Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2111
Título: Biodegradation rate constants in different NF/UF fractions of cork processing wastewaters
Autor: Bernardo, Marisa
Santos, Ana
Cantinho, Paula
Minhalma, Miguel
Palavras-chave: Cork Processing Wastewater
Fractionation
Membranes
Biochemical Oxygen Demand
Biodegradation Rate Constant
Bod
Ultrafiltration
Data: Mai-2011
Editora: Desalination Publ
Citação: BERNARDO, Marisa; SANTOS, Ana; CANTINHO, Paula; MINHALMA, Miguel - Biodegradation rate constants in different NF/UF fractions of cork processing wastewaters. Desalination and Water Treatment. ISSN 1944-3994. Vol. 29, nº 1-3 (2011) p. 264-270.
Resumo: Cork processing wastewater is an aqueous complex mixture of organic compounds that have been extracted from cork planks during the boiling process. These compounds, such as polysaccharides and polyphenols, have different biodegradability rates, which depend not only on the natureof the compound but also on the size of the compound. The aim of this study is to determine the biochemical oxygen demands (BOD) and biodegradationrate constants (k) for different cork wastewater fractions with different organic matter characteristics. These wastewater fractions were obtained using membrane separation processes, namely nanofiltration (NF) and ultrafiltration (UF). The nanofiltration and ultrafiltration membranes molecular weight cut-offs (MWCO) ranged from 0.125 to 91 kDa. The results obtained showed that the biodegradation rate constant for the cork processing wastewater was around 0.3 d(-1) and the k values for the permeates varied between 0.27-0.72 d(-1), being the lower values observed for permeates generated by the membranes with higher MWCO and the higher values observed for the permeates generated by the membranes with lower MWCO. These higher k values indicate that the biodegradable organic matter that is permeated by the membranes with tighter MWCO is more readily biodegradated.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2111
ISSN: 1944-3994
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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