Wastewater Treatment and Management

1. H.Roques, B.Capdeville, J.Seropian, H.Grigoropoulou  (1984) “Oxygenation par le peroxyde d'hydrogene des biomasses fixees utilisees en traitement biologique des eaux” Water Research 18 (1): 103?110.
2. H. Grigoropoulou, G. Drogaris (1984) “Anaerobic treatment of municipal and industrial wastewaters” Bulletin of the Institution of Chemical Engineers of Greece: Industry and Environment, Industrial Pollution and Treatment Facilities, pp. 49 - 56 (in greek).
3. H. Grigoropoulou (1994) “Treatment of wastewaters from coal gasification units”, Technica Chronika, -C’ 14: 61-75 (in greek).
4. Ε. Sotirakou, G. Kladitis, N. Diamandis, H. Grigoropoulou (1999) “Ammonia and phosphorus removal in a municipal wastewater treatment plant with extended aeration” Global Nest: the International Journal 1 (1): 47-54.
5. O. Dovletoglou, C. Philippopoulos, H. Grigoropoulou (2002) “Coagulation for treatment of paint industry wastewater” J. of Env. Sci. Health-Part A., A37 (7): 1361-1377.
6. S.G. Poulopoulos, E.C. Voutsas, H.P. Grigoropoulou, C.J. Philippopoulos (2005) “Stripping as a pre-treatment process of industrial oily wastewater” Journal of Hazardous Materials B117: 135-139.
7. D.A. Georgantas, H.P. Grigoropoulou (2005) “Phosphorus removal from synthetic and municipal wastewater using spent alum sludge” Water Science and Technology 52 (10): 525-532.
8. D.A. Georgantas, H.P. Grigoropoulou (2006) “Phosphorus and organic matter removal from synthetic wastewater using alum and aluminum hydroxide” Global Nest Journal 8 (2): 121-130.
9. P. Karka, D. Lekkas, E. Grigoropoulou, D. Assimacopoulos, “Conceptual modeling of organic material production in urban wastewater systems”  Urban Water accepted 16/7/2010.

Catalytic oxidation of pollutants in gaseous and aqueous phase

1. D.G. Svoronos, H.P. Grigoropoulou, C.J. Philippopoulos (1995) “The Effect of Pt/Al2O3 Catalyst Preparation Conditions upon its Activity on Nitric Oxide Reduction” Applied Catalysis part B, Environ. 5 (4): 319-328.
2. Α. Strouvalis, H. Grigoropoulou, C. Philippopoulos (1997) “The Influence of pH on the Activity of Rh/γ-Al2O3 Catalysts” Chemical & Biochemical Engineering Q. 11 (2): 97-100.
3. J. Karafyllis, C. Philippopoulos, H. Grigoropoulou (1997) “Oxidation of Ethanol over CuO/γ-Al2O3 Catalyst: Influence of Oxygen Concentration on Acetaldehyde Yield” Chemical & Biochemical Engineering Q. 11 (3): 121-125.
4. H.P. Grigoropoulou, C.J. Philippopoulos (1997) “Homogeneous Oxidation of Phenols in Aqueous Solution with Hydrogen Peroxide and Ferric Ions” Water Science and Technology 36 (2-3): 151-154.
5. S. Poulopoulos, H.P. Grigoropoulou, C.J. Philippopoulos (2002) “Acetaldehyde yield and reaction products in the catalytic destruction of gaseous ethanol» Catalysis Let., 78 (1-4): 291-296.
6. K. Tzortzatou, H. Grigoropoulou (2010) “Catalytic oxidation of industrial organic solvent vapors” Environmental Science and Health Vol. 45, no.5 534-541.

