Journal of Environmental Science and Technology1994-78872077-2181Asian Network for Scientific Information10.3923/jest.2017.49.55MostafaiiGholamreza ChimehiElahe GilasiHamidReza IranshahiLeila 12017101Background: One of the problems of rapid population growth is contamination of water resources by wastewater. Wastewater may contain microbial contaminants such as total coliform bacteria that can be a threat to the public health. Zinc oxide nanoparticles effects on removal of total coliform bacteria from the activated sludge process effluent of municipal wastewater was investigated. Materials and Methods: The samples were taken from the effluent of the secondary sedimentation tank of wastewater treatment plant. After cultivation of the samples by multiple tube fermentation method, the total coliform rate was evaluated by MPN table. Different concentrations of ZnO nanoparticles were applied and in different contact times, the efficiency of total coliform removal rate was calculated. Results: Findings showed that ZnO nanoparticles could remove 100% of total coliform in municipal activated sludge effluent in concentration of 1.1 g L1 in 90 min contact time. Also, total coliform removal percentage showed a significant difference in 20 min with that of 40, 60 and 90 min (p<0.001). No significant relation was seen in the concentration of ZnO nanoparticles with the removal efficiency (p>0.05). Conclusion: The results show that ZnO nanoparticles are a proper antibacterial for removing total coliform bacteria from municipal wastewater effluent and application of ZnO nanoparticles as a disinfectant for removing total coliform bacteria can be studied further.]]>Hummel, D.O.,2000pp: 18-25pp: 18-25Tchobanoglous, G. and F.L. Burton,19913rd Edn.,Pages: 1334Pages: 1334Pant, A. and A.K. Mittal,200728717722Tiwari, D.K., J. Behari and P. Sen,20083417433Noroozi, R. and M.H. Mehdinezhad,2011Escherichia coli by ZnO activated by ultraviolet-C light from aqueous solution.]]>55261Li, Q., S. Mahendra, D.Y. Lyon, L. Brunel and M.V. Liga et al.,20084245914602Masoumbeigi, H., A. Rezaee, A. Khataee and S.J. Hashemian,2010E. coli using immobilized ZnO nanoparticles.]]>14149156Sirianuntapiboon, S., K. Chairattanawan and M. Rarunroeng,2008154526534Tyagi, P.K., R. Singh, S. Vats, D. Kumar and S. Tyagi,20122012pp: 6569Jones, N., B. Ray, K.T. Ranjit and A.C. Manna,20082797176Qiao, Y., A. Do, D. Yeh and M.J. Watts,201435145153Miranzadeh, M.B., D. Rabbani, S. Naseri, R. Nabizadeh, S.G.A. Mousavi and F. Ghadami,2012163135Malakootian, M. and A. Toolabi,20102 and ZnO in removing gram positive and negative bacteria from wastewater.]]>9110Brayner, R., R. Ferrari-Iliou, N. Brivois, S. Djediat, M.F. Benedetti and F. Fievet,2006Escherichia coli bacteria in ultrafine ZnO nanoparticles colloidal medium.]]>6866870Hrenovic, J., J. Milenkovic, N. Daneu, R.M. Kepcija and N. Rajic,20128811031107Rice, E.W. and L. Bridgewater,201222nd Edn.,Pages: 724Pages: 724Qian, Y., J. Yao, M. Russel, K. Chen and X. Wang,2015A. vera) and their antibacterial activity against pathogens.]]>39736746Alikhani, M.Y., S.M. Lee, J.K. Yang, M. Shirzad-Siboni and H. Peeri-Dogaheh et al.,2013Escherichia coli from aquatic solutions using synthesized ZnO nanoparticles: A kinetic study.]]>67557563Jalal, R., E.K. Goharshadi, M. Abareshi, M. Moosavi, A. Yousefi and P. Nancarrow,2010121198201Hossain, F., O.J. Perales-Perez, S. Hwang and F. Roman,201446610471059Adams, L.K., D.Y. Lyon and P.J.J. Alvarez,20062, SiO2 and ZnO water suspensions.]]>4035273532Zhang, L., Y. Ding, M. Povey and D. York,200818939944Franklin, N.M., N.J. Rogers, S.C. Apte, G.E. Batley, G.E. Gadd and P.S. Casey,20072 to a freshwater microalga (Pseudokirchneriella subcapitata): The importance of particle solubility.]]>4184848490Padmavathy, N. and R. Vijayaraghavan,20082008Roselli, M., A. Finamore, I. Garaguso, M.S. Britti and E. Mengheri,2003Escherichia coli.]]>13340774082