02119naa a2200301 a 450000100080000000500110000800800410001902400330006010000160009324501540010926000090026352012450027265000120151765000200152965000100154965000250155965000210158465000110160565000220161665000170163865300220165570000130167770000190169070000230170970000120173270000180174477300550176221137782019-11-01       2019    bl uuuu     u00u1 u    #d7 a10.4136/ambi-agua.2241.2DOI1 aBORTOLI, M.  aSimultaneous removal of nitrogen and organic carbon from swine wastewater using the pre-denitrification/nitrification process.h[electronic resource]  c2019  aAbstract: Wastewater from confined animal feeding operations (CAFOs) can interfere significantly with the natural nitrogen and phosphorus balance in the environment if not treated adequately prior to disposal. In this work, a modified Lutzak-Ettinger (MLE) consisting of sequential predenitrification/ nitrification was used to determine the effects of nutrient loading rates and hydraulic retention times (HRT) on total nitrogen (TN) and organic carbon (TOC) removal from swine wastewater. MLE reactor was continuously fed swine wastewater for over 205 days using different recycle ratios (Rr) and HRT. Higher TN and TOC removal efficiencies (90.7% and 96.1%, respectively) were obtained when recycling effluent from the nitrification tank (4.5:1) combined with effluent from the final clarifier (1:1). Removal efficiencies of 96% for TOC and 90% for TN were obtained for the maximum loading rates of 0.56 gTN L-1d-1 and 2.15 g TOC L-1d-1, respectively. TN and TOC removal rates were achieved with HRT in as little as 3.5 days. Overall, MLE was a robust bioprocess withstanding variations in wastewater physical-chemical composition and/or changes in operational conditions without significant impairment of N and TOC removal efficiencies.  aAmmonia  aDenitrification  aSwine  aWastewater treatment  aÁguas Residuais  aDejeto  aDesnitrificação  aSuinocultura  aHigh organic rate1 aKUNZ, A.1 aPRÁ, M. C. de1 aSILVA, M. L. B. da1 aCÉ, A.1 aSOARES, H. M.  tRevista Ambiente & Águagv.14, n. 2, e2241, 2019.