Ion exchange on natural zeolites

1. V. Inglezakis, N. Diamandis, M. Loizidou, H. Grigoropoulou (1999) “Effect of pore clogging on kinetics of lead uptake by clinoptilolite” Journal of Colloid and Interface Science 215: 54-57.
2. V. J. Inglezakis, C.D. Papadeas, M.D. Loizidou, H. Grigoropoulou (2001) “ Effects of pretreatment on physical and ion exchange properties of natural clinoptilolite” Environmental Technology 22 (1): 75-83.
3. V. J. Inglezakis, Κ.J. Hadjiandreou, M.D. Loizidou, H. Grigoropoulou (2001) “Pretreatment of natural clinoptilolite in a laboratory-scale ion exchange packed bed” Water Research 35 (9): 2161-2166.
4. V. J. Inglezakis, H. Grigoropoulou (2001) “Applicability of simplified models for the estimation of ion exchange diffusion coefficients in zeolites” Journal of Colloid and Interface Science 234 (2): 434-441.
5. V. J. Inglezakis, M. Lemonidou, H. P. Grigoropoulou (2001) “Liquid holdup and flow dispersion in zeolite packed beds” Chemical Engineering Science 56 (17): 5049-5057.
6. V. J. Inglezakis, M.D. Loizidou, H. Grigoropoulou (2002) “Equilibrium and kinetic ion exchange studies of Pb2+, Cr3+, Fe3+ and Cu2+ on natural clinoptilolite” Water Research 36 (11): 2784-2792.
7. Α. Α. Zorpas, V. J. Inglezakis, M. Loizidou, H. P. Grigoropoulou (2002) “Particle size effects on uptake of heavy metals from sewage sludge compost using natural zeolite clinoptilolite” Journal of Colloid and Interface Science 250 (1): 1-4.
8. V. J. Inglezakis, A. A. Zorpas, M. D. Loizidou, H. P. Grigoropoulou  (2003) “Simultaneous removal of metals Cu2+, Fe3+ and Cr3+ with anions SO42- and HPO42- using clinoptilolite” Microporous and Mesoporous Materials  61 (1-3): 167-172.
9. V. J. Inglezakis, H. P. Grigoropoulou (2003) “Modeling of ion exchange of Pb2+ in fixed beds of clinoptilolite” Microporous and Mesoporous Materials 61 (1-3): 273-282.
10. V. J. Inglezakis, M. D. Loizidou, H. P. Grigoropoulou (2003) “Ion exchange of Pb2+, Cu2+, Fe3+ and Cr3+ on natural clinoptilolite: selectivity determination and influence of acidity on metal uptake” Journal of Colloid and Interface Science 261 (1): 49-54.
11. V. J. Inglezakis, M. D. Loizidou, H. P. Grigoropoulou (2004) “Studies on the pretreatment of zeolite clinoptilolite in packed beds” Environmental Technology 25 (2): 133-139.
12. V. J. Inglezakis, H. P. Grigoropoulou (2004) “Effects of operating conditions on the removal of heavy metals by zeolite in fixed-bed reactors” Journal of Hazardous Materials B112 (1-2): 37-43.
13. V. J. Inglezakis, M.  M. Loizidou, H .P. Grigoropoulou (2004) “Ion Exchange Studies on Natural and Modified Zeolites and the Concept of Exchange Site Accessibility” Journal of Colloid and Interface Science 275 (2): 570-576.
14. V.J. Inglezakis, A.A. Zorpas, M.D. Loizidou, H.P. Grigoropoulou (2005) “The effect of competitive cations and anions on ion exchange of heavy metals” Separation and Purification Technology 46: 202-207.
15. Petrakakis, Y., Mylona E., Georgantas, D., Grigoropoulou, H (2007) “Leaching of lead from clinoptilolite at acidic conditions” Global Nest Journal 9 (3): 207-213.

