The Effect of Influent Characteristics and Operational Conditions over the Performance and Microbial Community Structure of Partial Nitritation Reactors Rodríguez-Sánchez, Alejandro González Martínez, Alejandro Martínez-Toledo, María Victoria García-Ruiz, María Jesús Osorio Robles, Francisco González López, Jesús Juan Partial nitritation Operational conditions Antibiotic Wastewater Nitrogen is a main contaminant of wastewater worldwide. Novel processes for nitrogen removal have been developed over the last several decades. One of these is the partial nitritation process. This process includes the oxidation of ammonium to nitrite without the generation of nitrate. The partial nitritation process has several advantages over traditional nitrification-denitrification processes for nitrogen removal from wastewaters. In addition, partial nitritation is required for anammox elimination of nitrogen from wastewater. Partial nitritation is affected by operational conditions and substances present in the influent, such as quinolone antibiotics. In this review, the impact that several operational conditions, such as temperature, pH, dissolved oxygen concentration, hydraulic retention time and solids retention time, have over the partial nitritation process is covered. The effect of quinolone antibiotics and other emerging contaminants are discussed. Finally, future perspectives for the partial nitritation process are commented upon. 2014-09-04T06:37:55Z 2014-09-04T06:37:55Z 2014 info:eu-repo/semantics/article Rodríguez-Sánchez, A.; et al. The Effect of Influent Characteristics and Operational Conditions over the Performance and Microbial Community Structure of Partial Nitritation Reactors. Water, 6(7): 1905-1924 (2014). [http://hdl.handle.net/10481/32895] 2073-4441 http://hdl.handle.net/10481/32895 10.3390/w6071905 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ info:eu-repo/semantics/openAccess Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License MDPI