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Title: Soluble Microbial Product (SMP) characterization in bench-scale aerobic and anaerobic CSTRS under different operational conditions.
Authors: Mesquita, Patrícia da Luz
Aquino, Sergio Francisco de
Xavier, Amália Luísa Pedrosa
Silva, Júlio César Cardoso da
Afonso, Robson José de Cássia Franco
Issue Date: 2010
Citation: MESQUITA, P. da L. et al. Soluble Microbial Product (SMP) characterization in bench-scale aerobic and anaerobic CSTRS under different operational conditions. Brazilian Journal of Chemical Engineering, v. 27, p. 101-111, 2010. Disponível em: <>. Acesso em: 21 out. 2015.
Abstract: This work presents results on the production and characterization (by both mass spectrometry and conventional chemical analyses) of Soluble Microbial Products (SMP) that accumulated in aerobic and anaerobic bench scale completely stirred tank reactors (CSTRs) fed with glucose or acetate under different hydraulic retention times (HRT) and temperatures. SMP accumulation varied from 2 to 68% of the influent COD in the aerobic reactor and from 9 to 27% in the anaerobic reactor and increased with the decrease in temperature and with the HRT reduction in the aerobic reactor. On the other hand, in the anaerobic reactor, the organic loading rate and the temperature had little impact on SMP production, implying that the SMP originated from different mechanisms in each system. For both reactors, a higher accumulation of SMPs was observed as the substrate was acetate when compared to glucose, and the chemical analysis showed that the majority of the SMP did not seem to be proteins or carbohydrates. Principal component analysis (PCA) of the mass spectra from positive and negative mode electron-spray ionization (LC-IT-TOF-MS) and results from matrix assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS) confirmed the chemical analyses and showed the absence of proteins in the effluents and the predominance of low molecular weight SMP. The PCA analysis also showed that the majority of the SMP from aerobic and anaerobic reactors did not seem to originate from soluble extracellular polymeric substances (EPS) or cell lysis products. Keywords: Biological wastewater treatment; Soluble microbial products; Residual COD; Volatile fatty acids; mass spectrometry
ISSN: 0104-6632
metadata.dc.rights.license: Todo o conteúdo do periódico Brazilian Journal of Chemical Engineering, exceto onde identificado, está sob uma licença Creative Commons que permite copiar, distribuir e transmitir o trabalho em qualquer suporte ou formato desde que sejam citados o autor e o licenciante. Não permite o uso para fins comerciais. Fonte: Brazilian Journal of Chemical Engineering <>. Acesso em: 20 ago. 2019.
Appears in Collections:DECBI - Artigos publicados em periódicos

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