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17 results on '"Ambat, Indu"'

9. Statistical analysis of sustainable production of algal biomass from wastewater treatment process

Author

Ambat, Indu, Tang, Walter Z., Sillanpää, Mika, Lappeenrannan teknillinen yliopisto, Lappeenranta University of Technology, and fi=School of Engineering Science|en=School of Engineering Science

Subjects
Chemical oxidation demand, Total phosphorus, Biomass, Total nitrogen, Wastewater
Abstract

Algal biodiesel is one of the most promising renewable and eco-friendly source of energy for transportation, when algae is produced from wastewater. During the process, both goals of biodiesel production and wastewater treatment could be achieved simultaneously. However, the optimal condition for algae production remained unanswered. Algal biodiesel could be produced from various wastewater treatments. In this study the relationship between biomass production versus lipid productivity in various wastewater sources is statistically analyzed. Chemical oxidation demand, total nitrogen, total phosphorus, and CO2 sequestration could be achieved during the production of different algal biomass in numerous type of wastewater effluent. The regression of different system models and interpretation of linear coefficients were represented in this statistically approached studies. Apart from that the paper also discuss the uncertainty of linear regressions using Monte Carlo method, influence of physical parameters on biomass production, energy potential and efficiency of nutrient removal using different phototrophic systems. Post-print / Final draft

Published
2018

14. Physico-chemical Characterization and Antibacterial Activity of Ozonated Pomegranate Seeds Oil.

Author

Amri, Zahra, Ben Hamida, Sarra, Dbeibia, Amal, Ghorbel, Asma, Mahdhi, Abdelkarim, Znati, Mansour, Ambat, Indu, Haapaniemi, Esa, Sillanpää, Mika, and Hammami, Mohamed

Subjects
POMEGRANATE, CHAIN scission, OILSEEDS, CARBONYL compounds, BROMATES, FATS & oils
Abstract

The aim of this study is to evaluate the quality index, functional groups changes, and antimicrobial activity of ozonized pomegranate seeds oil (OPSO). Results have shown that peroxide and acidity values were increased with ozonation times. The FT-IR and 1 H NMR analyses of oil samples have confirmed chain scission at C = C bonds of the fatty acid chains during ozonation and the formation of new carbonyl compounds such as aldehyde, 1,2,4-trioxolane. The ozonation reaction improves the antibacterial activity of non-ozonized PSO. These results make an open door to new applications of OPSO. [ABSTRACT FROM AUTHOR]

Published
2020
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17. Photocatalytic degradation of an artificial sweetener (Acesulfame-K) from synthetic wastewater under UV-LED controlled illumination.

Author

Zhao Wang, Giang Nguyen Song Thuy Thuy, Srivastava, Varsha, Ambat, Indu, and Sillanpää, Mika

Subjects
*PHOTOCATALYSIS, *CHEMICAL decomposition, *NONNUTRITIVE sweeteners, *ACESULFAME-K, *SEWAGE, *LIGHT emitting diodes
Abstract

The photocatalytic degradation of an artificial sweetener, acesulfame-K (ACE) was investigated using an ultraviolet light emitting diode (UV-LED) based irradiation in presence of titanium dioxide (TiO2), zinc oxide (ZnO), hydrogen peroxide (H2O2), peroxomonosulfate (PMS, HSO[sub 5]-) and peroxodisulfate (PDS, S2O82-). The pH of ACE solution showed significant effect on the degradation of ACE. It was observed that low pH value enhanced the ACE degradation rate. After 120 min by UV-LED/TiO[sub 2] treatment, the degradation of ACE reached up to 90%, while in UV-LED/ZnO, UV-LED/H[sub 2]O[sub 2], UV-LED/PMS, and UV-LED/PDS degradation rate were found to be 63%, 87%, 76% and 86% respectively. PMS and PDS both oxidant showed good results without the generation of any secondary sludge like other heterogeneous catalysts. The present study showed that in presence of catalysts and oxidants, UV-LED illumination significantly enhanced the degradation rate of ACE in comparison to direct photolysis by UV-LED. Possible degradation pathway of ACE was determined by gas chromatography-mass spectrometry (GC-MS) which confirmed the ACE degradation by generation of three byproducts. [ABSTRACT FROM AUTHOR]

Published
2019
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