http://nopr.niscair.res.in/handle/123456789/2701 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/2794 Title: Dust dispersion modeling using fugitive dust model at an opencast coal project of Western Coalfields Limited, India <br/> <br/>Authors: Trivedi, Ratnesh; Chakraborty, M K; Tewary, B K <br/> <br/>Abstract: This paper examines different sources of dust generation and quantifies dust emission rates from different point, area and line sources considering background dust concentration at one of the Opencast Coal Project (OCP) of Western Coalfields Limited. Air quality modeling using Fugitive Dust Model (FDM) reveals that dust generated due to mining activities does not contribute to ambient air quality significantly in surrounding areas beyond 500 m in normal meteorological conditions. Predicted values of total suspended particulate matter (TSPM) using FDM are 68-92% of observed values. A management strategy is formulated for effective control of air pollution at source and other mitigative measures including green belt design have also been recommended. <br/> <br/>Page(s): 71-78 Mon, 29 Dec 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/2793 Title: Study of human exposure to fine particulates and respiratory tract depositions in residents of an industrial environment in India <br/> <br/>Authors: Singh, Shri Nath; Sharma, Rajnikant <br/> <br/>Abstract: This paper estimates personal exposure to particulate matter (PM), deposition and status of selected toxic metals in respiratory tract washout samples obtained from 20 humans residing in township of an industrial environment in central India. All humans samples for personal PM exposure and respiratory tract depositions, collected during winter season, were analyzed for selected toxic elements (Pb, Cr, Cd, Co and Ni). Personal PM₅ exposure levels were found between 2.6-48.6 µg/m³ for various categories. Chemical analysis of PM samples shows that higher risk is associated with housewives who spend their time (> 85%) indoors. Good positive correlation coefficient value is found for PM concentrations and respiratory tract depositions. <br/> <br/>Page(s): 66-70 Mon, 29 Dec 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/2792 Title: Boiler tube failures (BTFs) in natural circulation high pressure drum boiler of a power station <br/> <br/>Authors: Sohail, M Azad; Mustafa, A Ismail; Gafur, M Abdul <br/> <br/>Abstract: This paper assesses boiler tube failures (BTFs), especially in boiler water wall tubes (BWWTs) for a natural circulation high-pressure fossil (natural gas) drum boiler unit (TIME-COB-206, Russia). Metallographic (micro and macrostructural) examinations of BWWTs materials (carbon steel, Russia) were carried out extensively. Analyses of carbon (mild) steels (0.22% C) revealed distinctive changes in ferrite-pearlite distribution, might be due to decarburization. Huge pits, few grooves followed by flow lines were observed on internal surfaces of BWWTs with respect to length of power plant operation. Corrosions or scaling in BWWTs depicted one of the major causes of BTFs in fossil units with drum boilers usually treated by coordinated phosphates. <br/> <br/>Page(s): 61-65 Mon, 29 Dec 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/2791 Title: Effect of soil and cow dung proportion on vermi-composting by deep burrower and surface feeder species <br/> <br/>Authors: Munnoli, P M; Bhosle, Saroj <br/> <br/>Abstract: Use of earthworm species to biodegrade various substrates (industrial wastes, agricultural residues, etc.) for composting has proven to be successful after initial stabilization of vermi beds. This study presents optimization of vermi beds (soil + cowdung) for culturing of earthworms (Eisenia fetida, Eudrilus eugeniae, and Megascolex megascolex.). Optimum proportion of soil + cowdung (1:3) for culturing of earthworms has shown highest number of earthworms hand sorted in all the three species. Among three species, E. eugeniae showed highest number of earthworms after 32 days. In compost preparation, earthworms reduced pH as follows: E. fetida, 6.7 to 6.1; E.eugeniae, 6.7 to 6.0; and M. megascolex, 6.7 to 6.4. <br/> <br/>Page(s): 57-60 Mon, 29 Dec 2008 22:58:59 GMT