 Sorption/desorption of compounds and ionic species

1. D.A. Georgantas, V.M. Matsis, H.P. Grigoropoulou (2006) “Soluble phosphorus removal through adsorption on spent alum sludge” Environmental Technology 27 (10): 1081-1088(8).
2. Vasileios Matsis, Dimitrios Georgantas, Helen Grigoropoulou (2006) “Removal of n-butyl mercaptan using stripping with an inert gas: a nonequilibrium approach via mass balances” Ind. Eng. Chem. Res. 45: 1766-1773.
3. V.M. Matsis, H.P. Grigoropoulou (2006) “Aeration/stripping of n-butyl mercaptan in aqueous environment” Global Nest Journal 8 (2): 103-112.
4. E. Kouvelos, K. Kesore, T. Steriotis, H. Grigoropoulou, D. Bouloubasi, N. Theophilou, S. Tzintzos, N. Kanelopoulos (2007) “High pressure N2/CH4 adsorption measurements in clinoptilolites”  Microporous and Mesoporous Materials 99: 106-111.
5. D.A. Georgantas, H.P. Grigoropoulou (2007) “Orthophosphate and metaphosphate ions removal from aqueous solution using alum and aluminum hydroxide” Journal of Colloid and Interface Science 315: 70-79.
6. K. Elaiopoulos, Th. Perraki, H. Grigoropoulou (2007) “Mineralogical study and porosimetry measurements of zeolites from Scaloma area, Thrace, Greece” Microporous and Mesoporous Materials 112: 441-449.
7. Vassileios M. Matsis, Helen P. Grigoropoulou (2008) “Kinetics and equilibrium of dissolved oxygen adsorption on activated carbon” Chemical Engineering Science 63: 609-621.
8. K. Elaiopoulos, Th. Perraki, E. Grigoropoulou (2010) “Monitoring the effect of hydrothermal treatments on the structure of a natural zeolite through a combined XRD, FTIR, SEM and N2-porosimetry analysis” Microporous and Mesoporous Materials 134: 29-43.

