RAY, Madhumita B.
Department of Chemical and Biochemical Engineering
BSc (Chem.) Calcutta
BTech (Chem. Eng.) Calcutta
MTech (Chem. Eng.) IIT Kanpur
PhD (Environ. Eng.) Minnesota
Web site: http://www.eng.uwo.ca/people/mray
Advanced treatment technologies for waste streams based on physico-chemical principles
Past and current research projects in advanced treatment technologies are classified as: (i) gas-solid separation, and (ii) advanced oxidation processes. In gas-solid separation, research is primarily focused on developing either new designs or optimizing the existing gas-solid separators. The past and present projects are: (i) development of novel secondary dust collector (post-cyclone), (ii) improvement of droplet flux distribution in venturi scrubber, and (iii) optimization of the existing gas-particle separators using new tools of optimization such as Genetic Algorithm (GA). Research on advanced oxidation processes covers both fundamental and application aspects of this technology. The main research activities are broadly classified as: (i) homogeneous and heterogeneous photochemistry of the volatile organics and diacids, (ii) development and optimization of pollution control technologies based on AOPs and (iii) radiation field modeling in photoreactors. Some specific past and present projects are: (i) application of UV-oxidation for the VOCs in air from air stripping and soil-vapor extraction, (ii) use of novel actinometric method to determine radiation field in homogeneous and heterogeneous photoreactors, (ii) application of various adsorbents to improve the surface area and subsequent improvement in adsorption of organics by TiO2, (iii) application of fluorescent light activated TiO2 for continuous inactivation of bioaerosol, and (iv) establishing correlation between homogeneous and heterogeneous atmospheric photochemistry of organic acids. The research methodology involved laboratory experimentation, modeling and optimization.
The fate and transport of anthropogenic chemicals in natural and engineered systems are studied. Mass transfer models are developed to determine the distribution of hydrophobic organic pollutants in various compartments of natural water and soil environment. The impact of uncertainty in several model parameters is studied by means of Monte Carlo simulations. In addition to traditional models, computational fluid dynamics (CFD) is applied for air dispersion of organic pollutants in indoor work environment, designing of gas-solid separators and pneumatic conveying.
KEYWORDS: Gas-solid Separation, Advanced Oxidation Processes, Particle Technology, Environmental Modeling