Artigo Revisado por pares

Fate of organic carbon in UAFB treating raw sewage: Impact of moderate to low temperature

2010; Elsevier BV; Volume: 102; Issue: 3 Linguagem: Inglês

10.1016/j.biortech.2010.10.029

ISSN

1873-2976

Autores

Dawen Gao, Yu Tao, Rui An, Yuan Fu, Nanqi Ren,

Tópico(s)

Microbial bioremediation and biosurfactants

Resumo

The anaerobic biological treatment of raw sewage under low ambient temperatures was investigated in an up-flow anaerobic fixed bed (UAFB) reactor, over a 220-day trial period. The operating temperature was lowered stepwisely from 35 to 25, 20 and 15 °C. Obvious accumulation of acetic acid was observed in the effluent as the temperature dropped, which almost tripled at 15 °C compared to that at 35 °C. An interesting psychrophilic-forward-shift trend of methane production rate following the decrease of temperature was discovered. The methane yield at each trial was 169, 201, 256 and 269 LSTP CH4/kg CODremoved. For each temperature trial, about 32.6%, 28.3%, 34.4% and 34.9% were removed in form of methane. Based on PCR-DGGE results, the band corresponded to Methanosphaera spp. only showed up on 15 °C profile. Analysis of both methane production and DGGE results indicated that psychro-tolerant microorganisms dominated the archaeal populations in the UAFB under low-temperature.

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