Conference Proceedings

Wastewater Treatment and Management

1. D. Psalidas, H. Grigoropoulou (1991) “Coagulation of sceptic sewage with a calcium-bearing industrial waste” Proceedings of the Second Conference on Environmental Science and Technology, pp. 73 - 82, University of the Aegean, Environmental Department, Mitilini, Greece (in greek).
2. H. Grigoropoulou, A. Avouri, Β. Daoultzi, R. Perantonaki (1993) “The Greek Environmental Legislation”, Proceedings of the First International Congress on Environmental Technology, pp. 214 - 232, Τechnical Chamber of Greece, 1 - 4 Αpril (in greek),.
3. J. Giovanoudis, H. Grigoropoulou (1997) “Measurement of residence time distribution in a crossflow plastic media biological filter” Proceedings of the Fifth Conference on Environmental Science and Technology, pp. 556 - 564, University of the Aegean, Environmental Department, Mitilini, Greece (in greek).
4. Ch. Hadjiliondos, H. Grigoropoulou, V. Kostoglou, St. Ezanides, H. Papachristou (1998) “Aerobic Treatment of Winery and Distillery Wastewater” Proceedings of the Fourth International Symposium on Waste Management. Problems in Agro-industries, pp. 325 - 332, IAWQ, Istanbul-Turkey.
5. V. Inglezakis, J. Goritsas, K. Philippopoulos, H. Grigoropoulou (1999) “Coagulation of paint industry wastewater with ferrous sulphate” pp. 97-100, 2nd Panhellenic Congress on Chemical Engineering, Thessaloniki, Greece (in greek).
6. Ο. Dovletoglou, A. Antoniou, K. Philippopoulos, H. Grigoropoulou (2000) « Physicochemical treatment of paint industry wastewaters” 1st World Water Congress of the International Water Association, Paris 3-7 July, poster session no 1, Industrial Wastewater.
7. Κ. Spanoudaki, H. Grigoropoulou, A. Hourdakis, N. Kalogerakis (2001) “Measurement of the oxygen transfer coefficient in  wastewater treatment plants aerated by static diffusers” pp. 973-976, 3rd Panhellenic Congress on Chemical Engineering, Athens, Greece (in greek).
8. V. Matsis, H. Grigoropoulou (2001) “Odor emission in a small wastewater treatment plant” 7th International Conference on Environmental Science and Technology, pp. 323-331, Ermoupolis, Syros island, Greece.
9. V. Matsis, H. Grigoropoulou (2002) “Odor measurement and modeling in a small wastewater treatment plant” 3rd World Water Congress of the International Water Assosiation, Melbourne, Australia.
10. D. Georgantas, H. Grigoropoulou (2002) “Phosphorus removal from municipal wastewater using spent alum sludge” 5th Congress of Chemistry Dept., 25 Years of the Chemistry Department of University of Ioannina (1977-2002) “Basic and Applied Chemistry Research” Ioannina, Greece: O43 (in greek)
11. D. Georgantas, H. Grigoropoulou (2002) “Phosphorus removal from municipal wastewater using spent alum sludge” 4th International Forum and Congress for Environmental Technology Heleco’03, Τechnical Chamber of Greece, Athens Vol. A: 189-195 (in greek).
12. D.A. Georgantas, H.P. Grigoropoulou (2003) “Phosphorus removal from synthetic wastewater using spent alum sludge” 8th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Lemnos Island, Greece, vol. of abstracts: 70. Full paper vol.A: 245-252.
13. V. M. Matsis, H.P. Grigoropoulou (2003) “Removal of odorous compounds in wastewater with a stripping process” 8th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Lemnos Island, Greece, vol. of abstracts: 163. vol.B: 550-557.
14. D.G. Psalidas, V. Thomos, D.A. Georgantas, H.P. Grigoropoulou (2004) “Septic wastewater coagulation using spent lime: application and comparison to other coagulants” IWA World Water Congress and Exhibition, Marrakesh.  
15. D.A. Georgantas, H.P. Grigoropoulou (2004) “Phosphorus removal from synthetic and municipal wastewater using spent alum sludge. Comparison to other coagulants” IWA World Water Congress and Exhibition, Marrakesh.
16. D.A. Georgantas, H.P. Grigoropoulou (2005) “Phosphorus and organic matter removal from synthetic wastewater using alum and aluminum hydroxide” 9th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Rhodes Island, Greece, vol.A: 465-470.
17. D.A. Georgantas, H.P. Grigoropoulou (2005) “Using spent alum sludge to remove phosphorus from synthetic wastewater – Application, kinetics and equilibrium studies” Water and Wastewater Europe 2005, Milan.
18. D. A. Georgantas, H.P. Grigoropoulou (2006) “Phosphorus removal from synthetic wastewater using alum and aluminium hydroxide” Protection and Restoration of the Environment VII, Chania, Crete, July 3-7: 233-234.
19. P. Karka, D.F. Lekkas, E. Grigoropoulou, D. Assimacopoulos (2006) “Stochastic modeling of organic material in urban waste water systems”  AQUA 2006 Water Science and Technology Integrated Management of Water Resources, Athens 23-26/11.
20. E. Alexopoulou, E. Grigoropoulou, “On-site treatment and reuse of greywater in residencies and tourist complexes”, AQUA 2008, 16-19/10

