Produção Nacional
Revisado por pares
Long-term effect of acid and heat pretreatment of sludge from a sugarcane vinasse treatment plant on the microbial community and on thermophilic biohydrogen production
2015; Elsevier BV; Volume: 40; Issue: 41 Linguagem: Inglês
10.1016/j.ijhydene.2015.08.096
ISSN1879-3487
AutoresFranciele do Carmo Lamaison, Pedro Avelino Maia de Andrade, Ademir Durrer Bigaton, Fernando Dini Andreote, Regina Vasconcellos António, Valéria Reginatto,
Tópico(s)Wastewater Treatment and Nitrogen Removal
ResumoThis work investigated how heat and acid pretreatment affected thermophilic biohydrogen production by a mixed culture present in the sludge of a sugarcane vinasse treatment plant. Heat- (80 °C for 15 min) or acid- (pH 3 for 24 h) treated sludge samples were employed to seed batch bioreactors along 36 days. The heat- and acid-treated sludge samples afforded H2 production rates (HPRs) of 8.4 and 9.5 mmol/L.d, respectively. The lactic acid concentration increased in the bioreactor seeded with heat-treated sludge, whilst the lactic acid concentration diminished in the bioreactor inoculated with the acid-treated sludge. Identification of the microbial community revealed that Clostridiaceae predominated in all the sludge samples. The most abundant Clostridiaceae in the heat- and acid-treated sludge samples were Clostridium and Thermoanaerobacterium, respectively. Acid pretreatment modified the microbial community and enhanced consumption of lactic acid, a metabolite that is normally associated with decreased H2 production.
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