个人简介

Our research can be categorized in two broad areas: (i) advanced treatment technologies for water and waste treatment, and (ii) environmental modelling. All our contributions in research have a direct bearing on the reduction of environment pollution or understanding the fate processes of the pollutants in natural environment. Some of our pioneering research in advanced treatment technologies include: removal of bioaerosol using indoor lighting and a thin layer of TiO2 for designing sanitary surfaces for hospital, food processing industry or other clean room applications; improving the surface area and subsequent improvement in adsorption of organics by TiO2; doped TiO2 nanowires for water treatment and hydrogen production; photochemical reaction pathways relating hydroxyl radical, electron/hole, and superoxide radicals involved in photocatalysis of micropollutants in water; ultrasonication to pretreat anaerobic sludge prior to digestion to improve biogas production, odor removal, and sludge dewatering; membrane processes for removal of volatile compounds and micropollutants from water; application of bioassays for water quality evaluation; and modification of petroleum coke for adsorption of naphthenic acids from oil-sand processed water. In environmental modeling, we use both traditional approaches based on first principles, kinetics and equilibrium processes, and computational fluid dynamics (CFD). The recent work in this area includes modeling of pneumatic dryers for municipal sludge, determination of kinetic constants due to ultrasonic pretreatment of anaerobic sludge in traditional anaerobic digestion model and its sensitivity to relevant pretreatment parameters; design of open channel UV-disinfection reactor using CFD and CFD modeling of jet-mixing in wastewater reactor. Professional Activities (last 5 years) Member, organizing committee, 3rd International Conference Bioprocess and Engineering, 4-5 May, 2015, Baltimore, USA. International Program Committee member, Water Resource Management (AfricaWRM 2014, September 1-3, 2014, Gaborone, Botswana. Co-Chair, Industrial Wastewater Treatment and Environment, CSChE 2013 Annual Conference, October 2013, Fredericton, New Brunswick. Member, International Advisory Board ICACE-2013, on Advances in Chemical Engineering” on March 8-9, 2013, NIT, Raipur, India Executive Member, Environmental Division, Chemical Institute of Canada, since 2012. Member, Technical Committee, IWA Biennial World Water Congress in Busan, Sept 16-21, 2012, Korea. Co-Chair, Environment, CSChE 2012 Annual Conference, October 2012, Vancouver, British Columbia. Review panel member for the Ontario-China Research and Innovation Fund (OCRIF) competition, 2011. Visiting Scholar, China, India and Russia, 2011-2014. Member of the International Program Committee for the IASTED International Conference on Water Resource Management (AfricaWRM 2012), Gaborone, Botswana from 9/5/2012 to 9/7/2012. Member, Editorial Board, Open Journal of Physical Chemistry. Organizational member and theme leader, Environment, CSChE 2011 Annual Conference, October 2011, London, Ontario. Scientific Committee, ECI Conference on the subject of Electrokinetic Processes in Chemical Engineering, February 2010, Niagara Falls, Canada. Scientific Committee, 2010 IWA World Water Congress, August 2010, Montreal, Canada. Chair, OGS Chemical Engineering Panel, 2010 Member, OGS Chemical Engineering Panel, 2012 Member, Stakeholder's Review Group (SRG) for the Ministry of Environment, Canada for projects on water and energy conservation for sewage works and water reclamation and reuse, 2009-2010. Member, International Advisory Committee, enviroenergy 2009, March 19-21, 2009, Chandigarh, India. Guest Editor a special issue on "Emerging Environmental Technologies” for International Journal of Environmental Technology and Management, Vol 9 (1), 2008. Guest Editor a special issue on "Water Management”, International Journal of Environmental Engineering Science (IJEES), 2010. Guest Editor a special issue on " Green Processes and Environmental Sustainability” for International Journal of Chemical Engineering, 2010. Regular reviewer of NSERC, OCE, NSF, Austrian Science Fund, and Saudi Arabian Ministry of Science, Innovation and Technology. Regular reviewer of Canadian Journal of Chemical Engineering, Chemical Engineering Processing, Drying Technology, Environmental Engineering, JSCE, Journal of Aerosol Science, Journal of Hazardous Materials, Industrial & Engineering Chemistry Research, Powder Technology, Separation and Purification Technology, Separation Science and Technology, Toxicological and Environmental Chemistry, Water Research., Environmental Science and Technology, Chemosphere

