Srinath Rajagopalan

@ssn.edu.in

Associate Professor in Department of Civil Engineering
Sri Sivasubramaniya Nadar College of Engineering

Srinath Rajagopalan


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RESEARCH INTERESTS

Sustainable use of wastes in building materials, contaminant fate and transport, microplastics
14

Scopus Publications

Scopus Publications

  • Kinetics of Bioaccumulation of Chromium (VI) in Danio rerio Species
    Indian Journal of Environmental Protection, 2024
  • Sorption kinetics of chromium(VI) in synergetic biochar derived from Saccharum officinarum and Prosopis juliflora
    Srinath Rajagopalan, Aswin Sriram, shobana Purushothaman
    Indian Journal of Chemical Technology, 2024
    This study presents an investigation into the effectiveness of utilizing biomass derived from Prosopis juliflora (Mesquite) and bagasse for the removal of hexavalent chromium -Cr[VI] from water sources. The experimental analysis includes examining the impact of various factors such as adsorbent type, concentration, and temperature on the removal efficiency of Cr[VI]. The obtained data reveal that both Mesquite and bagasse exhibit varying degrees of removal efficiency under different experimental conditions. Mesquite demonstrates higher removal percentages for specific Cr[VI] concentrations, particularly at 100 ppm and a temperature of 60°C. On the other hand, bagasse showcases better removal efficiency for certain concentrations. The comparative analysis of the two adsorbents indicates the influence of their distinct properties on the removal process. The results emphasize the importance of carefully selecting the appropriate adsorbent and optimizing operating conditions to achieve efficient Cr[VI] removal. The findings of this study contribute to the understanding of the potential of Mesquite and bagasse as adsorbents for hexavalent chromium removal and underscore the need for tailored strategies to address diverse water contamination scenarios.
  • Physiochemical properties of contaminated soil under the influence of industrial and municipal wastewater
    S. V. Sivapriya, S. Rajagopalan, A. Duraimurugan, S. Rakesh, P. Ravikumar, S. Suryaprakash
    International Journal of Environmental Science and Technology, 2020
  • On Mechanical and Thermal Properties of Concretes with Rubber as Partial Replacement to Well-Graded Conventional Aggregates
    Srinath Rajagopalan, P. Sreehari, B. Mahalingam, K. Mohammed Haneefa
    Lecture Notes in Mechanical Engineering, 2019
  • Mechanical Characterization and Robustness of Self-compacting Concrete with Quarry Dust Waste and Class-F Fly Ash as Fillers
    B. Mahalingam, P. Sreehari, Srinath Rajagopalan, S. Ramana Gopal, K. Mohammed Haneefa
    Lecture Notes in Mechanical Engineering, 2019
  • Global patterns and environmental controls of perchlorate and nitrate co-occurrence in arid and semi-arid environments
    W. Andrew Jackson, J.K. Böhlke, Brian J. Andraski, Lynne Fahlquist, Laura Bexfield, Frank D. Eckardt, John B. Gates, Alfonso F. Davila, Christopher P. McKay, Balaji Rao, Ritesh Sevanthi, Srinath Rajagopalan, Nubia Estrada, Neil Sturchio, Paul B. Hatzinger, Todd A. Anderson, Greta Orris, Julio Betancourt, David Stonestrom, Claudio Latorre, Yanhe Li, Gregory J. Harvey
    Geochimica Et Cosmochimica Acta, 2015
  • The fallout from fireworks: Perchlorate in total deposition
    Jennie Munster, Gilbert N. Hanson, W. Andrew Jackson, Srinath Rajagopalan
    Water Air and Soil Pollution, 2009
  • Perchlorate in wet deposition across North America
    Srinath Rajagopalan, Todd Anderson, Stephen Cox, Greg Harvey, Qiuqiong Cheng, W. Andrew Jackson
    Environmental Science and Technology, 2009
