Wastewater from a municipal wastewater treatment plant (Mexico) was treated by a coagulation-flocculation using natural gums. The residual water was characterized in terms of organic load, and biological contaminants, i.e. total Coliforms (TC), fecal Coliforms (FC) and helminth eggs (HE). The sample has values of 2.8 × 107 MPN/100 ml, 8.48 × 106 MPN/100 ml and 470 HE/L is regarded to TC, FC and HH, respectively. The HE identified in the wastewaters were Diphyllobothrium latum, Ascaris lumbricoides, Hymenolepis nana and Toxocara canis. From several gums, Hydroxypropyl triammonium chloride guar gum (HPTAC-guar) was selected as the most adequate coagulant-flocculant for the class of municipal wastewater (MWW). A diminution of 82% for TC, 94% for FC and 99% for HE was obtained. Besides, the reduction of chemical oxygen demand (COD) and turbidity removals were 46% and 39% respectively. The natural gum mixed with Ca(OH)2, obtained removals of 52% for TC, 100% for HE, 47% for COD and 30% for turbidity.
 P. Mijaylova, L. Torres, E. Ramírez, S. López and L. Cardoso, “Characterization and Coagulation—Flocculation Treatability of Mexico City Wastewater Applying Ferric Chloride and Polymers,” Water Science Technology, Vol. 34, No. 3-4, 1996, pp. 235-247.
 S. Toze, “PCR and the Detection of Microbial Pathogens in Water and Wastewater,” Water Research, Vol. 33, No. 17, 1999, pp. 3545-3556.
 J. A. Barrios, B. Jimenez, O. Gonzalez, G. Salgado, L. Samaria and R. Iturbe, “Faecal Coliforms Destruction and Helmint Eggs in Physical-Chemical Sludges by Acid Means (In Spanish),” Proceedings of the XII FEMISCA National Congress, Morelia, 2000, pp. 683-692.
 S. Capizzi-Banas, M. Deloge, M. Remy and J. Schwartzbrod, “Liming as an Advanced Treatment for Sludge Sanitization: Helminth Eggs Eliminate Ion-Ascaris Eggs as Model,” Water Research, Vol. 38, 2004, pp. 3251-3258.
 B. Jimenez, “Helminth Ova Control in Wastewater and Sludge for Agricultural Reuse,” In: W. O. K. Grabow, Ed., Water Reuse New Paradigm towards Integrated Water Resources Management in Encyclopedia of Biological, Physiological and Health Sciences, Water and Health, II, Life Support System, EOLSS Publishers Co Ltd., UNESCO, 2008, pp. 429-449.
 S. Quinzanos, C. Dahl, R. Strube and R. Mujeriego, “Helmint Eggs Removal by Microscrening for Water Reclamation and Reuse,” Water Science and Technology, Vol. 57, No. 5, 2008, pp. 715-720.
 J. Nouri, A. H. Mahvi, R. Saeedi, K. Dindarloo and M. Rafiee and S. Dobaradaran, “Purification of and Removal Acaris and Fasciola Hepatica Eggs from Drinking Water Using Roughing Filters,” Korean Journal of Chemical Engineering, Vol. 25, No. 3, 2008, pp. 501-504.
 M. von Sperling, V. H. Freire and C. A. de Lemos Chernacaro, “Performance Evaluation of a UASB-Activated Sludge System Treating Municipal Wastewater,” Water Science and Technology, Vol. 43, No. 11, 2001, pp. 323-328.
 E. J. La Mota, E. Silva, A. Bustillos, H. Padron and J. Luque, “Combined Anaerobic/Aerobic Secondary Municipal Wastewater Treatment: Pilot Plant Desmostration of the UASB/Aerobic Solids Contact System,” Journal of Environmental Engineering-ASCE, Vol. 133, No. 4, 2007, pp. 397-403.
 J. Guo, J. Wang, D. Cui, L. Wang, F. Ma, C. Chang and J. Yang, “Application of Bioaugmentation in the Rapid Start-Up and Stable Operation of Biological Processes for Municipal Wastewater Treatment at Low Temperatures,” Bioresource Technology, Vol. 101, No. 17, 2010, pp. 6622-6629.
 R. Reinoso, L. A. Torres and E. Bécares, “Efficiency of Natural Systems for Removal of Bacteria and Pathogenic Parasites from Wastewater,” Science of the Total Environment, Vol. 395, No. 2-3, 2008, pp. 80-86.
