ORCID Profile
0000-0002-5627-3628
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Publisher: Springer Berlin Heidelberg
Date: 2010
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 12-2015
Publisher: Elsevier BV
Date: 11-2012
DOI: 10.1016/J.BIORTECH.2012.06.063
Abstract: Co-combustion of hydrochar with lignite was investigated by means of thermogravimetric analysis. Hydrochars were produced from coconut fibers and eucalyptus leaves under hydrothermal conditions at 250°C. The hydrochar was added in varying amounts to lignite for combustion. The results indicated that hydrothermal treatment decreased the volatile matter content and increased the fixed carbon content of the biomaterials. The elevated energy density and decreased ash content of the hydrochar improved its combustion behavior when co-fired with lignite for energy production. The hydrochars derived from coconut fiber and eucalyptus leaves had similar chemical compositions and showed similar influences on lignite combustion. Hydrochar addition increased the burnout and shortened the combustion range of the hydrochar-lignite blends. High combustion efficiency was observed due to the synergistic interactions between hydrochar and lignite during the co-combustion process. A kinetic study showed that the combustion process of hydrochar-lignite blends followed first-order reaction rates.
Publisher: Elsevier BV
Date: 07-2009
Publisher: American Chemical Society (ACS)
Date: 08-04-2010
DOI: 10.1021/IE901289E
Publisher: Elsevier BV
Date: 02-2009
Publisher: Informa UK Limited
Date: 08-2007
DOI: 10.3155/1047-3289.57.8.974
Abstract: An improved ion chromatographic (IC) method has been developed for the separation of nitrate in filter extracts in the presence of high concentrations of nitrite. This analytical method was successfully used for an indirect measurement of ozone (O3) in outdoor and indoor air, following its collection using a nitrite-impregnated passive s ler. The limit of detection and the limit of quantification, using the modified IC method, were 6 microg l(-1) (3sigma) and 20 microg l(-1) (10sigma), respectively. Improved detection limits and low baseline noise were obtained with the use of eluent generator and high-capacity ion exchange column. The optimized method was used for assessing O3 concentration in both indoor and outdoor environments of 28 child care centers (CCCs) located in different parts of Singapore. The O3 concentrations ranged from 0.1 to 11.95 parts per billion (ppb) in indoor and from 3.2 to 21.7 ppb in outdoor environments during the study period. It was found that, among the CCCs investigated in this study, air-conditioned CCCs and those located in close proximity to traffic emissions had significantly lower O3 concentrations indoors.
Publisher: Elsevier BV
Date: 04-2013
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 04-2021
No related grants have been discovered for Rajasekhar Balasubramanian.