Catalytic oxidation of pollutants in gaseous and aqueous phase

1. Κ. Pezou, H. Grigoropoulou (1989) “Ethanol as additive to vehicle fuels” Proceedings of the First Conference on Environmental Science and Technology, vol.A, pp. 30 - 41, University of the Aegean, Environmental Department, Mitilini, Greece (in greek).
2. Ν. Papageorghiou, H. Grigoropoulou (1995) “Homogeneous catalytic oxidation of phenol in aqueous solution, Proceedings of the Fourth Conference on Environmental Science and Technology, pp. 407 - 415, University of the Aegean, Environmental Department, Mitilini, Greece (in greek).
3. H. Grigoropoulou, C. Philippopoulos (1995) “Catalytic treatment of emissions from conventional and alternative fuels for car operation” Proceedings of the Fourth Conference on Environmental Science and Technology, vol.B, pp. 409 - 415, University of the Aegean, Environmental Department, Mitilini, Greece (in greek).
4. J. Karafyllis, C. Philippopoulos, H. Grigoropoulou (1995) “Oxidation of Unburned Ethanol over Cu/Al2O3 Catalyst” pp. 379-383, Proc. 1st World Conference on Environmental Catalysis, Pisa, Italy.
5. S.G. Poulopoulos, H.P. Grigoropoulou, C.J. Philippopoulos (1996) “Solar Irradiation of Chlorophenols Aqueous Solutions in the Presence of H2O2 and TiO2 powders” Proceedings of the 2nd Specialized Conference on Pretreatment of Industrial Wastewaters, IAWQ, pp. 217 - 224.
6. H.P. Grigoropoulou, C.J. Philippopoulos (1996) “Homogeneous Oxidation of Phenols in Aqueous Solution with Hydrogen Peroxide and Ferric Ions” Proceedings of the 2nd Specialized Conference on Pretreatment of Industrial Wastewaters, IAWQ, pp. 804 - 807.
7. H. Grigoropoulou, C. Philippopoulos, A. Kallinikos. S. Poulopoulos (1997) “The Effect of the Addition of Ceria to Cu/Al2O3 Catalyst on the Oxidation of Ethanol” Proceedings of the First Panhellenic Congress on Chemical Engineering, pp.975 - 980, Dept. of Chem. Eng., University of Patras (in greek).
8. H. Grigoropoulou, C. Philippopoulos, A. Kallinikos. S. Poulopoulos (1997) “The Effect of the Addition of Ceria to Cu/Al2O3 Catalyst on the Oxidation of Ethanol” First European Congress on Chemical Engineering - ECCE1, Firenze, Italy, 2183-2186.
9. Μ. Νaoum, H. Grigoropoulou (2000) “Catalytic decomposition of hydrogen peroxide on iron oxide” 6th Panhellenic Symposium on Catalysis, pp. 220-225, Delfi, Greece (in greek).
10. D. Psilopoulos, H. Grigoropoulou (2003) “Hydrogen peroxide decomposition in the presence of solid FeOOH” 4th Panhellenic Congress of Chemical Engineering, Patras, Greece  441-444  (in greek).
11. K. Tzortzatou, H. Grigoropoulou (2007) “Catalytic oxidation of VOCs” 6th Panhellenic Congress of Chemical Engineering, Athens, Greece  889-892  (in greek).
12. K. Tzortzatou, E. Grigoropoulou (2008) “Catalytic oxidation of VOCs” 10th Panhellenic Symposium on Catalysis, Metsovo, Greece (in greek).
13. K. Tzortzatou, H. P. Grigoropoulou (2009) “Catalytic oxidation of VOCs on CuO/γ-Al2O3” 7th Panhellenic Congress of Chemical Engineering, Athens, Greece  (in greek).

