JWARP  Vol.9 No.5 , April 2017
Micropollutant Removal from Water by Membrane and Advanced Oxidation Processes—A Review
Abstract: Micropollutants are defined as contaminants found in trace concentrations in water bodies that are persistent and bioactive, meaning they are not completely biodegradable and cannot be removed by conventional water treatment methods. Because of these aspects, their detection and removal pose a challenge to the scientific community. Among them are endocrine disruptors, drugs, agricultural chemicals, personal grooming products, industrial additives and others. These micropollutants are the cause for global concern, because their presence in water supply systems is suspected of causing health problems in humans and animals. To develop efficient techniques to remove them, it is fundamental to understand their physico-chemical properties and the available treatment types and conditions. Membrane separation processes (MSPs) and advanced oxidation processes (AOPs) are the focus of this literature review, as potential treatment methods to remove micropollutants. The former process stands out for high rejection rates (above 90%) of various micropollutants, but it generates a concentrated secondary waste stream. In turn, the latter process can remove micropollutants without generating secondary wastes, and can also be applied and combined with other treatment methods.
Keywords: Micropollutants, MSP, AOP
Cite this paper: Silva, L. , Moreira, C. , Curzio, B. and da Fonseca, F. (2017) Micropollutant Removal from Water by Membrane and Advanced Oxidation Processes—A Review. Journal of Water Resource and Protection, 9, 411-431. doi: 10.4236/jwarp.2017.95027.

[1]   USEPA (2016) What’s Endocrine Disruption?

[2]   Birkett, J.W. and Lester, J.N. (2003) Endocrine Disrupters in Wastewater and Sludge Treatment Processes. Lewis Publishers, London, England.

[3]   Baird, C. and Cann, M. (2011) Química Ambiental. 4th Edition, Bookman, Porto Alegre.

[4]   Luo, Y., Guo, W., Ngo, H.H., Nghiemb, L.D., Hai, F.I., Zhang, J., Liang, S. and Wang, X.C. (2014) A Review on the Occurrence of Micropollutants in the Aquatic Environment and Their Fate and Removal during Wastewater Treatment. Science of the Total Environment, 473, 619-641.

[5]   Hamid, H. and Eskicioglu, C. (2012) Fate of Estrogenic Hormones in Wastewater and Sludge Treatment: A Review of Properties and Analytical Detection Techniques in Sludge Matrix. WaterResource, 46, 5813-5833.

[6]   Bila, D.M. and Dezotti, M. (2003) Fármacos no meio ambiente. Química Nova, 26, 523-530.

[7]   Bila, D.M. and Dezotti, M. (2007) Desreguladores endócrinos no ambiente: Efeitos e consequências. Química Nova, 30, 651-666.

[8]   Manahan, S.E. (2005) Environmental Chemistry. 8th Edition, CRC Press LLC, New York.

[9]   Souza, N.C. (2011) Avaliacao de micropoluentes emergentes em esgotos e águas superficiais (Assessment of Emerging Micropollutants in Sewage and Surface Water). Dissertation, Federal University of Ceará, Ceará (CE).

[10]   Bolong Bolong, N., Ismail, A.F., Salim, M.R. and Matsuura, T. (2009) A Review of the Effects of Emerging Contaminants in Wastewater and Options of Their Removal. Desalination, 239, 229-246.

[11]   Nath, K. (2008) Membrane Separation Processes. PHI Learning Pvt. Ltd., New Delhi.

[12]   Baker, R.W. (2004) Membrane Technology and Applications. 2nd Edition, John Wiley & Sons, Ltd., Hoboken.

[13]   Mallevialle, J., Odendaal, P.E. and Wiesner, M.R. (1996) Water Treatment Membrane Processes. LyonnaisedesEaux-LdE, New York.

[14]   Harbert, A.C., Borges, C.P. and Nobrega, R. (2003) Processos de Separacao com Membranas [Membrane Separation Processes]. E-papers, Rio de Janeiro.

[15]   Sui, Q., Huang, J., Deng, S., Yu, G. and Fan, Q. (2010) Occurrence and Removal of Pharmaceuticals, Caffeine and DEET in Wastewater Treatment Plants of Beijing, China. Water Research, 44, 417-426.

