Mozumder Gradient - Mozumder
Gradient

Senior Scientists

Rajib Mozumder, Ph.D.
Email Bio

Education

Ph.D., Earth and Environmental Sciences, Lamont-Doherty Earth Observatory of Columbia University

M.Sc., Hydrogeology, University of Dhaka, Dhaka, Bangladesh

B.Sc., Geology, University of Dhaka, Dhaka, Bangladesh

Expertise

  • Contaminant Fate & Transport
  • Environmental Forensics
  • Hydrogeology
  • Remedial Investigation/Design
  • Numerical Modeling
  • Geostatistics
  • Groundwater Geochemistry
  • Environmental Cost Allocation

    Rajib Mozumder, Ph.D.

    Environmental Engineer

    Email Bio

    Dr. Mozumder is an environmental engineer specializing in the science of soils, sediments, and water.  His project experience includes evaluating water movement and chemical transport in industrial and agricultural soils, aquifers, coal-ash impoundments, landfills, wetlands, and surface waters.  Dr. Mozumder has studied the fate and transport of inorganic and organic chemicals, including metal(loids) such as arsenic and lead; nutrients such as carbon, nitrogen, and phosphorus; and various organofluorine compounds, including per- and polyfluoroalkyl substances (PFAS).  He has employed groundwater, geochemical, and geostatistical modeling tools to evaluate solute transport in complex hydrogeologic settings, and to perform spatiotemporal analysis of environmental data.  He has applied his expertise in environmental forensics and chemical fingerprinting to trace the timing and extent of chemical release from point and non-point sources.  Before joining Gradient, Dr. Mozumder earned his Ph.D. in groundwater geochemistry at the Lamont-Doherty Earth Observatory of Columbia University.  His doctoral thesis was focused on the impacts of pumping on the distribution of arsenic in Bangladesh groundwater.

    Education

    Ph.D., Earth and Environmental Sciences, Lamont-Doherty Earth Observatory of Columbia University

    M.Sc., Hydrogeology, University of Dhaka, Dhaka, Bangladesh

    B.Sc., Geology, University of Dhaka, Dhaka, Bangladesh

    Expertise

    • Contaminant Fate & Transport
    • Environmental Forensics
    • Hydrogeology
    • Remedial Investigation/Design
    • Numerical Modeling
    • Geostatistics
    • Groundwater Geochemistry
    • Environmental Cost Allocation

      Representative Projects

      Fate and Transport of Emerging Contaminants:  Evaluated potential PFAS sources and transport through groundwater for several cases regarding PFAS in public drinking water wells.  Assessed PFAS isomer profiles and  biodegradation pathways of fluorochemicals and their precursors measured in a wide range of environmental media.

      Geochemical Investigation:  Reviewed publicly available literature and data on lead isotope investigations for the identification and attribution of geological lead source in a river watershed.

      Environmental Cost Allocation:  Assessed and analyzed geochemical data for a  superfund site to facilitate the allocation of remedy cost among cooperating parties.  Reviewed the parties’ postion and response papers in support of an equitable cost allocation.

      Environmental Liability Assessment:  Reviewed historical industrial activities and environmental reserve estimates to evaluate the reasonableness of environmental liabilities in a complex clean-up site.

      Groundwater Solute Transport Modeling:  Carried out transient groundwater flow and transport modeling using MODFLOW/MT3D for sulfate, boron, and arsenic from multiple coal-ash surface impoundments to evaluate potential impacts to groundwater.

      Hydrogeologic Assessment:  Analyzed hydrogeologic data to evaluate the migration of chlorinated solvents in groundwater across a large industrial superfund site. 

      Remedial Investigation:  Carried out a comprehensive literature review to establish background standards and cleanup goals for metal(loids) in soil; identified the potential sources of metals to indoor dust; proposed a scientifically justified soil/dust remediation strategy near a former zinc smelter.

      Selected Publications

      Mozumder, MRH; Michael, HA; Mihajlov, I; Khan, MR; Knappett, PSK; Bostick, BC; Mailloux, BJ; Ahmed, KM; Choudhury, I; Koffman, T; Ellis, T; Whaley-Martin, K; San Pedro, R; Slater, G; Stute, M; Schlosser, P; van Geen, A.  2020. "Origin of groundwater arsenic in a rural Pleistocene aquifer in Bangladesh depressurized by distal municipal pumping." Water Resour. Res. 56 : e2020WR027178.

      Mozumder, MRH; Bostick, BC; Selim, M; Islam, MA; Shoenfelt, EM; Ellis, T; Mailloux, BJ; Choudhury, I; Ahmed, KM; van Geen, A.  2020. "Similar retardation of arsenic in gray Holocene and orange Pleistocene sediments: Evidence from field-based column experiments in Bangladesh." Water Res. 183 : 116081.

      Mihajlov, I; Mozumder, MRH; Bostick, BC; Stute, M; Mailloux, BJ; Knappett, PSK; Choudhury, I; Ahmed, KM; Schlosser, P; van Geen, A.  2020. "Arsenic contamination of Bangladesh aquifers exacerbated by clay layers." Nat. Commun. 11 : 2244.

      Khan, MR; Koneshloo, M; Knappett, PSK; Ahmed, KM; Bostick, BC; Mailloux, BJ; Mozumder, RH; Zahid, A; Harvey, CF; Van Geen, A; Michael, HA.  2016. "Megacity pumping and preferential flow threaten groundwater quality." Nat. Commun. 7 : 12833.

      See All Rajib Mozumder Publications