Decolorization of molasses wastewater by a strain No.BP103 of acetogenic bacteria
2003; Elsevier BV; Volume: 92; Issue: 1 Linguagem: Inglês
10.1016/j.biortech.2003.07.010
ISSN1873-2976
AutoresSuntud Sirianuntapiboon, P. Phothilangka, Sadahiro Ohmomo,
Tópico(s)Enzyme Production and Characterization
ResumoAmong 170 strains of acetogenic bacteria, a strain No.BP103 showed the highest decolorization yield (76.4 ± 3.2%) when cultivated at 30 °C for 5 days in molasses pigments medium containing glucose 3.0%, yeast extract 0.5%, KH2PO4 0.1% and MgSO4 · 7H2O 0.05% and the pH adjusted to 6.0. In addition this strain could decolorize 32.3 ± 3.2% and 73.5 ± 3.5% of molasses pigments in stillage and anaerobically treated molasses wastewater, both supplementing glucose 3.0%, yeast extract 0.5%, KH2PO4 0.1% and MgSO4 · 7H2O 0.05%. However without nutrients supplement, the decolorization yields were 9.75 ± 3.0% and 44.36 ± 3.4%, respectively. In a replacement culture system involving six times replacement (30 days), the strain No.BP103 showed a constant decolorization yield of 72.0 ± 3.2–84.0 ± 3.2% and caused decreases of biological oxygen demand and chemical oxygen demand values of approximately 58.5 ± 6.4–82.2 ± 7.1% and 35.5 ± 0.42–71.20.58%, respectively. Under a periodical feeding system, the decolorization yield was 30.0 ± 2.1–45.0 ± 3.5%.
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