Ion exchange on natural zeolites

1. V. J. Inglezakis, M.D. Loizidou, H. Grigoropoulou (1999) “Effects of dust on on physical and ion exchange properties of natural clinoptilolite” pp. 422-430, 6th International Conference on Environmental Science and Technology, Samos island, Greece (in greek).
2. V.J. Inglezakis, M.D. Loizidou, H.P. Grigoropoulou (2001) “Pretreatment of clinoptilolite in ion exchange packed beds” pp. 356-364. 7th International Conference on Environmental Science and Technology, Syros island, Greece.
3. V.J.Inglezakis, A.A.Zorpas, M.D. Loizidou, H.P.Grigoropoulou (2002) “Simltaneous Removal of Metals Cu2+, Fe3+ and Cr3+ with Anions SO2-4 and HPO42- Using Clinoptilolite” 6th Int. Conf. On the Occurrence, Properties and Utilization of Natural Zeolites (Zeolite ’02), IZA, Thessaloniki, Greece, June 3-7: 142-143.
4. V.J.Inglezakis, H.P.Grigoropoulou (2002) “Modeling of lead ion exchange in packed beds of clinoptilolite” 6th Int. Conf. On the Occurrence, Properties and Utilization of Natural Zeolites (Zeolite ’02), IZA, Thessaloniki, Greece, June 3-7: 144-145.
5. V. Inglezakis, H. Grigoropoulou, A. Zorpas, D. Arapoglou (2002) “The use of tracing techniques for the evaluation of liquid holdup and appropriate volumetric flow rates for ion exchange in zeolite beds” 5th Int. Scientific and Technical Conference “Water Supply and Water Quality”, Poznan-Gdansk, Poland, July 26-28: 429-440.
6. Α. Zorpas, V. Inglezakis, D. Arapoglou, P. Karlis, S. Petrou, H. Grigoropoulou, M. Loizidou (2002) “The affect of particle size of clinoptilolite on heavy metals uptake from sewage sludge compost and how the particle size affect the metal uptake from barley cultivation” Int. Conf “Protection and Restauration of the Environment VI”, Skiathos, Greece, July 1-5: 1223-1229.
7. V. J. Inglezakis, M. D. Loizidou, H.P. Grigoropoulou (2003) “Removal of Pb2+ and Cr3+ using natural and modified clinoptilolite” 4th Panhellenic Congress of Chemical Engineering, Patras, Greece:1021-1024 (in greek).
8. V. J. Inglezakis, M.D. Loizidou, H.P. Grigoropoulou (2003) “Pb2+ removal from liquid phase using a chelating resin: the effect of operating variables and application of the shrinking core model” 8th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Lemnos Island, Greece, vol. of abstracts: 69. Full paper vol.A: 341-348.
9. V. J. Inglezakis, M.D. Loizidou, H.P. Grigoropoulou (2003) “Short-cut design of ion-exchange and adsorption fixed bed operations for wastewater treatment” 8th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Lemnos Island, Greece, vol. of abstracts: 159. Full paper vol.B: 317-324.
10. V.J. Inglezakis, M. Stylianou, M.D. Loizidou, H.P. Grigoropoulou (2005) “Ion exchange in polar organic solvents: zeolite-heavy metals case” 9th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Rhodes Island, Greece, vol.A: 606-613.
11. Y. Petrakakis, E. Mylona, D. Georgantas, H. Grigoropoulou (2006) “Leaching of lead from clinoptilolite at acidic conditions” Protection and Restoration of the Environment VII, Chania, Crete, July 3-7: 441-442.