[16]   Yangali-Quintanilla, V., Maeng, S.K., Fujioka, T., Kennedy, M. and Amy, G. (2010) Proposing Nanofiltration as Acceptable Barrier for Organic Contaminants in Water Reuse. Journal of Membrane Science, 362, 334-345.

[17]   Cartagena, P., Kaddouri, M.E., Cases, V., Trapote, A. and Prats, D. (2013) Reduction of Emerging Micropollutants, Organic Matter, Nutrients and Salinity from Real Wastewater by Combined MBR-NF/RO Treatment. Separation and Purification Technology, 110, 132-143.

[18]   Liu, P., Zhang, H., Feng, Y., Yang, F. and Zhang, J. (2014) Removal of Trace Antibiotics from Wastewater: A Systematic Study of Nanofiltration Combined with Ozone-Based Advanced Oxidation Processes. Chemical Engineering Journal, 240, 211-220.

[19]   Chon, K., Kyong Shon, H. and Cho, J. (2012) Membrane Bioreactor and Nanofiltration Hybrid System for Reclamation of Municipal Wastewater: Removal of Nutrients, Organic Matter and Micropollutants. Bioresource Technology, 122, 181-188.

[20]   Simon, A., Nghiem, L.D., Le-Clech, P., Khan, S.J. and Drewes, J.E. (2009) Effects of Membrane Degradation on the Removal of Pharmaceutically Active Compounds (PhACs) by NF/RO Filtration Processes. Journal of Membrane Science, 340, 16-25.

[21]   Shanmuganathan, S., Johir, M.A., Nguyen, T.V., Kandasamy, J. and Vigneswaran, S. (2015) Experimental Evaluation Microfiltration-Granular Activated Carbon (MF-GAC)/Nano Filter Hybrid System in High Quality Water Reuse. Journal of Membrane Science, 476, 1-9.

[22]   Sahar, E., David, I., Gelman, Y., Chikurel, H., Aharoni, A., Messalem, R. and Brenner, A. (2011) The Use of RO to Remove Emerging Micropollutants Following CAS/UF or MBR Treatment of Municipal Wastewater. Desalination, 273, 142-147.

[23]   Dolar, D., Gros, M., Rodriguez-Mozaz, S., Moreno, J., Comas, J., Rodriguez-Roda, I. and Barceló, D. (2012) Removal of Emerging Contaminants from Municipal Wastewater with an Integrated Membrane System, MBR-RO. Journal of Hazardous Materials, 239, 64-69.

[24]   Gur-Reznik, S., Koren-Menashe, I., Heller-Grossman, L., Rufel, O. and Dosoretz, C.G. (2011) Influence of Seasonal and Operating Conditions on the Rejection of Pharmaceuticals Active Compounds by RO and NF Membranes. Desalination, 277, 250-256.

[25]   Linares, R.V., Yangali-Quintanilla, V., Li, Z. and Amy, G. (2011) Rejection of Micropollutants by Clean and Fouled forward Osmosis Membrane. Water Research, 45, 6737-6744.

[26]   Chon, K., Cho, J. and Shon, H.K. (2013) A Pilot-Scale Hybrid Municipal Wastewater Reclamation System Using Combined Coagulation and Disc Filtration, Ultrafiltration and Reverse Osmosis: Removal of Nutrients and Micropollutants, and Characterization of Membrane Foulants. Bioresource Technology, 141, 109-116.

[27]   Yangali-Quintanilla, V., Sadmani, A., McConville, M., Kennedy, M. and Amy, G. (2009) Rejection of Pharmaceutically Active Compounds and Endocrine Disrupting Compounds by Clean and Fouled Nanofiltration Membranes. Water Research, 43, 2349-2362.

[28]   Garcia, N., Moreno, J., Cartmell, E., Rodriguez-Roda, I. and Judd, S. (2013) The Application of Microfiltration-Reverse Osmosis/Nanofiltration to Trace Organics Removal for Municipal Wastewater Reuse. Environmental Technology, 34, 3183-3189.

[29]   Rodriguez-Mozaz, S., Ricart, M., Kock-Schulmeyer, M., Guasch, H., Bonnineau, C., Proia, L., Alda, M.L., Sabater, S. and Barceló, D. (2015) Pharmaceuticals and Pesticides in Reclaimed Water: Efficient Assessment of a Microfiltration-Reverse Osmosis (MF-RO) Pilot Plant. Journal of Hazardous Materials, 282, 165-173.