研究领域

Use of biology based technologies, such as biosorption, is an attractive method for heavy metal removal from metal-laden effluents due to low cost and high efficiency of the biosorption process. The main objective of this work is to examine the ability of yeast cells to be produced and utilized in a continuous fashion for removing metal ions in water. The yeast cells produced in the continuous bioreactor system provided continuously fresh surface for adsorption of the metals without the need for costly pretreatment steps, such as harvesting, separating, heat-killing, drying, and storage of biomass. Oil sands industry extracts bitumen from mixed sands and clay by steam water. In order to produce each volume unit of bitumen, three to four volume units of fresh water are needed. At present, there are two different techniques for extraction of bitumen from oil sands, the first one is open pit mining and the second one is in situ extraction technique. The biggest issue for this industry is recycling and recovery of water from tailing water in order to reduce the needs for freshwater. The overall objective of this project is to develop cost-effective adsorption technologies to reduce fresh water consumption and to enable the recovery of residual organics from oil sands process water and tailings, turning residue petroleum coke into highly active adsorbents, while reducing the need for disposal. Quaternary ammonium compounds (QACs), are cationic surfactants, enhance the bactericidal properties of commercial products and these compounds are resistant to microbial biodegradation, and are used in large quantities. Benzalkonium chlorides are genotoxic in eukaryotic cells in the range between 1.0 to 10 mg L–1, and their release into the environment may cause genetic damage in exposed organisms. In this research, we are characterizing the environmental fate such as adsorption, biodegradation, and transport in soil media of selected QACs. Microalgae communities are crucial members of a functioning wetland ecosystem. In recent years, the toxicity of industrial chemicals on algae has received extensive attention. In this research we are developing an algal bioassay based on the community level physiological profiling (CLPP) using model pollutants. The ubiquitous presence of trace concentrations of numerous organic compounds (micropollutants) such as pharmaceuticals and active ingredients in personal care products in various water streams is of serious concern. We are evaluating various treatment processes such as coagulation, advanced oxidation, and membrane extraction for removal of micropollutants from various water effluents. Solar photocatalytic processes are gaining attention for their potential in energy production using water splitting and sacrificial agents. Nano-sized TiO2 is the most widely examined photocatalyst for this purpose. However, the main barriers of implementing TiO2 are the rapid recombination of photo-generated electron/hole pairs and the poor activation of TiO2 by visible light. Doping TiO2 using various noble and transition metals reduces the possibility of electron-hole recombination. Sacrificial reagents also can inhibit rapid recombination of electron/hole pairs as well as recombination of hydrogen and oxygen. These two concepts are being used in this research. Supercritical carbon dioxide extraction is a promising technology due to the following advantages: carbon dioxide is a ubiquitous compound in nature, it yields zero contamination of analytes in the extract as well as it accommodates extraction of thermally labile compounds. We are using this extraction process to recover valuables from various feedstock. Thermodynamic modeling is employed to simulate the phase equilibria of the systems to determine the solubility of the analytes in CO2 for process optimization. With rising energy costs and a growing focus on energy conservation and carbon footprint reduction, there is increasing demand for energy-efficient aeration technologies. Vertical jet streams introduced from the top of the aeration reactor concurrently mix and aerate while supplying tiny bubbles, resulting in improved performance and energy efficiency of the reactor. Computational fluid dynamics (CFD) is being conducted for process optimization of this type of important reactors.

Process development for waste stream remediation based on physico-chemical principles Environmental Modeling

