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Anammox for nitrogen removal from anaerobically pre-treated municipal wastewater: Effect of COD/N ratios on process performance and bacterial community structure

2016; Elsevier BV; Volume: 211; Linguagem: Inglês

10.1016/j.biortech.2016.03.107

1873-2976

Cíntia Dutra Leal, Alyne Duarte Pereira, Fernando Terra Nunes, Luísa Ornelas Ferreira, Aline Carolina Cirilo Coelho, Sarah Kinaip Bicalho, E. F. A. Mac Conell, Thiago Bressani Ribeiro, Carlos Augusto de Lemos Chernicharo, Juliana Calábria de Araújo,

Microbial Fuel Cells and Bioremediation

Long-term effects of COD/N ratios on the nitrogen removal performance and bacterial community of an anammox reactor were evaluated by adding a synthetic medium (with glucose) and real anaerobic effluent to a SBR. At a COD/N ratio of 2.8 (COD, 390 mg·L−1) ammonium removal efficiency was 66%, while nitrite removal remained high (99%). However, at a COD/N ratio of 5.0 (COD, 300 mg·L−1), ammonium and nitrite removal efficiencies were high (84% and 99%, respectively). High COD, nitrite, and ammonium removal efficiencies (80%, 90% and 95%, respectively) were obtained on adding anaerobically pre-treated municipal wastewater (with nitrite) to the reactor. DGGE revealed that the addition of anaerobic effluent changed the bacterial community structure and selected for DNA sequences related to Brocadia sinica and Chloroflexi. Adding glucose and anaerobic effluent increased denitrifiers concentration threefold. Thus, the possibility of using the anammox process to remove nitrogen from anaerobically pre-treated municipal wastewater was demonstrated.