[30]   Huang, H., Cho, H., Schwab, K. and Jacangelo, J.G. (2011) Effects of Feedwater Pretreatment on the Removal of Organic Microconstituents by a Low Fouling Reverse Osmosis Membrane. Desalination, 281, 446-454.

[31]   Lee, C.O., Howe, K.J. and Thomson, B.M. (2012) Ozone and Biofiltration as an Alternative to Reverse Osmosis for Removing PPCPs and Micropollutants from Treated Wastewater. Water Research, 46, 1005-1014.

[32]   Sadmani, A.A., Andrews, R.C. and Bagley, D.M. (2014) Influence of Naturally Occurring Dissolved Organic Matter, Colloids and Cations on Nanofiltration of Pharmaceutically Active and Endocrine Disrupting Compounds. Chemosphere, 117, 170-177.

[33]   Sanches, S., Galinha, C.F., Crespo, M.T., Pereira, V.J. and Crespo, J.G. (2013) Assessment of Phenomena Underlying the Removal of Micropollutants during Water Treatment by Nanofiltration Using Multivariate Statistical Analysis. Separation and Purification Technology, 118, 377-386.

[34]   Sanches, S., Penetra, A., Rodrigues, A., Cardoso, V.V., Ferreira, E., Benoliel, M.J., Barreto Crespo, M.T., Crespo, J.G. and Pereira, V.J. (2013) Removal of Pesticides from Water Combining Low Pressure UV Photolysis with Nanofiltratio. Separation and Purification Technology, 115, 73-82.

[35]   Porter, M.C. (1998) Handbook of Industrial Membrane Technology. Noyes Publications.

[36]   Noble, R.D. and Stern, S.A. (1999) Membrane Separations Technology: Principles and Applications. 2nd Edition, Elsevier, Amsterdam.

[37]   Li, N.N., Fane, A.G., Winston, W.S. and Matsuura, T. (2008) Advanced Membrane Technology and Applications. John Wiley & Sons, Inc., Hoboken.

[38]   Klüpfel, A.M. and Frimmel, F.H. (2010) Nanofiltration of River Water—Fouling, Cleaning and Micropollutant Rejection. Desalination, 250, 1005-1007.

[39]   Kaminska, G., Bohdziewicz, J., Calvo, J.I., Prádanos, P., Palacio, L. and Hernandéz, A. (2015) Fabrication and Characterization of Polyethersulfone Nanocomposite Membranes for the Removal of Endocrine Disrupting Micropollutants from Wastewater. Mechanisms and Performance. Membrane Science, 493, 66-79.

[40]   Al-Rifai, J.H., Khabbazb, H. and Schaferc, A.I. (2011) Removal of Pharmaceuticals and Endocrine Disrupting Compounds in a Water Recycling Processes Using Reverse Osmosis System. Separation and Purification Technology, 77, 60-67.

[41]   Nogueira, R.F.P. and Jardim, W.F. (1998) A fotocatálise heterogênea e sua aplicacao ambiental. Química Nova, 21, 69-72.

[42]   Esplugas, S., Bila, D.M., Krause, L.G.T. and Dezotti, M. (2007) Ozonation and Advanced Oxidation Technologies to Remove Endocrine Disrupting Chemicals (ED-Cs) and Pharmaceuticals and Personal Care Products (PPCPs) in Water Effluents. Journal of Hazardous Materials, 149, 631-642.

[43]   Kommineni, S., Zoeckler, J., Stocking, A., et al. (2000) Chapter 3. Advanced Oxidation Process. In: Treatment Technologies for Removal of Methyl Tertiary Butyl Ether (MTBE) from Drinking Water: Air Stripping, Advanced Oxidation Processes, Granular Activated Carbon and Synthetic Resins Adsorbents, 2nd Edition, National Water Research Institute, Fountain Valley, California, 109-208.

[44]   Oxidation Handbook (1994) Solarchem Environmental System. Ontario.

[45]   Assalin, M.R. and Durán, N. (2006) Novas tendências para aplicacao de oznio no tratamento de residuos: ozonizacao catalítica [New Trends for Ozone Application in the Treatment of Waste: Catalytic Ozonation]. Revista Analytica, 26, 76-78.