Sorption/desorption of compounds and ionic species

1. K. Elaiopoulos, H. Grigoropoulou (2002) “Adsorption of toluene on natural and modified clinoptilolite” 6th Int. Conf. On the Occurrence, Properties and Utilization of Natural Zeolites (Zeolite ’02), IZA, Thessaloniki, Greece, June 3-7: 88-89.
2. V. Matsis, H. Grigoropoulou (2002) “Odorous compounds: presence – analytical methods – stripping process" 5th Congress of Chemistry Dept., 25 Years of the Chemistry Department of University of Ioannina (1977-2002) “Basic and Applied Chemistry Research” Ioannina, Greece: O33 (in greek).
3. V. M. Matsis, H.P. Grigoropoulou (2003) “Removal of odorous compounds in wastewater with a stripping process” 8th International Conference on Environmental Science and Technology,University of the Aegean, Dept. of Environmental Studies, Lemnos Island, Greece, vol. of abstracts: 163. vol.B: 550-557.
4. E. Kouvelos, T. Steriotis, N. Kanelopoulos, E. Kikinides, H. Grigoropoulou (2003) “Characterization of clinoptilolites for use in natural gas enrichment processes” 4th Panhellenic Congress on Chemical Engineering, Patras, Greece, 917-920 (in greek).
5. K. Elaiopoulos, H. Grigoropoulou (2005) “Characterization of greek natural zeolite, dealumination and toluene adsorption” 5th Panhellenic Congress on Chemical Engineering, Thessaloniki, Greece  377-380 (in greek).
6. V. Matsis, H. Grigoropoulou (2005) “Stripping process of an odorous compound in neutral and alkaline medium” 5th Panhellenic Congress on Chemical Engineering, Thessaloniki, Greece 1097-1100 (in greek).
7. V. Matsis, H. Grigoropoulou (2005) “Stripping process of an odor compound: theoretical and experimental study” 7th World Congress of Chemical Engineering, Glascow, Scotland, 10-14 July, C17-005.
8. V.M. Matsis, H.P. Grigoropoulou (2005) “Aeration/stripping of 1-butylmercaptan in aqueous environment” 9th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Rhodes Island, Greece, vol.A: 959-965.
9. D. A. Georgantas, H. P. Grigoropoulou (2005) “Phosphorus removal from solution with spent alum sludge” 5th Panhellenic Congress on Chemical Engineering, Thessaloniki, Greece 97-100 (in greek).
10. Α. Koulikourdis, E. Paspatis. H. Grigoropoulou (2005) “Red mud residue application to soil: phytotoxicity assessment” 9th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Rhodes Island, Greece, vol.B: 467-472.
11. Vasileios M. Matsis, Helen P. Grigoropoulou (2006) “Dissolved oxygen sorption on granular activated carbon” CHISA 2006, 17th International Congress of Chemical and Process Engineering, Prague, Czech Republic, 27-31 August: B7-05, 310-311.
12. K. Elaiopoulos, Th. Perraki, E. Grigoropoulou (2006) “Determination and characterization of a greek natural zeolite. Dealumination and toluene adsorption” XXIX Annual British Zeolite Association Conference, Ambleside, United Kingdom, 30 July-4 August. 
13. V. M. Matsis, H. P. Grigoropoulou (2007) “Soprtion of dissolved oxygen on activated carbon” 6th Panhellenic Congress on Chemical Engineering, Athens, Greece: 765-768 (in greek).
14. V.M. Matsis, H.P. Grigoropoulou (2007) “Interaction of activated carbon and dissolved oxygen” 10th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Kos Island, Greece, 5-7/9.
15. D.A. Georgantas, H.P. Grigoropoulou (2007) “NOM removal from aqueous solution using alum and polymeric aluminum hydroxide” 1st International Conference on Environmental Management, Engineering, Planning and Economics (CEMEPE), Skiathos Island, Greece, 24-28/6: 1243-1248.
16. J. Poulios, H. Grigoropoulou (2009) “Sorption of orthophosphate ions on red mud” 7th Panhellenic Congress on Chemical Engineering, Patras, Greece (in greek).
17. K. Elaiopoulos, K. Salmas, H. Grigoropoulou (2009) “Prediction of adsorption isotherms of VOCs on mesoporous materials through the CPSM model” 7th Panhellenic Congress on Chemical Engineering, Patras, Greece (in greek).
18. K. Elaiopoulos, H. Grigoropoulou (2009) “Tracing procedure in lab-scale fixed beds with a measuring device of significant time-delay”, 7th Panhellenic Congress on Chemical Engineering, Patras, Greece (in greek).
19. V. Matsis, H. Grigoropoulou, “Adsorption of n-Butyl Mercaptan from aqueous solutions on activated carbon” 11th International Conference on Environmental Science and Technology, University of the Aegean, Dept. of Environmental Studies, Chania 2009, A-892 – A-898.
20. K. Elaiopoulos, E. Grigoropoulou, K. Salmas (2010) “Prediction of adsorption isotherms of volatile organic compounds vapors on mesoporous materials through the CPSModel”  CHISA 2010 – ECCE 7 Prague, P3.213