 N. Rojas-Valencia, “Research on Ozone Application as Disinfectant and Actions Mechanisms on Wastewater Microorganisms. Science against Microbial Pathogens: Communicating Current Research and Technological Advances,” Microbiology Book Series-Number 3, Vol. 1, FORMATEX (A. Mendez-Vilas Edit), Espana, 2011, pp. 263-271.
 C.-H. Lin, R.-F. Yu, W.-P. Cheng and C.-R. Liu, “Monitoring and Control of UV and UV-TiO2 Disinfections for Municipal Wastewater Reclamation Using Artificial Neural Networks,” Journal of Hazardous Materials, Vol. 209-210, No. 1, 2012, pp. 348-354.
 Z. Bhatti, Q. Mahmood, I. Raja, A. Malik, N. Rachis and D. Wu, “Integrated Chemical Treatment of Municipal Wastewater Using Waste Hydrogen Peroxide and Ultraviolet Light,” Physics and Chemistry of the Earth, Vol. 36, No. 9-11, 2011, pp. 459-464.
 A. Bazer-Bachi, E. Puech-Coste, R. Ben Aim and J. L. Probst, “Modélisationmathé Matique du taux de Coagulant dans une Station de Traitementd_eau,” Revue des Sciences de l_Eau, Vol. 3, No. 4, 1990, pp. 377-397.
 A. Ahmad, S. Wong, T. Teng and A. Zuhairi, “Optimization of Coagulation-Flocculation Process for Pulp and Paper Mill Effluent by Response Surface Methodological Analysis,” Journal of Hazardous Materials, Vol. 145, No. 1-2, 2007, pp. 162-168.
 Y. López-Franco, F. Goycoolea, M. Valdez and A. Calderón de la Barca, “Goma de Mezquite: Una Alternativa al uso Industrial (Mesquite Gum: Analternativeto Industrial Use,” Interciencia, Vol. 31, No. 3, 2006, pp. 183-188.
 S. Carpinteyro-Urbán, J. Yanez and L. Torres, “Coagulation Flocculation of Wastewaters Employing Guar, Locust Bean and Mesquite Gums, as Well as Opuntia Mucilage,” Proceedings of the 2nd IWA Mexico Young Water Professional Conference, Querétaro, 2010.
 L. G. Torres, S. Carpinteyro-Urbán and M. Vaca, “Use of Prosopis Laevigata Seed Gum and Opuntia Ficus-Indica Mucilage for Treatment of Municipal Wastewaters by Coagulation-Flocculation,” Natural Resources, in press, 2011.
 L. G. Torres, S. Carpinteyro-Urbán and L. J. Corzo-Rios, “Use of Annona Diversifolia and A. Muricata Seeds as Source of Natural Coagulant-Flocculant Aids for the Treatment of Wastewaters,” Submitted to Indian Journal of Biotechnology, 2012.
 S. Carpinteyro-Urbán, M. Vaca and L. Torres, “Can Vegetal Biopolymers Work as Coagulant-Flocculant Aids in the Treatment of High-Load Cosmetic Industrial Wastewaters? Submitted to Water, Air and Soil Pollution,” 2012.
 S. Carpinteyro-Urbán, M. Vaca and L. Torres, “Use of Response Surface Methodology in the Optimization of Coagulation-Flocculation of Wastewaters Employing Biopolymers. Submitted to International Journal of Environmental Research,” 2012.
 B. Bina, H. Movahedian and I. Kord, “The Effect of Lime Stabilization on the Microbiological Quality of Sewage Sludge,” Iranian Journal of Environmental Health and Science Engineering, Vol. 1, No. 1, 2004, pp. 34-38.
 SECOFI 2006 NMX-AA-102-SCFI-2006, “Water Quality Detection and Enumeration of Coliform Organisms, Thermotolerant Coliform Organisms and Presumptive Escherichia coli-Membrane Filtration Method. (in Spanish), México,” 2006.
 J. Beltran and J. Sánches, “Improvement of Flocculation Process in Water Treatment by Using Moringa Oleífera Seeds Extract,” Proceedings or the Water & Industry 2011—IWA International Conference, Valladolid, 2011.
 M. I. Aguilar, J. Sáez, M. Lloréns, A. Soler, J. F. Ortuno, V. Messeguer and A. Fuentes, “Improvement of Coagulation—Flocculation Process Using Anionic Polyacrylamide as Coagulant Aid,” Chemosphere, Vol. 58, No. 1, 2005, pp. 47-65