[46]   Mahmoud, A. and Freire, R.S. (2007) Métodos emergentes para aumentar a eficiência do oznio no tratamento de águas contaminadas [Emerging Methods to Increase the Efficiency of Ozone in Wastewater Treatment]. Química Nova, 30, 198-205.

[47]   Choi, K.J., Kim, S.G., Kim, C.W. and Park, J.K. (2006) Removal Efficiencies of Endocrine Disrupting Chemicals by Coagulation/Flocculation, Ozonation, Powdered/ Granular Activated Carbon Adsorption, and Chlorination. Korean Journal of Chemical Engineering, 23, 399-408.

[48]   Gerrity, D., Gamage, S., Holady, J.C., Mawhinney, D.B., Quiñones, O., Trenholm, R.A. and Snyder, S.A. (2011) Pilot-Scale Evaluation by Ozone and Biological Activated Carbon for Trace Organic Contaminant Mitigation and Disinfection. Water Research, 45, 2155-2165.

[49]   Lee, Y., Kovalova, L., McArdell, C.S. and Gunten, U.S. (2014) Prediction of Micropollutant Elimination during Ozonation of a Hospital Wastewater Effluent. Water Research, 64, 134-148.

[50]   Nakada, N., Shinohara, H., Murata, A., Kiri, K., Managaki, S., Sato, N. and Takada, H. (2007) Removal of Selected Pharmaceuticals and Personal Care Products (PP-CPs) and Endocrine-Disrupting Chemicals (EDCs) during Sand Filtration and Ozonation at a Municipal Sewage Treatment Plant. Water Research, 41, 4373-4382.

[51]   Munter, R. (2001) Advanced Oxidation Processes—Current Status and Prospects. Proceedings of the Estonian Academy of Sciences, 50, 59-80.

[52]   Pereira, V.J., Galinha, J., Crespo, M.T.B., Matos, C. and Crespo, J. (2012) Integration of Nanofiltration, UV Photolysis, and Advanced Oxidation Processes for the Removal of Hormones from Surface Water Sources. Separation and Purification Technology, 95, 89-96.

[53]   Souissi, Y., Bourcier, S., Bouchonnet, S., Genty, C. and Sablier, M. (2012) Estrone Direct Photolysis: By-Product Identification Using LC-Q-TOF. Chemosphere, 87, 185-193.

[54]   Carlson, J.C., Stefan, M.I., Parnis, J.M. and Metcalf, C.D. (2015) Direct UV Photolysis of Select Pharmaceuticals, Personal Care Products and Endocrine Disruptors in Aqueous Solution. Water Research, 84, 350-361.

[55]   Chen, H., Bramanti, E., Longo, I., Onor, M. and Ferrari, C. (2011) Oxidative Decomposition of Atrazine in Water in the Presence of Hydrogen Peroxide Using an Innovate Microwave Photochemical Reactor. Journal of Hazardous Materials, 186, 1808-1815.

[56]   De la Cruz, N., Giménez, J., Esplugas, S., Grandjean, D., Alencastro, L.F. and Pulgarín, C. (2012) Degradation of 32 Emerging Contaminants by UV and Neutral Photo-Fenton in Domestic Wastewater Effluent Previously Treated by Activated Sludge. Water Research, 46, 1947-1957.

[57]   Han, O., Wang, H., Dong, W., Liu, T., Yin, Y. and Fan, H. (2015) Degradation of Bisphenol A by Ferrate(VI) Oxidation: Kinetics, Products and Toxicity Assessment. Chemical Engineering Journal, 262, 34-40.

[58]   Hernández-Leal, L., Temmink, H., Zeeman, G. and Buisman, C.J.N. (2011) Removal of Micropollutants of Aerobically Treated Grey Water via Ozone and Activated Carbon. Water Research, 45, 2887-2896.

[59]   Ibañez, M., Gracia-Lor, E., Bijlsma, L., Morales, E., Pastor, L. and Hernández, F. (2013) Removal Emerging Contaminants in Sewage Water Subjected to Advanced Oxidation with Ozone. Journal of Hazardous Materials, 260, 389-398.

[60]   Kim, I., Yamashita, N. and Tanaka, H. (2009) Performance of UV and UV/H2O2 Processes for the Removal of Pharmaceuticals Detected in Secondary Effluent of a Sewage Treatment Plant in Japan. Journal of Hazardous Materials, 166, 1134-1140.

