Faculty Publications

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Author: search.filters.author.Navalgund, N.Has files: No

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    Isolation of Novel Aerobic denitrifier and optimization of process parameters for biological denitrification using RSM
    (Slovak University of Agriculture info@jmbfs.org, 2019) Joshi, K.; Navalgund, N.; Shet, V.B.; Srinikethan, G.; Ashwini; Sneha; Anusha; Aparna, A.
    The study aimed to isolate and characterize a high efficiency novel bacterium for denitrification in waste water and also to optimize process parameters under aerobic condition. One of the bacteria chosen among four, displayed a maximum of 98% reduction of nitrate. The strain was identified as Enterobacter sp. NCCP-29 by biochemical tests and further identified based on similarity of PCR-16S rRNA using universal primers. The parameters (pH, temperature, agitation speed, C:N ratio) which effect the denitrification were screened using one factor at a time. The pH, temperature and C:N ratio exhibited significant effect on the denitrification using Enterobacter sp. NCCP-29. The levels of these parameters were optimized using a central composite design (CCD). A maximum of 98% denitrification was achieved at pH 6.5, temperature 30°C and C: N ratio of 3:1. The second order model was generated and found to have a good fit with R2 value of 0.93. Investigations revealed the ability of Enterobacter sp. NCCP-29 to remove nitrate under aerobic conditions. © 2019, Slovak University of Agriculture.
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    'RS' and 'GIS' based air quality atlas with integrated land use and land cover change analysis in India
    (ICE Publishing, 2021) Navalgund, N.; Joshi, K.; Srinikethan, S.; Shet, V.B.; Hosamane, S.N.
    In this paper, the effect of land use and land cover and the impact of urbanisation on respirable particulate matter (RSPM), sulfur oxide (SO x ) and nitrogen oxide (NO x ) of the Hubli-Dharwad, a Tier II city in India, are correlated based on the trends in air quality observed from 2006 to 2013, population from 1990 to 2010, the number of vehicles between the periods of 2004 and 2013 and urbanisation between the periods of 1975 and 2009. It has been found that urbanisation has increased threefold from 92 km2 in 1975 to 271 km2 in 2009 and the corresponding decrease in agricultural area was from 368.22 to 123.43 km2. The RSPM in the study region is increasing at a rate of 8.9% per year. The study shows that vehicular pollutants are the major cause of air pollution, followed by industries, with the highest RSPM value of 128 ?g/m3 at traffic junctions in the Hubli-Dharwad region in 2013. Based on the trend analysis, the air quality atlas predicted for 2030 shows that the RSPM level in the air will reach 150 ?g/m3, well above the national ambient air quality standards, and will have serious consequences on human health if proper strategies are not undertaken. Owing to the unique geographical setting of Hubli-Dharwad, its future urbanisation will be in a narrow area, which may lead to a severe air pollution problem that needs immediate attention to provide a safe environment. © 2021 ICE Publishing: All rights reserved.
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    Chemical characterization and source apportionment of ambient PM10 in Hubli-Dharwad region, Karnataka, India
    (World Research Association, 2021) Navalgund, N.; Keshava, J.; Krishna, K.; Srinikethan, S.; Sampagaon, N.; Manoj, K.; Aishwaraya, S.
    In India, particulate matter (PM10) shows very strong persistence and very high levels in most of the tier-II cities along with metropolitan cities and other cities of the world. The present work was to study air pollution (PM10) in Hubli-Dharwad, a tier-II city of Karnataka, India. The mean mass concentration for PM10 varied from 260-410 ppm, substantially higher than guidelines of CPCB. Seasonal variations of these pollutants indicated that higher concentrations of pollutants were observed in summer than in winter seasons with air quality index (AQI) as 211 in summer. The source apportionment study using positive matrix factorization (PMF5) indicated the presence of heavy metals in the atmosphere. Out of 4 identified factors, motor vehicles contributed vastly (38.8%), dust (16.4%), industrial emission (19.8%) and biomass burning (25.0%). This study has found that the source apportionment has distinct regional and seasonal characteristics. Such studies are essential for the Government to make region specific control strategies for particulate pollution in India. © 2021 World Research Association. All rights reserved.