Artigo Revisado por pares

Effect of oxygen concentration on biological nitrification and microbial kinetics in a cross-flow membrane bioreactor (MBR) and moving-bed biofilm reactor (MBBR) treating old landfill leachate

2006; Elsevier BV; Volume: 286; Issue: 1-2 Linguagem: Inglês

10.1016/j.memsci.2006.09.044

ISSN

1873-3123

Autores

Roberto Canziani, Valeria Emondi, M. Garavaglia, Francesca Malpei, Eleonora Pasinetti, Gianluigi Buttiglieri,

Tópico(s)

Microbial Fuel Cells and Bioremediation

Resumo

Ammonium nitrogen concentration in leachate from old Italian landfills ranges from 0.5 to as high as 3 g L−1. In this paper biological nitrogen removal from leachate has been achieved by partial nitrification to nitrite in a pure-oxygen membrane bioreactor (PO-MBR) and by subsequent denitrification in a moving-bed biofilm reactor (MBBR). When ammonium is biologically oxidized to nitrite, only 75% of the oxygen required for full nitrification is needed. Moreover, denitrification can be performed by saving 30–40% of the carbon required. The process was carried out by an MBR oxidation tank of 500 L equipped with an UF ceramic membrane followed by a 540-L post-denitrification tank filled with moving plastic support media. The best operational conditions to achieve partial nitrification were analyzed. TKN loading rate was variable from 50 to 120 g TKN (kg TSS day)−1 with an influent ammonia concentration between 1000 and 1500 mg L−1. When DO concentration in the MBR was kept in the range 0.2–0.5 mg L−1, 90% oxidation of ammonia to nitrite was achieved, with stable inhibition of nitrite-oxidizing bacteria even at sludge retention time higher than 45 days.

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