[61]   Kusvuran, E. and Yildirim, D. (2013) Degradation of Bisphenol A by Ozonation and Determination of Degradation Intermediates by Gas Chromatograph-Mass Spectrometry and Liquid Chromatograph-Mass Spectrometry. Chemical Engineering Journal, 220, 6-14.

[62]   Kwon, M., Kim, S., Yoon, Y., Jung, Y., Hwang, T.M., Lee, J. and Kang, J.W. (2015) Comparative Evaluation of Ibuprofen Removal by UV/H2O2 and UV/S2O82- Processes for Wastewater Treatment. Chemical Engineering Journal, 269, 379-390.

[63]   Laat, J., Gallard, H., Ancelin, S. and Legube, B. (1999) Comparative Study of the Oxidation of Atrazine and Acetone by H2O2/UV, Fe(III)/UV, Fe(III)/H2O2/UV and Fe(II) or Fe(III)/H2O2. Chemosphere, 39, 2693-2706.93.

[64]   Ning, B., Graham, N.J.D. and Zhang, Y. (2007) Degradation of Octylphenol and Nonylphenol by Ozone—Part II: Indirect Reaction. Chemosphere, 68, 1173-1179.

[65]   Oh, B.S., Jung, Y.J., Oh, Y.J., Yoo, Y.S. and Kang, J.W. (2006) Application of Ozone, UV and Ozone/UV Processes to Reduce Diethyl Phthalate and Its Estrogenic Activity. Science of the Total Environment, 367, 681-693.

[66]   Olmez-Hanci, T., Dursun, D., Aydin, E., Arslan-Alaton, I., Girit, B., Mita, L., Diano, N., Mita, D.G. and Guida, M. (2015) /UV-C and H2O2/UV-C Treatment of Bisphenol-A: Assessment of Toxicity, Estrogenic Activity, Degradation Products and Results in Real Water. Chemosphere, 119, S115-S123.

[67]   Richard, J., Boergers, A., Eyser, C.V., Bester, K. and Tuerk, J. (2014) Toxicity of the Micropollutants Bisphenol A, Ciprofloxacin, Metoprolol and Sulfamethoxazole in Water Samples before and after the Oxidative Treatment. International Journal of Hygiene and Environmental Health, 217, 506-514.

[68]   Suri, R.P.S., Singh, T.S. and Abburi, S. (2010) Influence of Alkalinity and Salinity on the Sonochemical Degradation of Estrogen Hormones in Aqueous Solution. Environmental Science & Technology, 44, 1373-1379.

[69]   Sarkar, S., Ali, S., Rehmann, L., Nakhla, G. and Ray, M.B. (2014) Degradation of Estrone in Water and Wastewater by Various Advanced Oxidation Processes. Journal of Hazardous Materials, 278, 16-24.

[70]   Aguinaco, A., Beltrán, F.J., García-Araya, J.F. and Oropesa, A. (2012) Photocatalytic Ozonation to Removal Pharmaceutical Diclofenac from Water: Influence of Variables. Chemical Engineering Journal, 189, 275-282.

[71]   Balci, B., Oturan, N., Cherrier, R. and Oturan, M.A. (2009) Degradation of Atrazine in Aqueous Medium by Electrocatalytically Generated Hydroxyl Radicals. A Kinetic and Mechanistic Study. Water Research, 43, 1924-1934.

[72]   Khan, J.A., He, X., Shah, N.S., Khan, H.M., Hapeshi, E., Fatta-Kassinos, D. and Dionysiou, D.D. (2014) Kinetic and Mechanism Investigation on the Photochemical Degradation of Atrazine with Activated H2O2, S2O82- and HSO5-. Chemical Engineering Journal, 252, 393-403.

[73]   Silva, L.S.S., Sales, J.C.S., Campos, J.C., Bila, D.M. and Fonseca, F.V. (2016) Advanced Oxidative Processes and Membrane Separation for Micropollutant Removal from Biotreated Domestic Wastewater. Environmental Science and Pollution Research, 24, 6329-6338.

[74]   Gebhardt, W. and Schroder, H.F. (2007) Liquid Chromatography-(Tandem) Mass Spectrometry for the Follow-Up of the Elimination of Persistent Pharmaceuticals during Wastewater Treatment Applying Biological Wastewater Treatment and Advanced Oxidation. Journal of Chromatograph A, 1160, 34-43.

