Refereed Journal Articles & Book Chapters:


 

Liu, G., Roy, D., Rosen, M. J., "A Simple Method to Estimate the Surfactant Micelle-Water Distribution Coefficient of Aromatic Hydrocarbons", Langmuir, Vol. 16 (8), 3595-3605, 2000.

Roy, D., Maillacheruvu, K., Mouthon, J., "Bioregeneration of Granular Activated Carbon Loaded with 2,4,D", Journal of Environmental Science and Health, B34 (5), 769-791, 1999.

Zhang, C., Valsaraj, K. T., Constant, W. D., Roy, D., "Aerobic Biodegradation Kinetics of Four Anionic and Nonionic Surfactants at Sub- and Supra- Critical Micelle Concentrations (CMCs)", Water Research, 33 (1), 115-124, 1999.

Zhang, C., Valsaraj, K. T., Constant, W. D., Roy, D., "Surfactant Screening for Soil Washing : Comparison of Foamability and Biodegradability of a Plant-Based Surfactants with Commercial Surfactants", Journal of Environmental Science and Health, Part A, 33 (7), 1249-1273, 1999.

Zhang, C., Valsaraj, K. T., Constant, W. D., Roy, D., "Nutrient and Surfactant Enhancement for the Biodegradation  in the Wastewater from a Louisiana Superfund Site", Journal of Hazardous Materials, 62, 41-58, 1998.

Jackson, A., Kommalapati, R. R., Roy, D., Pardue, J., "Enhanced transport of Bacteria through Soil Matrix using Colloidal Gas Aphron Suspensions”, Journal of Environmental Science and Health, Vol. 33, No. 33, March 1998.

Zhang, C., Valsaraj, K. T., Constant, W. D., Roy, D., "Kinetic Modeling of a Diauxic Microbial Growth in Plant-Based Natural Surfactant from Sapindus mukorossi", Journal of Environmental Science and Health, Vol. A33, No. 3, 405-424, 1998.

Roy, D., Kommalapati, R. R, Mandava, S.S., Valsaraj, K. T., Constant, W. D., "Soil washing Potential of a Natural surfactant", Environmental Science and Technology, Vol. 31 (3): p 670, 1997.

Kommalapati, R. R, and Roy, D., "Bioenhancement of Soil Microorganisms in Natural Surfactant Solution: II- Anaerobic", Journal of Environmental Science and Health, Vol. 32A (3), 1997.

Kommalapati, R. R. and Roy, D., "Bioenhancement of Soil Microorganisms in Natural Surfactant Solutions: III - Effect of Hexachlorobenzene", Journal of Environmental Science and Health, Vol. 32A (6), pp 1763-1779, 1997.

Roy, D, Mostafa, H., Maillacheruvu, K. Y., "Aniline Degradation in a Soil Slurry Bioreactor",  J. Environmental Science and Health, A32 (8), 1997.

Kommalapati, R. R, Roy, D., Valsaraj, K. T., Constant, W. D., "Aqueous Solubility Enhancement and Desorption of Hexachlorobenzene from Soil using a Plant Based Natural Surfactant", Water Research , Vol 31, No. 9, pp 2161-2170, 1997.

R. R. Kommalapati, Roy, D., Valsaraj, K. T., and Constant W. D., "Soil Flushing using Colloidal Gas Aphron Suspensions Generated from Plant-based surfactant Solutions", J. Hazardous Materials (In Review), 1997.

Ro, K., Venugopal, Adrian, D. D., Constant, W. D., Quasi, K., Valsaraj, K. T., Thibodeaux, L. J, Roy, D., “Solubility of Trinitrotoluene (TNT) in Water”, J. Chem Engg. Data,  Vol 41 (4): 758-761, 1996.

Kommalapati, R. R., Roy, D., Valsaraj, K. T., Constant, W. D., "Characterization of Collodial Gas Aphron Suspensions Generated from Plant Based Natural Surfactant Solutions", Separation Science and Technology, Vol 31 (17):2317-1333, 1996.

Kommalapati, R.R. and Roy, D, "Bioenhancement of Soil Microorganisms in Natural Surfactant Solution: I - Aerobic," Environmental Science and Health, Vol 31A (8), 1951-1964, 1996. 

Roy, D and Liu, M. " Anthracene Removal from Soil Column by Surfactant", Chapter 11, pp 258-283, Advances in Environmental Control Technology, Gulf Publishing Co., Houston, USA, 1996.

Zhang, C., Valsaraj, K.T, Constant. W.D., and Roy, D., " Studies in Solvent Extraction Using Polyaphrons ",  Separation Science and Technology, 31 (8): 1059-1074, 1996.
 
Zhang, C., Valsaraj, K.T, Constant. W.D., and Roy, D., " Studies in Solvent Extraction Using Polyaphrons II. Semibatch and Continuous Countercurrent  Extraction/ Floatation of a Hydrophobic Organic Dye from Water",  Separation Science and Technology,  31 (10): 1463-1482, 1996.
 