    Natural perchlorate is believed to be of atmospheric origin, yet no systematic study has been conducted to evaluate perchlorate deposition rate and possible seasonal or spatial variations. This study evaluated perchlorate concentrations in weekly composite wet deposition samples acquired through the National Atmospheric Deposition Program from 26 sites across the continental United States, Alaska, and Puerto Rico for a 1-3 year period. Perchlorate concentrations varied from <5 ng/L to a high of 102 ng/L with a mean of 14.1 +/- 13.5 ng/L for the 1578 total samples. The annual perchlorate flux by site ranged from a low of 12.5 (TX) to 157 mg/ha-year (NE) and averaged 65 +/- 30 mg/ha-year for all sites. Perchlorate concentrations and flux in wet deposition were generally highest in May-August declining to lows in December-February. Average annual perchlorate flux was correlated (r > 0.5; p < 0.001) with Ca2+, K+, NH4+, NO3(-), Cl(-), and SO4(-2). Wet deposition rate of ClO4(-) in the conterminous United States (excluding Alaska, Hawaii, and Puerto Rico) while diffuse, represents a potential annual net mass flux of 51,000 kg, a value comparable to the estimated annual environmental releases from other known ClO4(-) sources.
  • Widespread natural perchlorate in unsaturated zones of the southwest United States
    Balaji Rao, Todd A. Anderson, Greta J. Orris, Ken A. Rainwater, Srinath Rajagopalan, Renee M. Sandvig, Bridget R. Scanlon, David A. Stonestrom, Michelle A. Walvoord, W. Andrew Jackson
    Environmental Science and Technology, 2007
    A substantial reservoir (up to 1 kg ha(-1)) of natural perchlorate is present in diverse unsaturated zones of the arid and semi-arid southwestern United States. The perchlorate co-occurs with meteoric chloride that has accumulated in these soils throughout the Holocene [0 to 10-15 ka (thousand years ago)] and possibly longer periods. Previously, natural perchlorate widely believed to be limited to the Atacama Desert, now appears widespread in steppe-to-desert ecoregions. The perchlorate reservoir becomes sufficiently large to affect groundwater when recharge from irrigation or climate change flushes accumulated salts from the unsaturated zone. This new source may help explain increasing reports of perchlorate in dry region agricultural products and should be considered when evaluating overall source contributions.
  • Alternative water sources in earthwork construction
    Priyantha W. Jayawickrama, Srinath Rajagopalan
    Transportation Research Record, 2007
    During periods of drought, good-quality water becomes a precious commodity, especially in those parts of the United States that receive little rainfall. One way to reduce the demand for drinking water is to substitute non-drinking-quality water in earthwork construction. If nonpotable water from local sources can be used in construction, then the need for hauling in good-quality water from distant sources and the potential for construction delays because of water rationing can be avoided. A research study investigated the feasibility of using alternative water sources in earthwork construction. As a part of this study, alternative water supplies in Texas were identified and characterized for quality and volume availability. In addition, each proposed water source was evaluated to determine whether there were any adverse environmental impacts from its use in earthwork construction. Potential impact from the use of low-quality water on constructability, material behavior, and performance also were evaluated. Of special interest were the effects on corrosive potential, sulfate heave, and dispersion potential of the soil. Simple predictive models are presented to help when decisions are made regarding acceptance or rejection of water obtained from a specific source.
  • Occurrence and formation of non-anthropogenic perchlorate
    W. Andrew Jackson, Todd Anderson, Greg Harvey, Greta Orris, Srinath Rajagopalan, Namgoo Kang
    Perchlorate Environmental Occurrence Interactions and Treatment, 2006
  • Widespread presence of naturally occurring perchlorate in high plains of Texas and New Mexico
    Srinath Rajagopalan, Todd A. Anderson, Lynne Fahlquist, Ken A. Rainwater, Moira Ridley, W. Andrew Jackson
    Environmental Science and Technology, 2006
  • The origin of naturally occurring perchlorate: The role of atmospheric processes
    Purnendu K. Dasgupta, P. Kalyani Martinelango, W. Andrew Jackson, Todd A. Anderson, Kang Tian, Richard W. Tock, Srinath Rajagopalan
    Environmental Science and Technology, 2005
  • Perchlorate occurrence in the Texas southern high plains aquifer system
    W. Andrew Jackson, Srinivasa Kumar Anandam, Todd Anderson, Tom Lehman, Ken Rainwater, Srinath Rajagopalan, Moira Ridley, Richard Tock
    Ground Water Monitoring and Remediation, 2005