[75]   Miralles-Cuevas, S., Arqués, A., Maldonado, M.I., Sánchez-Pérez, J.A. and Rodríguez, S.M. (2013) Combined Nanofiltration and Photo-Fenton Treatment of Water Containing Micropollutants. Chemical Engineering Journal, 224, 89-95.

[76]   James, C.P., Germain, E. and Judd, S. (2014) Micropollutant Removal by Advanced Oxidation of Microfiltered Secondary Effluent for Water Reuse. Separation and Purification Technology, 127, 77-83.

[77]   Lowenberg, J., Zenker, A., Baggenstos, M., Koch, G., Kazner, C. and Wintgens, T. (2014) Comparison of Two PAC/UF Processes for the Removal of Micropollutants from Wastewater Treatment Plant Effluent: Process Performance and Removal Efficiency. Water Research, 56, 26-36.

[78]   Arzate, S., Sánches, J.L.G., Soriano-Molina, P., Lópes, J.L.C., Campos-Mañas, M.C., Agüera, A. and Péres, J.A.S. (2017) Effect of Residence Time on Micropollutant Removal in WWTP Secondary Effluents by Continuous Solar Photo-Fenton Process in Raceway Pond Reactors. Chemical Engineering Journal, 316, 1114-1121.

[79]   Lau, T.K., Chu, W. and Graham, N. (2005) The Degradation of Endocrine Disruptor di-n-butilphthalate by UV Irradiation: A Photolysis and Product Study. Chemosphere, 60, 1045-1053.

[80]   Zhang, Z., Feng, Y., Liu, Y., Sun, Q., Gao, P. and Ren, N. (2010) Kinetic Degradation model and Estrogenicity Changes of EE2 (17α-Ethinylestradiol) in Aqueous Solution by UV and UV/H2O2 Technology. Journal of Hazard Materials, 181, 1127-1133.

[81]   Shu, Z., Bolton, J.R., Belosevic, M. and ElGin, M.G. (2013) Photodegradation of Emerging Micropollutants Using the Medium-Pressure UV/H2O2 Advanced Oxidation Process. Water Research, 47, 2881-2889.

[82]   Yan, C., Nie, M., Yang, Y., Zhou, J., Liu, M., Baalousha, M. and Lead, J.R. (2015) Effect of Colloids on the Occurrence, Distribution and Photolysis of Emerging Organic Contaminants in Wastewaters. Journal of Hazardous Materials, 299, 241-248.

[83]   Shanmuganathan, S., Loganathan, P., Kazner, C., Johir, M.A.H. and Vigneswaran, S. (2017) Submerged Membrane Filtration Adsorption Hybrid System for the Removal of Organic Micropollutants from a Water Reclamation Plant Reverse Osmosis Concentrate. Desalination, 401, 134-141.

[84]   Park, M., Anumol, T., Simon, J., Zraick, F. and Snyder, S.A. (2017) Pre-Ozonation for High Recovery of Nanofiltration (NF) Membrane System: Membrane Fouling Reduction and Trace Organic Compound Attenuation. Journal of Membrane Science, 523, 255-263.

[85]   Schaar, H., Clara, M., Gans, O. and Kreuzinger, N. (2010) Micropollutant Removal during Biological Wastewater Treatment and a Subsequent Ozonation Step. Environmental Pollution, 158, 1399-1404.

[86]   Laoufi, N.A., Hout, S., Tassalit, D., Ounar, A., Djouadi, A., Chekir, N. and Bentahar, F. (2013) Removal of a Persistent Pharmaceutical Micropollutant by UV/TiO2 Process Using an Immobilized Titanium Dioxide Catalyst: Parametric Study. Chemical Engineering Transactions, 32, 1951-1956.

[87]   Plakas, K.V., Sarasidis, V.C., Patsios, S.I., Lambropoulou, D.A. and Karabelas, A.J. (2016) Novel Pilot Scale Continuous Photocatalytic Membrane Reactor for Removal of Organic Micropollutants from Water. Chemical Engineering Journal, 304, 335-343.

[88]   Ahmed, M.M., Brienza, M., Goetz, V. and Chiron, S. (2014) Solar Photo-Fenton Using Peroxymonosulfate for Organic Micropollutants Removal from Domestic Wastewater: Comparison with Heterogeneous TiO2 Photocatalysis. Chemosphere, 117, 256-261.