近期论文

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Removal of Heavy Metals from Aqueous Solutions Using Unmodified Saccharomyces cerevisiae in an On-line Continuous Bioreactor-Biosorption System, Shahram Amirnia, Madhumita B. Ray, Argyrios Margaritis- Chemical Engineering Journal- Accepted November 20 Similitude in an Open Channel UV Wastewater Disinfection Reactor, Rajib Saha, Chao Zhang, and Madhumita B. Ray, DOI:1061/(ASCE)EE.1943-7870.0000902, September 2014, J of Environmental Engineering, ASCE. CFD Simulation and Parametric Study of an Open Channel UVWastewater Disinfection Reactor, August 2014, accepted, Water Quality Research Journal of Canada. Anaerobic Digestibility of Estrogens in Wastewater Sludge: Effect of Ultrasonic Pretreatment, Charu Chawla, Shubhajit Sarkar, Sura Ali, Lars Rehmann, George Nakhla and Madhumita B Ray, Journal of Environmental Management, 145, 307-313, 20 Estrone Degradation in Water and Wastewater, Shubhajit Sarkar, Sura Ali, Lars Rehmann, George Nakhla and Madhumita B. Ray, Journal of Hazardous Materials, 278, 16–24, 20 Photocatalytic Performance of Titanium Dioxide Thin Films from Polymer-Encapsulated Titania, C. Gilmour, J. Zhu., A. Ray and Madhumita B. Ray- Industrial and Engineering Chemistry Research, 52 (50), 17800-17811, 20 doi/abs/1021/ie402096h. CFD simulation and parametric study of an open channel UV wastewater disinfection reactor, R. Saha, M. B. Ray, C. Zhang- WQRJC - Special Issue on "Computational Fluid Dynamics in Water Processes; accepted, November, 20 Effect of solvent immobilization on membrane separation of ibuprofen metabolite: A green and organic solvent analysis, N.S. Williams, H. Gomaa, and M. B Ray- Separation and Purification Technology, 115, 57–65, 20 Sacrificial Hydrogen Generation from Formaldehyde with TiO2/Pt Photocatalyst in Solar Radiation, P. Chowdhury; G. Malekshoar; M.B. Ray, J. Zhu, and A. Ray, Industrial & Engineering Chemistry Research, 52 (14), 5023–5029, 20 Catalytic Reaction in a Circulating Fluidized Bed Riser: Ozone Decomposition- Dongbing Li, Ajay K. Ray, Madhumita B. Ray, and Jesse Zhu, Powder Technology, 242, 65-73, 2013 doi: 1016/j.powtec.2001.0 A Comparative Study of Hydrodynamics in Circulating Fluidized Bed Riser and Downer- Dongbing Li, Madhumita B. Ray, Ajay K Ray, and J. Zhu, Powder Technology, 247, 235-259, 20 Rotational Asymmetry of Reactant Concentration and its Evolution in a Circulating Fluidized Bed Riser Dongbing Li, Jesse Zhu, Madhumita B. Ray, and Ajay Ray, Particuology,10(5),573–581,20 Application of UVLED Photocatalysis to Remove VOCs from Indoor Air, Rifath Sharmin and Madhumita B. Ray, Journal of Air and Waste Management, 62, 1032-1039, 20 1080/10962247.20695760 . Removal of ibuprofen and 4-isobutylacetophenone by non-dispersive solvent extraction using a hollow fibre membrane contactor, N.S. Williams, Madhumita B. Ray, Hassan Gomaa, Separation and Purification Technology, 88, 61-69, 20 Adsorption of Toxic Metals Mixture Using Non-Viable Cells of Saccharomyces cerevisiae Shahram Amirnia, Argyrios Margaritis, Madhumita B. Ray, Adsorption Science and Technology, 30 (1), 43-64, 2012, 1260/0263-6174.30.1.43. Techno-economic Evaluation of Sono-Thermal Pretreatment for Enhanced Anaerobic Digestion of Municipal Waste Activated Sludge, Bipro R Dhar, George Nakhla, Madhumita B. Ray, Waste Management, 32 (3), 543-550, 20 Thermo-Oxidative Pretreatment of Municipal Waste Activated Sludge for Volatile Sulfur Compounds Removal and Enhanced Anaerobic Digestion, Bipro Ranjan Dhar, Elsayed Elbeshbishy, Hisham Hafez, George Nakhla, Madhumita B. Ray, Chemical Engineering Journal, 2011doi:1016/j.cej.2008.0174 (1), 166-174, 20 Visible light active Fe doped TiO2 nanowires grown on Graphene using Supercritical CO2 Nasrin Farhangi, Rajib Roy Chowdhury, Yaocihuatl Medina-Gonzalez, Madhumita B. Ray and Paul A. Charpentier, Applied Catalysis B, 110, 25– 32, 20 Modeling the Influence of Particulate Protein Size on Hydrolysis in Anaerobic Digestion, Saad Aldin, George Nakhla, and Madhumita B. Ray, Industrial Engineering Chemistry Research, DOI: 1021/ie200385e, 50 (18), pp 10843–10849, 20 Catalytic Reaction in a Circulatory Fluidized Bed Downer: Ozone Decomposition, Dongbing Li, Jesse Zhu, Madhumita B. Ray, and Ajay Ray, Chemical Engineering Science, June 2011, Online: http://www.sciencedirect.com/science/article/pii/S0009250911004066, 4615–4623, 20 Simulating the Degradation of Odor Precursors in Primary and Waste Activated Sludge during Anaerobic Digestion, Saad Aldin, Fuzhou Tu, George Nakhla, and Madhumita B. Ray, Applied Biochemistry and Biotechnology, Appl Biochem Biotechnol 164:1292–1304, 20 The Drying of Sludge in a Cyclone Dryer Using Computational Fluid Dynamics, Tarek J. Jamaleddine and Madhumita B. Ray, Drying Technology, 29 (3), 308-322, 20 Photodegradation of 17bEstradiol in Aquatic Solution under Solar Irradiation: Kinetics and Influencing Water Parameters, R. Roychowdhury, P. Charpentier and Madhumita B. Ray, Journal of Photochemistry and Photobiology A: Chemistry, 219, 67-75, 20 doi:1016/j.jphotochem.2001.0 Combination of Mechanical and Chemical Pretreatment for Waste Activated Sludge, Bipro Ranjan Dhar, George Nakhla, Madhumita B. Ray, Bioresource Technology, 102, 3776-3782, 20 The drying of sludge in a pneumatic dryer using computational fluid dynamics, Tarek Jamaleddine and Madhumita B. Ray, Drying Technology, 29(3), 308-322, 20