SMV) of 30 rpm, slow mixing times (SMT) of 15 min, and sedimentation time (ST) of 15 min; this enables an improvement in the process, contributing to a reduction in synthetic coagulant Aluminium Sulphate demand of up to 30%, combined with an increase in M. oleifera dosage, not affecting the coagulation/flocculation and sedimentation process efficiency, considering the water pH range between 7 and 9.
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moringa oleifera lam and its potential association with Aluminium Sulphate in the process of coagulation flocculation and sedimentation of surface water
International Journal of Chemical Engineering, 2018Co-Authors: Karina Cardoso Valverde, Leticia Nishi, Milene Carvalho Bongiovani, Priscila Ferri Coldebella, Marcela Fernandes Silva, Rosângela BergamascoAbstract:The present study aims to optimize the operational conditions in surface water coagulation/flocculation and sedimentation step, besides evaluating the association between seeds of Moringa oleifera Lam. (M. oleifera) and the synthetic coagulant Aluminium Sulphate for surface water treatment. The assays were performed in Jar Test using surface water from Pirapo River basin, Maringa, PR. It was observed that the operational conditions affect the coagulation/flocculation and sedimentation process efficiency. Optimal operational conditions for coagulants association are as follows: rapid mixing velocity (RMV) of 105 rpm, rapid mixing times (RMT) of 1 min, slow mixing velocity (SMV) of 30 rpm, slow mixing times (SMT) of 15 min, and sedimentation time (ST) of 15 min; this enables an improvement in the process, contributing to a reduction in synthetic coagulant Aluminium Sulphate demand of up to 30%, combined with an increase in M. oleifera dosage, not affecting the coagulation/flocculation and sedimentation process efficiency, considering the water pH range between 7 and 9.
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optimization of process conditions in water treatment through coagulation diagrams using moringa oleifera lam and Aluminium Sulphate
Desalination and Water Treatment, 2015Co-Authors: Karina Cardoso Valverde, Leticia Nishi, Angelica Marquetotti Salcedo Vieira, Milene Carvalho Bongiovani, Priscila Ferri Coldebella, Grasiele Scaramal Madrona, Onelia Aparecida Andreo Dos Santos, Rosângela BergamascoAbstract:AbstractThe construction of coagulation diagrams is provided to obtain colour, turbidity and compounds with absorption at UV254 nm removal by associating the coagulants Moringa oleifera Lam and Aluminium Sulphate to define the optimal conditions of the process in water treatment. Experiments were performed in jar test with several coagulant dosages and coagulation pH. Optimal conditions for raw water with high colour/turbidity were obtained at pH values ranging from 7.5 to 8. After filtration, three dosages of association Aluminium Sulphate—M. oleifera, 25 ppm/300 ppm; 20 ppm/350 ppm and 15 ppm/400 ppm, performed efficient removal of evaluated parameters, namely 97.7% plus for colour and turbidity and 68.2% for compounds with absorption at UV254 nm. Results showed that the use of coagulation diagram is useful since it provides development of tests in optimal conditions, depending on water initial characteristics. The association of coagulants Aluminium Sulphate—M. oleifera may be considered an alternative...
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coagulation diagram using the moringa oleifera lam and the Aluminium Sulphate aiming the removal of color and turbidity of water doi 10 4025 actascitechnol v35i3 12268
Acta Scientiarum-technology, 2013Co-Authors: Karina Cardoso Valverde, Milene Carvalho Bongiovani, Leila Cristina Konradt Moraes, Franciele Pereira Camacho, Rosângela BergamascoAbstract:This work suggests the study of the coagulation diagram as a tool to verify the efficiency in removing color and turbidity of the water, using the Moringa oleifera Lam and the association of this biopolymer with the Aluminium Sulphate as coagulating agents. The assays were carried out in Jar Test, by varying the concentrations of coagulants and pH of coagulation. After the assays of coagulation/flocculation/sedimentation, samples were collected for the evaluation of the process efficiency. Best results were obtained at dose of 50 ppm of Moringa oleifera Lam. When associating the coagulants, the addition of the Aluminium Sulphate provided an increase in the efficiency of coagulation/flocculation, whose parameters of control used were color and turbidity. It was verified that the study of the coagulation diagram is useful, since it enables developing the assays in the optimal range, as a function of the raw water characteristics. The use of the Moringa oleifera Lam can be considered as an alternative technique to the conventional treatment.
R. Anuradha - One of the best experts on this subject based on the ideXlab platform.
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In vivo Antioxidant and Modulating Enzymes of Wattakaka Volubilis and Kaempferol against Aluminium Sulphate Induced in Liver Toxicity
Research Journal of Pharmacy and Technology, 2018Co-Authors: Usharani S, R. AnuradhaAbstract:Objective: The In vivo antioxidant and modulating enzymes of the Wattakaka volubilis leaves and kaempferol against Aluminium Sulphate induced toxicity in rats. Methods: Hepatotoxic rats were treated with methanol extract of Wattakaka volubilis and kaempferol for a period of 14 days. Results: The activities of LPO, SOD, CAT, GSH, GR, GPx and membrane bound enzymes, Mitochondrial enzymes in liver. The activities of all parameters registered a significant (p=0.001) alteration in Aluminium Sulphate treated rats, which were significantly recovered towards an almost normal level in rats co-administered with Wattakaka volubilis extract in a dose-dependent manner. All the biochemical investigations were confirmed by the observations and compared with the standard drug silymarin. Conclusion: Antioxidant enzymes, membrane bound ATPase, mitochondrial TCA cycle enzymes enzymes modulated by kaempferol on Aluminium Sulphate induced liver toxicity.
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EFFICACY OF WATTAKAKA VOLUBILIS AGAINST Aluminium Sulphate INDUCED IN LIVER TOXICITY
International Journal of Pharmacy and Pharmaceutical Sciences, 2018Co-Authors: S Usharani, R. AnuradhaAbstract:Objective: The modulation of membrane-bound ATPases, carbohydrate metabolizing enzymes and mitochondrial TCA cycle enzymes in Wattakaka volubilis on Aluminium Sulphate induced liver toxicity. Methods: Medicinal therapy requires careful assessment of effective treatment offering an acceptable safety over human health. Experimental animals were divided into five groups (Untreated, negative and positive control, hepatic group and the hepatic group fed on Wattakaka volubilis ), Metabolising enzymes level, estimation of DNA, RNA and quantification of DNA fragmentation and gene expression were investigated. These altered enzyme levels were ameliorated significantly by administration of Wattakaka volubilis at the concentration of 200 mg/kg in drug-treated animals. Results : Results showed that treatment with methanol extract of Wattakaka volubilis normal level of enzymes which are compared with silymarin. This was evident from the significant increase in p