Chung, K.H., Ro, K.S., and Roy, D., "Fate and Enhancement of Atrazine Biotransformation in Wetland Sediment" Water Research,  Accepted 1996. (In Print)

D. Roy, G. Anagnostu, and P. G. Chaphalkar, "Analysis of Respirometric Data to Obtain Kinetic Coefficients for Biodegradation of 1,4-Dioxane". Journal of Environmental Science and Health, A30(8), 1775-1790, 1995

Liu, Minwen and Roy, D., "Surfactant Induced Interactions and Hydraulic Conductivity Changes in Soil",  Waste Management, Vol 15 (7), 463-470, 1995.

Liu, Minwen, G.T. Wang and Roy, D., "Reactions and Transport Modeling of Surfactant and Anthracene in Soil Washing Process", Waste Management, Vol 15 (5/6), 423-432, 1995. 

Roy, D., S. Kongara, and K.T. Valsaraj, " Removal of Napthalene by  Surfactant  Soil Flushing", Journal of Hazardous Materials, Vol 42, pp247-263, 1995. 

D. Roy, R. Kommalapati, K.T. Valsaraj and W.D. Constant, "In-situ Soil Flushing of Residual Transmission Fluid: Application of Colloidal Gas Aphron Suspensions and Conventional Aqueous Surfactant Solution", Water Research, 29, 2, pp 589-595, 1995.

Chung, K.H,  K.S. Ro, and D. Roy, "Anaerobic Atrazine Biotransformation in Wetland Sediment Under Different Nutrient Conditions", Journal of Environmental Science and Health, Vol A30, No. 1, pp109-120, 1995.

D.Roy, G. Anagnostu and P. Chaphalkar, "Biodegradation of Industrial Wastes Containing Dioxane and Diglyme", Journal of Environmental Science and Health,  A 29, No.1, pp129-147, 1994.

D. Roy, Minwen Liu, and Guang-Te Wang, " Modeling of Anthracene Removal from Soil Columns by Surfactant", Journal of Environmental Science and Health, A 29, No 1, pp 197-214, 1994.

A. Jackson, D. Roy, and G. Breitenbeck, "Transport of a Bacterial Suspension Through a Soil Matrix using Water and Charged Surfactant", Water Research, Vol 28, No. 4, pp 943-949, 1994.

P.G. Chaphalkar, K.T. Valsaraj and D.Roy, "Floatation Using Microgas Dispersions  for the Removal of Pentachlorophenol from Aqueous Solutions", Separation Science and Technology,   Vol. 29, No. 7,  pp 907-921, 1994.

Roy, D., K.T. Valsaraj, W. D. Constant and M. Darji, "Removal of Hazardous Oily Waste from a Soil Matrix Using Surfactants and Colloidal Gas Aphron Suspensions under Different Flow Conditions", Journal of Hazardous Materials, 38, pp127-144, 1994. 

C. Hinz, S. Kallur, D.D. Adrian and D. Roy, "Transport of 2,4-D in Soil Columns as affected by aggregation and organic matter", Transportation Research Record, 1420,  pp 65-70, 1993.

P.G. Chaphalkar and D. Roy, "Solute Transport in Packed Sand Columns By Collodial Gas Aphrons: Experimental Evidence and Modeling Approach", Journal of Environmental Systems, Vol 23, N0. 1, pp 51-56, 1992-93.

D. Roy, Guang Te-Wang, and D.D. Adrian, "Simplified Calculation Procedure for Carbon Adsorption Model", Journal of Water Environment Federation,  Vol 65, No. 6,  pp 781-787, 1993.

Chaphalkar, P.G, Valsaraj, K.T., Roy, D. , “ A Study of the size Distribution and Stability of Colloidal Gas Aphrons using Particle Size Analyzer”, Seperation Science and technology, Vol 28 (6), pp 1287-1302, 1993.

Wang, G.T. and Roy, D., " Approximate Semianalytical Solution for Nonlinear Surface Diffusion in a Batch Reactor ", Environmental Science and Technology, Vol 27, No. 5, 923-927, 1993.

D. Roy, Guang-De Wang and D.D. Adrian, " A Simplified Solution Technique for Carbon Adsorption Model" Water Research, vol 27, No. 6, pp 1033-1040, 1993.

Minwen Liu and D. Roy, " Washing of Hydrophobic Organic from Contaminated Sand with a  Surfactant", Journal of Minerals and Metallurgical Processing, pp 206-208, November, 1992.   

D. Roy, K.T. Valsaraj and V. J. Amedee, " Treatability of Water-Based Drilling Fluids Using Colloidal Gas Aphrons", Fluid/Particle Separations Journal, Vol 5, No.1, 31-36, 1992.

D. Roy, K.T. Valsaraj and S.A. Kottai, "Separation of Organic Dyes from Wastewater by Using Colloidal Gas Aphrons", Separation Science and Technology, Vol 27, No. 5, pp 573-588, 1992.

D. Roy, K.T. Valsaraj and A. Tamayo " Comparison of Soil Washing Using Conventional Surfactant Solutions and Colloidal Gas Aphrons", Separation Science and Technology, Vol 27, No. 12, pp 1555-1568, 1992.

Komalapati R. Rao, G.T. Wong, D. Roy, and D.D. Adrian, "Transport and Retention of Microorganisms through Porous Media: Comparison of NUmerical Techniques and Parameter Estimation", Journal of Environmental Systems, Vol 21(2), 121-145, 1991-92.

Roy, D. 1989,"Dehalogenases for Detoxification of Chlorinated Aromatic Compounds from Pseudomonas Species, Designation No. B-l8086," U.S. Patent., 1989.

Roy, D., 1989, "Dehalogenases for Detoxification of Chlorinated Aromatic Compounds from Pseudomonas Species, Designation No. B-l8087," U.S. Patent., 1989.
 
Singhal, N. and Roy, D., "Modeling Degradation Kinetics of 2,4-D for Two Engineered Microorganisms," Jour. Chemical Engineering, Vol 39, B37-45, 1988. 

Gough, R. H., Roy, D., McDowell, T. R., "Methane Generation from the Digestion of Whey in a Two-Stage System," Jour. of Environ. Sic. and Health, A22 (5), 463, l987.

Roy, D. and Jones, L. M., "Methane Production by Anaerobic RBC," Intl. Journal of Energy Conversion and Management, Vol. 27, p. l94, l987.

Roy, D., Gough, R. H., Jones, L. M., "Comparison of Attached and Suspended Growth Methanogene-sis in a Two Phase System," Journal of Environ. Science and Health, A2l (8), 769, l986.

Roy, D., and Mitra, S., "Degradation of Chlorinated Aromatic Compounds by Dehalogenases of Two New Pseudomonas Species."  Biotech. Bioengr. Symp. No. l7, p. 275, l986.

Roy, D., Jones, L. M., "Acidogenesis in the Two-Phase Anaerobic Process".  Journal of Environ. Science and Health, A20 (l), l, l985.

Haas, C. N., Severin, B. F., Roy, D., Engelbrecht, R. S., and Lalchandani, A., "Removal of New Indicators of Disinfection Efficiency by Coagulation--Flocculation and Rapid Sand Filtration".  Journal of American Water Work Assoc, 77, 2, 67, l985.

Haas, C., Severin, B. F., Roy, D., Engelbrecht, R. S., Lalchandani, A., and Farooz, S., "Field Observations on the Occurrence of New Indicators of Disinfection Effi-ciency".  Water Research, l9, 3, 323, l985.

Wetzler, T. F., and Roy, D., "Detection and Occurrence of Waterborne Bacterial Pathogens an Viruses".  Jour. Wat. Poll. Contr. Fed., 56, 6, l984.

Roy, D., and Jones, L. J., "Developments of Anaerobic Treatment," in Current Practices in Environmental Engineering, Singh and Sharma (ed.), Chapter 8, Vol. l, l984.

L. M. Jones, D. Roy, "Attached and Suspended Growth Methano-genesis".  Proc. l982 National Conference on Environmental Engineering, Amer. Soc. of Civil Engineers, July l982.

D. Roy, E. S. K. Chian, R. S. Engelbrecht, "Mathematical Model for Enterovirus Inactivation".  Water Research, l6, 5, 667, May l982.

Roy, D., M. E. Tittlebaum, "Microbiology - Detection, Occurrence and Removal of Viruses".  Jour. Wat. Poll. Control Fed., 54, 6, 984, June l982.

D. Roy, R. S. Engelbrecht, P. K. Y. Wong, E. S. K. Chian, "Inactiva-tion of Entero-viruses by Ozone".  Water Science and Technology, Vol. l3, No. 2, 8l9, l98l.

D. Roy, P. K. Y. Wong, R. S. Engelbrecht, "Mechanism of Enteroviral Inactivation by Ozone".  Applied and Environmental Microbiology, 4l, 3, 7l8, March l98l.

D. Roy, M. E. Tittlebaum, J. D. Meyer, "Microbiology-Detection, Occurrence and Removal of Viruses".  Journal Water Pollution Control Federation, 53, 6, ll38, June l98l.

D. Roy, E. S. K. Chian, R. S. Engelbrecht, "Kinetics of Enteroviral Inactivation by Ozone". Jour. American Society of Civil Engineers,  Environ-mental Engineering Division, l07, 887, October l98l.

D. Roy, R. S. Engelbrecht, E. S. K. Chian, "Relative Resistance of Inactivation of Six Enteroviruses by Ozone".  Jour. Amer. Water Works Assoc., 74, l2, Dec. l982.

D. Roy, "Microbiology - Detection, Occurrence and Removal of Viruses".  Journal Water Pollution Control Federation, 52, l839, l980.

D. Roy, E. S. K. Chian, "Treatment of Municipal Wastewater Effluent for Potable Water Reuse".  Proc. Water Reuse Conference, Am. Water Works Assoc., Vol. l, 246, l979.